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基于MODIS数据的渤海海冰厚度反演算法优化

朱星源 苏洁 宋梅 杨茜 梁韵

朱星源,苏洁,宋梅,等. 基于MODIS数据的渤海海冰厚度反演算法优化[J]. 海洋学报,2022,44(12):70–83 doi: 10.12284/hyxb2022141
引用本文: 朱星源,苏洁,宋梅,等. 基于MODIS数据的渤海海冰厚度反演算法优化[J]. 海洋学报,2022,44(12):70–83 doi: 10.12284/hyxb2022141
Zhu Xingyuan,Su Jie,Song Mei, et al. Optimization of the Bohai Sea ice thickness retrieval algorithm based on MODIS data[J]. Haiyang Xuebao,2022, 44(12):70–83 doi: 10.12284/hyxb2022141
Citation: Zhu Xingyuan,Su Jie,Song Mei, et al. Optimization of the Bohai Sea ice thickness retrieval algorithm based on MODIS data[J]. Haiyang Xuebao,2022, 44(12):70–83 doi: 10.12284/hyxb2022141

基于MODIS数据的渤海海冰厚度反演算法优化

doi: 10.12284/hyxb2022141
基金项目: 国家自然科学基金面上项目 (42176208)。
详细信息
    作者简介:

    朱星源(1997-),男,山东省临沂市人,主要研究方向为卫星海洋学。E-mail:xingxingzhihuo123@foxmail.com

    通讯作者:

    苏洁(1966-),女,教授, 主要从事北极海冰热力学研究。E-mail:sujie@ouc.edu.cn

  • 中图分类号: P731.15

Optimization of the Bohai Sea ice thickness retrieval algorithm based on MODIS data

  • 摘要: 海冰厚度是监测与研究渤海海冰的重要参数。为了获取更加可靠的渤海海冰厚度数据,本研究基于MODIS数据对海冰厚度反演中的冰水分离环节和冰厚计算方法都进行了改进。对于冰水分离环节,本文在Canny边缘检测算子提取海冰基础上,加入了二值化处理、阈值判别等步骤,实现了较高精度的渤海海冰范围自动化提取。通过试验确定了海冰厚度与反照率指数关系模型中的参数,包括海冰衰减系数和海水反照率参数,使其更加符合渤海海区的物理特征。将改进后算法的海冰厚度反演结果与渤海海上石油平台实测数据进行比较,并分析了误差来源。结果表明,经过对算法的改进,海冰厚度与反照率指数关系模型的反演结果与实测数据之间的平均绝对误差由7.05 cm缩小到2.74 cm,相关系数由0.434提高到0.485。
  • 图  1  获取实测数据的石油平台位置

    Fig.  1  Positions of oil platform observing the measured data

    图  2  渤海海冰厚度反演算法流程

    图中红色字部分为本文针对Canny算子提取海冰裂缝[32]新加入的步骤,蓝色字部分为针对海冰厚度指数关系模型[17]参数设置的改进

    Fig.  2  Flow chart of Bohai Sea ice thickness retrieval algorithm

    The red character part in the figure is the new step of the Canny operator to extract sea ice cracks[32], and the blue character part is the improvement of the parameter setting of the sea ice thickness exponential model[17]

    图  3  2010年1月22日渤海MODIS真彩图

    Fig.  3  MODIS true color image of the Bohai Sea on January 22, 2010

    图  4  2010年1月22日渤海冰水分离过程

    Fig.  4  Process diagram of ice-water separation of the Bohai Sea on January 22, 2010

    图  5  频数分布(a)和粗糙度分布(b)

    Fig.  5  Frequency distribution (a) and roughness index distribution (b)

    图  6  渤海海区反照率(a)和海水反照率插值(b)

    Fig.  6  The albedo of Bohai Sea (a) and the albedo of sea water interpolation (b)

    图  7  训练数据集实测冰厚与衰减系数散点图

    绿色虚线为帮助描述收敛过程的辅助线

    Fig.  7  Scatter plot between attenuation coefficient and measured sea ice thickness of training data sets

    The green dotted line is the auxiliary line to help describe the convergence process

    图  8  模型中各参数对反演结果的影响

    Fig.  8  The influence of each parameter in the model on the retrieval result

    图  9  渤海海冰厚度反演结果对比

    Fig.  9  Comparison of retrieval results of Bohai Sea sea ice thickness

    图  10  2020–2021年冬季反演结果与实测数据的时间序列比较(JZ20-2平台和JZ9-3平台)

