沿海海洋酸化和缺氧的极端情况和短期波动

IF 3.3 2区 地球科学 Q1 OCEANOGRAPHY
Pierre Damien, Daniele Bianchi, Faycal Kessouri, James C. McWilliams
{"title":"沿海海洋酸化和缺氧的极端情况和短期波动","authors":"Pierre Damien,&nbsp;Daniele Bianchi,&nbsp;Faycal Kessouri,&nbsp;James C. McWilliams","doi":"10.1029/2024JC021197","DOIUrl":null,"url":null,"abstract":"<p>In Eastern boundary upwelling systems, such as the California Current System (CCS), seasonal upwelling brings low oxygen and low pH waters to the continental shelf, causing ocean acidification and hypoxia (OAH). The location, frequency, and intensity of OAH events is influenced by a combination of large-scale climatic trends, seasonal changes, small-scale circulation, and local human activities. Here, we use results from two 20-year long submesoscale-resolving simulations of the Northern and Southern U.S. West Coast (USWC) for the 1997–2017 period, to describe the characteristics and drivers of OAH events. These simulations reveal the emergence of hotspots in which seasonal declines in oxygen and pH are accompanied by localized short-term extremes in OAH. While OAH hotspots show substantial seasonal variability, significant intra-seasonal fluctuations occur, reflecting the interaction between low- and high-frequency forcings that shape OAH events. The mechanisms behind the seasonal decreases in pH and oxygen vary along the USWC. While remineralization remains the dominant force causing these declines throughout the coast, physical transport partially offsets these effects in Southern and Central California, but contributes to seasonal oxygen loss and acidification on the Northern Coast. Critically, the seasonal decline is not sufficient to predict the occurrence and duration of OAH extremes. Locally enhanced biogeochemical rates, including shallow benthic remineralization and rapid wind-driven transport, shape the spatial and temporal patterns of coastal OAH.</p>","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"129 11","pages":""},"PeriodicalIF":3.3000,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JC021197","citationCount":"0","resultStr":"{\"title\":\"Extremes and Short-Term Fluctuations in Coastal Ocean Acidification and Hypoxia\",\"authors\":\"Pierre Damien,&nbsp;Daniele Bianchi,&nbsp;Faycal Kessouri,&nbsp;James C. McWilliams\",\"doi\":\"10.1029/2024JC021197\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>In Eastern boundary upwelling systems, such as the California Current System (CCS), seasonal upwelling brings low oxygen and low pH waters to the continental shelf, causing ocean acidification and hypoxia (OAH). The location, frequency, and intensity of OAH events is influenced by a combination of large-scale climatic trends, seasonal changes, small-scale circulation, and local human activities. Here, we use results from two 20-year long submesoscale-resolving simulations of the Northern and Southern U.S. West Coast (USWC) for the 1997–2017 period, to describe the characteristics and drivers of OAH events. These simulations reveal the emergence of hotspots in which seasonal declines in oxygen and pH are accompanied by localized short-term extremes in OAH. While OAH hotspots show substantial seasonal variability, significant intra-seasonal fluctuations occur, reflecting the interaction between low- and high-frequency forcings that shape OAH events. The mechanisms behind the seasonal decreases in pH and oxygen vary along the USWC. While remineralization remains the dominant force causing these declines throughout the coast, physical transport partially offsets these effects in Southern and Central California, but contributes to seasonal oxygen loss and acidification on the Northern Coast. Critically, the seasonal decline is not sufficient to predict the occurrence and duration of OAH extremes. Locally enhanced biogeochemical rates, including shallow benthic remineralization and rapid wind-driven transport, shape the spatial and temporal patterns of coastal OAH.</p>\",\"PeriodicalId\":54340,\"journal\":{\"name\":\"Journal of Geophysical Research-Oceans\",\"volume\":\"129 11\",\"pages\":\"\"},\"PeriodicalIF\":3.3000,\"publicationDate\":\"2024-11-16\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JC021197\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Geophysical Research-Oceans\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1029/2024JC021197\",\"RegionNum\":2,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"OCEANOGRAPHY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Geophysical Research-Oceans","FirstCategoryId":"89","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1029/2024JC021197","RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"OCEANOGRAPHY","Score":null,"Total":0}
引用次数: 0

摘要

在东边界上升流系统中,如加利福尼亚洋流系统(CCS),季节性上升流会将低氧和低 pH 值的海水带到大陆架上,造成海洋酸化和缺氧(OAH)。OAH 事件的位置、频率和强度受到大尺度气候趋势、季节变化、小尺度环流和当地人类活动的综合影响。在此,我们利用 1997-2017 年期间美国西海岸北部和南部两个长达 20 年的次中尺度分辨率模拟结果,来描述 OAH 事件的特征和驱动因素。这些模拟结果表明,在氧气和 pH 值季节性下降的同时,出现了局部短期极端 OAH 热点。虽然 OAH 热点显示出很大的季节变异性,但也出现了显著的季节内波动,反映了形成 OAH 事件的低频和高频作用力之间的相互作用。美国西部海盆沿岸 pH 值和氧气季节性下降的机理各不相同。虽然再矿化作用仍是导致整个沿岸地区pH值和氧指数下降的主要原因,但物理迁移在一定程度上抵消了南加州和中加州的这些影响,但却导致了北海岸的季节性氧损失和酸化。重要的是,季节性衰退不足以预测 OAH 极端事件的发生和持续时间。在南加州和中加 州,生物地球化学速率的提高,包括浅层底栖生物的再矿化和风力驱动的快速传输,形 成了沿岸 OAH 的时空模式。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Extremes and Short-Term Fluctuations in Coastal Ocean Acidification and Hypoxia

Extremes and Short-Term Fluctuations in Coastal Ocean Acidification and Hypoxia

In Eastern boundary upwelling systems, such as the California Current System (CCS), seasonal upwelling brings low oxygen and low pH waters to the continental shelf, causing ocean acidification and hypoxia (OAH). The location, frequency, and intensity of OAH events is influenced by a combination of large-scale climatic trends, seasonal changes, small-scale circulation, and local human activities. Here, we use results from two 20-year long submesoscale-resolving simulations of the Northern and Southern U.S. West Coast (USWC) for the 1997–2017 period, to describe the characteristics and drivers of OAH events. These simulations reveal the emergence of hotspots in which seasonal declines in oxygen and pH are accompanied by localized short-term extremes in OAH. While OAH hotspots show substantial seasonal variability, significant intra-seasonal fluctuations occur, reflecting the interaction between low- and high-frequency forcings that shape OAH events. The mechanisms behind the seasonal decreases in pH and oxygen vary along the USWC. While remineralization remains the dominant force causing these declines throughout the coast, physical transport partially offsets these effects in Southern and Central California, but contributes to seasonal oxygen loss and acidification on the Northern Coast. Critically, the seasonal decline is not sufficient to predict the occurrence and duration of OAH extremes. Locally enhanced biogeochemical rates, including shallow benthic remineralization and rapid wind-driven transport, shape the spatial and temporal patterns of coastal OAH.

求助全文
通过发布文献求助,成功后即可免费获取论文全文。 去求助
来源期刊
Journal of Geophysical Research-Oceans
Journal of Geophysical Research-Oceans Earth and Planetary Sciences-Oceanography
CiteScore
7.00
自引率
13.90%
发文量
429
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信