{"title":"Weakening Indian Ocean carbon uptake in 2015: The role of amplified basin-wide warming and reduced Indonesian throughflow","authors":"Enhui Liao, Wenfang Lu, Liang Xue, Yan Du","doi":"10.1002/lol2.10397","DOIUrl":null,"url":null,"abstract":"<p>In 2015, the Indian Ocean exhibits an exceptionally weakened CO<sub>2</sub> uptake, highlighting strong interannual variability of ocean carbon sink. By utilizing multiple ocean CO<sub>2</sub> partial pressure (<i>p</i>CO<sub>2</sub>) data and a state-of-the-art ocean biogeochemical model, we show that the 2015 ocean CO<sub>2</sub> anomaly is characterized by a basin-wide amplification of ocean <i>p</i>CO<sub>2</sub>, differing from ocean <i>p</i>CO<sub>2</sub> responses to other Indian Ocean Dipole events (e.g., 1997 and 2019). The distinct ocean <i>p</i>CO<sub>2</sub> 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 <i>p</i>CO<sub>2</sub> in the western and central Indian Ocean, while the ITF transports anomalously high ocean <i>p</i>CO<sub>2</sub> 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.</p>","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":null,"pages":null},"PeriodicalIF":5.1000,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.10397","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Limnology and Oceanography Letters","FirstCategoryId":"93","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/lol2.10397","RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"LIMNOLOGY","Score":null,"Total":0}
引用次数: 0
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.
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.