Update on the Temperature Corrections of Global Air-Sea CO2 Flux Estimates
Update on the Temperature Corrections of Global Air-Sea CO2 Flux Estimates
复制标题
全球海气二氧化碳通量估算的温度修正更新
DOI：
10.1002/essoar.10510573.1
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Dong Y
中科院分区：
文献类型：
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作者：
Dong Y
海洋是一个主要的碳汇。海表温度（SST）是从地面观测计算海-气二氧化碳（CO2）通量的关键变量。SST或任何上层海洋垂直温度梯度的任何偏差（例如，冷集肤效应）潜在地在CO2通量估计中产生偏差。最近的一项研究表明，由于这种温度效应，全球海洋CO2吸收量大幅增加（约50%或约0.9 Pg C yr-1）。在这里，我们使用金标准浮标SST数据集作为参考，以评估用于通量计算的现场SST的准确性。然后，使用物理模型来估计随纬度变化的冷表皮效应。偏差校正的SST（由浮标SST评估）加上基于物理学的冷表皮校正，从1982年到2020年，平均海洋CO2吸收量增加了1.35%（0.6 Pg C yr-1），这大大小于以前的校正。在考虑了这些温度因素之后，我们基于基于地表观测通量估计的集合估计了1994年至2007年海洋平均净CO2吸收量为2.2 ± 0.4 Pg C yr− 1，与独立的内部海洋碳储存估计值（2.1 ± 0.4 Pg C yr−1）一致。
The oceans are a major carbon sink. Sea surface temperature (SST) is a crucial variable in the calculation of the air‐sea carbon dioxide (CO2) flux from surface observations. Any bias in the SST or any upper ocean vertical temperature gradient (e.g., the cool skin effect) potentially generates a bias in the CO2flux estimates. A recent study suggested a substantial increase (∼50% or ∼0.9 Pg C yr−1) in the global ocean CO2uptake due to this temperature effect. Here, we use a gold standard buoy SST data set as the reference to assess the accuracy of insitu SST used for flux calculation. A physical model is then used to estimate the cool skin effect, which varies with latitude. The bias‐corrected SST (assessed by buoy SST) coupled with the physics‐based cool skin correction increases the average ocean CO2uptake by ∼35% (0.6 Pg C yr−1) from 1982 to 2020, which is substantially smaller than the previous correction. After these temperature considerations, we estimate an average net ocean CO2uptake of 2.2 ± 0.4 Pg C yr−1from 1994 to 2007 based on an ensemble of surface observation‐based flux estimates, in line with the independent interior ocean carbon storage estimate corrected for the river induced natural outgassing flux (2.1 ± 0.4 Pg C yr−1).