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NASA/USDA Workshop on Evapotranspiration

NASA/USDA Workshop on Evapotranspiration. Workshop Objectives: To define the needs and requirements for evapotranspiration data in weather and climate studies, in natural and agro- ecoystem monitoring, and in water resource management.

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NASA/USDA Workshop on Evapotranspiration

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  1. NASA/USDA Workshop on Evapotranspiration • Workshop Objectives: • To define the needs and requirements for evapotranspiration data in weather and climate studies, in natural and agro-ecoystem monitoring, and in water resource management. • To review the methods used to measure and model evapotranspiration. • To assess surface and satellite observation systems required to support ET measurement, modeling and evaluation. • To assess the feasibility of developing a proposal for a task on evapotranspiration for the 2012-2015 GEO Work Plan. • To explore the level of support and consensus for developing a strategy for establishing evapotranspiration as an Essential Climate Variable (ECV) within the Global Climate Observing System (GCOS) framework

  2. Impact of Evapotranspiration on the Water Cycle • Terrestrial ET “consumes” ~60% of incident radiation (Trenberth et al., 2009). • ET returns to the atmosphere ~2/3 of precipitation over land (Chahine, 1992). • ET as latent energy in the atmosphere cools northern hemisphere by ~15 to 25 degrees (Shukla and Mintz, 1982). Evapotranspiration is regarded as an Essential Climate Variable (ECV) because of the diverse and multiple roles of ET as: a driver of surface energy partitioning and consequently its role in atmospheric boundary layer development and affecting weather patterns a primary influence on and indicator of water storage and availability in hydrologic and water resources systems a primary indicator of vegetation stresses and ecosystem health under changing climate.

  3. Monthly groundwater storage anomalies for the Sacramento and San Joaquin River Basins in mm, from October 2003 to March 2010. Monthly errors shown by gray shading. The blue line represents the overall trend in groundwater storage changes for the 78‐month period. The red lines represent the trends from October 2003 and March 2006 and April 2006 through March 2010. Famiglietti et al.GEOPHYSICAL RESEARCH LETTERS, VOL. 38, L03403, doi:10.1029/2010GL046442, 2011 Groundwater depletion in the regions of the U.S.A., Europe, China and India and the Middle East for the year 2000 (mm · a−1; clockwise from top‐left). Wada et al. GEOPHYSICAL RESEARCH LETTERS, VOL. 37, L20402, doi:10.1029/2010GL044571, 2010

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