| 利用多种再分析资料对比分析青藏高原夏季大气水汽含量变化情况 |
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| 引用本文： | 陈丹,周长艳,邓梦雨.利用多种再分析资料对比分析青藏高原夏季大气水汽含量变化情况[J].高原山地气象研究,2018,38(3):1-6. |
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| 作者姓名： | 陈丹 周长艳 邓梦雨 |
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| 作者单位： | 1. 中国气象局成都高原气象研究所, 成都 610072; |
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| 基金项目： | 成都高原研究所基本科研费业务费项目(BROP201813)高原大气与环境四川省重点实验室开放课题(PAEKL-2018-C4) |
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| 摘 要： | 利用ERA-Interim、MERRA和NCEP/NCAR三套再分析资料,分析1979~2014年夏季青藏高原大气水汽含量的时空变化特征,同时对比了各套资料异同点,结果表明:(1) ERA-Interim和MERRA资料均显示出夏季青藏高原大气水汽含量呈现显著的上升趋势,在1994~1995年前后发生明显突变,大气水汽含量由偏低时期向偏高时期转变;而NCEP/NCAR资料并没有出现类似的显著上升趋势和突变年份;ERA-Interim资料与MERRA资料的夏季青藏高原湿池指数之间的相关性明显强于NCEP/NCAR资料与它们任何一个之间的相关性。(2)夏季青藏高原大气水汽含量呈现出自高原东南边缘地区向西北部递减的分布形式。其中,MERRA与ERA-Interim资料显示的水汽含量分布更为相似,而NCEP/NCAR资料反映的水汽含量在高原中部往北递减不明显,湿度中心较为分散。(3)从空间分布上,MERRA与ERA-Interim资料显示青藏高原大部分地区夏季水汽含量均呈显著的增加趋势,而NCEP/NCAR资料仅在高原东北部小部分区域存在显著的增加趋势。(4)从夏季青藏高原大气水汽含量的年际变化特征分析来看,ERA-Interim和MERRA资料相对于NCEP/NCAR资料也更为接近。
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| 关 键 词： | ERA-Interim资料 MERRA资料 NCEP/NCAR资料 青藏高原 大气水汽含量 |
| 收稿时间： | 2018-07-18 |
A Comparison Analysis of Three Reanalysis Datasets in the Change of Atmospheric Water Vapor Content in the Summer of the Tibetan Plateau |
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| Institution: | 1. Chengdu Institute of Plateau Meteorology, CMA, Chengdu 610072, China;2. Heavy Rain and Drought-Flood Disasters in Plateau and Basin Key Laboratory of Sichuan Province, Chengdu 610072, China |
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| Abstract: | Based on ERA-Interim, MERRA and NCEP/NCAR reanalysis datasets, the spatial and temporal variations of atmospheric water vapor content in Tibetan plateau from 1979 to 2014 were discussed. Comparison and performance analyses of these three reanalysis data were given. The obtained results are as follows. (1) The atmospheric water vapor content in Tibetan plateau in summer had presented significant upward trend by ERA-Interim and MERRA reanalysis datasets. There was a significant mutation in about 1994 to 1995, the change of atmospheric water vapor content from the low period to the high period. The NCEP/NCAR data did not show a similar significant upward trend or any significant mutation year. The correlation between the ERA-Interim data and the MERRA data of the wet pool index in the summer of the Tibetan Plateau was stronger than the correlation between that of the NCEP/NCAR data and each of them. (2) In the summer, the atmospheric water vapor content in the Tibetan Plateau presented a decreasing distribution from the southeast to the northwest of the plateau. However, the atmospheric water vapor content distribution which shown by the MERRA data and ERA-Interim data were more similar, and NCEP/NCAR data reflect the decline of the atmospheric water vapor content in the middle of the plateau was not obvious, the center of the humidity is more dispersed. (3) MERRA data and ERA-Interim data show that the atmospheric water vapor content in most parts of the Tibetan Plateau in summer showed a significant increase trend, while the NCEP/NCAR data only in the northeast part of the plateau had a significant increase trend. (4) From the analysis of the characteristics of the interannual variation of atmospheric water vapor over the Tibetan Plateau in summer, compared with the NCEP/NCAR data, ERA-Interim data and MERRA data were more close to each other. |
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