COMPARISON OF ACTUAL EVAPOTRANSPIRATION FROM ALEXI AND SOILCLIM MODELS

0521245 - ÚVGZ 2020 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Jurečka, František - Hlavinka, Petr - Lukas, Vojtěch - Trnka, Miroslav - Anderson, M. - Hain, C. - Balek, Jan - Bláhová, Monika - Žalud, Zdeněk
COMPARISON OF ACTUAL EVAPOTRANSPIRATION FROM ALEXI AND SOILCLIM MODELS.
PROCEEDINGS OF 24TH INTERNATIONAL PHD STUDENTS CONFERENCE (MENDELNET 2017). Brno: Mendelova univerzita, 2017 - (Cerkal, R.; Belcredi, N.; Prokesova, L.; Vacek, P.), s. 70-75. ISBN 978-80-7509-529-9.
[24th International PhD Students Conference for Undergraduate and Postgraduate Students (MendelNet). Brno (CZ), 08.11.2017-09.11.2017]
Institucionální podpora: RVO:86652079
Klíčová slova: fluxes * evapotranspiration * drought * remote sensing * land surface temperature * water balance
Obor OECD: Meteorology and atmospheric sciences

Actual evapotranspiration (ETa) determined by the Atmosphere-land Exchange Inverse (ALEXI) model and water balance model SoilClim was compared for selected districts of the Czech Republic. The ALEXI model uses the land surface temperature (LST) from remote sensing and provides information on ETa and subsequently the surface moisture status. The SoilClim is a dynamic model of watcr content in soil and represents a model based on water balance approach. The current version of the model is able to estimate the value of ETa, as well as soil moisture content in two layers of the soil profile. Investigated period of ETa comparison were years 2014 and 2015. Especially the year 2015 had a special relevance due to the significant summer drought that occurred in CR. Model performance was compared for the period when changes in vegetation are most significant from April to August. Week sums of ETa from both models were compared at the district level for Vysodina, JihomorayskY and Olomouck, regions. The ETa values were generally higher from ALEXI as compared to SoilClim. ALEXI values were in some cases even two or three time higher. Moreover, the seasonal dynamics showed sometimes opposite trends. As this is a pilot testing of ALEXI based ETa in the conditions of Central Europe and show large differences as compared to well established methods, more detailed testing is required prior drawing any general conclusions.
Trvalý link: http://hdl.handle.net/11104/0305871