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遥感技术与应用  2012, Vol. 27 Issue (5): 754-762    DOI: 10.11873/j.issn.1004-0323.2012.5.754
遥感应用     
基于AVHRR和MODIS数据的全球植被物候比较分析
刘玲玲,刘良云,胡 勇
(中国科学院对地观测与数字地球科学中心,北京 100094)
Comparative Analysis of Global Vegetation Phenology based on AVHRR and MODIS
Liu Lingling,Liu Liangyun,Hu Yong
(Center for Earth Observation and Digital Earth,Chinese Academy of Sciences,Beijing 100094,China)
 全文: PDF(4555 KB)  
摘要:

AVHRR和MODIS卫星数据在全球和区域尺度植物物候对气候变化响应研究中起着重要的作用,然而两种传感器在全球尺度物候监测的一致性有待验证。首先利用时间序列谐波分析法(HANTS)对2005年全球GIMMS AVHRR NDVI和MODIS 13A2 数据进行滤波处理;然后基于改进的动态阈值方法,提取全球植被的返青期(SOS)、枯黄期(EOS)和生长季长度(DOS);最后分区域比较和评估两种传感器提取物候参数的潜力。研究结果表明:2005年全球大部分地区植被在第100~140 d开始生长,到第260~300 d逐渐停止生长,生长季长度集中在130~180 d,并且和区域研究结果具有一致性;两种传感器提取的植被关键物候期的空间变化趋势是一致的,随着纬度升高,返青期呈现推迟趋势,枯黄期呈现提早趋势,生长季长度呈现缩短趋势;AVHRR和MODIS提取落叶林和草地的SOS、EOS和DOS在欧亚大陆和北美洲区域的相关系数大部分达到0.9以上。

关键词: 全球变化AVHRRMODIS返青期枯黄期生长季长度    
Abstract:

The AVHRR and MODIS satellites have played a vital role in monitoring vegetation phenology responses to climate change at a global scale.It is important to examine whether the derived phenological parameters from AVHRR are consistent with from MODIS.In this paper,a dynamic threshold method was applied to extract the phenological metrics based on GIMMS AVHRR NDVI and MODIS 13A2 NDVI dataset smoothed with HANTS in 2005,such as Start of Season (SOS),End of Season (EOS),and Duration of Season (DOS).Then,the comparative analysis was performed on the phenological metrics between AVHRR and MODIS.The results showed the SOS appeared between 100th and 140th days,the EOS occurred between 260th and 300th days,the DOS mainly existed from 130th to 180th days in most regions.The phenological variation along latitude based on AVHRR was consistent with based on MODIS,a trend of later SOS,an earlier EOS and a shorter DOS with increase of latitude were observed.The SOS,EOS and DOS from AVHRR and MODIS data were quite consistent with a correlation coefficient larger than 0.9 for the deciduous forests and grasslands in Eurasia and North America.

Key words: Global change    AVHRR    MODIS    SOS    EOS    DOS
收稿日期: 2011-12-01 出版日期: 2012-10-17
:  TP 79  
基金资助:

国家973计划项目(2009CB723902),国家自然科学基金项目(40971197)。

作者简介: 刘玲玲(1987-),女,河南周口人,博士研究生,主要从事全球变化与植物物候研究。Email:liulingling1002@126.com。
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引用本文:

刘玲玲,刘良云,胡 勇. 基于AVHRR和MODIS数据的全球植被物候比较分析[J]. 遥感技术与应用, 2012, 27(5): 754-762.

Liu Lingling,Liu Liangyun,Hu Yong . Comparative Analysis of Global Vegetation Phenology based on AVHRR and MODIS. Remote Sensing Technology and Application, 2012, 27(5): 754-762.

链接本文:

http://www.rsta.ac.cn/CN/10.11873/j.issn.1004-0323.2012.5.754        http://www.rsta.ac.cn/CN/Y2012/V27/I5/754

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