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Qianlai Zhuang - One of the best experts on this subject based on the ideXlab platform.
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Focus on the impact of climate change on wetland ecosystems and Carbon Dynamics
Environmental Research Letters, 2016Co-Authors: Lei Meng, Qianlai Zhuang, Nigel T. Roulet, Torben R. Christensen, Stephen E. FrolkingAbstract:The renewed growth in atmospheric methane (CH4) since 2007 after a decade of stabilization has drawn much attention to its causes and future trends. Wetlands are the single largest source of atmospheric CH4. Understanding wetland ecosystems and Carbon Dynamics is critical to the estimation of global CH4 and Carbon budgets. After approximately 7 years of CH4 related research following the renewed growth in atmospheric CH4, Environmental Research Letters launched a special issue of research letters on wetland ecosystems and Carbon Dynamics in 2014. This special issue highlights recent developments in terrestrial ecosystem models and field measurements of Carbon fluxes across different types of wetland ecosystems. The 14 research letters emphasize the importance of wetland ecosystems in the global CO2 and CH4 budget.
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Quantifying spatially and temporally explicit CO2 fertilization effects on global terrestrial ecosystem Carbon Dynamics
Ecosphere, 2016Co-Authors: Shaoqing Liu, Qianlai Zhuang, Min ChenAbstract:Current terrestrial ecosystem models are usually driven with global average annual atmospheric Carbon dioxide (CO2) concentration data at the global scale. However, high-precision CO2 measurement from eddy flux towers showed that seasonal, spatial surface atmospheric CO2 concentration differences were as large as 35 ppmv and the site-level tests indicated that the CO2 variation exhibited different effects on plant photosynthesis. Here we used a process-based ecosystem model driven with two spatially and temporally explicit CO2 data sets to analyze the atmospheric CO2 fertilization effects on the global Carbon Dynamics of terrestrial ecosystems from 2003 to 2010. Our results demonstrated that CO2 seasonal variation had a negative effect on plant Carbon assimilation, while CO2 spatial variation exhibited a positive impact. When both CO2 seasonal and spatial effects were considered, global gross primary production and net ecosystem production were 1.7 Pg C·yr−1 and 0.08 Pg C·yr−1 higher than the simulation using uniformly distributed CO2 data set and the difference was significant in tropical and temperate evergreen broadleaf forest regions. This study suggests that the CO2 observation network should be expanded so that the realistic CO2 variation can be incorporated into the land surface models to adequately account for CO2 fertilization effects on global terrestrial ecosystem Carbon Dynamics.
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Evaluating aerosol direct radiative effects on global terrestrial ecosystem Carbon Dynamics from 2003 to 2010
Tellus B: Chemical and Physical Meteorology, 2014Co-Authors: Min Chen, Qianlai ZhuangAbstract:An integrated terrestrial ecosystem model and an atmospheric radiative transfer module are developed and applied to evaluate aerosol direct radiative effects on Carbon Dynamics of global terrestrial ecosystems during 2003–2010. The Moderate-Resolution Imaging Spectroradiometer measurements of key atmosphere parameters have been used to quantify aerosol effects on downward solar radiation. Simulations with and without considering the aerosol loadings show that aerosol affects terrestrial ecosystem Carbon Dynamics through the effects on plant phenology, thermal and hydrological conditions as well as solar radiation. The simulations also show that aerosol enhances the terrestrial gross primary production by 4.9 Pg C yr −1 , the net primary production by 3.8 Pg C yr −1 , the net ecosystem production by 3.9 Pg C yr −1 , and the plant respiration by 1.1 Pg C yr −1 during the period. The aerosol loading at a magnitude of 0.1 Pg C yr − 1 reduces ecosystem heterotrophic respiration. These results support previous findings of the positive effects of aerosol light scattering on plant production, but suggest there is a strong spatial variation due to cloud cover. This study suggests that both direct and indirect aerosol radiative effects through aerosol–cloud interactions should be considered to quantify the global Carbon cycle. Keywords: aerosol, Carbon Dynamics, terrestrial ecosystem model (Published: 22 May 2014) Citation: Tellus B 2014, 66 , 21808, http://dx.doi.org/10.3402/tellusb.v66.21808
