Satellite ocean color assessment of air‐sea fluxes of CO2 in a river‐dominated coastal margin
Satellite ocean color assessment of air‐sea fluxes of CO2 in a river‐dominated coastal margin
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DOI：
10.1029/2005gl023942
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发表时间：
2006-01
影响因子：
5.2
通讯作者：
S. Lohrenz;W. Cai
中科院分区：
文献类型：
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作者：
S. Lohrenz;W. Cai
受河流影响的边缘对区域二氧化碳通量的贡献很难量化，因为这些区域具有高度的时空变异性。我们描述了一种从墨西哥湾北部的MODIS图像中估算地表水二氧化碳分压(PCO2)的算法。通过主成分分析和多元回归分析，将表层PCO2与环境变量(T、S、叶绿素)进行相关性分析。随后从MODIS-AQUA L1B数据中检索相应的产品，可以评估二氧化碳的区域分布。密西西比河三角洲附近有一个明显的低二氧化碳区域，这与现场观测一致。区域地面大气到海洋的二氧化碳通量估计为2.0-4.2mmolCm−2 d−1。
Quantification of the contributions of river‐influenced margins to regional CO2 fluxes is difficult due to the high degree of spatial and temporal variability in these regions. We describe an algorithm for assessment of surface water partial pressure of CO2 (pCO2) from MODIS imagery in the northern Gulf of Mexico. Principal component analysis and multiple regression were used to relate surface pCO2 to environmental variables (T, S, chlorophyll). Subsequent retrieval of corresponding products from MODIS‐Aqua L1B data permitted the assessment of regional distributions of pCO2. An area of low pCO2 was evident in the vicinity of the Mississippi River delta, consistent with field observations. Regional surface air to sea fluxes of CO2 were estimated as 2.0–4.2 mmol C m−2 d−1.