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干旱区地理 ›› 2012, Vol. 35 ›› Issue (5): 708-716.

• 气候与水文 • 上一篇    下一篇

MODIS干旱指数对华北干旱的敏感性分析

白力改1,3,燕琴2,张丽3,谭志祥4   

  1. 1 北华航天工业学院 建筑工程系, 河北 廊坊 065000; 2 中国测绘科学研究院对地观测技术国家测绘局重点实验室, 北京 100830; 3 中国科学院数字地球重点实验室 中国科学院对地观测与数字地球科学中心, 北京 100094; 4 中国矿业大学,江苏省资源环境信息工程重点实验室, 江苏 徐州 221116
  • 收稿日期:2011-12-24 修回日期:2012-02-21 出版日期:2012-09-25
  • 通讯作者: 张丽,副研究员,主要从事资源与环境遥感研究.Email:lizhang@ceode.ac.cn
  • 作者简介:白力改(1984-),女,河北石家庄人,硕士,主要从事遥感干旱监测与应用研究.Email: blgbb@163.com
  • 基金资助:

    中国科学院对地观测与数字地球科学中心主任创新基金(Y2ZZ19101B)

Sensitivity analysis of response of MODIS derived drought indices to drought in North China

BAI Ligai1,3,YAN Qin2,ZHANG Li3,TAN Zhixiang4   

  1. 1  Department of Construction Engineering, North China Institute of Aerospace Engineering, Langfang  065000,Hebei,China; 2  Key Laboratory of Earth Observing Technology of State Bureau of Surveying and Mapping, Chinese Academy of  Surveying and Mapping, Beijing 100830, China; 3  Key Laboratory of Digital Earth, Center for Earth Observation and Digital Earth, Chinese Academy of  Sciences, Beijing 100094, China; 4  Jiangsu Key Laboratory of Resources and Environmental Information Engineering, China University of Mining and Technology, Xuzhou 221116,Jiangsu,China
  • Received:2011-12-24 Revised:2012-02-21 Online:2012-09-25
  • Contact: ZHANG Li

摘要: 针对近年来干旱发生频繁的华北地区,通过利用2000-2009年MODIS数据和气象观测站降水资料,建立草地和农田距平植被指数(AVI)与不同时间尺度标准化降水指数(SPI)之间的相关统计模型,比较AVI和距平水分指数(AWI)对干旱响应的敏感性。结果表明:(1)植被生长季AVI与不同时间尺度SPI的相关关系不同。草地AVI与1个月尺度的SPI(即1-SPI)相关系数较低,而与3-SPI相关最显著;而农田区AVI与SPI的相关性较低,总体上农田AVI与3-SPI的相关性较高;(2) AWIAVI类似,也对SPI存在时滞响应,均与3-SPI有着极显著的相关关系,并且在干旱发生较严重的6~8月份AWI与3-SPI的相关性好于AVI与3-SPI的相关性;(3)运用AWI反演的华北地区2009年夏季干旱分布图较好地反映了旱情的时空分布,与相关气象资料结果相符合。

关键词: 华北, 干旱, 距平植被指数(AVI), 距平水分指数(AWI), 标准化降水指数(SPI)

Abstract: Drought occurred frequently in recent years in North China. In this study, MOD09A1,8day surface reflectance derived from MODIS(moderateresolution imaging spectroradiometer)images provided by NASA and monthly precipitation data from ground observations obtained by China Meteorological Data Sharing Service System, which were used to study temporal responses of MODISderived drought index to climatic factors in North China. Anomaly Vegetation Index(AVI) was computed from the time series data of NDVI (based on infrared and near infrared bands) and Anomaly Water Index(AWI) was calculated from NDWI (based on near infrared and short infrared wave bands) of MODIS. Given the consequences and pervasiveness of drought, it is important to assess the specialized indices that were used to assess drought sensitivity. The standardized precipitation index (SPI) has several characteristics that are an improvement in previous indices. In this paper, 1-SPI, 2-SPI, 3-SPI, 6-SPI and 12-SPI were calculated. The correlations and lag relationships between AVI from April to October (the growing season) during 2000 to 2009 and the multipletime scale SPI in North China grassland and cropland sites were investigated based on MODIS and climate data. Besides, the relations between AVI and AWI in different periods were also analyzed. According to the sensitivity analysis of the response of AVI and AWI to drought, summer drought from June to September in 2009 in North China were monitored and analyzed by AWI. The results show: (1) the correlations are different between AVI and SPI at different time scales during vegetation growing seasons. For the grassland, the correlations are insignificant between AVI and 1-SPI, but significant between AVI and 3-SPI. However, the correlation is lower between AVI and SPI for cropland than that for grassland. In general, the correlation is higher between AVI and 3-SPI for cropland. (2) Similarly to AVI, AWI shows lag response to SPI, and has better correlation with 3-SPI. The correlation between AWI and 3-SPI is better than that between AVI and 3-SPI during period from June to August when serious drought occurs. Therefore, AWI is more sensitive to drought than AVI in North China. (3) The timeseries drought monitoring maps in North China for 2009 derived from AWI reflects the temporal and spatial dynamics of drought, which are consistent with the relevant meteorological results.

Key words: North China, drought, anomaly vegetation index(AVI), anomaly water index(AWI), standardized precipitation index(SPI)

中图分类号: 

  • TP79