基于双温度差分双源模型的遥感方法反演四川汶川地区的潜热通量
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摘要
研究表明,在很多地震前都出现了潜热通量异常。文中基于Modis遥感数据,结合研究区(四川省汶川地区)的高光谱数据及地面观测的气象数据,利用一种简化的双层模型(双温度差分双源模型)反演显热通量,并通过地表能量平衡方程计算研究区的潜热通量。还探讨了该模型的特点,并对龙门山断裂带通过地区进行了潜热通量的遥感反演,发现在2008年5月12日汶川MS8.0地震前48h内,研究区内的震中地区、龙门山断裂周边地区潜热通量值出现了明显的高值,5月12日中午12时7分沿龙门山断裂带潜热通量值达到300～400W/m2,可能是汶川8.0级地震前的异常反应。
Research shows that anomalous increase of latent heat flux was discovered before several earthquakes.Basing on the Modis data,high-spectral data and ground meteorological data of the working area,we retrieved the sensible heat flux and calculated the latent heat flux from surface energy balance equation using a simplified two-layer model(dualtemperature-difference method).In this paper,we also discussed the characteristics of this model,and retrieved the latent heat flux of the area where the Longmenshan Fault goes through.Finally,we found that there were significantly high values of latent heat flux in the epicenter area of the MS8.0 Wenchuan earthquake and the surrounding area of Longmenshan Fault 48 hours before the earthquake,the latent heat flux on May 12 reached the maximum of 300～400W/m2,which might be the anomalous increase of latent heat flux before the MS8.0 Wenchuan earthquake.
Research shows that anomalous increase of latent heat flux was discovered before several earthquakes.Basing on the Modis data,high-spectral data and ground meteorological data of the working area,we retrieved the sensible heat flux and calculated the latent heat flux from surface energy balance equation using a simplified two-layer model(dualtemperature-difference method).In this paper,we also discussed the characteristics of this model,and retrieved the latent heat flux of the area where the Longmenshan Fault goes through.Finally,we found that there were significantly high values of latent heat flux in the epicenter area of the MS8.0 Wenchuan earthquake and the surrounding area of Longmenshan Fault 48 hours before the earthquake,the latent heat flux on May 12 reached the maximum of 300～400W/m2,which might be the anomalous increase of latent heat flux before the MS8.0 Wenchuan earthquake.
引文
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吕光辉,贡璐.2007.MODIS热红外数据在乌鲁木齐市热岛研究中的应用[J].干旱区研究,24(5):698—703.L Guang-hui,GONG Lu.2007.Application of MODIS thermal infrared data to the research of urban heat island inUrumqi[J].Arid Zone Research,24(5):698—703(in Chinese).
刘雅妮,武建军,夏虹,等.2005.地表蒸散遥感反演双层模型的研究方法综述[J].干旱区地理,28(1):65—71.LIU Ya-ni,WU Jian-jun,XIA Hong,et al.2005.Summary of two-layer models on estimating evapotranspiration usingquantitative parameters derived from remote sensing[J].Arid Land Geography,28(1):65—71(in Chinese).
毛克彪,覃志豪,施建成,等.2005.针对MODIS影像的劈窗算法研究[J].武汉大学学报(信息科学版),30(8):703—707.MAO Ke-biao,TAN Zhi-hao,SHI Jian-cheng,et al.2005.The research of split-window algorithm on the MODIS[J].Geomatics and Information Science of Wuhan University,30(8):703—707(in Chinese).
王开存,周秀骥,李维亮,等.2005.利用卫星遥感资料反演感热和潜热通量的研究综述[J].地球科学进展,20(1):42—48.WANG Kai-cun,ZHOU Xiu-ji,LI Wei-liang,et al.2005.Using satellite remotely sensed data to retrieve sensible andlatent heat fluxes:A review[J].Advances in Earth Science,20(1):42—48(in Chinese).
周榕,徐涵秋,林云杉.2006.城市建成区地表热通量的遥感研究:以泉州市区为例[J].遥感信息,6:50—54.ZHOU Rong,XU Han-qiu,LIN Yun-shan.2006.Remote sensing study on the surface heat flux and its relationshipwith the urban heat island:Taking Quanzhou city,SE China as example[J].Remote Sensing Information,6:50—54(in Chinese).
赵英时.2005.遥感应用分析原理与方法[M].北京:科学出版社.ZHAO Ying-shi.2005.Principle and Method of the Application and Analysis of Remote Sensing[M].Science Press,Beijing(in Chinese).
周云轩,王黎明,陈圣波,等.2005.吉林西部陆面遥感蒸散模型研究[J].吉林大学学报(地球科学版),35(6):812—817.ZHOUYun-xuan,WANG Li-ming,CHEN Sheng-bo,et al.2005.A remote sensing based land surface evapotranspira-tion model for the west of Jilin Province[J].Journal of Jilin University(Earth Science Edition),35(6):812—817(in Chinese).
严研,邓志辉,陈梅花.2008.武汉东湖地区几种特征植物叶绿素与光谱特征关系的研究[J].林业科技开发,5(22):35—39.YAN Yan,DENG Zhi-hui,CHEN Mei-hua.2008.Research on the relation between chlorophyll content and the spec-tral characteristics of some representative plants in East Lake area in Wuhan[J].China Forestry Science andTechnology,5(22):35—39(in Chinese).
Anderson M C,Norman J M,Diak G R,et al.1997.A two-source time-integrated model for estimating surface fluxesfrom thermal infrared satellite observations[J].Remote Sens Environ,(60):195—216.
Bastiaanssen W G M.2000.SEBAL-based sensible and latent heat fluxes in the irrigated Gediz Basin[J].TurkeyJournal of Hydrology,(229):87—100.
Dey S,Singh R P.2003.Surface latent heat flux as an earthquake precursor[J].Natural Hazards and Earth System Sci-ences,3:749—755.
Norman J M,Kustas W P,Prueger J H,et al.2000.Surface flux estimation using radiometric temperature:A dualtem-perature-difference method to minimize measurement errors[J].Water Resources Research,36(8):2263—2274.
Shuttleworth W J,Gurney R J.1990.The theoretical relationship between foliage temperature and canopy resistance insparse crops[J].Quarterly Journal of the Royal Meteorological Society,116:498—519.
Shuttleworth W J,Wallace J S.1985.Evaporation from sparse crops-an energy combination theory[J].Quart J R MetSoc,(111):839—855.
Kaufman Y J,Gao B C.1992.Remote sensing of water vapor in the near IR from EOS/MODIS[J].Transactions onGeoscience and Remote Sensing,30(5):871—884.
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