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Influences of calibration data length and data period on model parameterization and quantification of terrestrial ecosystem Carbon Dynamics
Geoscientific Model Development Discussions, 2013Co-Authors: Qianlai ZhuangAbstract:Abstract. Reliability of terrestrial ecosystem models highly depends on the quantity and quality of the data that have been used to calibrate the models. Nowadays, in situ observations of Carbon fluxes are abundant. However, the knowledge of how much data (data length) and which subset of the time series data (data period) should be used to effectively calibrate the model is still lacking. In this study we use the AmeriFlux Carbon flux data to parameterize the Terrestrial Ecosystem Model (TEM) using an adjoint based data assimilation technique for five different ecosystem types including deciduous broadleaf forest, coniferous forest, grassland, shrubland and boreal forest. We hypothesize that calibration data covering various climate conditions for the ecosystems (e.g. drought and wet; high and low air temperature) can reduce the uncertainty of the model parameter space. Here parameterization is conducted to explore the impact of both data length and data period on the uncertainty reduction of the posterior model parameters and the quantification of site and regional Carbon Dynamics. We find that: (1) the model is better constrained when it uses two-year data comparing to using one-year data. Further, two-year data is long enough in calibrating TEM's Carbon Dynamics, since using three-year data could only marginally improve the model performance at our study sites; (2) the model is better constrained with the data that have a higher "climate variability" than that with a lower one. The climate variability is used to measure the overall possibility of the ecosystem to experience various climate conditions including drought and extreme air temperatures and radiation; (3) the US regional simulations indicate that the effect of calibration data length on Carbon Dynamics is amplified at regional and temporal scales, leading to large discrepancies among different parameterization experiments, especially in July and August. This study shall help the eddy flux observation community in conducting field observations. The study shall also benefit the ecosystem modeling community in using multiple-year data to improve model parameterization and predictability.
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Modeling temperature acclimation effects on Carbon Dynamics of forest ecosystems in the conterminous United States
Tellus B: Chemical and Physical Meteorology, 2013Co-Authors: Min Chen, Qianlai ZhuangAbstract:The projected rise in temperature in the 21st century will alter forest ecosystem functioning and Carbon Dynamics. To date, the acclimation of plant photosynthesis to rising temperature has not been adequately considered in earth system models. Here we present a study on regional ecosystem Carbon Dynamics under future climate scenarios incorporating temperature acclimation effects into a large-scale ecosystem model, the terrestrial ecosystem model (TEM). We first incorporate a general formulation of the temperature acclimation of plant photosynthesis into TEM, and then apply the revised model to the forest ecosystems of the conterminous United States for the 21st century under the future Intergovernmental Panel on Climate Change (IPCC) Special Report on Emissions Scenarios (SRES) climate scenarios A1FI, A2, B1 and B2. We find that there are significant differences between the estimates of Carbon Dynamics from the previous and the revised models. The largest differences occur under the A1FI scenario, in which the model that considers acclimation effects predicts that the region will act as a Carbon sink, and that cumulative Carbon in the 21st century will be 35 Pg C higher than the estimates from the model that does not consider acclimation effects. Our results further indicate that in the region there are spatially different responses to temperature acclimation effects. This study suggests that terrestrial ecosystem models should take temperature acclimation effects into account so as to more accurately quantify ecosystem Carbon Dynamics at regional scales
A D Mcguire - One of the best experts on this subject based on the ideXlab platform.
