Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 44, Issue 6, Pages 2792-2801Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016GL072235
Keywords
ET partitioning algorithm; transpiration; site measurements
Categories
Funding
- Japanese Society for the Promotion of Science [26289160, 23226012]
- SOUSEI Program
- ArCS project of MEXT
- Japanese Ministry of Environment [S-12]
- CREST Program of the Japanese Science and Technology Agency
- U.S. National Science Foundation [AGS-1520684]
- Division Of Earth Sciences
- Directorate For Geosciences [1520684] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [15K13566, 16H06291, 26289160, 15KK0199] Funding Source: KAKEN
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Even though knowing the contributions of transpiration (T), soil and open water evaporation (E), and interception (I) to terrestrial evapotranspiration (ET=T+E+I) is crucial for understanding the hydrological cycle and its connection to ecological processes, the fraction of T is unattainable by traditional measurement techniques over large scales. Previously reported global mean T/(E+T+I) from multiple independent sources, including satellite-based estimations, reanalysis, land surface models, and isotopic measurements, varies substantially from 24% to 90%. Here we develop a new ET partitioning algorithm, which combines global evapotranspiration estimates and relationships between leaf area index (LAI) and T/(E+T) for different vegetation types, to upscale a wide range of published site-scale measurements. We show that transpiration accounts for about 57.2% (with standard deviation6.8%) of global terrestrial ET. Our approach bridges the scale gap between site measurements and global model simulations,and can be simply implemented into current global climate models to improve biological CO2 flux simulations.
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