Fingerprint of climate change on Southern Ocean carbon storage
Fingerprint of climate change on Southern Ocean carbon storage
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气候变化对南大洋碳储存的影响
DOI：
10.1002/essoar.10512597.1
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Wright R
中科院分区：
文献类型：
--
作者：
Wright R
南大洋在全球海洋吸收、运输和储存碳方面发挥着至关重要的作用。它是海洋最大的二氧化碳汇，但也是人为碳储存量最低的地区之一。这种行为是由强风驱动深水上升和表面碳俯冲和向北输送的独特组合造成的。在这里，我们结合建模和观测，确定了与气候相关的海洋条件变化的间接影响，相对于大气二氧化碳的人为变化对南大洋碳重组的直接影响。我们发现，与 1995 年左右的气候相比，1998-2018 年期间气候变率和气候变化对南大洋碳储存的影响几乎与人为二氧化碳的影响一样大。我们在溶解无机碳 (DIC) 中发现了明显的气候指纹，表层海洋中 DIC 浓度升高增强了人为二氧化碳信号，而地下海洋中 DIC 浓度降低抵消了人为二氧化碳信号。二氧化碳信号。指纹在低纬度地区 (30°S-55°S) 最强。该指纹可以用来监测这个关键海洋盆地内高度不确定的碳演化，并更好地识别其驱动因素。
The Southern Ocean plays a critical role in the uptake, transport and storage of carbon by the global oceans. It is the ocean’s largest sink of CO2, yet it is also among the regions with the lowest storage of anthropogenic carbon. This behaviour results from the unique combination of high winds driving the upwelling of deep waters and the subduction and northwards transport of surface carbon. Here we identify the indirect effect of climate-related changes in ocean conditions relative to the direct effect of anthropogenic changes in atmospheric CO2 on the reorganisation of carbon in the Southern Ocean using a combination of modelling and observations. We show that the effect of climate variability and climate change on the storage of carbon in the Southern Ocean is nearly as large as the effect of anthropogenic CO2 during the period 1998-2018 compared with a climatology around the year 1995. We identify a distinct climate fingerprint in dissolved inorganic carbon (DIC), with elevated DIC concentration in the surface ocean that reinforces the anthropogenic CO2 signal, and reduced DIC concentration in the subsurface ocean that offsets the anthropogenic CO2 signal. The fingerprint is strongest at lower latitudes (30°S-55°S). This fingerprint could serve to monitor the highly uncertain evolution of carbon within this critical ocean basin, and better identify its drivers.