Satellite detection of increases in global land surface evapotranspiration during 1984-2007

As a key component of digital earth, remotely sensed data provides the compelling evidence that the amount of water vapour transferred from the entire global surface to the atmosphere increased from 1984 to 2007. The validation results from the earlier evapotranspiration (ET) estimation algorithm ba...

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Bibliographic Details
Published in:International Journal of Digital Earth
Main Authors: Yao, Yunjun, Liang, Shunlin, Qin, Qiming, Wang, Kaicun, Liu, Shaomin, Zhao, Shaohua
Other Authors: Yao, YJ (reprint author), Beijing Normal Univ, Coll Global Change & Earth Syst Sci, Beijing 100875, Peoples R China., Beijing Normal Univ, Coll Global Change & Earth Syst Sci, Beijing 100875, Peoples R China., Univ Maryland, Dept Geog, College Pk, MD 20742 USA., Peking Univ, Inst Remote Sensing & GIS, Beijing 100871, Peoples R China., Beijing Normal Univ, State Key Lab Remote Sensing Sci, Sch Geog, Beijing 100875, Peoples R China., Minist Environm Protect, Environm Satellite Ctr, Beijing, Peoples R China., Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China.
Format: Journal/Newspaper
Language:English
Published: international journal of digital earth 2012
Subjects:
digital earth
evapotranspiration
global land surface
satellite radiation products
CONTERMINOUS UNITED-STATES
NET PRIMARY PRODUCTION
POTENTIAL EVAPOTRANSPIRATION
MODEL SIMULATIONS
CLIMATE-CHANGE
RIVER-BASIN
HEAT-FLUX
EVAPORATION
VEGETATION
TRENDS
Antarc*
Antarctica
Online Access:https://hdl.handle.net/20.500.11897/155739
https://doi.org/10.1080/17538947.2011.598953
Description
Summary:As a key component of digital earth, remotely sensed data provides the compelling evidence that the amount of water vapour transferred from the entire global surface to the atmosphere increased from 1984 to 2007. The validation results from the earlier evapotranspiration (ET) estimation algorithm based on net radiation (R-n), Normalised Difference Vegetation Index (NDVI), air temperature and diurnal air temperature range (DTaR) showed good agreement between estimated monthly ET and ground-measured ET from 20 flux towers. Our analysis indicates that the estimated actual ET has increased on average over the entire global land surface except for Antarctica during 1984-2007. However, this increasing trend disappears after 2000 and the reason may be that the decline in net radiation and NDVI during this period depleted surface soil moisture. Moreover, the good correspondence between the precipitation trend and the change in ET in arid and semi-arid regions indicated that surface moisture linked to precipitation affects ET. The input parameters R-n, T-air, NDVI and DTaR show substantial spatio-temporal variability that is almost consistent with that of actual ET from 1984 to 2007 and contribute most significantly to the variation in actual ET. Geography, Physical Remote Sensing SCI(E) 0 ARTICLE 4 299-318 5

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