Warm Season Trends of ETa: A Case Study of Near-North Caspian Low Lands
Actual evapotranspiration (ETa) has a very important significance for hydrological and environmental purposes balance in arid and semi-arid areas. MOD16 product was applied to estimate seasonal ETa trends for 2000–2009 time period, in the Pallasovsky District of Volgograd Region, South-East of the European part of Russia. The result of time series computing by Mann-Kendall test code indicated that ETa in this study region decreased during the analyzed period. The speed value of this process gradually varies from 4.7 mm/year in the southern part with about 240 mm of annual average ETa to 17.3 mm/year in the northern part with about 375 mm of annual average ETa. Analysis of the seasonal spatial distribution of ETa trend over the study region shows that it is influenced by changes of precipitation during warm seasons, and as a consequence, by land cover degradation due to farming system changes.
KeywordsPre-North Caspian region Evapotranspiration Time series Mann-Kendall test Trend analysis Spatial distribution
Authors express their gratitude to the Russian Foundation for Basic Research for providing financial support to the project 16-05-01097.
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