A comparison of Argo nominal surface and near-surface temperature for validation ofAMSR-E SST  

作　　者：刘增宏 陈幸荣 孙朝辉 吴晓芬 卢少磊 

机构地区：[1]State Key Laboratory of Satellite Ocean Environment Dynamics,Second lnstitute of Oceanography,State Oceanic Administration,Hangzhou 310012,China [2]Second Institute of Oceanography,State Oceanic Administration,Hangzhou 310012,China [3]National Marine Environmental Forecasting Center,Beijing 100081,China

出　　处：《Chinese Journal of Oceanology and Limnology》2017年第3期712-721,共10页中国海洋湖沼学报（英文版）

基　　金：Supported by the National Basic Research Program of China(973 Program)(No.2013CB430301);the National Natural Science Foundation of China(Nos.41321004,41206022,41406022);the National Special Research Fund for Non-Profit Marine Sector(No.201305032)

摘　　要：Satellite SST(sea surface temperature) from the Advanced Microwave Scanning Radiometer for the Earth Observing System(AMSR-E) is compared with in situ temperature observations from Argo profiling floats over the global oceans to evaluate the advantages of Argo NST(near-surface temperature: water temperature less than 1 m from the surface). By comparing Argo nominal surface temperature(~5 m) with its NST, a diurnal cycle caused by daytime warming and nighttime cooling was found, along with a maximum warming of 0.08±0.36°C during 14:00–15:00 local time. Further comparisons between Argo 5-m temperature/Argo NST and AMSR-E SST retrievals related to wind speed, columnar water vapor, and columnar cloud water indicate warming biases at low wind speed(<5 m/s) and columnar water vapor >28 mm during daytime. The warming tendency is more remarkable for AMSR-E SST/Argo 5-m temperature compared with AMSR-E SST/Argo NST, owing to the effect of diurnal warming. This effect of diurnal warming events should be excluded before validation for microwave SST retrievals. Both AMSR-E nighttime SST/Argo 5-m temperature and nighttime SST/Argo NST show generally good agreement, independent of wind speed and columnar water vapor. From our analysis, Argo NST data demonstrated their advantages for validation of satellite-retrieved SST.Satellite SST （sea surface temperature） from the Advanced Microwave Scanning Radiometer for the Earth Observing System （AMSR-E） is compared with in situ temperature observations from Argo profiling floats over the global oceans to evaluate the advantages of Argo NST （near-surface temperature： water temperature less than 1 m from the surface）. By comparing Argo nominal surface temperature （-5 m） with its NST, a diurnal cycle caused by daytime warming and nighttime cooling was found, along with a maximum warming of 0.08＋0.36~C during 14：00-15：00 local time. Further comparisons between Argo 5-m temperature/Argo NST and AMSR-E SST retrievals related to wind speed, columnar water vapor, and columnar cloud water indicate warming biases at low wind speed （〈5 m/s） and columnar water vapor 〉28 mm during daytime. The warming tendency is more remarkable for AMSR-E SST/Argo 5-m temperature compared with AMSR-E SST/Argo NST, owing to the effect of diurnal warming. This effect of diurnal warming events should be excluded before validation for microwave SST retrievals. Both AMSR-E nighttime SST/Argo 5-m temperature and nighttime SST/Argo NST show generally good agreement, independent of wind speed and columnar water vapor. From our analysis, Argo NST data demonstrated their advantages for validation of satellite-retrieved SST.

关 键 词：ARGO near-surface temperature （NST） Advanced Microwave Scanning Radiometer for the Earth Observing System （AMSR-E） sea surface temperature （SST） 

分 类 号：P715.7[天文地球—海洋科学]