Applicability of GLDAS and Climate Change in the Qinghai-Xizang Plateau and Its Surrounding Arid Area

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Plateau Meteorology
Plateau Meteorology ›› 2013, Vol. 32 ›› Issue (3) : 635. DOI: 10.7522/j.issn.1000-0534.2013.00054

Applicability of GLDAS and Climate Change in the Qinghai-Xizang Plateau and Its Surrounding Arid Area

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Abstract

Some researches show that the hydrological cycle in the Qinghai-Xizang Plateau and its surrounding arid area is particularly sensitive to global climate change. Due to the observations of evaporation and runoff are sparse,  the hydrological cycle change in the study area is certainly limited. Based on the observation driving data, Global Land Data Assimilation System (GLDAS) represents the regional distribution of surface hydrological cycle element, and also give support to the study of regional scale of hydrological cycle change. Firstly, the four climatic regions are divided the Qinghai-Xizang Plateau and its surrounding arid area, the variation characteristics of temperature and rainfall in each climate zone are analyzed. Then the suitability of temperature and precipitation data of GLDAS four land surface models in 1979-2007 is tested. Lastly the space variation of evaporation and runoff and the change of surface hydrological cycle key elements in different climate zones are discussed. The results show that the average temperature of four climate regions in 2000-2007 and 1979-1994 ranging from 0.65 to 0.97  ℃, and grew obviously. Precipitation changes differently, mean of which in arid and semi-arid area in 2000-2007 is more than 14 mm and 25 mm in 1979-1994. GLDAS temperature and precipitation data have high applicability in the Qinghai-Xizang Plateau and its surrounding arid area in 1979-1994. The root-mean-square error beteen GLDAS temperature data and Chinese surface grid temperature data in extreme arid area is only 0.41 ℃. The differences beteen GLDAS data and APHRODITE precipitation data in four climate region are all less than 0.18 mm·d-1. The water cycle in study area is in dynamic balance during the research period. But the data quality of 2000-2007 has yet to be improved. Runoff and evaporation increasing area grew significantly, and the amplitude have risen sharply, but changing magnitude is uncertain. The change characteristics of hydrological cycle key elements in most areas of Xinjiang Province are consistent with the scientific hypothesis of climatic shift from warm-dry to warm-humid previous proposed. The precipitation of this area is mainly used for evaporation. In the recent years,  the hydrological cycle is strengthened. Multi-year average runoff coefficient are less than 0.2.

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Land assimilation da / Qinghai-Xizang Plate / Hydrological cycle

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. Applicability of GLDAS and Climate Change in the Qinghai-Xizang Plateau and Its Surrounding Arid Area. Plateau Meteorology. 2013, 32(3): 635 https://doi.org/10.7522/j.issn.1000-0534.2013.00054

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