Publications

Pan, X; Liu, SY; Tansey, K; Fan, XW; Yang, Z; Yuan, J; Wang, ZC; Yang, YB; Liu, YB (2023). Spatio-temporal variation of evapotranspiration and its linkage with environmental factors in the largest freshwater lake wetland in China. JOURNAL OF HYDROLOGY-REGIONAL STUDIES, 47, 101424.

Abstract
Study region: Poyang lake wetland Study focus: Evapotranspiration (ET) is a critical parameter in the hydrologic and energy budget, and it is important for understanding spatio-temporal variations in ET in large lake wetlands. Monthly ET in the Poyang Lake wetland during 2008-2017 was estimated by the remote sensing ET retrieval model based on a Nonparametric approach (RS-NP). And the spatio-temporal variation of ET and the influencing factors were analyzed. New hydrological insights for the region: The validation revealed the usefulness of the RS-NP model in a moist region and yielded a relative error of 6 % (12 %) in the wet (dry) season. Temporally, the average yearly ET was 884 mm with ET/P (precipitation) of 55 %-65 %. The monthly ET/P ratio increased significantly from 40 %-50 % from January to May to 90 %-130 % from July to October. ET in June was lower by over 20 % than that in May and July with the lowest ET/P value (33 %). Spatially, relatively larger and lower ET occurred in the northern and southern parts, respectively. The main factors affecting ET variability were downwelling shortwave radiation (similar to 2/3 contribution) and water area (similar to 1/3 contribution) at the monthly scale. Precipitation and surface temperature dominantly controlled the hysteresis effects with a lag of one month and regulated LE monthly variations. This study improves our understanding of complicated water atmosphere interactions and their linkages with environmental factors in large lake systems.

DOI:
10.1016/j.ejrh.2023.101424

ISSN:
2214-5818