湖北农业科学 ›› 2025, Vol. 64 ›› Issue (1): 23-27.doi: 10.14088/j.cnki.issn0439-8114.2025.01.004

• 资源·环境 • 上一篇    下一篇

基于遥感与同化数据的干旱特征与水循环要空演变特征

刘艳群1,2, 王敏1,2, 黄观荣1,2, 李丽芳1,2, 李曹明2,3   

  1. 1.广东省韶关市气象局,广东 韶关 512028;
    2.南岭生态气象与卫星遥感应用工程技术研究中心,广东 韶关 512028;
    3.仁化县气象局,广东 仁化 512300
  • 收稿日期:2024-09-06 发布日期:2025-02-20
  • 作者简介:刘艳群(1974-),女,广东南雄人,副研级高级工程师,硕士,主要从事生态与农业气象、卫星遥感应用、气候预测研究,(电话)13927849222(电子信箱)SGlyq1107@163.com。
  • 基金资助:
    韶关市科学技术局项目(230616148033947)

Drought characteristics and spatio-temporal evolution characteristics of water cycle factors based on remote sensing and assimilation data

LIU Yan-qun1,2, WANG Min1,2, HUANG Guan-rong1,2, LI Li-fang1,2, LI Cao-ming2,3   

  1. 1. Shaoguan Bureau of Meteorology of Guangdong Province, Shaoguan 512028, Guangdong, China;
    2. Nanling Ecological Meteorology and Satellite Remote Sensing Application Engineering Technology Research Center, Shaoguan 512028, Guangdong, China;
    3. Renhua Bureau of Meteorology, Renhua 512300, Guangdong, China
  • Received:2024-09-06 Online:2025-02-20

摘要: 基于全球陆地数据同化系统中数据,对温度植被干旱指数进行了改进,在此基础上对干旱特征进行分析,并选取蒸散发量、地下水径流量、降水量和土壤储水量4种同化数据作为水循环要素,利用小波变换进行水循环要素的时空演变分析。结果表明,改进后的温度植被干旱指数(TVDI)与土壤含水量数据的相关性得到了提高。除个别气候区外,TVDI与土壤湿度的相关性均在土壤深度为0~10 cm时最高。除西北荒漠地区和内蒙古草原外,TVDI与土壤湿度在暖季的相关性均高于冷季。中国的年降水量集中在600~700 mm,年蒸散发量在500 mm以下。中国的年地下水径流量在100~250 mm,年土壤储水量在460~540 mm。西北荒漠地区、青藏高原和东北的年蒸散发量和年降水量呈显著增长趋势,西北荒漠地区和东北的年土壤储水量和年地下水径流量呈显著减少趋势。

关键词: 干旱特征, 水循环要素, 时空演变, 遥感, 同化数据, 温度植被干旱指数

Abstract: Based on the Global Land Data Assimilation System as the data source, the temperature vegetation drought index was improved. On this basis, the drought characteristics were analyzed. The four assimilation data including evapotranspiration, groundwater runoff, precipitation and soil water storage were selected as water cycle elements, and the spatio-temporal evolution of water cycle elements was analyzed using wavelet transform. The results showed that the correlation between the improved temperature vegetation drought index(TVDI) and soil moisture data had been improved. When the soil depth was between 0 cm and 10 cm, the correlation between TVDI and soil moisture was the highest except for individual climatic regions. The correlation between TVDI and soil moisture in the warm season was better than that in the cold season except for the Northwest Desert region and the Inner Mongolia grassland areas. The annual precipitation in China was concentrated between 600 mm and 700 mm, with evapotranspiration below 500 mm. The annual groundwater runoff in China ranged from 100 mm to 250 mm, and the annual soil water storage capacity ranged from 460 mm to 540 mm. The annual evapotranspiration and annual precipitation in the Northwest Desert region,Tibetan Plateau and Northeast China showed a significant increase trend, and the annual soil water storage and annual groundwater runoff in the Northwest Desert region and Northeast China showed a significant downward trend.

Key words: drought characteristics, water cycle elements, spatio-temporal evolution, remote sensing, assimilating data, temperature vegetation drought index

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