HY-1C卫星海岸带成像仪叶绿素<i>a</i>浓度反演研究

滕越; 邹斌; 叶小敏

doi:10.12284/hyxb2022052

HY-1C卫星海岸带成像仪叶绿素a浓度反演研究

doi: 10.12284/hyxb2022052

滕越^{1, 2, 3,},
邹斌^{2, 3, ,},
叶小敏^{2, 3}

1.
国家海洋环境预报中心，北京 100081
2.
国家卫星海洋应用中心，北京 100081
3.
自然资源部空间海洋遥感与应用研究重点实验室，北京 100081

基金项目: 民用航天技术预先研究项目（D040107）

详细信息

作者简介:
滕越（1997—），女，山东省德州市人，主要从事海洋遥感水色要素的研究。E-mail: a122902@qq.com

通讯作者:
邹斌（1969—），男，河南省信阳市人，研究员，主要从事海洋遥感应用研究。E-mail: zoubin@mail.nsoas.org.cn

中图分类号: X834；P714
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出版历程
- 收稿日期: 2021-07-21
- 修回日期: 2021-11-12
- 网络出版日期: 2022-06-15
- 刊出日期: 2022-06-15

Study on the chlorophyll a concentration retrieved from HY-1C satellite coastal zone imager data

Teng Yue^{1, 2, 3
,},
Zou Bin^{2, 3
, ,},
Ye Xiaomin^{2, 3}

1.
National Marine Environmental Forecasting Center, Beijing 100081, China
2.
National Satellite Ocean Application Service, Beijing 100081, China
3.
Key Laboratory of Space Ocean Remote Sensing and Application, State Oceanic Administration, Beijing 100081, China

摘要

摘要: 叶绿素a作为最重要的水质参数之一，是评价水体富营养化和初级生产力状况的主要因素。我国海洋一号C（HY-1C）卫星海岸带成像仪（CZI）具有高时空分辨率的观测优势。本文基于东海和南海现场实测数据建立了HY-1C卫星CZI叶绿素a浓度反演模型并在实测水域进行反演，与MODIS叶绿素a浓度反演产品进行了对比验证，应用CZI叶绿素a浓度模型在珠江口、长江口、渤海湾水域进行了叶绿素a浓度反演示例试验。结果表明，叶绿素a浓度模型估算浓度与实测浓度相关系数为0.774 3，平均相对误差为24.58%，利用实测叶绿素a浓度对模型进行精度验证，相关系数达到0.993 9，平均相对误差为18.49%。模型在实测水域反演得到的叶绿素a浓度分布与MODIS叶绿素a浓度产品分布大体一致。在珠江口水域反演得到叶绿素a浓度空间分布为由西北向东南逐级递减，峰值出现在珠江口西沿岸。在长江口、渤海湾反演叶绿素a浓度空间分布均符合地理实情。研究表明HY-1C卫星CZI数据可应用于中国近海水色定量化研究。
- HY-1C卫星 /
- 海岸带成像仪 /
- 叶绿素a浓度 /
- 珠江口
Abstract: As one of the most important water quality parameters, chlorophyll a is an important indicator to evaluate the degree of eutrophication of water bodies and also the main factors of primary productivity state of the oceans. The coastal zone imager (CZI) onboard the Chinese Haiyang-1C (HY-1C) satellite has an advantage observation in high temporal and spatial resolution. In this study, a chlorophyll a concentration retrieval model for CZI onboard the HY-1C satellite is developed from the in-situ measurements in the East China Sea and the South China Sea. The chlorophyll a concentration is retrieved by the model in the measured waters and compared with MODIS chlorophyll a concentration. The chlorophyll a concentration also retrieved in the Zhujiang River Estuary, Changjiang River Estuary and Bohai Bay. The correlation coefficient between the predicted value of the model and the in-situ chlorophyll a concentration is 0.774 3, the average relative error is 24.58%. The accuracy of the model is verified with the in-situ measurements with the correlation coefficient of 0.993 9 and the average relative error of 18.49%. The distribution of chlorophyll a concentration retrieved from CZI is nearly the same as that of MODIS. The chlorophyll a concentration decreases gradually from northwest to southeast and the peak value locates on the west bank of the Zhujiang River Estuary. The inversion of chlorophyll a concentration in Changjiang River Estuary and Bohai Bay accords with the actual situation. The work in this study indicates that HY-1C satellite coastal zone imager data are useful for the monitoring of coastal ocean color in China.
- HY-1C satellite /
- coastal zone imager /
- chlorophyll a concentration /
- Zhujiang River Estuary