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The role of historical fire disturbance in the Carbon Dynamics of the pan-boreal region: A process-based analysis
Journal of Geophysical Research, 2007Co-Authors: M. S. Balshi, David W Kicklighter, A D Mcguire, Q. Zhuang, J. Melillo, E. Kasischke, C. Wirth, M. Flannigan, J. Harden, Joy S CleinAbstract:[1] Wildfire is a common occurrence in ecosystems of northern high latitudes, and changes in the fire regime of this region have consequences for Carbon feedbacks to the climate system. To improve our understanding of how wildfire influences Carbon Dynamics of this region, we used the process-based Terrestrial Ecosystem Model to simulate fire emissions and changes in Carbon storage north of 45 degrees N from the start of spatially explicit historically recorded fire records in the twentieth century through 2002, and evaluated the role of fire in the Carbon Dynamics of the region within the context of ecosystem responses to changes in atmospheric CO2 concentration and climate. Our analysis indicates that fire plays an important role in interannual and decadal scale variation of source/sink relationships of northern terrestrial ecosystems and also suggests that atmospheric CO2 may be important to consider in addition to changes in climate and fire disturbance. There are substantial uncertainties in the effects of fire on Carbon storage in our simulations. These uncertainties are associated with sparse fire data for northern Eurasia, uncertainty in estimating Carbon consumption, and difficulty in verifying assumptions about the representation of fires that occurred prior to the start of the historical fire record. To improve the ability to better predict how fire will influence Carbon storage of this region in the future, new analyses of the retrospective role of fire in the Carbon Dynamics of northern high latitudes should address these uncertainties
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the role of historical fire disturbance in the Carbon Dynamics of the pan boreal region a process based analysis
Journal of Geophysical Research, 2007Co-Authors: M. S. Balshi, David W Kicklighter, A D Mcguire, Qianlai Zhuang, Christian Wirth, E. Kasischke, M. Flannigan, Jerry M Melillo, Jennifer W Harden, Joy S CleinAbstract:[1] Wildfire is a common occurrence in ecosystems of northern high latitudes, and changes in the fire regime of this region have consequences for Carbon feedbacks to the climate system. To improve our understanding of how wildfire influences Carbon Dynamics of this region, we used the process-based Terrestrial Ecosystem Model to simulate fire emissions and changes in Carbon storage north of 45°N from the start of spatially explicit historically recorded fire records in the twentieth century through 2002, and evaluated the role of fire in the Carbon Dynamics of the region within the context of ecosystem responses to changes in atmospheric CO2 concentration and climate. Our analysis indicates that fire plays an important role in interannual and decadal scale variation of source/sink relationships of northern terrestrial ecosystems and also suggests that atmospheric CO2 may be important to consider in addition to changes in climate and fire disturbance. There are substantial uncertainties in the effects of fire on Carbon storage in our simulations. These uncertainties are associated with sparse fire data for northern Eurasia, uncertainty in estimating Carbon consumption, and difficulty in verifying assumptions about the representation of fires that occurred prior to the start of the historical fire record. To improve the ability to better predict how fire will influence Carbon storage of this region in the future, new analyses of the retrospective role of fire in the Carbon Dynamics of northern high latitudes should address these uncertainties.
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environmental variation vegetation distribution Carbon Dynamics and water energy exchange at high latitudes
Journal of Vegetation Science, 2002Co-Authors: A D Mcguire, Jason Beringer, Joy S Clein, Jagtar S Bhatti, David W Kicklighter, Michael J Apps, Christian Wirth, Howard E Epstein, F. S. Chapin, B De GrootAbstract:The responses of high latitude ecosystems to global change involve complex interactions among environmental variables, vegetation distribution, Carbon Dynamics, and water and energy exchange. These responses may have important consequences for the earth system. In this study, we evaluated how vegetation distribution, Carbon stocks and turnover, and water and energy exchange are related to environmental variation spanned by the network of the IGBP high latitude transects. While the most notable feature of the high latitude transects is that they generally span temperature gradients from southern to northern latitudes, there are substantial differences in temperature among the transects. Also, along each transect temperature co-varies with precipitation and photosynthetically active radiation, which are also variable among the transects. Both climate and disturbance interact to influence latitudinal patterns of vegetation and soil Carbon storage among the transects, and vegetation distribution appears to interact with climate to determine exchanges of heat and moisture in high latitudes. Despite limitations imposed by the data we assembled, the analyses in this study have taken an important step toward clarifying the complexity of interactions among environmental variables, vegetation distribution, Carbon stocks and turnover, and water and energy exchange in high latitude regions. This study reveals the need to conduct coordinated global change studies in high latitudes to further elucidate how interactions among climate, disturbance, and vegetation distribution influence Carbon Dynamics and water and energy exchange in high latitudes.
