Surface Ocean Enstrophy, Kinetic Energy Fluxes and Spectra from Satellite Altimetry
Enstrophy, kinetic energy (KE) fluxes and spectra are estimated in different parts of the mid-latitudinal oceans via altimetry data. To begin with, using geostrophic currents derived from sea-surface height anomaly data provided by AVISO, we confirm the presence of a strong inverse flux of surface K...
Gespeichert in:
Veröffentlicht in: | arXiv.org 2017-01 |
---|---|
Hauptverfasser: | , , , |
Format: | Artikel |
Sprache: | eng |
Schlagworte: | |
Online-Zugang: | Volltext |
Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
container_end_page | |
---|---|
container_issue | |
container_start_page | |
container_title | arXiv.org |
container_volume | |
creator | Khatri, Hemant Sukhatme, Jai Kumar, Abhishek Verma, Mahendra K |
description | Enstrophy, kinetic energy (KE) fluxes and spectra are estimated in different parts of the mid-latitudinal oceans via altimetry data. To begin with, using geostrophic currents derived from sea-surface height anomaly data provided by AVISO, we confirm the presence of a strong inverse flux of surface KE at scales larger than approximately 250 km. We then compute enstrophy fluxes to help develop a clearer picture of the underlying dynamics at smaller scales, i.e., 250 km to 100 km. Here, we observe a robust enstrophy cascading regime, wherein the enstrophy shows a large forward flux and the KE spectra follow an approximate \(k^{-3.5}\) power-law. Given the rotational character of the flow, not only is this large scale inverse KE and smaller scale forward enstrophy transfer scenario consistent with expectations from idealized studies of three-dimensional rapidly-rotating and strongly-stratified turbulence, it also agrees with detailed analyses of spectra and fluxes in the upper level midlatitude troposphere. Decomposing the currents into components with greater and less than 100 day variability (referred to as seasonal and eddy, respectively), we find that, in addition to the eddy-eddy contribution, the seasonal-eddy and seasonal-seasonal fluxes play a significant role in the inverse (forward) flux of KE (enstrophy) at scales larger (smaller) than about 250 km. Taken together, we suspect, it is quite possible that, from about 250 km to 100 km, the altimeter is capturing the relatively steep portion of a surface oceanic counterpart of the upper tropospheric Nastrom-Gage spectrum. |
doi_str_mv | 10.48550/arxiv.1701.07966 |
format | Article |
fullrecord | <record><control><sourceid>proquest_arxiv</sourceid><recordid>TN_cdi_arxiv_primary_1701_07966</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>2074722212</sourcerecordid><originalsourceid>FETCH-LOGICAL-a522-5f5f65c3a57fe7b9686b81049c1dc222c8b83b97a39a594c707643b17eaeac773</originalsourceid><addsrcrecordid>eNotj01Lw0AYhBdBsNT-AE8ueDV1P7K72WMprYqFHtJ7eLN9oyn5crOR5t8bW08DwzAzDyEPnC3jRCn2Av5c_iy5YXzJjNX6hsyElDxKYiHuyKLvT4wxoY1QSs5Img6-AId07xAaumn64Nvua3ymH2WDoXSThf5zpNtqOGNPoTnStEMXPNDCtzVNIWBVlQHpqgpljcGP9-S2gKrHxb_OyWG7Oazfot3-9X292kWghIhUoQqtnARlCjS51YnOE85i6_jRCSFckicytwakBWVjZ5jRscy5QUBwxsg5ebzWXoizzpc1-DH7I88u5FPi6ZrofPs9YB-yUzv4ZvqUCWZiM61wIX8BUKRbSQ</addsrcrecordid><sourcetype>Open Access Repository</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>2074722212</pqid></control><display><type>article</type><title>Surface Ocean Enstrophy, Kinetic Energy Fluxes and Spectra from Satellite Altimetry</title><source>arXiv.org</source><source>Free E- Journals</source><creator>Khatri, Hemant ; Sukhatme, Jai ; Kumar, Abhishek ; Verma, Mahendra K</creator><creatorcontrib>Khatri, Hemant ; Sukhatme, Jai ; Kumar, Abhishek ; Verma, Mahendra K</creatorcontrib><description>Enstrophy, kinetic energy (KE) fluxes and spectra are estimated in different parts of the mid-latitudinal oceans via altimetry data. To begin with, using geostrophic currents derived from sea-surface height anomaly data provided by AVISO, we confirm the presence of a strong inverse flux of surface KE at scales larger than approximately 250 km. We then compute enstrophy fluxes to help develop a clearer picture of the underlying dynamics at smaller scales, i.e., 250 km to 100 km. Here, we observe a robust enstrophy cascading regime, wherein the enstrophy shows a large forward flux and the KE spectra follow an approximate \(k^{-3.5}\) power-law. Given the rotational character of the flow, not only is this large scale inverse KE and smaller scale forward enstrophy transfer scenario consistent with expectations from idealized studies of three-dimensional rapidly-rotating and strongly-stratified turbulence, it also agrees with detailed analyses of spectra and fluxes in the upper level midlatitude troposphere. Decomposing the currents into components with greater and less than 100 day variability (referred to as seasonal and eddy, respectively), we find that, in addition to the eddy-eddy contribution, the seasonal-eddy and seasonal-seasonal fluxes play a significant role in the inverse (forward) flux of KE (enstrophy) at scales larger (smaller) than about 250 km. Taken together, we suspect, it is quite possible that, from about 250 km to 100 km, the altimeter is capturing the relatively steep portion of a surface oceanic counterpart of the upper tropospheric Nastrom-Gage spectrum.