基于FY-3A/VIRR数据的藏北地区夏旱动态遥感监测  

Remote Sensing Monitoring of Summer Drought Dynamics in the Northern Tibet based on FY-3A/VIRR Data

作　　者：刘一哲 扎西央宗 冯文兰 多杰桑珠 白玛央宗 LIU Yizhe;Zhaxi-Yangzong;FENG Wenlan;Duojie-Sangzhu;Baima-Yangzong(Meteorological Center,East China Air Traffic Management Bureau of Civil Aviation of China,Shanghai 200050,China;Climate Centre of Tibet Autonomous Region,Lhasa 850000,China;School of Foreign Language,Chengdu University of Information Technology,Chengdu 610225,China;Meteorology Information Network Center,Meteorological Bureau of the Tibet Autonomous Region,Lhasa 850000,China)

机构地区：[1]中国民用航空华东地区空中交通管理局气象中心,上海200050 [2]西藏自治区气候中心,西藏拉萨850000 [3]成都信息工程大学外国语学院,四川成都610225 [4]西藏自治区气象局信息网络中心,西藏拉萨850000

出　　处：《高原科学研究》2022年第2期21-32,共12页Plateau Science Research

基　　金：国家自然科学基金项目(41465006);中央引导地方科技发展资金第一批项目(XZ202102YD0012C)。

摘　　要：藏北地区自然环境恶劣,严重缺乏基础气象台站观测资料,给气象干旱监测造成很大困难。遥感监测为藏北地区进行大面积、长时间序列的干旱监测提供了有效手段。运用2011—2017年FY-3A/VIRR旬数据,利用温度植被干旱指数(TVDI)模型对藏北地区干旱时空特征进行了遥感动态监测,并采用模糊数学法建立了基于FY-3A/VIRR TVDI的干旱等级监测标准。研究结果表明:(1)基于FY-3A/VIRR旬数据的TVDI与实测20 cm土壤水分含量显著相关(P<0.05),因此可用于藏北地区旱情的遥感动态监测;(2)TVDI与6—8月降水量存在显著的负相关关系(P<0.05),说明该方法能较好地反映藏北夏季气象干旱情况;(3)依据TVDI值可将干旱等级划分为无旱、轻旱、中旱、重旱、特旱,这一干旱等级划分标准存在区域差异,在对半湿润区和半干旱区进行干旱监测时,采用不同阈值有助于提高预测精度。研究结果为FY-3A数据在藏北地区旱情监测的适用性提供了实证,也为获得藏北地区的干旱等级监测结果提供了可靠的数据和方法。The spatio-temporal characteristics of drought dynamic in the northern Tibet were monitored by the temperature-vegetation drought Index(TVDI)model based on FY-3A/VIRR data from 2011 to 2017,and the monitoring standard of drought grade based FY-3A/VIRR TVDI index was established by fuzzy mathematics method.The main results are as follows:(1)The TVDI index based FY-3A/VIRR ten-day data is significantly correlated with the measured soil moisture content in 20 cm depth(P<0.05),which can be used for remote sens⁃ing dynamic monitoring of drought conditions in the northern Tibet.(2)There was a significant negative correla⁃tion between TVDI value and precipitation from June to August(P<0.05),indicating that this method could re⁃flect the meteorological drought situation in northern Tibet in summer.(3)According to TVDI,drought grade can be categorized as no drought,light drought,moderate drought,severe drought,and special drought.There are re⁃gional differences in the classification standard of drought grade.Different thresholds should be used when con⁃ducting drought monitoring in sub-humid and semi-arid areas to improve prediction accuracy in the drought monitoring.

关 键 词：FY-3A/VIRR 温度植被干旱指数 干旱等级 藏北地区 

分 类 号：P407[天文地球—大气科学及气象学]