干旱气象 ›› 2024, Vol. 42 ›› Issue (2): 180-186.DOI: 10.11755/j.issn.1006-7639(2024)-02-0180

• 论文 • 上一篇    下一篇

基于NDVI-LST模型的四川攀西地区近20 a干旱演变特征

刘兴忠1,2(), 胡春1,2(), 何超1,2, 何国平3, 马骁4, 姜绪彬5   

  1. 1.四川省气象探测数据中心,四川 成都 610072
    2.高原与盆地暴雨旱涝灾害四川省重点实验室,四川 成都 610072
    3.四川省攀枝花市气象局,四川 攀枝花 617000
    4.四川省凉山州气象局,四川 凉山州 615000
    5.黑龙江省气象数据中心,黑龙江 哈尔滨 150000
  • 收稿日期:2023-07-21 修回日期:2023-11-23 出版日期:2024-04-30 发布日期:2024-05-12
  • 通讯作者: 胡春(1974—),男,四川成都人,高级工程师,主要从事大气探测及气象探测数据挖掘方面的研究。E-mail: 349430433@qq.com
  • 作者简介:刘兴忠(1984—),男,四川成都人,硕士,高级工程师,主要从事大气探测及气象探测数据挖掘方面的研究。E-mail: liuxz246@163.com
  • 基金资助:
    高原与盆地暴雨旱涝灾害四川省重点实验室科技发展基金项目(SCQXKJYJXMS202318);高原与盆地暴雨旱涝灾害四川省重点实验室科技发展基金项目(SCQXKJYJXMS202320)

Evolution characteristics of drought in the Panzhihua and Liangshan regions of Sichuan Province based on NDVI-LST model in the past 20 years

LIU Xingzhong1,2(), HU Chun1,2(), HE Chao1,2, HE Guoping3, MA Xiao4, JIANG Xubin5   

  1. 1. Sichuan Meteorological Observation and Data Centre, Chengdu 610072, China
    2. Heavy Rain and Drought-Flood Disasters in Plateau and Basin Key Laboratory of Sichuan Province chengdu 610072, China
    3. Panzhihua Meteorological Office, Panzhihua 617000, Sichuan, China
    4. Liangshan Meteorological Office, Liangshan 615000, Sichuan , China
    5. Heilongjiang Meteorological Observation and Data Centre, Harbin 150000, China
  • Received:2023-07-21 Revised:2023-11-23 Online:2024-04-30 Published:2024-05-12

摘要:

随着全球变暖不断加剧,区域性干旱事件频发,我国近些年采取了诸多措施来应对干旱事件,为分析相关措施成效,以四川攀枝花、凉山州地区(简称“攀西地区”)为例,研究该区域近20 a干旱演变特征,以服务当地生产和发展。利用中分辨率成像光谱仪(Moderate Resolution Imaging Spectroradiometer,MODIS)的归一化植被指数(Normalized Difference Vegetation Index,NDVI)和地表温度(Land Surface Temperature,LST)数据计算了2003—2022年攀西地区的温度植被干旱指数(Temperature Vegetation Dryness Index,TVDI),分析TVDI在不同时间尺度上的变化及该区域过去20 a来干旱的演变特征。研究表明:(1)攀西地区干旱多发生在春季的3—5月,10月前后TVDI值最低,也是最不易发生干旱的时段。(2)攀西地区干旱逐年缓解,由TVDI监测的无旱和重旱区域所占面积变化不大;轻旱面积有所增加,2013年后比之前平均增加5.30%;而中旱面积有所减少,2013年后比之前平均减少5.67%。(3)昭觉、布拖和越西等地干旱缓解明显,而木里、米易、会理等地区干旱有加重趋势。(4)攀西地区旱情大部分区域较稳定,其面积约占总面积的82.59%,干旱重心南北方向上变化较小,但有向西迁移的趋势。

关键词: MODIS, TVDI, 攀西地区, 干旱演化

Abstract:

With the continuous intensification of global warming and the frequent occurrence of regional drought events, many measures to cope with drought events have been taken in recent years. In order to analyze the effectiveness of relevant measures, the Panzhihua and Liangshan Prefecture (referred to as “Panxi Area”) in Sichuan Province is taken as an example to study the evolution characteristics of drought in the region in the past 20 years, so as to serve local production and development. The Normalized Difference Vegetation Index (NDVI) and Land Surface Temperature (LST) data of MODIS were used to calculate the Temperature Vegetation Drought Index (TVDI) in Panxi Area from 2003 to 2022, and the changes of TVDI on different time scales and drought evolution characteristics over the past 20 years were analyzed. The results are as follows: (1) Droughts in the Panxi area mostly occurs from March to May in spring, and the TVDI value is the lowest around October each year, which is also the period less prone to drought. (2) The drought in Panxi Area was alleviated year by year, and the areas of drought-free and drought-severe areas monitored by TVDI had little change.The area of light drought has increased, with an average increase of 5.30% after 2013. On the other hand, the area of medium drought has decreased, with an average decrease of 5.67% after 2013. (3) The drought in Zhaojue, Butuo and Yuexi has eased obviously, while the drought in Muli, Miyi and Huili has an aggravation trend. (4) The regional drought is relatively stable in most areas, accounting for 82.59% of the total area, while the drought center changes little from south to north, but it has a trend of westward migration.

Key words: MODIS, TVDI, Panzhihua and Liangshan regions, drought evolution

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