CollectHomepage AdvertisementContact usMessage

Arid Land Geography ›› 2022, Vol. 45 ›› Issue (2): 456-466.doi: 10.12118/j.issn.1000–6060.2021.257

• Earth Surface Process • Previous Articles     Next Articles

Vegetation-water vapor-land surface temperature correlation analysis of typical deserts and oases in Xinjiang

CHENG Danni1(),WANG Yingqi1,CHENG Yongxiang1(),HUANG Jingfeng2   

  1. 1. College of Life Science, Shihezi University, Shihezi 832000, Xinjiang, China
    2. Institute of Agricultural Remote Sensing and Information Technology Application, Zhejiang University, Hangzhou 310058, Zhejiang, China
  • Received:2021-06-07 Revised:2021-09-29 Online:2022-03-25 Published:2022-04-02
  • Contact: Yongxiang CHENG E-mail:2105237429@qq.com;chengyongxiang613@163.com

Abstract:

To explore the correlation among the land surface temperature (LST), normalized difference vegetation index (NDVI), and atmospheric water vapor content in different regions of Xinjiang, China, the MOD13C3 NDVI and LST from 2001 to 2019 and Suomi NPP VIIRS water vapor content from 2013 to 2017 were used to study this problem using the slope trend analysis method. The results are as follows. (1) From 2001 to 2019, the annual average value of NDVI showed an overall increasing trend, especially in the oasis. The annual average change of LST is that the oasis decreases during the day and increases at night, and the annual temperature difference decreases. The desert LST increases during the day and night, and the annual temperature difference increases. (2) The monthly data of NDVI, atmospheric water vapor content, and LST are positively correlated. The increase in vegetation can reduce the surface temperature and atmospheric water vapor differences, which is obvious in the high vegetation coverage area of the oasis in northern Xinjiang. Oasis is better than the desert in regulating the ecological environment, and an oasis in northern Xinjiang is better than that in southern Xinjiang. (3) In the Taklimakan Desert, the surface temperature and humidity inversion are obvious at night from March to October every year, which lead to higher atmospheric water vapor content at night than during the day. Oasis of southern Xinjiang affected by desert environment and vegetation increase. The months when the water vapor content at night is higher than that during the day gradually decrease in recent years, mainly concentrated in summer. The research results are useful in understanding climate change from a macrolevel and providing a valuable reference for ecological environment protection in Xinjiang.

Key words: normalized difference vegetation index (NDVI), land surface temperature, atmospheric water vapor content, temperature inversion, wet inversion