The Experts below are selected from a list of 285 Experts worldwide ranked by ideXlab platform
L Tessier - One of the best experts on this subject based on the ideXlab platform.
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Climatic Effect of atmospheric CO2 doubling on radial tree growth in south eastern France.
Journal of Biogeography, 2003Co-Authors: T Keller, Joel Guiot, L TessierAbstract:..... .. ..... ..... .. ...... ......... ......~~~~ ... ...... .... . ..... .... ......... . . . . . . . ....... ....... ... .... .. .......
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Climatic Effect of atmospheric CO2 doubling on radial tree growth in south eastern France
Journal of Biogeography, 1997Co-Authors: T Keller, Joel Guiot, L TessierAbstract:The Climatic Effect of a doubling of atmospheric CO2 on radial growth of trees was studied in ten populations of three species in south eastern France using an Atmospheric General Circulation Model (AGCM) predicting a 3 degrees C increase of mean temperature and a light rise of precipitation. Results are based on empirical growth climate models, involving an Artificial Neural Network (ANN) technique. Only two of the studied populations, on the boundaries of their ecological area, are sensitive to the Climatic variations. One is the larch (Larix decidua Mill.) population located at 2300m on elevation (near the timberline) which shows a radial growth increase. The other is the most southern French Scots pine (Pinus sylvestris L.) population which reacts with a severe growth rate reduction.
Song Yang - One of the best experts on this subject based on the ideXlab platform.
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potential regulation on the Climatic Effect of tibetan plateau heating by tropical air sea coupling in regional models
Climate Dynamics, 2019Co-Authors: Ziqian Wang, Anmin Duan, Song YangAbstract:Based on the conventional weather research and forecasting (WRF) model and the air–sea coupled mode WRF-OMLM, we investigate the potential regulation on the Climatic Effect of Tibetan Plateau (TP) heating by the air–sea coupling over the tropical Indian Ocean and western Pacific. Results indicate that the TP heating significantly enhances the southwesterly monsoon circulation over the northern Indian Ocean and the South Asia subcontinent. The intensified southwesterly wind cools the sea surface mainly through the wind-evaporation-SST (sea surface temperature) feedback. Cold SST anomaly then weakens monsoon convective activity, especially that over the Bay of Bengal, and less water vapor is thus transported into the TP along its southern slope from the tropical oceans. As a result, summer precipitation decreases over the TP, which further weakens the TP local heat source. Finally, the changed TP heating continues to influence the summer monsoon precipitation and atmospheric circulation. To a certain extent, the air–sea coupling over the adjacent oceans may weaken the Effect of TP heating on the mean climate in summer. It is also implied that considerations of air–sea interaction are necessary in future simulation studies of the TP heating Effect.
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Potential regulation on the Climatic Effect of Tibetan Plateau heating by tropical air–sea coupling in regional models
Climate Dynamics, 2018Co-Authors: Ziqian Wang, Anmin Duan, Song YangAbstract:Based on the conventional weather research and forecasting (WRF) model and the air–sea coupled mode WRF-OMLM, we investigate the potential regulation on the Climatic Effect of Tibetan Plateau (TP) heating by the air–sea coupling over the tropical Indian Ocean and western Pacific. Results indicate that the TP heating significantly enhances the southwesterly monsoon circulation over the northern Indian Ocean and the South Asia subcontinent. The intensified southwesterly wind cools the sea surface mainly through the wind-evaporation-SST (sea surface temperature) feedback. Cold SST anomaly then weakens monsoon convective activity, especially that over the Bay of Bengal, and less water vapor is thus transported into the TP along its southern slope from the tropical oceans. As a result, summer precipitation decreases over the TP, which further weakens the TP local heat source. Finally, the changed TP heating continues to influence the summer monsoon precipitation and atmospheric circulation. To a certain extent, the air–sea coupling over the adjacent oceans may weaken the Effect of TP heating on the mean climate in summer. It is also implied that considerations of air–sea interaction are necessary in future simulation studies of the TP heating Effect.
Thierry Gauquelin - One of the best experts on this subject based on the ideXlab platform.
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Variability of eight Algerian oleaster ecotypes (Olea europaea subsp. europaea var. sylvestris [Mill.] Lehr): pollen and exine morphology in relation to geo-Climatic Effect
Grana, 2020Co-Authors: Khedidja Khouatmiani, Safia Belhadj, Alain Tonetto, Axel Assie, Jean Philippe Mevy, Thierry GauquelinAbstract:Pollen characters of the Algerian oleaster (Olea europaea subsp. europaea var. sylvestris [Mill.] Lehr) from eight ecotypes were analysed to evaluate the geo-Climatic Effect of their environment. S...
