Cloud optical and microphysical properties derived from ground-based and satellite sensors over a site in the Yangtze Delta region: CLOUD PROPERTIES IN EASTERN CHINA
- State Laboratory of Earth Surface Process and Resource Ecology and College of Global Change and Earth System Science, Beijing Normal University, Beijing China; Department of Atmospheric and Oceanic Science and Earth System Science Interdisciplinary Center, University of Maryland, College Park Maryland USA; Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Nanjing University of Information Science and Technology, Nanjing China
- State Laboratory of Earth Surface Process and Resource Ecology and College of Global Change and Earth System Science, Beijing Normal University, Beijing China; Department of Atmospheric and Oceanic Science and Earth System Science Interdisciplinary Center, University of Maryland, College Park Maryland USA
- Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Nanjing University of Information Science and Technology, Nanjing China
- Department of Meteorology, University of Reading, Reading UK
- Department of Atmospheric and Oceanic Science and Earth System Science Interdisciplinary Center, University of Maryland, College Park Maryland USA
- Argonne National Laboratory, Lemont Illinois USA
- NOAA/Center for Satellite Applications and Research, College Park Maryland USA
Comprehensive surface - based retrievals of cloud optical and microphysical properties were made at Taihu, a highly polluted site in central Yangtze Delta region, during a research campaign from May 2008 to December 2009. C loud optical depth (COD) , effective radius (R e ) and liquid water path (LWP) were retrieved from measurements made with a suite of ground - based and space - borne instruments, including an Analytical Spectral Devices (ASD) spectroradiometer , a Multi - Filter Rotating Shadowband R adiometer (MFRSR) , a Multichannel Microwave Radiometer Profiler (MWRP), and the Moderate Resolution Imaging Spectroradiometer ( MODIS) on Terra and Aqua satellites . Retrievals from zenith radiance measurements capture better the temporal variation of cloud properties than do retrievals from hemispherical fluxes . Annual mean LWP, COD and R e are 115.8 ± 90.8 g/m 2 , 28.5 ± 19.2, and 6.9 ± 4.2 μ m . Over 90% of LWP is less than 250 g/m 2 . Most of COD (>90%) fall s between 5 and 60 and ~ 80% of R e is less than 10 μ m . Maximum ( minimum ) values of LWP and R e occur in summer ( winter ); COD is highest in winter and spring. R aining and non - raining clouds have significant difference s in LWP, COD and R e . R ainfall frequency i s best correlated with LWP, followed by COD and R e . Cloud properties retrieved from multiple ground - based instruments are also compared with those from satellite retrievals. On average, relative to surface retrievals, mean differences of satellite retrievals in cloud LWP, COD and R e were - 33.6 g/m 2 ( - 26.4%), - 5.8 ( - 31.4%), and 2.9 μ m (29.3% ) for 11 MODIS - Terra overpasses , and - 43.3 g/m 2 ( - 2 2.3 %), - 3.0 ( - 10.0 %) and - 1.3 μ m ( - 12.0 %) for 8 MODIS - Aqua 40 overpasses, respectively. These discrep ancies indicate that MODIS cloud products still suffer 41 from large uncertainties in this region
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- Ministry of Science and Technology of the People's Republic of China; USDOE Office of Science - Office of Biological and Environmental Research; Key University Science Research Project of Jiangsu Province; National Natural Science Foundation of China (NSFC)
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1392453
- Journal Information:
- Journal of Geophysical Research: Atmospheres, Vol. 118, Issue 16; ISSN 2169-897X
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
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