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Environmental variation, vegetation distribution, Carbon Dynamics and water/energy exchange at high latitudes
Journal of Vegetation Science, 2002Co-Authors: A D Mcguire, Jason Beringer, Joy S Clein, Jagtar S Bhatti, David W Kicklighter, Michael J Apps, Christian Wirth, Howard E Epstein, F. S. Chapin, B De GrootAbstract:The responses of high latitude ecosystems to global change involve complex interactions among environmental variables, vegetation distribution, Carbon Dynamics, and water and energy exchange. These responses may have important consequences for the earth system. In this study, we evaluated how vegetation distribution, Carbon stocks and turnover, and water and energy exchange are related to environmental variation spanned by the network of the IGBP high latitude transects. While the most notable feature of the high latitude transects is that they generally span temperature gradients from southern to northern latitudes, there are substantial differences in temperature among the transects. Also, along each transect temperature co-varies with precipitation and photosynthetically active radiation, which are also variable among the transects. Both climate and disturbance interact to influence latitudinal patterns of vegetation and soil Carbon storage among the transects, and vegetation distribution appears to interact with climate to determine exchanges of heat and moisture in high latitudes. Despite limitations imposed by the data we assembled, the analyses in this study have taken an important step toward clarifying the complexity of interactions among environmental variables, vegetation distribution, Carbon stocks and turnover, and water and energy exchange in high latitude regions. This study reveals the need to conduct coordinated global change studies in high latitudes to further elucidate how interactions among climate, disturbance, and vegetation distribution influence Carbon Dynamics and water and energy exchange in high latitudes
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Modeling soil thermal and Carbon Dynamics of a fire chronosequence in interior Alaska
Journal of Geophysical Research, 2002Co-Authors: Qianlai Zhuang, A D Mcguire, Jennifer W Harden, Katherine P. O’neill, Vladimir E. Romanovsky, John YarieAbstract:[1] In this study, the Dynamics of soil thermal, hydrologic, and ecosystem processes were coupled to project how the Carbon budgets of boreal forests will respond to changes in atmospheric CO2, climate, and fire disturbance. The ability of the model to simulate gross primary production and ecosystem respiration was verified for a mature black spruce ecosystem in Canada, the age-dependent pattern of the simulated vegetation Carbon was verified with inventory data on aboveground growth of Alaskan black spruce forests, and the model was applied to a postfire chronosequence in interior Alaska. The comparison between the simulated soil temperature and field-based estimates during the growing season (May to September) of 1997 revealed that the model was able to accurately simulate monthly temperatures at 10 cm (R > 0.93) for control and burned stands of the fire chronosequence. Similarly, the simulated and field-based estimates of soil respiration for control and burned stands were correlated (R = 0.84 and 0.74 for control and burned stands, respectively). The simulated and observed decadal to centuryscale Dynamics of soil temperature and Carbon Dynamics, which are represented by mean monthly values of these variables during the growing season, were correlated among stands (R = 0.93 and 0.71 for soil temperature at 20- and 10-cm depths, R = 0.95 and 0.91 for soil respiration and soil Carbon, respectively). Sensitivity analyses indicate that along with differences in fire and climate history a number of other factors influence the response of Carbon Dynamics to fire disturbance. These factors include nitrogen fixation, the growth of moss, changes in the depth of the organic layer, soil drainage, and fire severity. INDEX TERMS: 1615 Global Change: Biogeochemical processes (4805); 0315 Atmospheric Composition and Structure: Biosphere/atmosphere interactions; 0330 Atmospheric Composition and Structure: Geochemical cycles; KEYWORDS: Carbon, fire, nitrogen, hydrology, permafrost
B De Groot - One of the best experts on this subject based on the ideXlab platform.
