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Soil moisture controlled the variability of air temperature and oasis effect in a large inland basin in arid region
  • Xingming Hao,
  • Haochao Hao,
  • Jingjing Zhang
Xingming Hao
Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences
Author Profile
Haochao Hao
Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences
Author Profile
Jingjing Zhang
Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences
Author Profile

Abstract

Soil moisture plays a significant role in land-atmosphere interactions. Changing fractions of latent and sensible heat fluxes caused by soil moisture variations can affect near-surface air temperature, thus influencing the cooling effect of the oasis in arid regions. In this study, the framework for the evaporative fraction (EF) dependence on soil moisture is used to analyze the impacts of soil moisture variation on near-surface air temperature and the oasis effect. The results showed that the contribution rate of soil moisture to EF was significantly higher than that of EF to temperature. Under the interaction of temperature sensitivity to EF and EF to soil moisture, the ∂T/∂ϴ presented a similar tempo-spatial variation with both of the above. It was most significant in oasis areas during summer (−1.676), while it was weaker in plain desert areas during the autumn (−0.071). In the study region, the effect of soil moisture variation on air temperature can reach 0.018–0.242 K for different land-cover types in summer. The maximum variation of soil moisture in summer can alter air temperature by up to 0.386 K. The difference in temperature variability between the oasis and desert areas promoted the formation of the oasis effect. For different oasis, the multi-year average oasis cold effect index (OCI) ranged from −1.36 K to −0.26 K, while average summer OCI ranged from −1.38 K to −0.29 K. The lower bound of the cooling effect of oasis ranged from −4.97 to −1.69 K. The analysis framework and results of this study will provide a new perspective for further research on the evolution process of the oasis effect and water-heat balance in arid areas.

Peer review status:ACCEPTED

09 Nov 2020Submitted to Hydrological Processes
11 Nov 2020Submission Checks Completed
11 Nov 2020Assigned to Editor
11 Nov 2020Reviewer(s) Assigned
24 Jan 2021Review(s) Completed, Editorial Evaluation Pending
26 Jan 2021Editorial Decision: Revise Major
09 Mar 20211st Revision Received
09 Mar 2021Assigned to Editor
09 Mar 2021Submission Checks Completed
09 Mar 2021Reviewer(s) Assigned
12 Apr 2021Review(s) Completed, Editorial Evaluation Pending
18 Apr 2021Editorial Decision: Revise Major
08 May 20212nd Revision Received
10 May 2021Reviewer(s) Assigned
10 May 2021Submission Checks Completed
10 May 2021Assigned to Editor
14 May 2021Review(s) Completed, Editorial Evaluation Pending
14 May 2021Editorial Decision: Accept