Assessing interannual variability of evapotranspiration at the catchment scale using satellite‐based evapotranspiration data sets

Cheng, Lei; Xu, Zongxue; Wang, Dingbao; Cai, Ximing

doi:10.1029/2011wr010636

Cited by 92 publications

(105 citation statements)

References 82 publications

(109 reference statements)

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“…Various ET estimation models that use remotely sensed data have been developed in recent decades, including surface energy balance models (Jiang and Islam, 1999;Su, 2002;Miralles et al, 2011;Anderson et al, 2012), empirical statistical models (Wang and Liang, 2008), physical models (Mu et al, 2007; K. and water balance models (Cheng et al, 2011;Rodell et al, 2011;Sahoo et al, 2011;Zeng et al, 2012;. Recently, a large number of papers exist on the use of remotely sensed data to estimate ET, including several review papers (Courault et al, 2005;Verstraeten et al, 2008;Gowda et al, 2007; Z.…”

Section: Introductionmentioning

confidence: 99%

Evapotranspiration and water yield over China's landmass from 2000 to 2010

Liu

Zhou

et al. 2013

Hydrol. Earth Syst. Sci.

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Abstract. Terrestrial carbon and water cycles are interactively linked at various spatial and temporal scales. Evapotranspiration (ET) plays a key role in the terrestrial water cycle, altering carbon sequestration of terrestrial ecosystems. The study of ET and its response to climate and vegetation changes is critical in China because water availability is a limiting factor for the functioning of terrestrial ecosystems in vast arid and semiarid regions. To constrain uncertainties in ET estimation, the process-based Boreal Ecosystem Productivity Simulator (BEPS) model was employed in conjunction with a newly developed leaf area index (LAI) data set, MODIS land cover, meteorological, and soil data to simulate daily ET and water yield at a spatial resolution of 500 m over China for the period from 2000 to 2010. The spatial and temporal variations of ET and water yield were analyzed. The influences of climatic factors (temperature and precipitation) and vegetation (land cover types and LAI) on these variations were assessed.Validations against ET measured at five ChinaFLUX sites showed that the BEPS model was able to simulate daily and annual ET well at site scales. Simulated annual ET exhibited a distinguishable southeast to northwest decreasing gradient, corresponding to climate conditions and vegetation types. It increased with the increase of LAI in 74 % of China's landmass and was positively correlated with temperature in most areas of southwest, south, east, and central China. The correlation between annual ET and precipitation was positive in the arid and semiarid areas of northwest and north China, but negative in the Tibetan Plateau and humid southeast China. The national annual ET varied from 345.5 mm in 2001 to 387.8 mm in 2005, with an average of 369.8 mm during the study period. The overall rate of increase, 1.7 mm yr −1 (R 2 = 0.18, p = 0.19), was mainly driven by the increase of total ET in forests. During 2006During -2009 and LAI decreased widely and consequently caused a detectable decrease in national total ET. Annual ET increased over 62.2 % of China's landmass, especially in the cropland areas of the southern Haihe River basin, most of the Huaihe River basin, and the southeastern Yangtze River basin. It decreased in parts of northeast, north, northwest, south China, especially in eastern Qinghai-Tibetan Plateau, the south of Yunnan Province, and Hainan Province. Reduction in precipitation and increase in ET caused vast regions in China, especially the regions south of Yangtze River, to experience significant decreases in water yield, while some sporadically distributed areas experienced increases in water yield. This study shows that the terrestrial water cycles in China's terrestrial ecosystems appear to have been intensified by recent climatic variability and human induced vegetation changes.

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Section: Introductionmentioning

confidence: 99%

Evapotranspiration and water yield over China's landmass from 2000 to 2010

Liu

Zhou

et al. 2013

Hydrol. Earth Syst. Sci.

