夏季珠江口海域海水CO2分压的卫星遥感反演

吕航宇; 白雁; 李骞; 江洪

doi:10.3969/j.issn.1001-909X.2018.02.001

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海洋学研究 ›› 2018, Vol. 36 ›› Issue (2) : 1-11. DOI: 10.3969/j.issn.1001-909X.2018.02.001

研究论文

夏季珠江口海域海水CO₂分压的卫星遥感反演

吕航宇¹, 白雁^*2,3, 李骞^4,5, 江洪¹

作者信息 +

Satellite remote sensing retrieval of aquatic pCO₂ in summer in the Pearl River Estuary

LÜ Hang-yu¹, BAI Yan^*2,3, LI Qian^4,5, JIANG Hong¹

Author information +

文章历史 +

摘要

基于控制因子分析的方法,本研究建立了夏季珠江口海域海水CO₂分压(pCO₂)的遥感反演模型。基于珠江水与黑潮水的两端元混合,建立了水平混合和热力学作用的量化模型,并生成了查找表。同时,建立了基于黄色物质(含碎屑)吸收系数的盐度遥感算法,实现珠江口海域表层盐度的遥感反演。利用走航pCO₂和匹配的遥感叶绿素质量浓度产品,建立了生物作用的量化模型。通过集成水平混合和生物作用,最终实现夏季珠江口海域pCO₂的遥感反演。与走航pCO₂比较表明,仅考虑水平混合和热力学作用的遥感结果会显著高估,考虑生物作用后,遥感结果无论在量值和空间变化趋势上均与实测结果相符。此外,遥感反演结果表明,夏季珠江口近岸水域为CO₂的汇区,而离岸的陆架水域则为CO₂的弱源。

Abstract

Based on the method of the controlling factors analyses, a satellite remote sensing algorithm was developed to retrieve the aquatic pCO₂ in the Pearl River Estuary in summer time. The end members of the Pearl River water and Kuroshio water were applied to quantify the pCO₂ variations controlled by the water mass mixing and thermal dynamic effects, and a look-up table was generated to fulfill the calculation. Moreover, relationship between the a_CDM(443 nm) and surface layer water salinity was established to retrieve the salinity from ocean color satellite data. In addition, based on the underway measured pCO₂ and matchup satellite Chl-a data, the model for the biological effect on the pCO₂ was developed. Finally, the mixing and biological effects on the pCO₂ were combined to retrieve the pCO₂ from the satellite. Based on the established model, the comparisons between the retrieved pCO₂ and underway measured pCO₂ were carried out. The results show that if only considering the mixing and thermal dynamic effects it would overestimate the pCO₂, while if considering the biological effect additionally it would much improve the results not only on the magnitudes, but also the variations. The satellite-retrieved pCO₂ also reveals that in summer time, the coastal region in the Pearl River Estuary is a sink of the atmosphere CO₂, while the outer shelf is a weak source of CO₂.

导出引用

吕航宇, 白雁, 李骞, 江洪. 夏季珠江口海域海水CO₂分压的卫星遥感反演[J]. 海洋学研究. 2018, 36(2): 1-11 https://doi.org/10.3969/j.issn.1001-909X.2018.02.001

LÜ Hang-yu, BAI Yan, LI Qian, JIANG Hong. Satellite remote sensing retrieval of aquatic pCO₂ in summer in the Pearl River Estuary[J]. Journal of Marine Sciences. 2018, 36(2): 1-11 https://doi.org/10.3969/j.issn.1001-909X.2018.02.001

中图分类号： TP79 P732

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