School of Meteorology (Defense)

QUANTITATIVE ANALYSIS OF EVAPOTRANSPIRATION CLIMATOLOGY AND VARIATION AT OKLAHOMA MESONET SITES DURING DROUGHT PERIOD

Jing Liu
OU School of Meteorology

01 May 2015, 9:00 AM

National Weather Center, Room 4140
120 David L. Boren Blvd.
University of Oklahoma
Norman, OK

Land-atmosphere interactions play an important role in influencing weather and climate on both local and regional scales. Quantifying the variability of evapotranspiration (ET), which is a critical link to land-atmosphere interactions, would contribute to a better understanding of drought development and alleviation during dry periods. This study estimated ET at Oklahoma Mesonet sites across Oklahoma from 2000 to 2013 by combining in situ measurements and remote sensed data via the Mesonet Evapotranspiration MOdel (MEMO). MEMO simplifies the computation and reduces error in estimation.

Using the estimation results by MEMO, climatological analyses of ET as well as the anomaly analyses were conducted for each of the 9 climate divisions of Oklahoma and for the whole state at temporal periods spanning months, seasons and the annual cycle. Correlation and coupling strength between ET and other environmental variables such as air temperature, precipitation, and soil moisture are also analyzed. Additionally, the year of 2012 was selected to specifically investigate into the dynamic of ET during flash drought. A site-specific analysis was also conducted to understand the variability of ET and its association with other variables during the initiation and intensification of a flash drought.

The algorithm of MEMO will be applied to Mesonet network to provide estimated actual ET to the public. The quantification of ET will benefit scientific research and practical uses in the fields such as climatology, ecosystem, agriculture, and many more

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