Preprints
https://doi.org/10.5194/nhess-2021-73
https://doi.org/10.5194/nhess-2021-73

  31 Mar 2021

31 Mar 2021

Review status: this preprint is currently under review for the journal NHESS.

Drought evolution characteristics of the Qinghai-Tibet Plateau over the last 100 years based on SPEI

Shengzhen Wang1, Fenggui Liu1,2, Qiang Zhou1, Qiong Chen1, Baicheng Niu1, and Xingsheng Xia1 Shengzhen Wang et al.
  • 1College of Geographical Sciences, Qinghai Normal University, Xining, 811600, China
  • 2Academy of Plateau Science and Sustainability, Xining, 811600, China

Abstract. The standardized precipitation evapotranspiration index (SPEI) of the Tibetan Plateau was calculated using the CRU4.03 gridded dataset from 1901 to 2018 in this paper. Then, based on the SPEI data, drought on the Qinghai-Tibet Plateau was studied in terms of its spatial and temporal distributions and its changing characteristics over the last 100 years. The results revealed that the precipitation in the southeastern part of the Qinghai-Tibet Plateau has been steadily rising over the last 100 years, in conjunction with only minor temperature shifts. In the northwestern part of the plateau, precipitation has decreased significantly, accompanied by a significant increase in temperature. The drought on the Tibetan Plateau showed a clear gradual increase in aridity from southeast to northwest over the last hundred years. The SPEI also showed distinct seasonal patterns, steadily increasing in spring and summer and decreasing significantly in autumn and winter. In addition, each season had its own spatial characteristics. The northeastern part of the plateau, except the Qaidam Basin, showed a significant aridity trend in all seasons. A wet trend prevailed in the southeastern and southern areas. Drought on the Tibetan Plateau exhibits apparent cyclical oscillations with a main period of 54 years and has different cyclical characteristics in different seasons.

Shengzhen Wang et al.

Status: open (until 12 May 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Shengzhen Wang et al.

Shengzhen Wang et al.

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Short summary
The drought on the Qinghai-Tibet Plateau was studied in terms of its spatial and temporal distributions and its changing characteristics over the last 100 years in this paper. The drought on the plateau showed a clear gradual increase in aridity from southeast to northwest over the last 100 years. Besides, drought on the plateau exhibits apparent cyclical oscillations with a main period of 54 years and has different cyclical characteristics in different seasons.
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