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“…Therefore, accurate ET estimates are required to understand local to global water and energy cycles and improve hydrological applications (Nemani et al, 2002;Dirmeyer et al, 2006;Trenberth et al, 2007;Cheng et al, 2011), water resource management (Bastiaanssen et al, 2005;Oki and Kanae, 2006;Yang et al, 2012), drought monitoring and assessment (Heim, 2002;Yao et al, 2011), irrigation scheduling (Allen et al, 1998;Dodds et al, 2005) and climatological studies (Pielke et al, 1998;Teuling et al, 2009). However, ET is one of the most problematic components of the water cycle to accurately quantify Long et al, 2014) because of the heterogeneity of land surfaces and the large number of controlling factors that are involved, such as plant biophysics, soil properties, atmospheric conditions and topography (Shuttleworth and Wallace, 1985;Bastiaanssen et al, 1998;Glenn et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

An evapotranspiration product for arid regions based on the three-temperature model and thermal remote sensing

Xiong¹,

Zhao

Tian

et al. 2015

Journal of Hydrology

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s u m m a r yAn accurate estimation of evapotranspiration (ET) is crucial to better understand the water budget and improve related studies. Satellite remote sensing provides an unprecedented opportunity to map the spatiotemporal distribution of ET. However, ET values from barren or sparsely vegetated areas in arid regions are often assumed to be zero in typical ET products because of their low values. In addition, separating ET into soil evaporation (E s ) and vegetation transpiration (E c ) is difficult. To address these challenges, we developed an ET product (MOD3T) based on a three-temperature model and thermal remote sensing, specifically Moderate Resolution Imaging Spectroradiometer (MODIS) data. MOD3T has a spatial resolution of 1 km and a temporal resolution of 8 days. All input parameters except air temperature were obtained from MODIS datasets. Validation in two adjacent arid river basins in northwestern China showed that the mean absolute errors (mean absolute percent errors) between the MOD3T and flux tower ET were 0.71 mm d À1 (18.5%) and 0.16 mm d À1 (24.9%) for a densely vegetated area and sparsely vegetated sandy desert, respectively. The error between the MOD3T and water balance ET was 24 mm y À1 (8.1%). The E c /ET or E s /ET of MOD3T was comparable to the observed stable oxygen and hydrogen isotopes. Unlike the MODIS ET (MOD16), MOD3T could not provide continuous ET values (as 70% of the MOD16 area lacked data) but exhibited relatively low uncertainty, particularly in cold seasons. Therefore, MOD3T can provide ET, E s and E c estimates for arid regions within acceptable ranges.

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“…De posse de E e P, é possível estimar Q a partir do balanço hídrico da bacia e quando consideradas escalas temporais suficientemente longas. A estimativa de valores médios de longo período de Q e E são importantes para dar uma ideia geral do balanço hídrico de uma bacia hidrográfica, como já observado em outros estudos (Yang et al, 2007;Potter e Zhang, 2009;Cheng et al, 2011 Dooge et al, 1999;Sankarasubramanian et al, 2001;Arora, 2002;Niemann, 2005;Fu et al, 2007;Wang et al, 2008;Fu et al, 2009;Renner et al, 2011;Roderick e Farquar, 2011;Yang e Yang, 2011;Donohue et al, 2012 solo, ora o fazendo do solo para a atmosfera. Entretanto, em bacias tropicais e subtropicais, é razoável assumir que H sempre estará transferindo calor da superfície para a atmosfera, na mesma direção de E. Ou seja, a energia disponível para o processo evaporativo nessas bacias é proveniente apenas da radiação R n .…”

Section: Lista De Tabelasunclassified

“…Diante de sua importância, e conforme apresentado na Tabela 3-1, a maior parte dos parâmetros presentes em modelos tipo Budyko propostos estão relacionados à capacidade do solo em armazenar o montante precipitado. (Milly, 1993;Sankarasubramanian e Vogel, 2002;Porporato et al, 2004;Cheng et al, 2011).…”

Section: -Solo E Condições Geológicasunclassified

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Estimativa de séries anuais de evapotranspiração real e vazão em bacias sem monitoramento fluviométrico com base nas hipóteses de budyko

Otsuki¹

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Assessing interannual variability of evapotranspiration at the catchment scale using satellite‐based evapotranspiration data sets

Cited by 92 publications

References 82 publications

Evapotranspiration and water yield over China's landmass from 2000 to 2010

Evapotranspiration and water yield over China's landmass from 2000 to 2010

An evapotranspiration product for arid regions based on the three-temperature model and thermal remote sensing

Estimativa de séries anuais de evapotranspiração real e vazão em bacias sem monitoramento fluviométrico com base nas hipóteses de budyko

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