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Review on the research and development of merged satellite altimeter products

  • role： First author第一作者
  • Affiliation：

    College of Meteorology and Oceanography, National University of Defense Technology, Changsha 410073, China

    Joint Institute for Regional Earth System Science and Engineering, University of California, Los Angeles, CA 90095-7228, USA

    Department of Atmosphere and Ocean Sciences &Institute of Atmospheric Sciences, Fudan University, Shanghai 200438, China

  • Email：liu541226@126.com
  • Introduction：刘磊，研究方向为中尺度海洋资料研发及海气相互作用。E-mail：liu541226@126.com
LIU Lei123,  
  • Affiliation：

    Joint Institute for Regional Earth System Science and Engineering, University of California, Los Angeles, CA 90095-7228, USA

    Nanjing University of Information Science & Technology, Nanjing 210044, China

JIANG Xingliang24,  
  • Affiliation：

    Joint Institute for Regional Earth System Science and Engineering, University of California, Los Angeles, CA 90095-7228, USA

LI Zhijin2,  
  • role： Corresponding author通信作者
  • Affiliation：

    College of Meteorology and Oceanography, National University of Defense Technology, Changsha 410073, China

  • Email：feijf@sina.com
  • Introduction：费建芳，研究方向为灾害性天气及海气相互作用。E-mail： feijf@sina.com
FEI Jianfang1*,  
  • Affiliation：

    Key Laboratory of Ministry of Natural Resources for Marine Environmental Information Technology, Tianjin 300171, China

WU Xinrong5,  
  • Affiliation：

    College of Meteorology and Oceanography, National University of Defense Technology, Changsha 410073, China

WANG Huizan1,  
  • Affiliation：

    College of Meteorology and Oceanography, National University of Defense Technology, Changsha 410073, China

YE Fang1,  
  • Affiliation：

    Nanjing University of Information Science & Technology, Nanjing 210044, China

ZHANG Fuying4,  
  • Affiliation：

    Army Academy of Artillery and Air Defense, Nanjing 210000, China

SHI Wenli6

resumen

Merged satellite altimeter products have high scientific and social values and are widely used in many ocean related fields, such as marine environmental monitoring, ocean meso-scale structure research, and ocean numerical forecast. At present, 5—6 altimeter satellites are in orbit and simultaneously publishing along-track data. We focused on the main question of extracting effective information as much as possible from the existing satellite altimeters of constant number and improving the effective resolution and product quality. The development status of the existing merged satellite altimeter products were introduced in detail.We introduced DT series merged products made by DUACS in detail based on the widely used AVISO products. Moreover, we analyzed the influence of different merged methods on the product quality starting from the merged method and expounded the decisive role of the selection of background field in the merged method on the effective resolution of the merged product. When combined with sentinel-3a (S3a) and J3 satellites that have recently released data and CryoSat, Saral/Altika, and HY-2a satellites, the observation density of satellite altimeters along the orbit is significantly improved. Meanwhile, the effective resolution of DT2018 produced by DUACS is not significantly improved compared with DT2014 and DT2010. The main reason is that the 7, 20, and 25 year average MSS statistical fields were selected for the background field, which includes more large-scale signals in the background error, resulting in the background error. The scale of error covariance correlation coefficient is longer. The filtering effect of the observation data is more significant, and the effective resolution cannot be effectively improved. HY-2B and HY-2C satellites were successfully launched in October 2018 and September 2020, respectively, with sentinel-3b (S3b) already in operation. The accuracy and density of satellite altimeter observation data will reach a new stage together with the SWOT altimeter satellite, which will be launched in 2021. How to consider the correlation of the same orbit observation error, accurately estimate the background error, establish a more reasonable expression function of the correlation coefficient of the background error, and provide an effective method for further improving the merged product quality and effective resolution are the directions that scientists continue to explore.Previous studies showed that the quality of merged satellite altimeter products is mainly affected by three aspects(1) Type of satellite selected for the production of products: the space-time accuracy of sea surface height also varies due to the difference of orbit height and period of different types of satellites; (2) Selection of altimeter standards: instrument parameters, geophysical parameters, environmental correction, construction of mean sea level, etc.; (3) Data merged methods: selection of different merged methods in the background field, difference of background error correlation coefficient scale, and processing of observation error.

palabra clave

satellite altimeter;merged data product;effective resolution;variational method;optimal estimation

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