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Assessment and adjustment of sea surface salinity products from Aquarius in the southeast Indian Ocean based on in situ measurement and MyOcean modeled data

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Abstract

The in situ sea surface salinity (SSS) measurements from a scientific cruise to the western zone of the southeast Indian Ocean covering 30°–60°S, 80°–120°E are used to assess the SSS retrieved from Aquarius (Aquarius SSS). Wind speed and sea surface temperature (SST) affect the SSS estimates based on passive microwave radiation within the mid- to low-latitude southeast Indian Ocean. The relationships among the in situ, Aquarius SSS and wind-SST corrections are used to adjust the Aquarius SSS. The adjusted Aquarius SSS are compared with the SSS data from MyOcean model. Results show that: (1) Before adjustment: compared with MyOcean SSS, the Aquarius SSS in most of the sea areas is higher; but lower in the low-temperature sea areas located at the south of 55°S and west of 98°E. The Aquarius SSS is generally higher by 0.42 on average for the southeast Indian Ocean. (2) After adjustment: the adjustment greatly counteracts the impact of high wind speeds and improves the overall accuracy of the retrieved salinity (the mean absolute error of the Zonal mean is improved by 0.06, and the mean error is - 0.05 compared with MyOcean SSS). Near the latitude 42°S, the adjusted SSS is well consistent with the MyOcean and the difference is approximately 0.004.

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Authors and Affiliations

  1. Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, Nanjing University, Nanjing, 210023, China

    Shenzhen Xia & Changqing Ke

  2. Collaborative Innovation Center of South China Sea Studies, Nanjing, 210023, China

    Shenzhen Xia & Changqing Ke

  3. Collaborative Innovation Center of Novel Software Technology and Industrialization, Nanjing, 210023, China

    Shenzhen Xia & Changqing Ke

  4. Department of Geophysical Engineering, Montana Tech of the University of Montana, Butte, MT, 59701, USA

    Xiaobing Zhou

  5. The First Institute of Oceanography, State Oceanic Administration, Qingdao, 266061, China

    Jie Zhang

Authors
  1. Shenzhen Xia
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  2. Changqing Ke
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  3. Xiaobing Zhou
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  4. Jie Zhang
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Corresponding author

Correspondence to Changqing Ke.

Additional information

Foundation item: The National Natural Science Foundation of China under contract No. 41371391; the Innovative Youth Foundation of Ocean Telemetry Engineering and Technology Centre of State Oceanic Administration under contract No. 201302; the Program for the Specialized Research Fund for the Doctoral Program of Higher Education of China under contract No. 20120091110017.

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Xia, S., Ke, C., Zhou, X. et al. Assessment and adjustment of sea surface salinity products from Aquarius in the southeast Indian Ocean based on in situ measurement and MyOcean modeled data. Acta Oceanol. Sin. 35, 54–62 (2016). https://doi.org/10.1007/s13131-016-0818-9

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  • DOI: https://doi.org/10.1007/s13131-016-0818-9

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