    日期后用*标注的来自测试数据集,其他为训练数据

    Fig.  10  Time series comparison between measured data and retrieval results in 2020–2021 winter (JZ9-3 and JZ20-2)

    The date with * means the data come from the test dataset, the others come from the trainning dataset

    图  11  2021年1月5日(a, e)、7日(b, f)、8日(c, g)、13日(d, h)辽东湾MODIS真彩图及海冰厚度反演结果

    Fig.  11  MODIS true color image and sea ice thickness retrieval results of Liaodong Bay on January 5 (a, e), 7 (b, f), 8 (c, g), 13 (d, h), 2021

    表  1  MODIS部分波段光谱范围

    Tab.  1  Spectral range of MODIS partial bands

    波段光谱范围/nm分辨率/m
    1620~670250(重采样为1 000)
    2841~876250(重采样为1 000)
    3459~479500(重采样为1 000)
    4545~565500(重采样为1 000)
    51 230~1 250500(重采样为1 000)
    61 628~1 652500(重采样为1 000)
    72 105~2 135500(重采样为1 000)
    3111.770~12.2701 000
    3213.185~13.4851 000
    下载: 导出CSV

    表  2  海冰厚度测试数据集实测数据与反演结果

    Tab.  2  Measured data of test data sets and retrieval results of Bohai Sea sea ice thickness

    日期站位最大实测
    厚度/cm
    平均实测
    厚度/cm
    改进前算法厚
    度(T0)/cm
    改进后算法厚
    度(T1)/cm
    仅改变海水反照
    率厚度(T2)/cm
    仅改变衰减系
    数厚度(T3)/cm
    Yuan等[26]
    法厚度/cm
    2009年12月19日*JZ9-353.511.425.68.067.938.95
    2010年1月6日*JZ9-38616.69.4913.6611.5412.7
    2010年1月11日*JZ20-25314.245.888.479.99.28
    2010年1月24日*JZ9-31512.513.66.399.29.457.99
    2010年2月5日*JZ9-3201424.7614.1620.3717.215.65
    2010年2月16日*JZ20-28611.385.598.057.911.61
    2010年2月16日*JZ9-3644.040.520.742.812.49
    2010年1月29日*JZ20-2435.922.663.834.113.37
    2010年2月12日*JZ9-38610.95.778.37.579.85
    2013年1月26日*JZ20-285.512.236.749.718.511.21
    2013年2月2日*JX1-1107.510.656.859.857.410.87
    2013年2月2日*JZ25-1S3022.517.0911.2916.2511.8714.81
    2013年12月28日*JZ20-2421.710.821.181.191.45
    2014年1月12日JZ20-243.517.8410.7815.5212.413.8
    2014年1月18日JZ9-3104.510.945.578.027.610
    2014年2月11日JZ20-28412.376.849.848.5911.61
    2016年1月7日JZ9-31269.223.975.726.416.85
    2016年1月8日JZ9-313810.444.56.487.257.25
    2016年1月9日JZ20-2197.210.146.088.757.0510.45
    2016年1月12日JZ20-2135.810.295.217.57.158.64
    2016年1月13日JZ20-2135.512.464.66.628.668.01
    2016年1月18日JZ20-210520.5612.0917.4114.2814.42
    2020年12月31日JZ9-314712.687.9911.498.8113.41
    2021年1月1日JZ9-3126.517.298.9512.8912.0114.83
    2021年1月7日JZ20-214714.019.113.19.7414.35
    2021年1月8日JZ9-314822.0213.6219.615.317.68
    2021年1月10日JZ20-212619.599.8214.1313.6114.65
    2021年1月13日JZ9-310718.6310.6915.3912.9515.35
    2021年1月17日JZ9-314915.597.9911.510.8313.78
    平均实测厚度误差平均误差6.660.493.662.574.13
    平均绝对误差7.052.744.723.725.17
    均方根误差8.253.755.84.735.94
    相关系数0.4340.4850.4850.4340.417
    最大实测厚度
    误差
    平均误差2.37−3.810.631.720.16
    平均绝对误差4.734.674.043.873.96
    均方根误差6.026.095.235.254.99
    相关系数0.4350.4800.4800.4350.459
    注:T0为算法改进前的冰厚反演结果;T1为算法改进后的冰厚反演结果;T2为仅改进海水反照率的冰厚反演结果;T3为仅改进衰减系数的冰厚反演结果。日期后标注*的数据来源于参考文献[24, 35]。
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-01-07
  • 修回日期:  2022-06-12
  • 网络出版日期:  2022-10-24
  • 刊出日期:  2023-01-17

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