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Variability of eight Algerian oleaster ecotypes (Olea europaea subsp. europaea var. sylvestris [Mill.] Lehr): pollen and exine morphology in relation to geo-Climatic Effect
Grana, 2020Co-Authors: Khedidja Khouatmiani, Safia Belhadj, Alain Tonetto, Axel Assie, Jean Philippe Mevy, Thierry GauquelinAbstract:Pollen characters of the Algerian oleaster (Olea europaea subsp. europaea var. sylvestris [Mill.] Lehr) from eight ecotypes were analysed to evaluate the geo-Climatic Effect of their environment. Samples were collected along an altitudinal gradient from western to central Algeria. Eighteen morphological characters of the pollen grains were studied using scanning electron microscopy (SEM). The results show significant inter-populations variability. The geo-Climatic conditions, duration and timing of dry periods vary from one area to another. Depending on the area, the length of the dry period (P p ≤ 2T) coincides more or less with anthesis periods. No significant geo-Climatic Effects on exine parameters were detected, except for lumina density (LD) and mean lumina diameter (Lm). However, polar axis (P), pollen size index (PSI) and pollen colpis length (PCL) were found to be related to latitude, longitude and temperature. LD and Lm were strongly linked to the pollen parameters, resulting in variation in pollen shape and size. Depending on the geo-Climatic conditions, three morphotypes appear. The morphotype from a site with high temperature, low humidity associated with a long dry period is characterised by small pollen size, low lumina surface area and high lumina density/100 μm2 and vice versa. The results indicate that the exine has played an important role in the environmental adaption in these wild populations.
T Keller - One of the best experts on this subject based on the ideXlab platform.
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Climatic Effect of atmospheric CO2 doubling on radial tree growth in south eastern France.
Journal of Biogeography, 2003Co-Authors: T Keller, Joel Guiot, L TessierAbstract:..... .. ..... ..... .. ...... ......... ......~~~~ ... ...... .... . ..... .... ......... . . . . . . . ....... ....... ... .... .. .......
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Climatic Effect of atmospheric CO2 doubling on radial tree growth in south eastern France
Journal of Biogeography, 1997Co-Authors: T Keller, Joel Guiot, L TessierAbstract:The Climatic Effect of a doubling of atmospheric CO2 on radial growth of trees was studied in ten populations of three species in south eastern France using an Atmospheric General Circulation Model (AGCM) predicting a 3 degrees C increase of mean temperature and a light rise of precipitation. Results are based on empirical growth climate models, involving an Artificial Neural Network (ANN) technique. Only two of the studied populations, on the boundaries of their ecological area, are sensitive to the Climatic variations. One is the larch (Larix decidua Mill.) population located at 2300m on elevation (near the timberline) which shows a radial growth increase. The other is the most southern French Scots pine (Pinus sylvestris L.) population which reacts with a severe growth rate reduction.
J. P. Tang - One of the best experts on this subject based on the ideXlab platform.
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Role of sea surface temperature responses in simulation of the Climatic Effect of mineral dust aerosol
Atmospheric Chemistry and Physics, 2011Co-Authors: X. Yue, H. Liao, Huijun Wang, J. P. TangAbstract:Abstract. Mineral dust aerosol can be transported over the nearby oceans and influence the energy balance at the sea surface. The role of dust-induced sea surface temperature (SST) responses in simulations of the Climatic Effect of dust is examined by using a general circulation model with online simulation of mineral dust and a coupled mixed-layer ocean model. Both the longwave and shortwave radiative Effects of mineral dust aerosol are considered in climate simulations. The SST responses are found to be very influential on simulated dust-induced climate change, especially when climate simulations consider the two-way dust-climate coupling to account for the feedbacks. With prescribed SSTs and dust concentrations, we obtain an increase of 0.02 K in the global and annual mean surface air temperature (SAT) in response to dust radiative Effects. In contrast, when SSTs are allowed to respond to radiative forcing of dust in the presence of the dust cycle-climate interactions, we obtain a global and annual mean cooling of 0.09 K in SAT by dust. The extra cooling simulated with the SST responses can be attributed to the following two factors: (1) The negative net (shortwave plus longwave) radiative forcing of dust at the surface reduces SST, which decreases latent heat fluxes and upward transport of water vapor, resulting in less warming in the atmosphere; (2) The positive feedback between SST responses and dust cycle. The dust-induced reductions in SST lead to reductions in precipitation (or wet deposition of dust) and hence increase the global burden of small dust particles. These small particles have strong scattering Effects, which enhance the dust cooling at the surface and further reduce SSTs.
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Role of sea surface temperature responses in simulation of the Climatic Effect of mineral dust aerosol
2011Co-Authors: X. Yue, H. Liao, H. J. Wang, J. P. TangAbstract:Abstract. Mineral dust aerosol can be transported over the nearby oceans and influence the energy balance at the sea surface. The role of dust-induced sea surface temperature (SST) responses in simulations of the Climatic Effect of dust is examined by using a general circulation model with online simulation of mineral dust and a coupled mixed-layer ocean model. Both the longwave and shortwave radiative Effects of mineral dust aerosol are considered in climate simulations. The SST responses are found to be very influential on simulated dust-induced climate change, especially when climate simulations consider the two-way dust-climate coupling to account for the feedbacks. With prescribed SSTs and dust concentrations, we obtain an increase of 0.02 K in the global and annual mean surface air temperature (SAT) in response to dust radiative Effects. In contrast, when SSTs are allowed to respond to radiative forcing of dust in the presence of the dust cycle-climate interactions, we obtain a global and annual mean cooling of 0.09 K in SAT by dust. The extra cooling simulated with the SST responses can be attributed to the following two factors: (1) The negative net radiative forcing of dust at the surface reduces SST, which decreases latent heat fluxes and upward transport of water vapor, resulting in less warming in the atmosphere; (2) The positive feedback between SST responses and dust cycle. The dust-induced reductions in SST lead to reductions in precipitation (or wet deposition of dust) and hence increase the global burden of small dust particles. These small particles have strong scattering Effects, which enhance the dust cooling at the surface and further reduce SSTs.