The Southern Ocean Carbon Cycle 1985-2018: Mean, Seasonal Cycle, Trends, and Storage
The Southern Ocean Carbon Cycle 1985-2018: Mean, Seasonal Cycle, Trends, and Storage
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1985-2018 年南大洋碳循环：平均值、季节循环、趋势和储存
DOI：
10.1029/2023gb007848
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发表时间：
2023
影响因子：
5.2
通讯作者：
Hauck J
中科院分区：
文献类型：
--
作者：
Hauck J
我们利用区域碳循环评估和处理项目第二阶段收集的数据集评估了南大洋的二氧化碳吸收情况。南大洋充当了二氧化碳的汇，全球海洋生物地球化学模型的模拟结果(GOBMS，0.75±0.28 pGC yr−1)与基于二氧化碳观测的产品(0.73±0.07 pGC yr−1)的模拟结果非常一致。对于相同的区域和时间范围，这一汇只有RECCAP1报告的一半。目前的净吸收是首先对大气中不断上升的二氧化碳做出反应，将大量人为二氧化碳(Cant)排放到海洋中，从而过度补偿自然二氧化碳向大气中的损失。一个明显的知识缺口是自2000年以来汇的增加，pCO2-Products表明增长强度和不确定性是GOBM的两倍多(分别为0.26±0.06和0.11±0.03 Pg/C/−110−1)。这是尽管GOBM和pCO2产品的pCO2趋势几乎相同，但这两种产品只在测量pCO2的地点进行了比较。季节分析显示，冬季的驾驶过程与放气大小的不确定性一致，而夏季的差异更基本，因为GOBM在模拟生物和混合/环流的非热过程的影响方面存在困难。坎特的海洋内部积累表明，低估了大洋钻探和GOBM中的储存。未来的工作需要将地表通量和内部海洋运输联系起来，建立早就应该建立的系统观测网络，并推动对碳循环驱动因素的更好的过程理解。
We assess the Southern Ocean CO2uptake (1985–2018) using data sets gathered in the REgional Carbon Cycle Assessment and Processes Project Phase 2. The Southern Ocean acted as a sink for CO2with close agreement between simulation results from global ocean biogeochemistry models (GOBMs, 0.75 ± 0.28 PgC yr−1) andpCO2‐observation‐based products (0.73 ± 0.07 PgC yr−1). This sink is only half that reported by RECCAP1 for the same region and timeframe. The present‐day net uptake is to first order a response to rising atmospheric CO2, driving large amounts of anthropogenic CO2(Cant) into the ocean, thereby overcompensating the loss of natural CO2to the atmosphere. An apparent knowledge gap is the increase of the sink since 2000, withpCO2‐products suggesting a growth that is more than twice as strong and uncertain as that of GOBMs (0.26 ± 0.06 and 0.11 ± 0.03 Pg C yr−1decade−1, respectively). This is despite nearly identicalpCO2trends in GOBMs andpCO2‐products when both products are compared only at the locations wherepCO2was measured. Seasonal analyses revealed agreement in driving processes in winter with uncertainty in the magnitude of outgassing, whereas discrepancies are more fundamental in summer, when GOBMs exhibit difficulties in simulating the effects of the non‐thermal processes of biology and mixing/circulation. Ocean interior accumulation of Cantpoints to an underestimate of Cantuptake and storage in GOBMs. Future work needs to link surface fluxes and interior ocean transport, build long overdue systematic observation networks and push toward better process understanding of drivers of the carbon cycle.