DOI: 10.1029/2012JD018590
论文题名: Evaluating the impact of orbital sampling on satellite-climate model comparisons
作者: Guan B. ; Waliser D.E. ; Li J.-L.F. ; Da Silva A.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 2 起始页码: 355
结束页码: 369
语种: 英语
Scopus关键词: Climate models
; Climatology
; Satellites
; Uncertainty analysis
; Evaluating models
; Model comparison
; Model evaluation
; Ocean surface winds
; Pattern similarity
; Satellite instruments
; Specific humidity
; Standard deviation
; Importance sampling
; climate modeling
; cloud cover
; humidity
; instrumentation
; ozone
; sampling
; satellite data
; satellite imagery
; spatial resolution
英文摘要: The effect of orbital sampling is one of the chief uncertainties in satellite-climate model comparisons. In the context of an ongoing activity to make satellite data more accessible for model evaluation (i.e., obs4MIPs), six variables (temperature, specific humidity, ozone, cloud water, cloud cover, and ocean surface wind) associated with six satellite instruments are evaluated for the orbital sampling effect. Comparisons are made between reanalysis and simulated satellite-sampled data in terms of bias and pattern similarity. It is found that the bias introduced by orbital sampling for long-term annual means, monthly climatologies, and monthly means is largely negligible, which is within ∼3% of the standard deviation of the three quantities for most fields. The bias for 2-hPa temperature and specific humidity, while relatively large (9-10%), is within the estimated observational uncertainty. In terms of pattern similarity, cloud water and upper level specific humidity are the most sensitive to orbital sampling among the variables considered, with the magnitude of the sampling effect dependent on the spatial resolution-insignificant at 1.25° ×1.25° resolution for both. For all variables considered, orbital sampling effects are not an important consideration for model evaluation at 1.25° ×1.25° resolution. At 0.5° ×0.5° , orbital sampling is potentially important for cloud water and upper level specific humidity when evaluating model long-term annual means and monthly climatologies, and for cloud water when evaluating monthly means, all in terms of pattern similarities. Orbital sampling is not an important factor for evaluating zonal means in call cases considered. © 2012. American Geophysical Union.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64001
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, United States; Joint Institute for Regional Earth System Science and Engineering, University of California, Los Angeles, CA, United States; NASA Goddard Space Flight Center, Greenbelt, MD, United States
Recommended Citation:
Guan B.,Waliser D.E.,Li J.-L.F.,et al. Evaluating the impact of orbital sampling on satellite-climate model comparisons[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(2)