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environmental variation vegetation distribution Carbon Dynamics and water energy exchange at high latitudes
Journal of Vegetation Science, 2002Co-Authors: A D Mcguire, Jason Beringer, Joy S Clein, Jagtar S Bhatti, David W Kicklighter, Michael J Apps, Christian Wirth, Howard E Epstein, F. S. Chapin, B De GrootAbstract:The responses of high latitude ecosystems to global change involve complex interactions among environmental variables, vegetation distribution, Carbon Dynamics, and water and energy exchange. These responses may have important consequences for the earth system. In this study, we evaluated how vegetation distribution, Carbon stocks and turnover, and water and energy exchange are related to environmental variation spanned by the network of the IGBP high latitude transects. While the most notable feature of the high latitude transects is that they generally span temperature gradients from southern to northern latitudes, there are substantial differences in temperature among the transects. Also, along each transect temperature co-varies with precipitation and photosynthetically active radiation, which are also variable among the transects. Both climate and disturbance interact to influence latitudinal patterns of vegetation and soil Carbon storage among the transects, and vegetation distribution appears to interact with climate to determine exchanges of heat and moisture in high latitudes. Despite limitations imposed by the data we assembled, the analyses in this study have taken an important step toward clarifying the complexity of interactions among environmental variables, vegetation distribution, Carbon stocks and turnover, and water and energy exchange in high latitude regions. This study reveals the need to conduct coordinated global change studies in high latitudes to further elucidate how interactions among climate, disturbance, and vegetation distribution influence Carbon Dynamics and water and energy exchange in high latitudes.
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Environmental variation, vegetation distribution, Carbon Dynamics and water/energy exchange at high latitudes
Journal of Vegetation Science, 2002Co-Authors: A D Mcguire, Jason Beringer, Joy S Clein, Jagtar S Bhatti, David W Kicklighter, Michael J Apps, Christian Wirth, Howard E Epstein, F. S. Chapin, B De GrootAbstract:The responses of high latitude ecosystems to global change involve complex interactions among environmental variables, vegetation distribution, Carbon Dynamics, and water and energy exchange. These responses may have important consequences for the earth system. In this study, we evaluated how vegetation distribution, Carbon stocks and turnover, and water and energy exchange are related to environmental variation spanned by the network of the IGBP high latitude transects. While the most notable feature of the high latitude transects is that they generally span temperature gradients from southern to northern latitudes, there are substantial differences in temperature among the transects. Also, along each transect temperature co-varies with precipitation and photosynthetically active radiation, which are also variable among the transects. Both climate and disturbance interact to influence latitudinal patterns of vegetation and soil Carbon storage among the transects, and vegetation distribution appears to interact with climate to determine exchanges of heat and moisture in high latitudes. Despite limitations imposed by the data we assembled, the analyses in this study have taken an important step toward clarifying the complexity of interactions among environmental variables, vegetation distribution, Carbon stocks and turnover, and water and energy exchange in high latitude regions. This study reveals the need to conduct coordinated global change studies in high latitudes to further elucidate how interactions among climate, disturbance, and vegetation distribution influence Carbon Dynamics and water and energy exchange in high latitudes
Laurent Saint-andré - One of the best experts on this subject based on the ideXlab platform.
