Working Paper Article Version 1 This version is not peer-reviewed

Evaluation and Analysis of Soil Temperature Data over Poyang Lake Basin, China

Version 1 : Received: 23 February 2020 / Approved: 24 February 2020 / Online: 24 February 2020 (01:38:30 CET)

How to cite: Zhan, M.; Xia, L.; Zhan, L.; Wang, Y. Evaluation and Analysis of Soil Temperature Data over Poyang Lake Basin, China. Preprints 2020, 2020020335 Zhan, M.; Xia, L.; Zhan, L.; Wang, Y. Evaluation and Analysis of Soil Temperature Data over Poyang Lake Basin, China. Preprints 2020, 2020020335

Abstract

Soil temperature reflects the impact of local factors,such as vegetation,soil and the atmosphere of a region. Therefore, it is important to understand the regional variation of soil temperature. However, lack of observations with adequate spatial and/or temporal coverage, it would be difficult to use the observation data to study the regional variation. Based on the observation data from Nanchang and Ganzhou stations and ERA-Interim/Land reanalysis data, this study analyzed the temporal-spatial distribution characteristics of soil temperature over Poyang Lake Basin. The results showed close correlations between observation data and reanalysis data at different depths. Reanalysis data could mainly reproduce the temporal-spatial distributions of soil temperature over the Poyang Lake Basin, but generally underestimate their magnitudes. Temporally, there is an obvious warming trend in the basin. Seasonally, the temperature raised fastest in spring and slowest in summer, except for the ST4, which rising fastest in spring and slowest in winter. In terms of depths, the temperature of ST1 rises fastest. For the other layers, the warming trend is almost similar. An abrupt change of annual soil temperature at all depths occurred in 1997, and annual soil temperatures at all depths were abnormally low in 1984. Spatially, annual soil temperature decreased with latitude, except for the summer ST1. Because of the high temperature and precipitation in summer, the ST1 are higher around the lake and the river. The climatic trend of soil temperature presents the general increase trend from south to north, opposite to the distribution of soil temperature. The findings provide a basis for understanding and assessing the variation of the soil temperature over the Poyang Lake Basin.

Subject Areas

soil temperature; data evaluation; climatology; interannual variation; Poyang Lake Basin

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