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冰川冻土 ›› 2019, Vol. 41 ›› Issue (6): 1441-1447.doi: 10.7522/j.issn.1000-0240.2019.0011

• 寒旱区水文水资源 • 上一篇    下一篇

1979-2016年我国东北地区空中水汽状况及变化趋势分析

柏睿1,2, 李韧1, 吴通华1, 杜宜臻1,2   

  1. 1. 中国科学院 西北生态环境资源研究院 冰冻圈科学国家重点实验室 青藏高原冰冻圈观测研究站, 甘肃 兰州 730000;
    2. 中国科学院大学, 北京 100049
  • 收稿日期:2018-08-15 修回日期:2019-02-11 出版日期:2019-12-25 发布日期:2020-02-28
  • 作者简介:柏睿(1993-),女,黑龙江齐齐哈尔人,2012年在成都信息工程大学获学士学位,现为中国科学院西北生态环境资源研究院在读硕士研究生,从事多年冻土与气候方面的研究.E-mail:bairui1266@126.com
  • 基金资助:
    国家自然科学基金面上项目(41671070);国家自然科学基金重大项目(41690142);国家自然科学基金面上项目(41771076);国家自然科学基金创新群体项目"冰冻圈与全球变化"(41421061)资助

Air moisture condition and change trend in Northeast China, 1979-2016

BAI Rui1,2, LI Ren1, WU Tonghua1, DU Yizhen1,2   

  1. 1. Cryosphere Research Station on the Qinghai-Tibetan Plateau, State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2018-08-15 Revised:2019-02-11 Online:2019-12-25 Published:2020-02-28

摘要: 水汽是形成云和降水的物质基础,与全球水分循环和能量平衡密切相关,对天气和气候具有重要影响。基于NCEP/NCAR月值再分析资料,综合分析我国东北地区上空不同高度层位比湿的气候学特征和长期趋势变化,同时分析了整层积分水汽通量的季节变化。结果表明:东北地区空中水汽集中分布于500 hPa以下,1979年至20世纪末低层比湿呈增加趋势,2000年后转为缓慢下降,但2012年以来波动回升。此外,东北地区比湿及水汽通量季节差异明显,夏季水汽含量最多,冬季最少,秋季多于春季;东北地区水汽含量最大值出现于7月,最低值出现在每年12月至次年1月。水汽来源受东亚季风系统影响明显,夏季水汽源地主要为南海,渤海和黄海对东北地区夏季水汽也有一定贡献;其他季节水汽主要来源于西风带输送。

关键词: 东北地区, 比湿, 水汽通量, 变化趋势

Abstract: The water vapor in atmosphere is the material basis for formation of clouds and precipitation. It is closely related to the global water cycle and energy balance, and has an important impact on climate and weather. In this study, based on monthly reanalysis grid points (2.5°×2.5°) data within 1979-2016 from the NCEP/NCAR, the specific humidity, water vapor flux at 1 000 hPa of Northeast China are taken as the research object, quantitative at 1 000 hPa, 850 hPa, 700 hPa and 500 hPa. Based on the reanalysis of monthly NCEP/NCAR data, in this study, the climatic characteristics and long-term trend change of specific humidity at different altitudes over Northeast China have been comprehensively analyzed, as well as the seasonal changes of integrated water vapor flux. The results show that the vertical distribution characteristics of water vapor in Northeast China are that the water vapor content began to drop from 500 hPa level, the higher the elevation the lower the water vapor content. The specific humidity in Northeast China had showed an overall downward trend from 1979 to 2000. After 2000, an ascending trend has been seen. Spatially, in Northeast China there is a latitude effect significantly, the water vapor content is mainly concentrated in the south. In a year round the water vapor content in Northeast China is the maximum in July and the minimum is between December and January of next year. The sources of summer water vapor are mainly from the South China Sea, followed by the Bohai Sea and the Yellow Sea. In other seasons, westerly wind is the main source of water vapor.

Key words: Northeast China, specific humidity, water vapor flux, variation tendency

中图分类号: 

  • P339