Multi-month prediction of summertime hypoxia occurrence in the bottom of Funka Bay, Japan, with a focus on the wintertime surface heat flux

IF 2.7 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of Marine Systems Pub Date : 2025-01-01 DOI:10.1016/j.jmarsys.2024.104035
Chihiro Miki , Hiroto Abe , Hiroji Onishi , Atsushi Ooki , Tetsuya Takatsu
{"title":"Multi-month prediction of summertime hypoxia occurrence in the bottom of Funka Bay, Japan, with a focus on the wintertime surface heat flux","authors":"Chihiro Miki ,&nbsp;Hiroto Abe ,&nbsp;Hiroji Onishi ,&nbsp;Atsushi Ooki ,&nbsp;Tetsuya Takatsu","doi":"10.1016/j.jmarsys.2024.104035","DOIUrl":null,"url":null,"abstract":"<div><div>Hypoxic water (&lt; 2 mL of O<sub>2</sub> per L), which can cause mass mortality of demersal fishes, is reported to occur in the enclosed coastal area around the world. Funka Bay, a semi-enclosed and cone-shaped bay with a maximum depth of 107 m, located in the southern part of Hokkaido, Japan, also suffers summertime bottom hypoxic water. Long-term monitoring reveals that the occurrence is greatly variable year by year, yet the controlling factor is still unknown. The present study examined the interannual variability of summertime bottom dissolved oxygen (DO) with the focus on the wintertime heat loss of the water and subsequent convection overturning using year-round moored/ship-board DO observation for the period of 2012–2019. A common feature found in the 8 years was the continuous recovery of bottom DO in winter from the previous summer, which peaked February or March. The first half of the analysis period ceased the DO recovery until February, while one month extension of the DO recovery by March in the second half. The latter tended to show less hypoxia in the following summer as its peak is higher and its DO reduction phase starts later. Wintertime surface heat flux in February created the difference; more heat was lost in the second half because of warmer water temperature under the winter atmosphere. We were successful to predict summertime bottom DO with the accuracy of 0.26 mL/L considering the wintertime heat flux and stratification. This multi-month prediction will be of great help for future fishery activity in Funka Bay.</div></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"247 ","pages":"Article 104035"},"PeriodicalIF":2.7000,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Marine Systems","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0924796324000733","RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0

Abstract

Hypoxic water (< 2 mL of O2 per L), which can cause mass mortality of demersal fishes, is reported to occur in the enclosed coastal area around the world. Funka Bay, a semi-enclosed and cone-shaped bay with a maximum depth of 107 m, located in the southern part of Hokkaido, Japan, also suffers summertime bottom hypoxic water. Long-term monitoring reveals that the occurrence is greatly variable year by year, yet the controlling factor is still unknown. The present study examined the interannual variability of summertime bottom dissolved oxygen (DO) with the focus on the wintertime heat loss of the water and subsequent convection overturning using year-round moored/ship-board DO observation for the period of 2012–2019. A common feature found in the 8 years was the continuous recovery of bottom DO in winter from the previous summer, which peaked February or March. The first half of the analysis period ceased the DO recovery until February, while one month extension of the DO recovery by March in the second half. The latter tended to show less hypoxia in the following summer as its peak is higher and its DO reduction phase starts later. Wintertime surface heat flux in February created the difference; more heat was lost in the second half because of warmer water temperature under the winter atmosphere. We were successful to predict summertime bottom DO with the accuracy of 0.26 mL/L considering the wintertime heat flux and stratification. This multi-month prediction will be of great help for future fishery activity in Funka Bay.
查看原文
分享 分享
微信好友 朋友圈 QQ好友 复制链接
本刊更多论文
求助全文
约1分钟内获得全文 去求助
来源期刊
Journal of Marine Systems
Journal of Marine Systems 地学-地球科学综合
CiteScore
6.20
自引率
3.60%
发文量
81
审稿时长
6 months
期刊介绍: The Journal of Marine Systems provides a medium for interdisciplinary exchange between physical, chemical and biological oceanographers and marine geologists. The journal welcomes original research papers and review articles. Preference will be given to interdisciplinary approaches to marine systems.
期刊最新文献
30 years of sea surface temperature and salinity observations crossing the Southern Ocean near 140°E: Trends and rollercoaster variability Trend analysis of time series variations in the marine environments and size-fractionated chlorophyll a in the coastal areas of eastern Hokkaido, southwestern Okhotsk Sea Climate-driven warming, deoxygenation, and desertification in large marine ecosystems Global surface ocean calcite saturation (Ωcal) estimation using satellite and in-situ observations Editorial Board
×
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
现在去查看 取消
×
提示
确定
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
已复制链接
已复制链接
快去分享给好友吧!
我知道了
×
扫码分享
扫码分享
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 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 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1