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图 1 2018年9月、10月东海和南海叶绿素a浓度实测站点分布

Fig. 1 Cruise locations of in situ chlorophyll a concentration sites in the East China Sea and South China Sea in September and October 2018

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图 2 模型估算的叶绿素a浓度与实测叶绿素a浓度关系

Fig. 2 The relationship between the chlorophyll a concentration estimated by the model and the measured chlorophyll a concentration

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图 3 海南岛周围HY-1C卫星海岸带成像仪遥感影像

观测时间：2019年9月26日

Fig. 3 Images acquired by coastal zone imager onboard the HY-1C satellite near the Hainan Island

Imaging time: September 26, 2019

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图 4 珠江口水域HY-1C卫星海岸带成像仪遥感影像

Fig. 4 Images acquired by coastal zone imager onboard the HY-1C satellite of the Zhujiang River Estuary waters

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图 5 海南岛周围叶绿素a浓度海岸带成像仪反演结果

a. 海岸带成像仪叶绿素a浓度反演结果；b. MODIS 叶绿素a浓度反演结果

Fig. 5 Chlorophyll a concentration retrieved from coastal zone imager in the offshore water around Hainan Island

a. Chlorophyll a concentration retrieved from coastal zone imager; b. chlorophyll a concentration retrieved from MODIS

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图 6 珠江口叶绿素a浓度海岸带成像仪反演结果

Fig. 6 Chlorophyll a concentration retrieved from coastal zone imager in the Zhujiang River Estuary

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图 7 长江口及其邻近水域叶绿素a浓度海岸带成像仪反演结果

Fig. 7 Chlorophyll a concentration retrieved from coastal zone imager in the Changjiang River Estuary and its adjacent waters

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图 8 渤海湾叶绿素a浓度海岸带成像仪反演结果

Fig. 8 Chlorophyll a concentration retrieved from coastal zone imager in the Bohai Bay

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表 1 HY-1C 卫星海岸带成像仪的基本参数

Tab. 1 Basic parameters of coastal zone imager onboard HY-1C satellite

太阳同步回归轨道波段/μm	不同波段应用对象
0.42～0.50	叶绿素、污染、冰、浅海地形
0.52～0.60	叶绿素、低浓度泥沙、污染、滩涂
0.61～0.69	中等浓度泥沙、植被、土壤
0.76～0.89	植被、高浓度泥沙、大气校正
注：星下点分辨率为50 m；幅宽≥950 km；太阳同步回归轨道高度：782 km；太阳同步回归轨道地方时：10:30AM±30 min。

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表 2 所用遥感数据基本参数

Tab. 2 The basic parameters of remote sensing data used

覆盖区域	序号	载荷/卫星	成像时间
海南岛	1	CZI/HY-1C	2019年9月26日 03:28
	2	CZI/HY-1C	2019年9月26日 03:29
珠江口	3	CZI/HY-1C	2020年1月30日 03:28
	4	CZI/ HY-1C	2020年2月26日 03:28
	5	CZI/ HY-1C	2020年10月11日 03:25
	6	CZI/ HY-1C	2020年11月22日 03:24
	7	CZI/ HY-1C	2020年12月4日 03:24
长江口	8	CZI/ HY-1C	2020年11月8日 02:48
	9	CZI/ HY-1C	2020年11月8日 02:49
渤海湾	10	CZI/ HY-1C	2020年10月26日 03:20

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