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Chinese Science Bulletin, Volume 65 , Issue 18 : 1888-1897(2020) https://doi.org/10.1360/TB-2020-0197

Development and evaluation of a new merged sea surface height product from multi-satellite altimeters

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  • ReceivedJan 29, 2020
  • AcceptedApr 1, 2020
  • PublishedApr 2, 2020

Abstract


Funded by

国家自然科学基金(4177050135,41705042)


Acknowledgment

感谢国防科技大学气象海洋学院王辉赞副研究员对本研究提出的修改建议.


Supplement

补充材料

图S1 2018年3月8日沿J3轨道和S3A轨道的ADT对比

本文以上补充材料见网络版csb.scichina.com. 补充材料为作者提供的原始数据, 作者对其学术质量和内容负责.


References

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  • Figure 1

    Coverage of multi-satellite orbits for 23 d and background error correlation coefficients. (a) Distribution of absolute dynamic topography (ADT, unit in m) along the tracks acquired by altimeter satellites 11 d before and after February 17th, 2018; (b) maximum data gap uncovered by satellite orbits (unit in km); (c) background error correlation coefficients, calculated with the differences between mapped data and along-track observation filtered data. Red solid line denotes the distribution of background error correlation coefficient of 2DVAR. Red dashed line denotes the Gaussian distribution by fitting 2DVAR with its correlation coefficient scale of 50 km. Blue solid line denotes the distribution of background error correlation coefficient of AVISO calculated from 25 years mean background

  • Figure 2

    Average energy spectral density of AVISO (blue), 2DVAR (red) and along-track observation filtered data on J3 (a) and S3A (b) satellite tracks. The ratio of average energy spectral density of AVISO and 2DVAR to J3 (c) satellites along-track observation filtered data and S3A (d) satellites along-track observation filtered data respectively. The scales shorter than 65 km are not listed for the filtering

  • Figure 3

    Scatter distributions of ADT (units in m) of AVISO (a) and 2DVAR (b) compared with J3 satellite along-track observation filtered data respectively. Scatter distributions of ADT of AVISO (c) and 2DVAR (d) compared with S3A satellite along-track observation filtered data respectively. The red solid line is the scatter fitting line. R is the similarity, and RMSD is the root mean square error (units in cm)

  • Figure 4

    Root mean square error of ADT (units in cm) between AVISO (a), 2DVAR (b) and J3 satellite along-track observation filtered data. (c) Error relation index of merged product along J3 satellite track. (d), (e) and (f) correspond to (a), (b) and (c) respectively but S3A satellite along-track observation filtered data instead

  • Figure 5

    Distribution of sea surface geostrophic current (vector arrow) from the ADT of AVISO (a) and 2DVAR (b) on February 19th, 2018. Sea surface temperatures (SSTs, shaded) are from AMSR2 satellite

  • Figure 6

    Comparisons with drifter data. (a) Drifter tracks in South China Sea during January 1 to June 10, 2018. Scatter distribution of the geostrophic current speed of AVISO (b) and 2DVAR (c) corresponding to drifter data and the scatter fitting line (red) and the root mean square error (RMSE). Distribution of ADT of AVISO (d) and 2DVAR (e) with the track of drifter ID-63250950. Blue is the current day and the red is one day before and after. Vector is the direction of movement of drifter

  • Table 1   Information about altimeter satellites over South China Sea

    卫星高度计

    周期(d)

    纬度范围(°)

    周期轨道数

    赤道上轨道间距离(km)

    测量误差(cm)

    是否太阳同步卫星

    双频高度计

    资料起始日期

    J3

    10

    ±66

    254

    ~315

    2.9

    2016.02.17

    C2

    29

    ±88

    840

    ~98

    2.5

    2011.01.28

    SA

    35

    ±81.5

    1002

    ~80

    2.1

    2016.07.04

    HY-2A

    14

    ±81

    386

    ~210

    3.1

    2016.03.15

    S3A

    27

    ±81.5

    770

    ~100

    2.4

    2016.06.15

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