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Inconsistencies of precipitation in the eastern and central Tibetan Plateau between surface adjusted data and reanalysis

机译：地表调整资料与再分析之间青藏高原东部和中部的降水不一致

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摘要

The Tibetan Plateau (TP) is the source of many Asian river systems and serves as "the Asian water tower". Precipitation variability is a strong component of both hy-drological processes and energy cycles, and the study of precipitation in the TP is of great importance in the content of global warming. In this study, the annual and seasonal (spring: MAM; summer: JJA; autumn: SON; and winter: DJF) variations in precipitation are investigated in the eastern and central TP during 1961-2007, based on surface raw and adjusted observations as well as both NCEP/NCAR (1961-2007) and ERA-40 (1961-2001) reanalyses. The adjusted precipitation in the TP is higher than raw values on both the annual and seasonal basis due to adjustments of solid precipitation by a bias experiential model. At the annual spring and winter scales, the adjusted precipitation shows a significant increase calculated by the Mann-Kendall trend test. Compared with adjusted precipitation; both NCEP/NCAR and ERA-40 reanalyses capture the broad spatial distributions of mean annual and seasonal precipitation, but are less good at repeating the decadal variability. Both reanalyses show the drying phenomena in most regions and fail to represent the change patterns of precipitation observed by the adjusted observations. Both NCEP/NCAR and ERA-40 have larger inconsistencies which may be caused by the differences between actual and model topography. This suggests that it is crucial to use the adjusted precipitation in the climate research and reanalysis products should be paid more attention in the TP.
机译：青藏高原（TP）是许多亚洲河流系统的源头，是“亚洲水塔”。降水变化是水力过程和能量循环的重要组成部分，而对TP中降水的研究对于全球变暖的内容具有重要意义。在这项研究中，根据地表原始资料和调整后的观测值，对1961-2007年东部和中部TP的降水和季节变化进行了调查（春季：MAM；夏季：JJA；秋季：SON；冬季：DJF）。以及NCEP / NCAR（1961-2007）和ERA-40（1961-2001）的重新分析。由于偏见经验模型对固体降水量的调整，TP的调整后的降水量在年度和季节均高于原始值。在每年的春季和冬季尺度上，通过Mann-Kendall趋势检验计算得出的调整后的降水量显着增加。与调整后的降水量相比； NCEP / NCAR和ERA-40的再分析都捕获了平均年降水量和季节降水的广泛空间分布，但不太擅长重复年代际的变化。两次再分析都显示出大多数区域的干燥现象，并且不能代表通过调整后的观测所观察到的降水变化模式。 NCEP / NCAR和ERA-40都有较大的不一致，这可能是由实际和模型形貌之间的差异引起的。这表明在气候研究中使用调整后的降水量至关重要，并且在TP中应更加关注再分析产品。

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  • 来源
    《Theoretical and applied climatology》 |2012年第4期|p.485-496|共12页
  • 作者

    Qinglong You; Klaus Fraedrich; Guoyu Ren; Baisheng Ye; Xianhong Meng; Shichang Kang;

  • 作者单位

    Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences (CAS), Beijing 100085, China,Meteorological Institute, KlimaCampus, University of Hamburg, Hamburg 21044, Germany,Laboratory for Climate Studies, National Climate Center, China Meteorological Administration (CMA), Beijing 100081, China;

    Meteorological Institute, KlimaCampus, University of Hamburg, Hamburg 21044, Germany;

    Laboratory for Climate Studies, National Climate Center, China Meteorological Administration (CMA), Beijing 100081, China;

    State Key Laboratory of Cryospheric Science, CAS, Lanzhou 730000, China;

    Key laboratory of Land Surface Process and Climate Change in Cold and Arid Regions, Cold and Arid Regions Environmental and Engineering Research Institute, CAS, Lanzhou 730000, China;

    Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences (CAS), Beijing 100085, China,State Key Laboratory of Cryospheric Science, CAS, Lanzhou 730000, China;

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