Spatiotemporal variation of drought conditions based on MODIS data over the source area of Yellow River

doi:10.7523/j.issn.2095-6134.2019.02.005

Abstract

Abstract: To determine the drought situation over the source area of Yellow River (SAYR) and to analyze the spatiotemporal patterns, the moderate resolution imaging spectroradiometer (MODIS) products, including MOD11A2(8-day land surface temperature)and MOD13A2(16-day vegetation index)in 1 km resolution, were used to obtain the temperature-vegetation drought index (TVDI) over a 10-year period from 2007 to 2016. The results are given as follows. 1) Significant correlation coefficient of 0.7 occurred in the linear fitting between TVDI and in-situ soil moisture measurements, indicating that TVDI could be recognized as an effective drought indicator over the SAYR for monitoring drought. 2) The average TVDI value over the whole study area ranged between 0.4 and 0.6 within the study period, showing a normal condition by drought classification standard. However, the southeastern region revealed various drought conditions. Moreover, grassland in different vegetation coverages in the past 10 years had serious drought conditions. Medium and low vegetation-covered areas showed the similar trend with the TVDI value varying from 0.6 to 1. Severe drought in high vegetation-covered regions was alleviated compared to those with low vegetation coverage. 3) The spatial variation of drought was significant. Severe drought occurred mostly in the northeastern and southeastern regions. The distribution trend basically corresponded to the fact that the overall soil water content in central and western regions was adequate while the regions with severe drought mainly distributed in the northeastern and southeastern regions.

Key words: the source area of Yellow River, MODIS, LST, NDVI, TVDI

CLC Number:

TP722.5

LIU Xin, SONG Xiaoning, LENG Pei, XIA Long. Spatiotemporal variation of drought conditions based on MODIS data over the source area of Yellow River[J]. , 2019, 36(2): 178-187.

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