Large-eddy Advection in Evapotranspiration Estimates from an Array of Eddy Covariance Towers

Friday, 19 December 2014: 1:55 PM
Xiaomao Lin1, Steven R Evett2, Prasanna H Gowda3, Paul D Colaizzi4 and Rob Aiken1, (1)Kansas State Univ, Manhattan, KS, United States, (2)USDA ARS, Bushland, TX, United States, (3)Prasanna H. Gowda, USDA-ARS-CPRL, Frisco, TX, United States, (4)USDA-ARS PO Drawer 10, Bushland, TX, United States
Evapotranspiration was continuously measured by an array of eddy covariance systems and large weighting lysimeter in a sorghum in Bushland, Texas in 2014. The advective divergence from both horizontal and vertical directions were measured through profile measurements above canopy. All storage terms were integrated from the depth of soil heat flux plate to the height of eddy covariance measurement. Therefore, a comparison between the eddy covariance system and large weighing lysimeter was conducted on hourly and daily basis. The results for the discrepancy between eddy covariance towers and the lysimeter will be discussed in terms of advection and storage contributions in time domain and frequency domain.