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Modeling soil organic Carbon Dynamics in temperate forests with Yasso07
Biogeosciences, 2019Co-Authors: Zhun Mao, Delphine Derrien, Markus Didion, Thomas Eglin, M. Nicolas, Mathieu Jonard, Jari Liski, Laurent Saint-andréAbstract:In a context of global changes, modeling and predicting the Dynamics of soil Carbon stocks (CSs) in forest ecosystems are vital but challenging. Yasso07 is considered to be one of the most promising models for such a purpose. We examine the accuracy of its prediction of soil Carbon Dynamics over the whole French metropolitan territory at a de-cennial timescale. We used data from 101 sites in the RENECOFOR network , which encompasses most of the French temperate forests. These data include (i) the quantity of above-ground litterfall from 1994 to 2008, measured yearly, and (ii) the soil CSs measured twice at an interval of approximately 15 years (once in the early 1990s and around 2010). We used Yasso07 to simulate the annual changes in Carbon stocks (ACCs; in tC ha −1 yr −1) for each site and then compared the estimates with actual recorded data. We carried out meta-analyses to reveal the variability in litter biochemistry in different tree organs for conifers and broadleaves. We also performed sensitivity analyses to explore Yasso07's sensitivity to annual litter inputs and model initialization settings. At the national level, the simulated ACCs (+0.00 ± 0.07 tC ha −1 yr −1 , mean ± SE) were of the same order of magnitude as the observed ones (+0.34±0.06 tC ha −1 yr −1). However, the correlation between predicted and measured ACCs remained weak (R 2
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Modeling soil organic Carbon Dynamics in temperate forests using Yasso07
2016Co-Authors: Zhun Mao, Delphine Derrien, Markus Didion, L. Liski, Thomas Eglin, M. Nicolas, Mathieu Jonard, Laurent Saint-andréAbstract:Modeling soil organic Carbon Dynamics in temperate forests using Yasso07. EcoSummit 2016 Ecological Sustainability: Engineering Change
Min Chen - One of the best experts on this subject based on the ideXlab platform.
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Quantifying spatially and temporally explicit CO2 fertilization effects on global terrestrial ecosystem Carbon Dynamics
Ecosphere, 2016Co-Authors: Shaoqing Liu, Qianlai Zhuang, Min ChenAbstract:Current terrestrial ecosystem models are usually driven with global average annual atmospheric Carbon dioxide (CO2) concentration data at the global scale. However, high-precision CO2 measurement from eddy flux towers showed that seasonal, spatial surface atmospheric CO2 concentration differences were as large as 35 ppmv and the site-level tests indicated that the CO2 variation exhibited different effects on plant photosynthesis. Here we used a process-based ecosystem model driven with two spatially and temporally explicit CO2 data sets to analyze the atmospheric CO2 fertilization effects on the global Carbon Dynamics of terrestrial ecosystems from 2003 to 2010. Our results demonstrated that CO2 seasonal variation had a negative effect on plant Carbon assimilation, while CO2 spatial variation exhibited a positive impact. When both CO2 seasonal and spatial effects were considered, global gross primary production and net ecosystem production were 1.7 Pg C·yr−1 and 0.08 Pg C·yr−1 higher than the simulation using uniformly distributed CO2 data set and the difference was significant in tropical and temperate evergreen broadleaf forest regions. This study suggests that the CO2 observation network should be expanded so that the realistic CO2 variation can be incorporated into the land surface models to adequately account for CO2 fertilization effects on global terrestrial ecosystem Carbon Dynamics.
