高原气象

高原气象 >

2018 , Vol. 37 >Issue 2: 371 - 381

DOI: https://doi.org/10.7522/j.issn.1000-0534.2017.00074

论文

多套土壤湿度替代资料在青藏高原的适用性分析

  • 王静 ,
  • 祁莉 ,
  • 吴志伟 ,
  • 施晓晖 ,
  • 何金海
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  • 南京信息工程大学气象灾害预报预警与评估协同创新中心, 江苏 南京 210044;复旦大学大气科学研究院, 上海 200433;中国气象科学研究院, 北京 100081

收稿日期: 2017-07-12

  网络出版日期: 2018-04-28

基金资助

国家自然科学基金项目（91337216，41275050，91437216，91337108，41575075）；江苏高校优势学科建设工程资助项目（PAPD）；长江学者和创新团队发展计划（PCSIRT）；江苏省青蓝工程创新团队项目

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Applicability Analysis of Soil Moisture from Multiple Substitute Data in Qinghai-Tibetan Plateau

  • WANG Jing ,
  • QI Li ,
  • WU Zhiwei ,
  • SHI Xiaohui ,
  • HE Jinhai
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  • Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, Jiangsu, China;Fudan University, Shanghai 200433, China;Chinese Academy of Meteorological Sciences, Beijing 100081, China

Received date: 2017-07-12

  Online published: 2018-04-28

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摘要

目前，仍没有一套公认的能够很好的描述高原土壤湿度变化特征的替代资料，为此利用收集到的多套观测资料作为参考，分别对各种替代资料在高原的适用性进行了评估。结果表明：（1）观测资料表明，高原的土壤湿度在表层、中层、深层的变化具有较好的一致性，表层与中层、中层与深层的土壤湿度相关系数均在0.8以上。（2）卫星反演资料SSM/I RETRIEVALS在各个站点与观测值的相关系数都为正，在高原东南部、中部、北部相关系数都在0.5以上，且标准差与高原东南和中部的观测标准差较为接近，适用于高原的大范围地区，是研究青藏高原土壤湿度多年变化特征的一套较好的替代资料。（3）春季高原土壤湿度的空间分布具有南部边缘较大、由东南向西北递减的特征，大部分地区的土壤湿度具有明显的线性增加趋势；去除趋势后，高原东、西各有一个均方差大值区，东、西关键区内的土壤湿度从春到夏都具有较好的持续性，可以作为预测我国夏季降水的重要因子。

关键词： 青藏高原; 土壤湿度; 资料评估; 时空变化特征

本文引用格式

王静 , 祁莉 , 吴志伟 , 施晓晖 , 何金海 . 多套土壤湿度替代资料在青藏高原的适用性分析[J]. 高原气象, 2018 , 37(2) : 371 -381 . DOI: 10.7522/j.issn.1000-0534.2017.00074

Abstract

There is not any reliable long-time observed dataset to reflect the characteristics of soil moisture change, in this paper we comprehensively refer to several observation datasets, and assess the applicability of multiple substitute data to the Qinghai-Tibetan Plateau (QTP). The results show as following:(1) The observation dataset shows that the changes of the soil moisture in the surface, middle and deep layer have a good consistency, and the correlation coefficient between different layers are mostly above 0.8. (2) The SSM/I satellite retrieval dataset has a positive correlation with every site's observation data, as the correlation coefficients are all above 0.5 in the southeast, middle and north of QTP, and the standard deviations (SD) are both close to the observation SD in southeast and middle of QTP, so the SSM/I RETRIVALS should be a first-rate substitute data for studying the variation characteristics of soil moisture in QTP. (3) The spatial distribution of spring soil moisture in QTP is characterized by a large southern margin and a decline from southeast to northwest, and the general soil moisture of QTP has an obvious linearly increasing trend. After removing the linear trend, there are two large standard deviations areas in east and west QTP, and the soil moisture has great continuity from spring to summer in both areas which can be used to predict summer rainfall in China.

Key words： Qinghai-Tibetan Plat; soil moisture; data assessment; temporal and spatial

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