| XIA Shenzhen,KE Changqing,ZHOU Xiaobing,ZHANG Jie. 2016. 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 Oceanologica Sinica, 35(3):54－62 |
| Assessment and adjustment of sea surface salinity products from Aquarius in the southeast Indian Ocean based on in situ measurement and MyOcean modeled data |
| 基于现场观测与MyOcean模式数据的印度洋东南部Aquarius反演海表盐度的评价与纠正 |
| Received:January 24, 2015 Revised:May 05, 2015 |
| DOI：10.1007/s13131-016-0818-9 |
| Key words:Aquarius sea surface salinity (SSS) in situ SSS MyOcean comparison analysis southeast Indian Ocean |
| 中文关键词: 宝瓶座 海表盐度 现场观测数据 比较分析 印度洋东南部西风 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | XIA Shenzhen | Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, Nanjing University, Nanjing 210023, China
Collaborative Innovation Center of South China Sea Studies, Nanjing 210023, China
Collaborative Innovation Center of Novel Software Technology and Industrialization, Nanjing 210023, China | | | KE Changqing | Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, Nanjing University, Nanjing 210023, China
Collaborative Innovation Center of South China Sea Studies, Nanjing 210023, China
Collaborative Innovation Center of Novel Software Technology and Industrialization, Nanjing 210023, China | kecq@nju.edu.cn | | ZHOU Xiaobing | Department of Geophysical Engineering, Montana Tech of the University of Montana, Butte, MT 59701, USA | | | ZHANG Jie | The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | |
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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. |
| 中文摘要: |
| 本文分析了印度洋东南部西风带(30°-60°S,80°E-120°E)海区科学考察的实测盐度数据,并用来评价和比较与Aquarius反演海表盐度的差异。在印度洋中低纬海区,基于被动微波遥感的海表反演盐度受风速和海表温度的影响。将实测与Aquarius反演海表盐度之间的关系,以及风速和温度的修正用来校正Aquarius反演海表盐度,并用MyOcean模式数据来评价Aquarius反演海表盐度的校正效果。结果表明,与MyOcean模式海表盐度数据相比,校正前多数海区的Aquarius反演海表盐度相对偏高,但是55?S以南和98?E以西的低温区偏低。在印度洋东南部Aquarius反演海表盐度平均偏高0.42。校正大大消弱了高风速的影响,明显提高了Aquarius反演海表盐度的总体精度,与MyOcean模式海表盐度数据相比,平均误差为-0.05,平均绝对误差降低了0.06。42°S附近,校正的Aquarius反演海表盐度与MyOcean模式数据高度一致,二者差异大约只有0.004。 |
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