Plateau Meteorology

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2020 , Vol. 39 >Issue 3: 499 - 510

DOI: https://doi.org/10.7522/j.issn.1000-0534.2020.00013.

Analysis of Precipitation Recycling Ratio Based on GLDAS and Reanalysis Data over the Qinghai-Tibetan Plateau

  • Yu XU ,
  • Yanhong GAO
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  • <sup>1.</sup>Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China;<sup>2.</sup>University of Chinese Academy of Sciences, Beijing 100049, China;<sup>3.</sup>Department of Atmospheric and Oceanic Sciences & Institute of Atmospheric Sciences Fudan University, Shanghai 200438, China

Received date: 2019-11-28

  Online published: 2020-06-28

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Abstract

Precipitation recycling ratio is the local evaporation that contributes to the local precipitation.It is an indication of land-atmosphere interaction over the Qinghai-Tibetan Plateau (QTP).This study was based on the Global Land Data Assimilation Systems (GLDAS) and the ERA-Interim (ERAI) data by using the Quasi-isentropic backward trajectory (QIBT) model.The study used the precipitation and evaporation from the GLDAS and other variables from the ERAI data to run the QIBT model.The precipitation recycling ratio was analyzed in 2001, a climatological averaged precipitation year.To evaluate the influence of the precipitation and evaporation to the results of precipitation recycling ratio, two tests were applied.One is to replace the precipitation and evaporation from the GLDAS with that from the ERAI.After the precipitation and evaporation in the GLDAS were replaced with that in the ERAI, the influence of the replacement was evaluated.Another is to replace the precipitation and evaporation in 2001 with that in extreme wet and dry years during 1982 -2011 (30 years).The variations of precipitation recycling ratio in extreme wet and dry year were also evaluated.The results are as follows: Precipitation recycling ratio in the northwest is stronger than that in the southeast over the QTP.The average precipitation recycling ratio is 0.42 over the QTP with the precipitation and evaporation from the GLDAS.Precipitation recycling ratio in some regions in the northern part of the QTP is larger than 0.50.Precipitation recycling ratio is 0.28 when the precipitation and evaporation in the GLDAS were replaced with the precipitation and evaporation in the ERAI.Precipitation recycling ratio is 0.31 for extreme dry year and 0.25 for extreme wet year.Precipitation recycling ratio is stronger in the extreme dry year than in the extreme wet year.The influence of replacement from GLDAS to ERAI is larger than that of replacement from normal year to extreme years.The higher precipitation in the ERAI than the GLDAS is the reason for the lower precipitation recycling ratio for the ERAI.Apparently, precipitation overestimation is responsible for the underestimation of precipitation recycling ratio in the ERAI.The deeply reason is that hourly precipitation in the ERAI is different from that in the GLDAS.ERAI underestimates the small and medium rainfall events, and overestimates the heavy rainfall events at the same time.In conclusion, the accuracy of precipitation is the most important factor in the study of the precipitation recycling ratio over the Tibetan Plateau.

Key words： Qinghai-Tibetan Plat; precipitation recycl; GLDAS; ERA-Interim; precipitation

Cite this article

Yu XU , Yanhong GAO . Analysis of Precipitation Recycling Ratio Based on GLDAS and Reanalysis Data over the Qinghai-Tibetan Plateau[J]. Plateau Meteorology, 2020 , 39(3) : 499 -510 . DOI: 10.7522/j.issn.1000-0534.2020.00013.

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