Weakening Indian Ocean carbon uptake in 2015: The role of amplified basin-wide warming and reduced Indonesian throughflow

IF 5.1 2区 地球科学 Q1 LIMNOLOGY Limnology and Oceanography Letters Pub Date : 2024-04-17 DOI:10.1002/lol2.10397
Enhui Liao, Wenfang Lu, Liang Xue, Yan Du
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Abstract

In 2015, the Indian Ocean exhibits an exceptionally weakened CO2 uptake, highlighting strong interannual variability of ocean carbon sink. By utilizing multiple ocean CO2 partial pressure (pCO2) data and a state-of-the-art ocean biogeochemical model, we show that the 2015 ocean CO2 anomaly is characterized by a basin-wide amplification of ocean pCO2, differing from ocean pCO2 responses to other Indian Ocean Dipole events (e.g., 1997 and 2019). The distinct ocean pCO2 anomaly is attributed to an amplified warming and an unprecedented weakening Indonesian Throughflow under the influence of co-occurrence of positive IOD and extreme El Niño in 2015. The amplified warming drives higher ocean pCO2 in the western and central Indian Ocean, while the ITF transports anomalously high ocean pCO2 water from the Pacific Ocean to the southeastern Indian Ocean. This newly identified ocean carbon response provides deeper insights into the Indian Ocean carbon interannual variability.

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2015 年印度洋碳吸收减弱:全流域变暖和印度尼西亚通流减少的作用
2015 年,印度洋对二氧化碳的吸收异常减弱,凸显了海洋碳汇强烈的年际变化。通过利用多种海洋二氧化碳分压(pCO2)数据和最先进的海洋生物地球化学模式,我们表明 2015 年海洋二氧化碳异常的特点是海洋 pCO2 在全海盆范围内的放大,不同于其他印度洋偶极子事件(如 1997 年和 2019 年)的海洋 pCO2 反应。这种独特的海洋 pCO2 异常归因于 2015 年同时发生的正 IOD 和极端厄尔尼诺现象的影响下,印尼贯穿流的扩大和前所未有的减弱。变暖的扩大推动了印度洋西部和中部海洋 pCO2 的升高,而 ITF 则将异常高的海洋 pCO2 水从太平洋输送到印度洋东南部。这一新发现的海洋碳响应使人们对印度洋碳年际变化有了更深入的了解。
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来源期刊
CiteScore
10.00
自引率
3.80%
发文量
63
审稿时长
25 weeks
期刊介绍: Limnology and Oceanography Letters (LO-Letters) serves as a platform for communicating the latest innovative and trend-setting research in the aquatic sciences. Manuscripts submitted to LO-Letters are expected to present high-impact, cutting-edge results, discoveries, or conceptual developments across all areas of limnology and oceanography, including their integration. Selection criteria for manuscripts include their broad relevance to the field, strong empirical and conceptual foundations, succinct and elegant conclusions, and potential to advance knowledge in aquatic sciences.
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