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Evaluating aerosol direct radiative effects on global terrestrial ecosystem Carbon Dynamics from 2003 to 2010
Tellus B: Chemical and Physical Meteorology, 2014Co-Authors: Min Chen, Qianlai ZhuangAbstract:An integrated terrestrial ecosystem model and an atmospheric radiative transfer module are developed and applied to evaluate aerosol direct radiative effects on Carbon Dynamics of global terrestrial ecosystems during 2003–2010. The Moderate-Resolution Imaging Spectroradiometer measurements of key atmosphere parameters have been used to quantify aerosol effects on downward solar radiation. Simulations with and without considering the aerosol loadings show that aerosol affects terrestrial ecosystem Carbon Dynamics through the effects on plant phenology, thermal and hydrological conditions as well as solar radiation. The simulations also show that aerosol enhances the terrestrial gross primary production by 4.9 Pg C yr −1 , the net primary production by 3.8 Pg C yr −1 , the net ecosystem production by 3.9 Pg C yr −1 , and the plant respiration by 1.1 Pg C yr −1 during the period. The aerosol loading at a magnitude of 0.1 Pg C yr − 1 reduces ecosystem heterotrophic respiration. These results support previous findings of the positive effects of aerosol light scattering on plant production, but suggest there is a strong spatial variation due to cloud cover. This study suggests that both direct and indirect aerosol radiative effects through aerosol–cloud interactions should be considered to quantify the global Carbon cycle. Keywords: aerosol, Carbon Dynamics, terrestrial ecosystem model (Published: 22 May 2014) Citation: Tellus B 2014, 66 , 21808, http://dx.doi.org/10.3402/tellusb.v66.21808
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Modeling temperature acclimation effects on Carbon Dynamics of forest ecosystems in the conterminous United States
Tellus B: Chemical and Physical Meteorology, 2013Co-Authors: Min Chen, Qianlai ZhuangAbstract:The projected rise in temperature in the 21st century will alter forest ecosystem functioning and Carbon Dynamics. To date, the acclimation of plant photosynthesis to rising temperature has not been adequately considered in earth system models. Here we present a study on regional ecosystem Carbon Dynamics under future climate scenarios incorporating temperature acclimation effects into a large-scale ecosystem model, the terrestrial ecosystem model (TEM). We first incorporate a general formulation of the temperature acclimation of plant photosynthesis into TEM, and then apply the revised model to the forest ecosystems of the conterminous United States for the 21st century under the future Intergovernmental Panel on Climate Change (IPCC) Special Report on Emissions Scenarios (SRES) climate scenarios A1FI, A2, B1 and B2. We find that there are significant differences between the estimates of Carbon Dynamics from the previous and the revised models. The largest differences occur under the A1FI scenario, in which the model that considers acclimation effects predicts that the region will act as a Carbon sink, and that cumulative Carbon in the 21st century will be 35 Pg C higher than the estimates from the model that does not consider acclimation effects. Our results further indicate that in the region there are spatially different responses to temperature acclimation effects. This study suggests that terrestrial ecosystem models should take temperature acclimation effects into account so as to more accurately quantify ecosystem Carbon Dynamics at regional scales
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Spatially Explicit Parameterization of a Terrestrial Ecosystem Model and Its Application to the Quantification of Carbon Dynamics of Forest Ecosystems in the Conterminous United States
Earth Interactions, 2012Co-Authors: Min Chen, Qianlai ZhuangAbstract:AbstractThe authors use a spatially explicit parameterization method and the Terrestrial Ecosystem Model (TEM) to quantify the Carbon Dynamics of forest ecosystems in the conterminous United States. Six key parameters that govern the rates of Carbon and nitrogen Dynamics in TEM are selected for calibration. Spatially explicit data for Carbon and nitrogen pools and fluxes are used to calibrate the six key parameters to more adequately account for the spatial heterogeneity of ecosystems in estimating regional Carbon Dynamics. The authors find that a spatially explicit parameterization results in vastly different Carbon exchange rates relative to a parameterization conducted for representative ecosystem sites. The new parameterization method estimates that the net ecosystem production (NEP), the annual gross primary production (GPP), and the net primary production (NPP) of the regional forest ecosystems are 61% (0.02 Pg C; 1 Pg = 1015 g) higher and 2% (0.11 Pg C) and 19% (0.45 Pg C) lower, respectively, than...