R. C. Barrett, B. R. Carter, A. J. Fassbender, B. Tilbrook, R. J. Woosley, K. Azetsu-Scott, R. A. Feely, C. Goyet, M. Ishii, A. Murata, F. F. Pérez
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引用次数: 0
摘要
由于人为排放增加,海洋对二氧化碳的吸收增加,导致 pH 值降低(海洋酸化),据推测这将削弱生物钙化作用,减少总碱度(AT)以碳酸盐矿物形式从表层海洋输出或埋藏在沿岸沉积物中。这种 "CO2-生物钙化反馈 "是大气 CO2 的负反馈,因为表层 AT 水平的升高会增加海洋吸收 CO2 的能力。我们利用重复水文测量和海水属性预测算法,首次在全球海洋中发现了这种反馈的特征。在过去 30 年中,我们发现全球表层 AT 增加了 0.072 ± 0.023 μmol kg-1 yr-1,这将导致表层海洋中额外积累约 20 Tmol 的 AT。这一发现表明,人为二氧化碳排放正在通过扰乱生物模式,对地球范围内的碳循环造成可测量的干扰。需要对反式脂肪酸进行更多的观测,以了解这种反馈在区域基础上的影响,并充分确定其降低海洋二氧化碳去除技术效率的潜力。
Biological Responses to Ocean Acidification Are Changing the Global Ocean Carbon Cycle
Increased oceanic uptake of CO2 due to rising anthropogenic emissions has caused lowered pH levels (ocean acidification) that are hypothesized to diminish biotic calcification and reduce the export of total alkalinity (AT) as carbonate minerals from the surface ocean or their burial in coastal sediments. This “CO2-biotic calcification feedback” is a negative feedback on atmospheric CO2, as elevated levels of surface AT increase the ocean's capacity to uptake CO2. We detect signatures of this feedback in the global ocean for the first time using repeat hydrographic measurements and seawater property prediction algorithms. Over the course of the past 30 years, we find an increase in global surface AT of 0.072 ± 0.023 μmol kg−1 yr−1, which would have caused approximately 20 Tmol of additional AT to accumulate in the surface ocean. This finding suggests that anthropogenic CO2 emissions are measurably perturbing the cycling of carbon on a planetary scale by disrupting biological patterns. More observations of AT would be required to understand the effects of this feedback on a regional basis and to fully characterize its potential to reduce the efficiency of marine carbon dioxide removal technology.
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.