Carlos Conejero, Lionel Renault, Fabien Desbiolles, J. McWilliams, Hervé Giordani
{"title":"近地面大气对中尺度和次中尺度洋流和热反馈的响应","authors":"Carlos Conejero, Lionel Renault, Fabien Desbiolles, J. McWilliams, Hervé Giordani","doi":"10.1175/jpo-d-23-0211.1","DOIUrl":null,"url":null,"abstract":"\nCurrent Feedback (CFB) and Thermal Feedback (TFB) have been shown to strongly influence both atmospheric and oceanic dynamics at the oceanic mesoscale (10-250 km). At smaller scales, oceanic submesoscale currents (SMCs, 0.1-10 km) have a major influence on the ocean’s energy budget, variability, and ecosystems. However, submesoscale air-sea interactions are not well understood due to observational and modeling limitations related to their scales. Here, we use realistic submesoscale-permitting coupled oceanic and atmospheric model to quantify the spatiotemporal variability of TFB and CFB coupling in the Northwest Tropical Atlantic. While CFB still acts as a submesoscale eddy killer by inducing an energy sink from the SMCs to the atmosphere, it appears to be more efficient at the submesoscale by approximately 30% than at the mesoscale. Submesoscale CFB affects the surface stress, however, the finite timescale of SMCs for adjusting the atmospheric boundary layer results in a diminished low-level wind response, weakening partial ocean re-energization by about 70%. Unlike at the mesoscale, submesoscale CFB induces stress/wind convergence/divergence, influencing the atmospheric boundary layer through vertical motions. The linear relationship between the surface stress (wind) derivative fields and sea surface temperature gradients, widespread at the mesoscale, decreases by approximately 35% ±7% (77% ±10%) at the submesoscale. Additionally, submesoscale TFB induces turbulent heat fluxes comparable to those at the mesoscale. Seasonal variability in meso- and submesoscale CFB and TFB coupling is mostly related to background wind speed. Finally, disentangling submesoscale CFB and TFB is challenging because they can reinforce or counteract each other.","PeriodicalId":56115,"journal":{"name":"Journal of Physical Oceanography","volume":null,"pages":null},"PeriodicalIF":2.8000,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Near-Surface Atmospheric Response to Meso- and Submesoscale Current and Thermal Feedbacks\",\"authors\":\"Carlos Conejero, Lionel Renault, Fabien Desbiolles, J. McWilliams, Hervé Giordani\",\"doi\":\"10.1175/jpo-d-23-0211.1\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"\\nCurrent Feedback (CFB) and Thermal Feedback (TFB) have been shown to strongly influence both atmospheric and oceanic dynamics at the oceanic mesoscale (10-250 km). At smaller scales, oceanic submesoscale currents (SMCs, 0.1-10 km) have a major influence on the ocean’s energy budget, variability, and ecosystems. However, submesoscale air-sea interactions are not well understood due to observational and modeling limitations related to their scales. Here, we use realistic submesoscale-permitting coupled oceanic and atmospheric model to quantify the spatiotemporal variability of TFB and CFB coupling in the Northwest Tropical Atlantic. While CFB still acts as a submesoscale eddy killer by inducing an energy sink from the SMCs to the atmosphere, it appears to be more efficient at the submesoscale by approximately 30% than at the mesoscale. Submesoscale CFB affects the surface stress, however, the finite timescale of SMCs for adjusting the atmospheric boundary layer results in a diminished low-level wind response, weakening partial ocean re-energization by about 70%. Unlike at the mesoscale, submesoscale CFB induces stress/wind convergence/divergence, influencing the atmospheric boundary layer through vertical motions. The linear relationship between the surface stress (wind) derivative fields and sea surface temperature gradients, widespread at the mesoscale, decreases by approximately 35% ±7% (77% ±10%) at the submesoscale. Additionally, submesoscale TFB induces turbulent heat fluxes comparable to those at the mesoscale. Seasonal variability in meso- and submesoscale CFB and TFB coupling is mostly related to background wind speed. Finally, disentangling submesoscale CFB and TFB is challenging because they can reinforce or counteract each other.\",\"PeriodicalId\":56115,\"journal\":{\"name\":\"Journal of Physical Oceanography\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":2.8000,\"publicationDate\":\"2024-01-12\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Physical Oceanography\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://doi.org/10.1175/jpo-d-23-0211.1\",\"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 Physical Oceanography","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1175/jpo-d-23-0211.1","RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"OCEANOGRAPHY","Score":null,"Total":0}
Near-Surface Atmospheric Response to Meso- and Submesoscale Current and Thermal Feedbacks
Current Feedback (CFB) and Thermal Feedback (TFB) have been shown to strongly influence both atmospheric and oceanic dynamics at the oceanic mesoscale (10-250 km). At smaller scales, oceanic submesoscale currents (SMCs, 0.1-10 km) have a major influence on the ocean’s energy budget, variability, and ecosystems. However, submesoscale air-sea interactions are not well understood due to observational and modeling limitations related to their scales. Here, we use realistic submesoscale-permitting coupled oceanic and atmospheric model to quantify the spatiotemporal variability of TFB and CFB coupling in the Northwest Tropical Atlantic. While CFB still acts as a submesoscale eddy killer by inducing an energy sink from the SMCs to the atmosphere, it appears to be more efficient at the submesoscale by approximately 30% than at the mesoscale. Submesoscale CFB affects the surface stress, however, the finite timescale of SMCs for adjusting the atmospheric boundary layer results in a diminished low-level wind response, weakening partial ocean re-energization by about 70%. Unlike at the mesoscale, submesoscale CFB induces stress/wind convergence/divergence, influencing the atmospheric boundary layer through vertical motions. The linear relationship between the surface stress (wind) derivative fields and sea surface temperature gradients, widespread at the mesoscale, decreases by approximately 35% ±7% (77% ±10%) at the submesoscale. Additionally, submesoscale TFB induces turbulent heat fluxes comparable to those at the mesoscale. Seasonal variability in meso- and submesoscale CFB and TFB coupling is mostly related to background wind speed. Finally, disentangling submesoscale CFB and TFB is challenging because they can reinforce or counteract each other.
期刊介绍:
The Journal of Physical Oceanography (JPO) (ISSN: 0022-3670; eISSN: 1520-0485) publishes research related to the physics of the ocean and to processes operating at its boundaries. Observational, theoretical, and modeling studies are all welcome, especially those that focus on elucidating specific physical processes. Papers that investigate interactions with other components of the Earth system (e.g., ocean–atmosphere, physical–biological, and physical–chemical interactions) as well as studies of other fluid systems (e.g., lakes and laboratory tanks) are also invited, as long as their focus is on understanding the ocean or its role in the Earth system.