The Experts below are selected from a list of 264 Experts worldwide ranked by ideXlab platform
S L Gong - One of the best experts on this subject based on the ideXlab platform.
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characterization of soil dust aerosol in china and its Transport and Distribution during 2001 ace asia 1 network observations
Journal of Geophysical Research, 2003Co-Authors: X Y Zhang, S L Gong, Z Shen, F M Mei, Lintao Liu, Z J Zhou, Dongfang Wang, Yaqiang Wang, Yuanyue ChengAbstract:[1] Mass loading, 20 elemental concentrations, and time series of aerosol particles were investigated over the China Dust Storm Research (ChinaDSR) observational network stations from March to May 2001 during the intensive field campaign period of ACE-Asia. Four extensive and several minor dust storm (DS) events were observed. Mass balance calculations showed that 45 - 82% of the observed aerosol mass was attributable to Asian soil dust particles among the sites, in which Ca and Fe contents are enriched to 12% and 6%, respectively, in the Western High-Dust source regions compared with dust aerosols ejected from the Northern High- Dust source regions. For the latter areas, elemental contents exhibited high Si (30%) and low Fe (4%). For all major source areas and depositional regions, aluminium (Al) comprises 7% of Asian dust. Air mass back-trajectory analysis showed that five major Transport pathways of Asian dust storms dominated dust Transport in China during spring 2001, all of which passed over Beijing. Measurements also suggest that the sand land in northeastern China is a potential source for Asian dust. The size Distribution for estimating vertical dust flux was derived from the observed surface dust size Distributions in the desert regions. For particle diameters between 0.25 and 16 mum, a lognormal Distribution was obtained from averaging observations at various deserts with a mass mean diameter of 4.5 mum and a standard deviation of 1.5. This range of soil dust constitutes about 69% of the total dust loading. The fractions for particles in the size ranges of 16 mum are around 1.7% and 30%, respectively.
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characterization of soil dust aerosol in china and its Transport and Distribution during 2001 ace asia 2 model simulation and validation
Journal of Geophysical Research, 2003Co-Authors: X Y Zhang, S L Gong, T L Zhao, Ian G Mckendry, Daniel A JaffeAbstract:[1] A size-segregated soil dust emission and Transport model, Northern Aerosol Regional Climate Model (NARCM), was used to simulate the production and Transport of Asian soil dust during the Aerosol Characterization Experiment-Asia (ACE-Asia) period from March to May 2001. The model is driven by the NCEP reanalyzed meteorology and has all the atmospheric aerosol physical processes of soil dust: production, Transport, growth, coagulation, and dry and wet deposition. A Chinese soil texture map that infers the soil grain-size Distribution with 12 categories was generated to drive the size-distributed soil dust emission scheme [Alfaro et al., 1997; Marticorena and Bergametti, 1995]. The size Distribution of vertical dust flux was derived from the observed surface dust-size Distribution in the desert regions. Parameters applicable to the Asian deserts for the dust emission scheme are assessed. Model simulations were compared with ground-based measurements in East Asia and North America and with satellite measurements for the same period of time. The model captured most of the dust mobilization episodes during this period in China and reasonably simulated the concentrations in source regions and downwind areas from East China to western North America. About 252.8 Mt of soil dust below d < 40 μm was estimated to be emitted in the East Asian deserts between 1 March and 31 May 2001 with ∼60% attributed to four major dust storms. The vertical dust loadings above 700 hPa correlate reasonably well with Total Ozone Mapping Spectrometer aerosol index (TOMS AI) observations. The sensitivity analysis of model performance to soil size Distribution, water moisture, and meteorology was carried out with the observational data to establish the most appropriate parameters and conditions for the Chinese soil dust production and Transport.
X Y Zhang - One of the best experts on this subject based on the ideXlab platform.
