DOI: 10.5194/hess-18-5077-2014
Scopus记录号: 2-s2.0-84918521349
论文题名: Satellite-driven downscaling of global reanalysis precipitation products for hydrological applications
作者: Seyyedi H ; , Anagnostou E ; N ; , Beighley E ; , McCollum J
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2014
卷: 18, 期: 12 起始页码: 5077
结束页码: 5091
语种: 英语
Scopus关键词: Data flow analysis
; Error correction
; Error statistics
; Floods
; Mean square error
; NASA
; Rain gages
; Runoff
; Satellites
; Storms
; Hydrologic applications
; Land data assimilation systems
; Precipitation and runoff
; Precipitation products
; Root-mean square errors
; Satellite precipitation products
; Spatial and temporal resolutions
; Susquehanna river basins
; Rain
; data assimilation
; data set
; downscaling
; ensemble forecasting
; error correction
; hydrological modeling
; precipitation (climatology)
; radar
; runoff
; satellite data
; satellite imagery
; TRMM
; Susquehanna Basin
; United States
英文摘要: Deriving flood hazard maps for ungauged basins typically requires simulating a long record of annual maximum discharges. To improve this approach, precipitation from global reanalysis systems must be downscaled to a spatial and temporal resolution applicable for flood modeling. This study evaluates such downscaling and error correction approaches for improving hydrologic applications using a combination of NASA's Global Land Data Assimilation System (GLDAS) precipitation data set and a higher resolution multi-satellite precipitation product (TRMM). The study focuses on 437 flood-inducing storm events that occurred over a period of ten years (2002-2011) in the Susquehanna River basin located in the northeastern United States. A validation strategy was devised for assessing error metrics in rainfall and simulated runoff as function of basin area, storm severity, and season. The WSR-88D gauge-adjusted radar-rainfall (stage IV) product was used as the reference rainfall data set, while runoff simulations forced with the stage IV precipitation data set were considered as the runoff reference. Results show that the generated rainfall ensembles from the downscaled reanalysis product encapsulate the reference rainfall. The statistical analysis consists of frequency and quantile plots plus mean relative error and root-mean-square error statistics. The results demonstrated improvements in the precipitation and runoff simulation error statistics of the satellite-driven downscaled reanalysis data set compared to the original reanalysis precipitation product. Results vary by season and less by basin scale. In the fall season specifically, the downscaled product has 3 times lower mean relative error than the original product; this ratio increases to 4 times for the simulated runoff values. The proposed downscaling scheme is modular in design and can be applied on any gridded satellite and reanalysis data set. © Author(s) 2014. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78044
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Civil and Environmental Engineering, University of Connecticut, Storrs, CT, United States; Department of Civil and Environmental Engineering, Northeastern University, Boston, MA, United States; Center for Property Risk Solutions, FM Global, Research Division, Norwood, MA, United States
Recommended Citation:
Seyyedi H,, Anagnostou E,N,et al. Satellite-driven downscaling of global reanalysis precipitation products for hydrological applications[J]. Hydrology and Earth System Sciences,2014-01-01,18(12)