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基于GLDAS产品的青藏高原土壤湿度特征分析

邓明珊1,2孟宪红1,2马英赛1,2安颖颖1,2   

  1. 1.中国科学院西北生态资源环境研究院,中国科学院寒旱区陆面过程与气候变化
    重点实验室,甘肃兰州730000;2.中国科学院大学,北京100049
  • 出版日期:2018-09-04 发布日期:2018-09-04
  • 作者简介:邓明珊(1994— ),女,主要从事陆面过程与气候变化研究. E-mail:dengmingshan1994@163.com。
  • 基金资助:

    国家自然科学基金项目(91437102,41375015)资助

Analysis on Soil Moisture Characteristics of Tibetan Plateau Based on GLDAS

DENG Mingshan 1,2, MENG Xianhong 1,2, MA Yingsai 1,2, AN Yingying 1,2   

  1. 1.Northwest Institute of Eco- Environment and Resources, Chinese Academy of Sciences,
    Key Laboratory of Land Surface Process and Climate Change
    in Cold and Arid Regions of Chinese Academy of Sciences,Lanzhou 730000,China;
    2. University of Chinese Academy of Sciences,Beijing 100049,China
  • Online:2018-09-04 Published:2018-09-04

摘要:

选取青藏高原中部那曲地区10个试验点2010年8月至2012年12月的土壤湿度数据与全球陆面数据同化系统(GLDAS)中4个陆面过程模型(NOAH、CLM、VIC、MOSAIC)模拟得到的土壤水分产品进行对比分析,发现NOAH陆面模式资料在青藏高原适用性较好。采用中国科学院青藏高原研究所那曲站10个试验点观测土壤湿度资料和长时间序列的GLDAS陆面模式资料研究青藏高原地区不同深度土壤湿度的时空分布特征。结果表明:那曲地区土壤湿度呈现显著的季节变化特征,一年之中出现两个峰值和两个低值阶段。基于NOAH陆面数据同化产品发现青藏高原土壤湿度的空间分布呈现明显的纬向分布特征,随纬度的升高,土壤湿度值降低;同时,青藏高原中部浅层土壤和中间层土壤湿度有变湿的趋势。0~10 cm、10~40 cm、40~100 cm土壤湿度EOF展开第一模态(EOF1)在高原北部及南部呈反位相分布。

关键词: 土壤湿度, 青藏高原, GLDAS, 时空分布

Abstract:

In this paper, the soil moisture data from ten test sites in the Naqu region of the central Tibetan Plateau from August 2010 to December 2012 were compared with four sets of GLDAS (global land data assimilation system) products (NOAH, CLM, VIC, MOSAIC) and it was found that NOAH land surface model data has good applicability in the Tibetan Plateau. The spatial and temporal distribution characteristics of soil moisture at different depths in the Tibetan Plateau were studied using the soil moisture data from observations and the GLDAS land surface model data over a long period of time. The results show that the soil moisture in Naqu showed a significant seasonal variation with two peaks and two low-value phases in one year. Based on the NOAH land surface data assimilation product, the spatial distribution of soil moisture in the Tibetan Plateau presented obvious zonal distribution characteristics. With the increase of latitude, the soil moisture decreased. At the same time, the humidity in the shallow soil and the middle layer in the central Tibetan Plateau tended to become wetter. EOF1 spatial pattern of soil moisture at the depth of 0-10 cm, 10-40 cm, 40-100 cm showed the north-south antiphase variation.

Key words: soil moisture, Tibetan Plateau, GLDAS, spatial and temporal distribution

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