Journal article
Responses of global terrestrial evapotranspiration to climate change and increasing atmospheric CO2 in the 21st century
S Pan, H Tian, SRS Dangal, Q Yang, J Yang, C Lu, B Tao, W Ren, Z Ouyang
Earth S Future | AMER GEOPHYSICAL UNION | Published : 2015
DOI: 10.1002/2014EF000263
Abstract
Quantifying the spatial and temporal patterns of the water lost to the atmosphere through land surface evapotranspiration (ET) is essential for understanding the global hydrological cycle, but remains much uncertain. In this study, we use the Dynamic Land Ecosystem Model to estimate the global terrestrial ET during 2000-2009 and project its changes in response to climate change and increasing atmospheric CO2 under two IPCC SRES scenarios (A2 and B1) during 2010-2099. Modeled results show a mean annual global terrestrial ET of about 549 (545-552) mm yr-1 during 2000-2009. Relative to the 2000s, global terrestrial ET for the 2090s would increase by 30.7 mm yr-1 (5.6%) and 13.2 mm yr-1 (2.4%) u..
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Funding Acknowledgements
Climate data for the historical period used in this study was obtained from CRU-NCEP reanalysis [Wei et al., 2013]. Future climate datasets were downloaded from the World Climate Research Programme's Coupled Model Intercomparison Project phase 3 (CMIP3) multi-model database [Meehl et al., 2007]. Cropland and urban distribution datasets were obtained by aggregating the 5-min resolution HYDE v3.2 global cropland and urban distribution. Historical annual CO<INF>2</INF> concentration data were from Earth System Research Laboratory (ESRL, http://www.esrl.noaa.gov/gmd/ccgg/trends/). Soil bulk density and soil pH maps were obtained from digital general soil association map developed by USDA Natural Resource Conservation. The topography map used for model simulation was derived from USGS national elevation dataset (http://ned.usgs.gov). This study was supported by NSF Decadal and Regional Climate Prediction using Earth System Models (AGS-1243220), NSF Dynamics of Coupled Natural and Human Systems (1210360), and NASA Interdisciplinary Science Program (NNX10AU06G, NNG04GM39C).