2022/23 年大盐生地区海洋热浪及其对表层下溶解氧的影响

IF 1.3 4区 地球科学 Q4 OCEANOGRAPHY
Yoshimi Kawai, Eitarou Oka, Kanako Sato, Shigeki Hosoda, Shoichiro Kido
{"title":"2022/23 年大盐生地区海洋热浪及其对表层下溶解氧的影响","authors":"Yoshimi Kawai, Eitarou Oka, Kanako Sato, Shigeki Hosoda, Shoichiro Kido","doi":"10.1007/s10872-024-00731-x","DOIUrl":null,"url":null,"abstract":"<p>The Oyashio region east of northern Japan has experienced frequent marine heatwaves (MHWs) since 2010, and in the summer and fall of 2022, sea surface temperature hit a record high as of that year. This study examined the impact of the 2022/23 MHW on dissolved oxygen (DO) by analyzing observations from a vessel and biogeochemical Argo floats. It was found that warm saline water from the Kuroshio Current intruded at ~ 42°N in July. DO anomalies from the climatology above a depth of 200 m were negatively correlated with the temperature anomalies at the same depth, while the opposite was true for deeper depths. In the density coordinate, DO and temperature anomalies exhibited a strong negative correlation when the potential density (<i>σ</i><sub>θ</sub>) was less than ~ 27.0 kg m<sup>−3</sup>. Thus, it was demonstrated that subsurface DO anomalies could be statistically predicted from temperature and salinity fields using this relationship. Notably, DO anomalies could be divided into components related to isopycnal mixing and density-surface heaving. This decomposition revealed a dynamical process, whereby the intrusion of the Kuroshio water, which is lighter than the Oyashio water, pushed down the density surfaces, causing oxygenation. Meanwhile, isopycnal mixing tended to mitigate the increase of DO concentration since DO concentration was smaller in the south than in the north on an isopycnal surface of <i>σ</i><sub>θ</sub> &lt; 27.0 kg m<sup>−3</sup>. This study clarified that, during the 2022/23 MHW, deoxygenation occurred near the surface owing the warming, whereas the DO concentration increased in the subsurface layer.</p>","PeriodicalId":16640,"journal":{"name":"Journal of Oceanography","volume":"122 1","pages":""},"PeriodicalIF":1.3000,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Marine heatwave in the Oyashio region in 2022/23 and its impact on subsurface dissolved oxygen\",\"authors\":\"Yoshimi Kawai, Eitarou Oka, Kanako Sato, Shigeki Hosoda, Shoichiro Kido\",\"doi\":\"10.1007/s10872-024-00731-x\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>The Oyashio region east of northern Japan has experienced frequent marine heatwaves (MHWs) since 2010, and in the summer and fall of 2022, sea surface temperature hit a record high as of that year. This study examined the impact of the 2022/23 MHW on dissolved oxygen (DO) by analyzing observations from a vessel and biogeochemical Argo floats. It was found that warm saline water from the Kuroshio Current intruded at ~ 42°N in July. DO anomalies from the climatology above a depth of 200 m were negatively correlated with the temperature anomalies at the same depth, while the opposite was true for deeper depths. In the density coordinate, DO and temperature anomalies exhibited a strong negative correlation when the potential density (<i>σ</i><sub>θ</sub>) was less than ~ 27.0 kg m<sup>−3</sup>. Thus, it was demonstrated that subsurface DO anomalies could be statistically predicted from temperature and salinity fields using this relationship. Notably, DO anomalies could be divided into components related to isopycnal mixing and density-surface heaving. This decomposition revealed a dynamical process, whereby the intrusion of the Kuroshio water, which is lighter than the Oyashio water, pushed down the density surfaces, causing oxygenation. Meanwhile, isopycnal mixing tended to mitigate the increase of DO concentration since DO concentration was smaller in the south than in the north on an isopycnal surface of <i>σ</i><sub>θ</sub> &lt; 27.0 kg m<sup>−3</sup>. This study clarified that, during the 2022/23 MHW, deoxygenation occurred near the surface owing the warming, whereas the DO concentration increased in the subsurface layer.</p>\",\"PeriodicalId\":16640,\"journal\":{\"name\":\"Journal of Oceanography\",\"volume\":\"122 1\",\"pages\":\"\"},\"PeriodicalIF\":1.3000,\"publicationDate\":\"2024-09-03\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Oceanography\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://doi.org/10.1007/s10872-024-00731-x\",\"RegionNum\":4,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"OCEANOGRAPHY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Oceanography","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1007/s10872-024-00731-x","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"OCEANOGRAPHY","Score":null,"Total":0}
引用次数: 0

