激光雷达数据应用于海气界面气体传输速率的估算  

Estimation of Air-Sea Gas Transfer Velocity Using the CALIPSO Lidar Measurements

作　　者：吴东[1] 王建华[1] 阎逢旗[1] 

机构地区：[1]中国海洋大学信息科学与工程学院,山东青岛266100

出　　处：《光学学报》2012年第9期271-279,共9页Acta Optica Sinica

基　　金：国家自然科学基金(41076116;40876017)资助课题

摘　　要：选取2007年1、4、7、10月4个月夜间无云的云-气溶胶激光雷达和红外探测者观测卫星(CALIPSO)星载激光雷达Version 3.01数据,提取532nm激光海面后向散射系数并计算海面波浪均方斜率。同时选用准同步AMSR-E海面风速数据,利用Wanninkhof等于2009年提出的包含线性、平方、立方项的海面风速与气体传输速率混合关系模型计算海水施密特数为660时的海气界面气体传输速率k660。通过回归分析,得到由星载激光雷达数据反演k660的关系模型。将激光雷达数据反演结果与采用4种典型海面风速关系模型的计算结果进行比较,给出由星载激光雷达数据反演的4个月平均的海气界面气体传输速率全球分布图和纬度分布图。研究表明,CALIPSO星载激光雷达532nm单脉冲测量数据可用于反演海气界面气体传输速率。Four months （January, April, July and October, 2007） of the cloud-aerosol lidar and infrared path finder statellite observations （CALIPSO） lidar 532 nm cloud-free nighttime L1 data （Version 3.01） are used to derive sea surface backscattering coefficient and calculate sea surface mean square wave slope. The collocated AMSR-E sea surface wind speed data are used to calculate air-sea gas transfer velocity at a Schmidt number of 660 using a hybrid model, containing mixed relation between sea surface wind speed with linear, quadratic and cubic terms and gas transfer relocity, proposed by Wanninkhof et al. in 2009. Based on regression analysis, an improved expression for estimating the air-sea gas transfer velocity using satellite lidar measurements is derived and presented. Air-sea gas transfer velocities derived from the CALIPSO lidar data are then compared with that computed from four typical wind speed-transfer velocity relations using the collocated AMSR-E sea surface wind speed data. Global and latitudinal distributions of air-sea gas transfer velocity derived from the four months of CALIPSO lidar data are presented. The results show that the CALIPSO lidar 532 nm single shot data can be used to estimate air-sea gas transfer velocity.

关 键 词：遥感 星载激光雷达 海面后向散射 海气界面气体传输速率 海面波浪均方斜率 

分 类 号：P733.3[天文地球—物理海洋学]