气候变化领域集成服务门户(CCPortal): Orographic biases in IMERG precipitation estimates in the Ebro River basin (Spain): The effects of rain gauge density and altitude

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DOI	10.1016/j.atmosres.2020.105068
	Orographic biases in IMERG precipitation estimates in the Ebro River basin (Spain): The effects of rain gauge density and altitude
	Navarro A.; García-Ortega E.; Merino A.; Sánchez J.L.; Tapiador F.J.
发表日期	2020
ISSN	0169-8095
卷号	244
英文摘要	A gridded precipitation dataset derived from the high-density rain gauge network of the Ebro River Basin Authority is used to evaluate the performance of Integrated Multi-satellitE Retrievals for GPM (IMERG) level-3 estimates. Although aggregated values compare well, several differences are found between climate regions. The research investigates the role of orography and gauge density on IMERG performance. There are important discrepancies over un-instrumented areas in the Pyrenees (R2 = 0.31) but the correlation dramatically increases (R2 > 0.71) when at least one rain gauge is available for calibration, even in complex, high-altitude terrain (>1500 m). IMERG overestimates precipitation at both lower altitudes (<500 m), especially in summer and autumn because of convective activity, and mid-altitudes (600–1200 m) in the northwestern study area, where weather is dominated by the advection of wet maritime air masses. The main conclusion is that IMERG performance strongly depends on altitude and the precipitation regime. IMERG is nonetheless a suitable alternative to gridded gauge-derived only products for hydrologic operations, especially in areas with a sparse rain gauge network. © 2020 Elsevier B.V.
英文关键词	Gridded data; IMERG; Precipitation; Rain gauges; Satellite observations; Surface observations
语种	英语
scopus关键词	Rain gages; Watersheds; Aggregated values; Climate regions; Convective activity; Ebro river basin; Precipitation regimes; Rain gauge networks; Rain gauges; Satellite retrieval; Rain; air mass; altitude; convective system; estimation method; mountain region; orographic effect; performance assessment; precipitation assessment; raingauge; river basin; satellite data; terrain; Ebro Basin; Pyrenees; Spain
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/141855
作者单位	Universidad de León (ULE), Atmospheric Physics Group (GFA), Environmental Institute (IMA), León, 24071, Spain; University of Castilla-La Mancha (UCLM), Institute of Environmental Sciences (ICAM), Faculty of Environmental Sciences and Biochemistry, Earth and Space Sciences (ESS), Group. Avda. Carlos III s/n, Toledo, 45071, Spain
推荐引用方式 GB/T 7714	Navarro A.,García-Ortega E.,Merino A.,et al. Orographic biases in IMERG precipitation estimates in the Ebro River basin (Spain): The effects of rain gauge density and altitude[J],2020,244.
APA	Navarro A.,García-Ortega E.,Merino A.,Sánchez J.L.,&Tapiador F.J..(2020).Orographic biases in IMERG precipitation estimates in the Ebro River basin (Spain): The effects of rain gauge density and altitude.Atmospheric Research,244.
MLA	Navarro A.,et al."Orographic biases in IMERG precipitation estimates in the Ebro River basin (Spain): The effects of rain gauge density and altitude".Atmospheric Research 244(2020).