摘要

自 2010 年以来,日本北部以东的大盐生地区频繁出现海洋热浪(MHW),2022 年夏秋季的海面温度创下了当年的最高纪录。本研究通过分析船只和生物地球化学 Argo 浮标的观测数据,研究了 2022/23 年 MHW 对溶解氧(DO)的影响。研究发现,来自黑潮的暖咸水于 7 月份侵入北纬约 42 度。从气候学角度看,200 米深度以上的溶解氧异常与同一深度的温度异常呈负相关,而更深的深度则相反。在密度坐标中,当潜在密度(σθ)小于 ~ 27.0 kg m-3 时,溶解氧和温度异常表现出强烈的负相关。因此,利用这种关系可以从温度场和盐度场统计预测地下溶解氧异常。值得注意的是,溶解氧异常可分为与等压混合和密度-表层翻腾有关的部分。这种分解揭示了一个动态过程,即黑潮水(比大雅叙海水轻)的侵入推低了密度面,从而导致含氧量增加。同时,等压面混合有减缓溶解氧浓度增加的趋势,因为在 σθ < 27.0 kg m-3 的等压面上,南部的溶解氧浓度小于北部。这项研究表明,在 2022/23 年中高纬度期间,由于气候变暖,表层附近出现了脱氧现象,而次表层的溶解氧浓度则有所增加。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Marine heatwave in the Oyashio region in 2022/23 and its impact on subsurface dissolved oxygen

Marine heatwave in the Oyashio region in 2022/23 and its impact on subsurface dissolved oxygen

The Oyashio region east of northern Japan has experienced frequent marine heatwaves (MHWs) since 2010, and in the summer and fall of 2022, sea surface temperature hit a record high as of that year. This study examined the impact of the 2022/23 MHW on dissolved oxygen (DO) by analyzing observations from a vessel and biogeochemical Argo floats. It was found that warm saline water from the Kuroshio Current intruded at ~ 42°N in July. DO anomalies from the climatology above a depth of 200 m were negatively correlated with the temperature anomalies at the same depth, while the opposite was true for deeper depths. In the density coordinate, DO and temperature anomalies exhibited a strong negative correlation when the potential density (σθ) was less than ~ 27.0 kg m−3. Thus, it was demonstrated that subsurface DO anomalies could be statistically predicted from temperature and salinity fields using this relationship. Notably, DO anomalies could be divided into components related to isopycnal mixing and density-surface heaving. This decomposition revealed a dynamical process, whereby the intrusion of the Kuroshio water, which is lighter than the Oyashio water, pushed down the density surfaces, causing oxygenation. Meanwhile, isopycnal mixing tended to mitigate the increase of DO concentration since DO concentration was smaller in the south than in the north on an isopycnal surface of σθ < 27.0 kg m−3. This study clarified that, during the 2022/23 MHW, deoxygenation occurred near the surface owing the warming, whereas the DO concentration increased in the subsurface layer.

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 Oceanography
Journal of Oceanography 地学-海洋学
CiteScore
3.50
自引率
13.00%
发文量
42
审稿时长
6-12 weeks
期刊介绍: The Journal of Oceanography is the official journal of the Oceanographic Society of Japan and open to all oceanographers in the world. The main aim of the journal is to promote understandings of ocean systems from various aspects including physical, chemical, biological, geological oceanography as well as paleoceanography, etc. The journal welcomes research focusing on the western North Pacific and Asian coastal waters, but the study region is not limited to the Asian Pacific. The journal publishes original articles, short contributions, reviews, and correspondence in oceanography and related fields.
×
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