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

  • Zenghong Liu (刘增宏)
  • Xingrong Chen (陈幸荣)
  • Chaohui Sun (孙朝辉)
  • Xiaofen Wu (吴晓芬)
  • Shaolei Lu (卢少磊)
Physics

Abstract

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.

Keywords

Argo near-surface temperature (NST) Advanced Microwave Scanning Radiometer for the Earth Observing System (AMSR-E) sea surface temperature (SST) 

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Copyright information

© Chinese Society for Oceanology and Limnology, Science Press and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Zenghong Liu (刘增宏)
    • 1
    • 2
  • Xingrong Chen (陈幸荣)
    • 3
  • Chaohui Sun (孙朝辉)
    • 2
  • Xiaofen Wu (吴晓芬)
    • 2
  • Shaolei Lu (卢少磊)
    • 2
  1. 1.State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of OceanographyState Oceanic AdministrationHangzhouChina
  2. 2.Second Institute of OceanographyState Oceanic AdministrationHangzhouChina
  3. 3.National Marine Environmental Forecasting CenterBeijingChina

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