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characterization of soil dust aerosol in china and its Transport and Distribution during 2001 ace asia 1 network observations
Journal of Geophysical Research, 2003Co-Authors: X Y Zhang, S L Gong, Z Shen, F M Mei, Lintao Liu, Z J Zhou, Dongfang Wang, Yaqiang Wang, Yuanyue ChengAbstract:[1] Mass loading, 20 elemental concentrations, and time series of aerosol particles were investigated over the China Dust Storm Research (ChinaDSR) observational network stations from March to May 2001 during the intensive field campaign period of ACE-Asia. Four extensive and several minor dust storm (DS) events were observed. Mass balance calculations showed that 45 - 82% of the observed aerosol mass was attributable to Asian soil dust particles among the sites, in which Ca and Fe contents are enriched to 12% and 6%, respectively, in the Western High-Dust source regions compared with dust aerosols ejected from the Northern High- Dust source regions. For the latter areas, elemental contents exhibited high Si (30%) and low Fe (4%). For all major source areas and depositional regions, aluminium (Al) comprises 7% of Asian dust. Air mass back-trajectory analysis showed that five major Transport pathways of Asian dust storms dominated dust Transport in China during spring 2001, all of which passed over Beijing. Measurements also suggest that the sand land in northeastern China is a potential source for Asian dust. The size Distribution for estimating vertical dust flux was derived from the observed surface dust size Distributions in the desert regions. For particle diameters between 0.25 and 16 mum, a lognormal Distribution was obtained from averaging observations at various deserts with a mass mean diameter of 4.5 mum and a standard deviation of 1.5. This range of soil dust constitutes about 69% of the total dust loading. The fractions for particles in the size ranges of 16 mum are around 1.7% and 30%, respectively.
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characterization of soil dust aerosol in china and its Transport and Distribution during 2001 ace asia 2 model simulation and validation
Journal of Geophysical Research, 2003Co-Authors: X Y Zhang, S L Gong, T L Zhao, Ian G Mckendry, Daniel A JaffeAbstract:[1] A size-segregated soil dust emission and Transport model, Northern Aerosol Regional Climate Model (NARCM), was used to simulate the production and Transport of Asian soil dust during the Aerosol Characterization Experiment-Asia (ACE-Asia) period from March to May 2001. The model is driven by the NCEP reanalyzed meteorology and has all the atmospheric aerosol physical processes of soil dust: production, Transport, growth, coagulation, and dry and wet deposition. A Chinese soil texture map that infers the soil grain-size Distribution with 12 categories was generated to drive the size-distributed soil dust emission scheme [Alfaro et al., 1997; Marticorena and Bergametti, 1995]. The size Distribution of vertical dust flux was derived from the observed surface dust-size Distribution in the desert regions. Parameters applicable to the Asian deserts for the dust emission scheme are assessed. Model simulations were compared with ground-based measurements in East Asia and North America and with satellite measurements for the same period of time. The model captured most of the dust mobilization episodes during this period in China and reasonably simulated the concentrations in source regions and downwind areas from East China to western North America. About 252.8 Mt of soil dust below d < 40 μm was estimated to be emitted in the East Asian deserts between 1 March and 31 May 2001 with ∼60% attributed to four major dust storms. The vertical dust loadings above 700 hPa correlate reasonably well with Total Ozone Mapping Spectrometer aerosol index (TOMS AI) observations. The sensitivity analysis of model performance to soil size Distribution, water moisture, and meteorology was carried out with the observational data to establish the most appropriate parameters and conditions for the Chinese soil dust production and Transport.
Daniel A Jaffe - One of the best experts on this subject based on the ideXlab platform.
