Jamie D. Shutler, Daniel J. Ford, Thomas Holding, Clement Ubelmann, Lucile Gaultier, Fabrice Collard, Bertrand Chapron, Marie-Helene Rio, Callum Roberts, Craig Donlon
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Analyzing these flows for fourteen shelf-seas based on their 20-year long-term gradient in air-sea partial pressure of carbon dioxide (their atmospheric CO<sub>2</sub> uptake tendency) identifies significant relationships between uptake tendency and winter (<i>r</i><sup>2</sup> = 0.72 ± 0.03, <i>p</i> < 0.01, <i>n</i> = 14) and autumn (<i>r</i><sup>2</sup> = 0.57 ± 0.05, <i>p</i> < 0.01, <i>n</i> = 14) wind-driven surface flows. These signals are most strong in winter, but the results are consistent at annual scales. Including the wintertime wind-driven air-sea CO<sub>2</sub> gas exchange further enhances this result, and collectively they describe 82% of the variance in the atmospheric CO<sub>2</sub> uptake tendency data (<i>r</i><sup>2</sup> = 0.82 ± 0.06, <i>p</i> < 0.01, <i>n</i> = 14). These findings identify that long-term wind-driven water flow and surface gas exchange are key mechanisms for controlling their chemical evolution and their status as CO<sub>2</sub> sinks. This observational-based evidence highlights the need for these wind-driven processes to be resolved within methods used to predict or understand continental shelf-sea carbonate system state and ocean health.</p>","PeriodicalId":12729,"journal":{"name":"Global Biogeochemical Cycles","volume":"39 9","pages":""},"PeriodicalIF":5.5000,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2024GB008461","citationCount":"0","resultStr":"{\"title\":\"Wind-Driven Control of Shelf-Sea CO2 Sinks\",\"authors\":\"Jamie D. Shutler, Daniel J. 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引用次数: 0
摘要
大陆架地表水被认为是大气二氧化碳(CO2)的可变但不断增加的汇,但控制这些不断增加的汇的机制尚不清楚。我们发现冬季风驱动的表层大气-海洋CO2气体交换和风驱动的水进入(或离开)陆架海的运动与许多陆架海的大气CO2吸收趋势是一致的。一项基于20年观测的分析表明,地转、风和波浪驱动的洋流都对地表陆架破裂水的速度有贡献,但每种洋流的主导作用取决于地点和季节。根据14个陆架海20年的大气二氧化碳分压(大气二氧化碳吸收趋势)长期梯度分析,发现吸收趋势与冬季(r2 = 0.72±0.03,p < 0.01, n = 14)和秋季(r2 = 0.57±0.05,p < 0.01, n = 14)风致地面流之间存在显著关系。这些信号在冬季最为强烈,但结果在年尺度上是一致的。冬季风驱动的海气CO2气体交换进一步强化了这一结果,它们共同描述了82%的大气CO2吸收趋势数据的方差(r2 = 0.82±0.06,p < 0.01, n = 14)。这些发现表明,长期的风驱动水流和地表气体交换是控制其化学演化和作为二氧化碳汇地位的关键机制。这一基于观测的证据强调了在预测或了解大陆架-海碳酸盐系统状态和海洋健康的方法中解决这些风驱动过程的必要性。
Continental shelf surface waters are considered a variable but increasing sink of atmospheric carbon dioxide (CO2), but the mechanisms controlling these increasing sinks are unclear. We identify that the winter wind-driven surface atmosphere-ocean CO2 gas exchange and wind-driven movement of water onto (or off of) shelf seas are consistent with the atmospheric CO2 uptake tendency of many shelf seas. A 20-year observational-based analysis shows that geostrophic, wind and wave driven currents all contribute to the surface shelf break water velocities, but the dominance of each is location and season dependent. Analyzing these flows for fourteen shelf-seas based on their 20-year long-term gradient in air-sea partial pressure of carbon dioxide (their atmospheric CO2 uptake tendency) identifies significant relationships between uptake tendency and winter (r2 = 0.72 ± 0.03, p < 0.01, n = 14) and autumn (r2 = 0.57 ± 0.05, p < 0.01, n = 14) wind-driven surface flows. These signals are most strong in winter, but the results are consistent at annual scales. Including the wintertime wind-driven air-sea CO2 gas exchange further enhances this result, and collectively they describe 82% of the variance in the atmospheric CO2 uptake tendency data (r2 = 0.82 ± 0.06, p < 0.01, n = 14). These findings identify that long-term wind-driven water flow and surface gas exchange are key mechanisms for controlling their chemical evolution and their status as CO2 sinks. This observational-based evidence highlights the need for these wind-driven processes to be resolved within methods used to predict or understand continental shelf-sea carbonate system state and ocean health.
期刊介绍:
Global Biogeochemical Cycles (GBC) features research on regional to global biogeochemical interactions, as well as more local studies that demonstrate fundamental implications for biogeochemical processing at regional or global scales. Published papers draw on a wide array of methods and knowledge and extend in time from the deep geologic past to recent historical and potential future interactions. This broad scope includes studies that elucidate human activities as interactive components of biogeochemical cycles and physical Earth Systems including climate. Authors are required to make their work accessible to a broad interdisciplinary range of scientists.