利用南极走航观测评估卫星遥感海表面温度

李明; 张占海; 刘骥平; 孙波; 吴辉碇; 李娜

利用南极走航观测评估卫星遥感海表面温度

1.
国家海洋局第二海洋研究所, 浙江杭州 310012;中国极地研究中心, 上海 200136
2.
中国极地研究中心, 上海 200136
3.
中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室, 北京 100029

基金项目: 国家科技支撑计划项目(2006BAB18B03);中国科学院"百人计划";国家重点基础研究发展计划项目(2006CB403605);国家自然科学基金面上项目(40676003);公益性行业科研专项(2008416022)

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出版历程
- 收稿日期: 2007-12-15
- 修回日期: 2008-04-12

Evaluation of satellite-based sea surface temperature using in situ measurements from Chinese Antarctic Expeditions

1.
Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Polar Research Institute of China, Shanghai 200136, China
2.
Polar Research Institute of China, Shanghai 200136, China
3.
State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China

摘要

摘要: 利用1989-2005年间南极走航观测的海表面温度,对目前3个主要的卫星反演的SST产品AVHRR(Advanced Very High Resolution Radiometer),TMI(TRMM Microwave Imager)和AMSR-E(Advanced Microwave Scanning Radiometer for the Earth Observing System)进行了较为系统的评估,并着重检验了它们在南大洋的准确性.结果表明,AVHRR SST比观测数据偏冷,白天的偏差为-0.12℃,夜晚的偏差为-0.04℃,而且南大洋的冷偏差更为显著.TMI SST比观测数据明显偏暖,白天的偏差为0.48℃,夜晚的偏差为0.57℃,其温差ΔT受37GHz风速影响,在强风速(>6m/s)下这种影响仍然存在.AMSR-ESST比观测数据偏暖,白天的偏差为0.34℃,夜晚的偏差为0.27℃,而且南大洋的暖偏差相对较大.AMSR-E SST温差受水汽影响,并在南大洋随着水汽的增加而增加.通过进一步比较微波(AMSR-E和TMI)和红外(AVHRR)遥感的SST在2004年北半球冬季(即南半球夏季)的差别,发现微波遥感在热带(15°S-15°N)和南大洋区域(45°S以南)比红外遥感偏暖,而且在南大洋区域的偏差相对较大,相反在北半球中纬度区域(15°~40°N)偏冷.AMSR-E与AVHRR SST的温差,从白天到夜晚有减小的趋势,而TMI与AVHRR SST的温差无明显的变化.
- 海表面温度 /
- 卫星遥感 /
- 南极走航观测 /
- 南大洋
Abstract: In this study,we evaluated three satellite remote sensing SST from AVHRR(Advanced Very High Resolution Radiometer),TMI(TRMM Microwave Imager) and AMSR-E(Advanced Microwave Scanning Radiometer for the Earth Observing System) using the in situ measurements obtained from the Chinese Antarctic Expeditions for the period 1989-2005,withem phasis on the Southern Ocean.Compared to the ship observations,AVHRR SST has a mean bias of -0.12℃ for day time and -0.04℃ for nighttime,and the cold bias is more pronounced in the Southern Ocean.TMI SST shows large warm biases relative to the observations(0.48℃ for day time and 0.57℃ for nighttime).The biases of TMI SST (△T) are influenced by 37 GHz wind speed,and the influence still exists even as the wind speed is higher than 6 m/s.AM SR-E SST also shows warm biases(0.34℃ for day time and 0.27℃ for night time),which are larger in the Southern Ocean as compared to other regions.The biases of AMSR-E SST are influenced by water vapor,particularly increasing with the increasing water vapor in the Southern Ocean.The comparison between the microwave(AM SR-E/TMI) and near infrared(AVH RR) SST suggests that the microwave SST is warmer in the tropical and Southern Ocean,but colder in the mid-latitude.In addition,for AMSR-E,the magnitude of the SST difference has a decreasing tendency from daytime to nighttime,whereas for TMI,there is not obvious change in the magnitude of the SST difference.
- sea surface temperature /
- satellite remote sensing /
- in situ measurements /
- Southern Ocean

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