S-2DV: A New Reduced Model Generating Submesoscale-Like Flows

IF 4.4 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES Journal of Advances in Modeling Earth Systems Pub Date : 2024-11-27 DOI:10.1029/2024MS004438
Krithin Gowthaman, Jim Thomas
{"title":"S-2DV: A New Reduced Model Generating Submesoscale-Like Flows","authors":"Krithin Gowthaman,&nbsp;Jim Thomas","doi":"10.1029/2024MS004438","DOIUrl":null,"url":null,"abstract":"<p>Oceanic mesoscale flows are characterized by an inverse kinetic energy cascade and the subsequent formation of large coherent vortices, and these flow features are captured well by the quasi-geostrophic (QG) model. Oceanic submesoscale flow dynamics are however significantly different from those of mesoscales. The increase in unbalanced energy levels and the Rossby number at submesoscales results in cyclone-anticyclone asymmetry in vorticity structures, forward kinetic energy cascades, and enhanced small-scale dissipation. In this paper, we develop a reduced single-equation model that can generate submesoscale-like flows in two dimensions. We start from the two-dimensional barotropic QG equation and add an external random vorticity field, to mimic the effect of unbalanced flow components. Thereafter, we add a vorticity-squared term, to generate asymmetry in the vorticity structures. By varying the strength of these two terms, we observe that the model can generate submesoscale-like flows that compare qualitatively well with realistic flows generated by complex ocean models. The reduced model is seen to be capable of generating flows that are intermittent in nature, are characterized by a forward energy flux, and are composed of small-scale flow structures along with enhanced energy dissipation. We further demonstrate the practical utility of the model by applying it to a passive tracer dispersion and a plankton patchiness problem, these being applications that require submesoscale-like flows. Our investigation points out that the new model could serve as a convenient platform for various applications that require submesoscale-like flows, such as testing and developing different kinds of parameterizations.</p>","PeriodicalId":14881,"journal":{"name":"Journal of Advances in Modeling Earth Systems","volume":"16 12","pages":""},"PeriodicalIF":4.4000,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024MS004438","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Advances in Modeling Earth Systems","FirstCategoryId":"89","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1029/2024MS004438","RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"METEOROLOGY & ATMOSPHERIC SCIENCES","Score":null,"Total":0}
引用次数: 0

Abstract

Oceanic mesoscale flows are characterized by an inverse kinetic energy cascade and the subsequent formation of large coherent vortices, and these flow features are captured well by the quasi-geostrophic (QG) model. Oceanic submesoscale flow dynamics are however significantly different from those of mesoscales. The increase in unbalanced energy levels and the Rossby number at submesoscales results in cyclone-anticyclone asymmetry in vorticity structures, forward kinetic energy cascades, and enhanced small-scale dissipation. In this paper, we develop a reduced single-equation model that can generate submesoscale-like flows in two dimensions. We start from the two-dimensional barotropic QG equation and add an external random vorticity field, to mimic the effect of unbalanced flow components. Thereafter, we add a vorticity-squared term, to generate asymmetry in the vorticity structures. By varying the strength of these two terms, we observe that the model can generate submesoscale-like flows that compare qualitatively well with realistic flows generated by complex ocean models. The reduced model is seen to be capable of generating flows that are intermittent in nature, are characterized by a forward energy flux, and are composed of small-scale flow structures along with enhanced energy dissipation. We further demonstrate the practical utility of the model by applying it to a passive tracer dispersion and a plankton patchiness problem, these being applications that require submesoscale-like flows. Our investigation points out that the new model could serve as a convenient platform for various applications that require submesoscale-like flows, such as testing and developing different kinds of parameterizations.

Abstract Image

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
S-2DV:生成类似于亚目尺度流动的新还原模型
海洋中尺度流动的特点是反向动能级联和随后形成的大型相干涡旋,准地转营养(QG)模式很好地捕捉到了这些流动特征。然而,海洋次中尺度流动动力学与中尺度流动动力学有很大不同。次中尺度不平衡能级和罗斯比数的增加导致涡度结构中气旋-反气旋的不对称、前向动能级联以及小尺度耗散的增强。在本文中,我们建立了一个简化的单方程模型,可以在二维范围内产生类似于亚旋涡尺度的流动。我们从二维气压 QG 方程出发,添加了一个外部随机涡度场,以模拟不平衡流动成分的影响。之后,我们添加了一个涡度平方项,以产生涡度结构的不对称性。通过改变这两个项的强度,我们观察到该模型可以产生类似于亚中尺度的流动,与复杂海洋模型产生的实际流动相比,其质量非常好。缩小后的模型能够生成间歇性流动,具有前向能量通量的特征,由小尺度流动结构和增强的能量耗散组成。我们还将该模型应用于被动示踪剂扩散和浮游生物斑块问题,进一步证明了该模型的实用性。我们的研究结果表明,新模型可以作为一个便捷的平台,用于需要类似于亚目尺度流的各种应用,如测试和开发不同类型的参数。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 去求助
来源期刊
Journal of Advances in Modeling Earth Systems
Journal of Advances in Modeling Earth Systems METEOROLOGY & ATMOSPHERIC SCIENCES-
CiteScore
11.40
自引率
11.80%
发文量
241
审稿时长
>12 weeks
期刊介绍: The Journal of Advances in Modeling Earth Systems (JAMES) is committed to advancing the science of Earth systems modeling by offering high-quality scientific research through online availability and open access licensing. JAMES invites authors and readers from the international Earth systems modeling community. Open access. Articles are available free of charge for everyone with Internet access to view and download. Formal peer review. Supplemental material, such as code samples, images, and visualizations, is published at no additional charge. No additional charge for color figures. Modest page charges to cover production costs. Articles published in high-quality full text PDF, HTML, and XML. Internal and external reference linking, DOI registration, and forward linking via CrossRef.
期刊最新文献
Bridging the Gap Between Global Weather Prediction and Global Storm-Resolving Simulation: Introducing the GFDL 6.5-km SHiELD The Averaged Hydrostatic Boussinesq Ocean Equations in Generalized Vertical Coordinates Improving Urban Climate Adaptation Modeling in the Community Earth System Model (CESM) Through Transient Urban Surface Albedo Representation Physical Drivers and Biogeochemical Effects of the Projected Decline of the Shelfbreak Jet in the Northwest North Atlantic Ocean Climatological Adaptive Bias Correction of Climate Models
×
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