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characterization of soil dust aerosol in china and its Transport and Distribution during 2001 ace asia 2 model simulation and validation
Journal of Geophysical Research, 2003Co-Authors: X Y Zhang, S L Gong, T L Zhao, Ian G Mckendry, Daniel A JaffeAbstract:[1] A size-segregated soil dust emission and Transport model, Northern Aerosol Regional Climate Model (NARCM), was used to simulate the production and Transport of Asian soil dust during the Aerosol Characterization Experiment-Asia (ACE-Asia) period from March to May 2001. The model is driven by the NCEP reanalyzed meteorology and has all the atmospheric aerosol physical processes of soil dust: production, Transport, growth, coagulation, and dry and wet deposition. A Chinese soil texture map that infers the soil grain-size Distribution with 12 categories was generated to drive the size-distributed soil dust emission scheme [Alfaro et al., 1997; Marticorena and Bergametti, 1995]. The size Distribution of vertical dust flux was derived from the observed surface dust-size Distribution in the desert regions. Parameters applicable to the Asian deserts for the dust emission scheme are assessed. Model simulations were compared with ground-based measurements in East Asia and North America and with satellite measurements for the same period of time. The model captured most of the dust mobilization episodes during this period in China and reasonably simulated the concentrations in source regions and downwind areas from East China to western North America. About 252.8 Mt of soil dust below d < 40 μm was estimated to be emitted in the East Asian deserts between 1 March and 31 May 2001 with ∼60% attributed to four major dust storms. The vertical dust loadings above 700 hPa correlate reasonably well with Total Ozone Mapping Spectrometer aerosol index (TOMS AI) observations. The sensitivity analysis of model performance to soil size Distribution, water moisture, and meteorology was carried out with the observational data to establish the most appropriate parameters and conditions for the Chinese soil dust production and Transport.
Yuanyue Cheng - One of the best experts on this subject based on the ideXlab platform.
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characterization of soil dust aerosol in china and its Transport and Distribution during 2001 ace asia 1 network observations
Journal of Geophysical Research, 2003Co-Authors: X Y Zhang, S L Gong, Z Shen, F M Mei, Lintao Liu, Z J Zhou, Dongfang Wang, Yaqiang Wang, Yuanyue ChengAbstract:[1] Mass loading, 20 elemental concentrations, and time series of aerosol particles were investigated over the China Dust Storm Research (ChinaDSR) observational network stations from March to May 2001 during the intensive field campaign period of ACE-Asia. Four extensive and several minor dust storm (DS) events were observed. Mass balance calculations showed that 45 - 82% of the observed aerosol mass was attributable to Asian soil dust particles among the sites, in which Ca and Fe contents are enriched to 12% and 6%, respectively, in the Western High-Dust source regions compared with dust aerosols ejected from the Northern High- Dust source regions. For the latter areas, elemental contents exhibited high Si (30%) and low Fe (4%). For all major source areas and depositional regions, aluminium (Al) comprises 7% of Asian dust. Air mass back-trajectory analysis showed that five major Transport pathways of Asian dust storms dominated dust Transport in China during spring 2001, all of which passed over Beijing. Measurements also suggest that the sand land in northeastern China is a potential source for Asian dust. The size Distribution for estimating vertical dust flux was derived from the observed surface dust size Distributions in the desert regions. For particle diameters between 0.25 and 16 mum, a lognormal Distribution was obtained from averaging observations at various deserts with a mass mean diameter of 4.5 mum and a standard deviation of 1.5. This range of soil dust constitutes about 69% of the total dust loading. The fractions for particles in the size ranges of 16 mum are around 1.7% and 30%, respectively.
Anant K. Menon - One of the best experts on this subject based on the ideXlab platform.
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Intracellular sterol Transport and Distribution.
Current opinion in cell biology, 2006Co-Authors: Frederick R. Maxfield, Anant K. MenonAbstract:Sterols are important components of many biological membranes, and changes in sterol levels can have dramatic effects on membrane properties. Sterols are Transported rapidly between cellular organelles by vesicular and nonvesicular processes. Recent studies have identified transmembrane proteins that facilitate the removal of sterols from membranes as well as soluble cytoplasmic proteins that play a role in their movement through the cytoplasm. The mechanisms by which these proteins work are generally not well understood. Cells maintain large differences in the sterol:phospholipid ratio in different organelles. Recent theoretical and experimental studies indicate ways in which the lipid environment can alter the chemical potential of sterols, which may help to explain aspects of their Transport kinetics and Distribution.
