气候变化领域集成服务门户(CCPortal): Basin scale rainfall-evapotranspiration dynamics in a tropical semiarid environment during dry and wet years

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DOI	10.1016/j.jag.2018.10.007
	Basin scale rainfall-evapotranspiration dynamics in a tropical semiarid environment during dry and wet years
	Mutti P.R.; da Silva L.L.; Medeiros S.D.S.; Dubreuil V.; Mendes K.R.; Marques T.V.; Lúcio P.S.; Santos e Silva C.M.; Bezerra B.G.
发表日期	2019
ISSN	15698432
起始页码	29
结束页码	43
卷号	75
英文摘要	In semiarid regions the occurrence of alternating long drought and heavy rainfall periods directly impacts water availability, affecting human water supply, agriculture development and the provision of ecosystem services. Because of that, research on the water input and output fluxes at the basin scale is of paramount importance. In this sense, rainfall-evapotranspiration (ET) dynamics play a critical role in water, soil and vegetation interactions, in hydrometeorological modelling and in the energy fluxes dynamics of semiarid regions. Therefore, the objective of this study was to quantify daily ET during a wet year and a dry year in a watershed located in the Brazilian Semiarid, by using remote sensing data and formulations based on the Simplified Surface Energy Balance Index (S-SEBI) and the Simplified Surface Energy Balance (SSEB) algorithms. Land surface temperature, albedo and NDVI data from MODIS sensor and solar radiation data from weather stations located in the basin were used. Rainfall analysis indicated 2009 and 2012 as being representatives of anomalously wet and dry years respectively, which were selected for the quantification of ET. The proposed algorithm was adjusted and verified with data from a flux tower equipped with eddy covariance system. Daily remote sensing ET estimates showed good agreement with observed values (RMSE = 0.79 mm.d −1 ) and the annual ET relative error was of 7.7% (35.4 mm.year −1 ). Results showed that the native vegetation can delay its dormant state for five months during wet years. During the wet year, ET differences between land cover classes were less noticeable due to soil saturation and the urgency of vegetated surfaces to meet their physiological needs. In dry year, however, differences were more evident, with bare soil presenting lower ET rates and vegetation classes showing higher ET values. © 2018 Elsevier B.V.
英文关键词	Caatinga; Eddy covariance; ET; MODIS; Remote sensing; S-SEBI; Seasonally dry tropical forest; SSEB
语种	英语
scopus关键词	drought; eddy covariance; energy balance; evapotranspiration; MODIS; rainfall; remote sensing; semiarid region; tropical forest; Brazil
来源期刊	International Journal of Applied Earth Observation and Geoinformation
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156532
作者单位	Climate Sciences Program, Federal University of Rio Grande do Norte (UFRN), Natal, Rio Grande do Norte, Brazil; Executive Agency of Water Management of the Paraíba State, Campina Grande, Paraíba, Brazil; National Institute of the Semiarid (INSA), Campina Grande, Paraíba, Brazil; COSTEL LETG, UMR 6554, CNRS, University of Rennes 2, Rennes, Bretagne, France; Department of Atmospheric and Climate Sciences, Federal University of Rio Grande do Norte (UFRN), Natal, Rio Grande do Norte, Brazil
推荐引用方式 GB/T 7714	Mutti P.R.,da Silva L.L.,Medeiros S.D.S.,et al. Basin scale rainfall-evapotranspiration dynamics in a tropical semiarid environment during dry and wet years[J],2019,75.
APA	Mutti P.R..,da Silva L.L..,Medeiros S.D.S..,Dubreuil V..,Mendes K.R..,...&Bezerra B.G..(2019).Basin scale rainfall-evapotranspiration dynamics in a tropical semiarid environment during dry and wet years.International Journal of Applied Earth Observation and Geoinformation,75.
MLA	Mutti P.R.,et al."Basin scale rainfall-evapotranspiration dynamics in a tropical semiarid environment during dry and wet years".International Journal of Applied Earth Observation and Geoinformation 75(2019).