Room 1670 Beyster Building
Speaker: Dr. Enrique R. Vivoni, Professor School of Earth and Space Exploration & School of Sustainable Engineering and Built Environment, Global Institute of Sustainability, Arizona State University Tempe, AZ
Title: Terrestrial Sources of Evapotranspiration in the Southwestern U.S. and Northwest Mexico (seminar announcement attached)
Despite its importance in the hydrological cycle, the fluxes of water vapor derived from the terrestrial land surface are difficult to estimate. In this talk, I will present recent estimates of evapotranspiration and its abiotic and biotic components obtained from a macroscale hydrologic model that has been modified to properly account for natural ecosystem structure and agricultural areas in the region. Daily, seasonal and annual evapotranspiration estimates over 2000-2012 are compared to a network of eddy covariance towers, to water balance estimates and to remotely-sensed and model-derived gridded products. The confidence built on the macroscale model estimates provides a means to assess the major sources of evapotranspiration during winter and summer seasons. In addition, an assessment of the impact of two types of land cover change - agricultural extensification and deforestation for pasture establishment – on regional evapotranspiration is discussed.