大太阳天顶角下水色卫星叶绿素遥感探测能力研究  

Research on chlorophyll detection ability under high solar zenith angle

作　　者：李豪[1] 何贤强[1] 陶邦一[1] 王迪峰[1] Li Hao;He Xianqiang;Tao Bangyi;Wang Difeng(Second Institute of Oceanography,State Oceanic Administration,Hangzhou 310012,China)

机构地区：[1]国家海洋局第二海洋研究所卫星海洋环境动力学国家重点实验室,浙江杭州310012

出　　处：《海洋学报》2018年第11期128-140,共13页

基　　金：国家重点研发计划(2018YFC1407202;2017YFA0603004);国家863计划课题(2014AA123301);国家自然科学基金项目(41676170;41676172;41476155;41621064);全球变化与海气相互作用专项项目(GASI-02-SCS-YGST2-01;GASI-02-PAC-YGST2-01;GASI-02-IND-YGST2-01)

摘　　要：本文利用考虑地球曲率的矢量辐射传输模型PCOART-SA,对大太阳天顶角下叶绿素浓度的卫星遥感探测极限能力进行了模拟研究。结果表明:太阳-传感器几何参数,尤其是太阳天顶角对叶绿素浓度变化的探测极限能力影响较大;大太阳天顶角下,卫星对叶绿素浓度变化的探测能力下降十几倍。在典型陆架水体(叶绿素浓度为1μg/L),低太阳天顶角(30°)时,叶绿素浓度变化探测极限为0.012 8μg/L(约为原浓度的1.2%),而大太阳天顶角(80°)时,探测极限为0.136μg/L(约为原浓度的13.6%)。相比于太阳天顶角,观测天顶角增大造成的叶绿素浓度探测能力衰减较小。叶绿素浓度越高,吸收作用越强,对卫星遥感器的辐射探测灵敏度、定标及大气校正精度的要求越高。The detection limit of satellite chlorophyll algorithm at large solar zenith angles(SZA)in polar regions was assessed using the vector radiative transfer model of PCOART-SA which has accounted for the spherical-shell atmosphere.It was found that the geometric parameters between sun and sensor,particularly the solar zenith angle,have significant influence in the detection limit of satellite chlorophyll algorithm.The minimum chlorophyll concentration detected by satellite is about 0.136μg/L at large SZA of 80°,while the minimum value is 0.012 8μg/L at 30°.Because of the high absorption resulted by chlorophyll,the satellite detection at large SZA is difficult,and thus requires high radiometric sensitivity sensor,more accurate calibration and atmospheric correction.

关 键 词：辐射传输模型 水色遥感 PCOART-SA 大太阳天顶角 叶绿素 

分 类 号：P714[天文地球—海洋科学] P731.14