DOI: 10.1175/JCLI-D-11-00724.1
Scopus记录号: 2-s2.0-84870006285
论文题名: Object-based evaluation of MERRA cloud physical properties and radiative fluxes during the 1998 El Niño-la Niña transition
作者: Posselt D.J. ; Jongeward A.W. ; Hsu C.-Y. ; Potter G.L.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2012
卷: 25, 期: 21 起始页码: 7313
结束页码: 7327
语种: 英语
Scopus关键词: Cloud properties
; Convective clouds
; Convective systems
; Deep convective clouds
; Disaggregation
; ENSO
; Hydrologic cycles
; Ice clouds
; Model evaluation
; Object based
; Object size
; Optical depth
; Radiative fluxes
; Reanalysis
; Research and application
; Retrospective analysis
; Satellite observations
; Short-wave radiation
; Sub-grids
; Tropical rainfall measuring mission satellites
; Atmospheric thermodynamics
; Clouds
; Computer simulation
; Probability density function
; Rain
; Tropics
; Nickel compounds
; cloud microphysics
; cloud radiative forcing
; convective cloud
; convective system
; El Nino
; hydrological cycle
; La Nina
; optical depth
; performance assessment
; probability density function
; TRMM
英文摘要: The Modern-Era Retrospective Analysis for Research and Application (MERRA) is a reanalysis designed to produce an improved representation of the Earth's hydrologic cycle. This study examines the representation of deep convective cloudsin MERRA, comparing analyzed liquid and ice clouds with deep convective cloud objects observed by instruments on the Tropical Rainfall Measuring Mission satellite. Results show that MERRA contains deep convective cloud in 98.1% of the observed cases. MERRA-derived probability density functions (PDFs) of cloud properties have a similar form as the observed PDFs and exhibit a similar trend with changes in object size. Total water path, optical depth, and outgoing shortwave radiation (OSR) in MERRA are found to match the cloud object observations quite well; however, there appears to be a bias toward higher-than-observed cloud tops in the MERRA. The reanalysis fits the observations most closely for the largest class of convective systems, with performance generally decreasing with a transition to smaller convective systems. Comparisons of simulated total water path, optical depth, and OSR are found to be highly sensitive to the assumed subgrid distribution of condensate and indicate the need for caution when interpreting model-data comparisons that require disaggregation of grid-scale cloud to satellite pixel scales. © 2012 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52139
Appears in Collections: 气候变化事实与影响
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作者单位: University of Michigan, Ann Arbor, MI, United States; University of Maryland, College Park, MD, United States
Recommended Citation:
Posselt D.J.,Jongeward A.W.,Hsu C.-Y.,et al. Object-based evaluation of MERRA cloud physical properties and radiative fluxes during the 1998 El Niño-la Niña transition[J]. Journal of Climate,2012-01-01,25(21)