| JIANG Maofei,XU Ke,LIU Yalong,ZHAO Jin,WANG Lei. 2018. Assessment of reprocessed sea surface height measurements derived from HY-2A radar altimeter and its application to the observation of 2015-2016 El Niño. Acta Oceanologica Sinica, 37(1):115－129 |
| Assessment of reprocessed sea surface height measurements derived from HY-2A radar altimeter and its application to the observation of 2015-2016 El Niño |
| 重处理的海洋二号雷达高度计海面高度测量值评估及其在2015-2016厄尔尼诺观测中的应用 |
| Received:June 05, 2017 |
| DOI：10.1007/s13131-018-1162-z |
| Key words:HY-2A radar altimeter sea surface height El Niño |
| 中文关键词: 海洋二号 雷达高度计 海面高度 厄尔尼诺 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | JIANG Maofei | Key Laboratory of Microwave Remote Sensing, National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | XU Ke | Key Laboratory of Microwave Remote Sensing, National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China | xuke@mirslab.cn | | LIU Yalong | Yantai Marine Environmental Monitoring Center Station, State Oceanic Administration, Yantai 264000, China | | | ZHAO Jin | Key Laboratory of Microwave Remote Sensing, National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China | | | WANG Lei | Key Laboratory of Microwave Remote Sensing, National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China | |
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| Abstract: |
| Haiyang-2A (HY-2A) is China’s first ocean dynamic environment satellite and the radar altimeter is one of its main payloads. One of the main purposes of the radar altimeter is to measure the sea surface height (SSH). The SSH determined from the altimeter range measurements includes some range and geophysical corrections. These corrections largely affect the accuracy of the SSH measurements. The range and the geophysical corrections are reprocessed and the altimeter waveforms in HY-2A sensor interim geophysical data set records (S-IGDR) are retracked from June 1, 2014 to June 14, 2014, and the accuracy of the reprocessed SSH measurements is evaluated. The methods of the range and geophysical corrections used to reprocess HY-2A altimeter data are validated by using these methods to reprocess the Jason-2 range and geophysical corrections and comparing the results with the range and geophysical corrections in Jason-2 geophysical dataset records (GDR) product. A crossover analysis is used to evaluate the accuracy of the reprocessed HY-2A SSH measurements. The standard deviation (STD) of the crossover SSH differences for HY-2A is around 4.53 cm while the STD of the SSH differences between HY-2A and Jason-2 is around 5.22 cm. The performance of the reprocessed HY-2A SSH measurements is significantly improved with respect to the SSH measurements derived from HY-2A interim geophysical dataset records (IGDR) product. The 2015-2016 El Niño has been the strongest El Niño event since 1997-1998. The range and the geophysical corrections in HY-2A IGDR are reprocessed and sea level anomalies are used to monitor the 2015-2016 El Niño. The results show that the HY-2A altimeter can well observe the 2015-2016 El Niño. |
| 中文摘要: |
| 海洋二号（HY-2A）是中国第一颗海洋动力环境卫星，雷达高度计是它的主要有效载荷之一。雷达高度计的主要用途是测量海面高度，但是通过雷达高度计最终得到的海面高度包含测距和地球物理校正，这些校正会极大地影响海面高度测量值的精度。本文重新处理了2014年6月1日至2014年6月14日的HY-2A高度计传感器临时地球物理记录（S-IGDR）中的测距和地球物理校正，并且评估了重处理后海面高度测量值的精度。通过重处理Jason-2高度计的测距和地球物理校正并与Jason-2地球物理记录（GDR）中的校正项对比来验证重处理的测距和地球物理校正方法。通过交叉点分析法对重处理的海面高度测量值进行评估，HY-2A自交叉时，交叉点不符值的标准差约为4.53 cm；HY-2A和Jason-2互交叉时，交叉点不符值的标准差约为5.22 cm。重处理的海面高度明显优于HY-2A高度计临时地球物理记录（IGDR）中的海面高度。2015-2016年发生了自1997-1998年以来强度最大的厄尔尼诺事件，本文重处理了HY-2A高度计IGDR数据，并使用海面高度异常值监测2015-2016厄尔尼诺，结果显示HY-2A高度计能够很好地观测2015-2016厄尔尼诺。 |
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