</description><identifier>EISSN: 2331-8422</identifier><identifier>DOI: 10.48550/arxiv.1701.07966</identifier><language>eng</language><publisher>Ithaca: Cornell University Library, arXiv.org</publisher><subject>Altimeters ; Computational fluid dynamics ; Fluid flow ; Fluxes ; Kinetic energy ; Ocean currents ; Oceans ; Physics - Atmospheric and Oceanic Physics ; Rotational spectra ; Satellite altimetry ; Sea currents ; Troposphere ; Vortices</subject><ispartof>arXiv.org, 2017-01</ispartof><rights>2017. This work is published under http://arxiv.org/licenses/nonexclusive-distrib/1.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><rights>http://arxiv.org/licenses/nonexclusive-distrib/1.0</rights><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>228,230,781,785,886,27930</link.rule.ids><backlink>$$Uhttps://doi.org/10.48550/arXiv.1701.07966$$DView paper in arXiv$$Hfree_for_read</backlink><backlink>$$Uhttps://doi.org/10.1029/2017JC013516$$DView published paper (Access to full text may be restricted)$$Hfree_for_read</backlink></links><search><creatorcontrib>Khatri, Hemant</creatorcontrib><creatorcontrib>Sukhatme, Jai</creatorcontrib><creatorcontrib>Kumar, Abhishek</creatorcontrib><creatorcontrib>Verma, Mahendra K</creatorcontrib><title>Surface Ocean Enstrophy, Kinetic Energy Fluxes and Spectra from Satellite Altimetry</title><title>arXiv.org</title><description>Enstrophy, kinetic energy (KE) fluxes and spectra are estimated in different parts of the mid-latitudinal oceans via altimetry data. To begin with, using geostrophic currents derived from sea-surface height anomaly data provided by AVISO, we confirm the presence of a strong inverse flux of surface KE at scales larger than approximately 250 km. We then compute enstrophy fluxes to help develop a clearer picture of the underlying dynamics at smaller scales, i.e., 250 km to 100 km. Here, we observe a robust enstrophy cascading regime, wherein the enstrophy shows a large forward flux and the KE spectra follow an approximate \(k^{-3.5}\) power-law. Given the rotational character of the flow, not only is this large scale inverse KE and smaller scale forward enstrophy transfer scenario consistent with expectations from idealized studies of three-dimensional rapidly-rotating and strongly-stratified turbulence, it also agrees with detailed analyses of spectra and fluxes in the upper level midlatitude troposphere. Decomposing the currents into components with greater and less than 100 day variability (referred to as seasonal and eddy, respectively), we find that, in addition to the eddy-eddy contribution, the seasonal-eddy and seasonal-seasonal fluxes play a significant role in the inverse (forward) flux of KE (enstrophy) at scales larger (smaller) than about 250 km. Taken together, we suspect, it is quite possible that, from about 250 km to 100 km, the altimeter is capturing the relatively steep portion of a surface oceanic counterpart of the upper tropospheric Nastrom-Gage spectrum.</description><subject>Altimeters</subject><subject>Computational fluid dynamics</subject><subject>Fluid flow</subject><subject>Fluxes</subject><subject>Kinetic energy</subject><subject>Ocean currents</subject><subject>Oceans</subject><subject>Physics - Atmospheric and Oceanic Physics</subject><subject>Rotational spectra</subject><subject>Satellite altimetry</subject><subject>Sea currents</subject><subject>Troposphere</subject><subject>Vortices</subject><issn>2331-8422</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GOX</sourceid><recordid>eNotj01Lw0AYhBdBsNT-AE8ueDV1P7K72WMprYqFHtJ7eLN9oyn5crOR5t8bW08DwzAzDyEPnC3jRCn2Av5c_iy5YXzJjNX6hsyElDxKYiHuyKLvT4wxoY1QSs5Img6-AId07xAaumn64Nvua3ymH2WDoXSThf5zpNtqOGNPoTnStEMXPNDCtzVNIWBVlQHpqgpljcGP9-S2gKrHxb_OyWG7Oazfot3-9X292kWghIhUoQqtnARlCjS51YnOE85i6_jRCSFckicytwakBWVjZ5jRscy5QUBwxsg5ebzWXoizzpc1-DH7I88u5FPi6ZrofPs9YB-yUzv4ZvqUCWZiM61wIX8BUKRbSQ</recordid><startdate>20170127</startdate><enddate>20170127</enddate><creator>Khatri, Hemant</creator><creator>Sukhatme, Jai</creator><creator>Kumar, Abhishek</creator><creator>Verma, Mahendra K</creator><general>Cornell University Library, arXiv.org</general><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>L6V</scope><scope>M7S</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope><scope>GOX</scope></search><sort><creationdate>20170127</creationdate><title>Surface Ocean Enstrophy, Kinetic Energy Fluxes and Spectra from Satellite Altimetry</title><author>Khatri, Hemant ; Sukhatme, Jai ; Kumar, Abhishek ; Verma, Mahendra K</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a522-5f5f65c3a57fe7b9686b81049c1dc222c8b83b97a39a594c707643b17eaeac773</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2017</creationdate><topic>Altimeters</topic><topic>Computational fluid dynamics</topic><topic>Fluid flow</topic><topic>Fluxes</topic><topic>Kinetic energy</topic><topic>Ocean currents</topic><topic>Oceans</topic><topic>Physics - Atmospheric and Oceanic Physics</topic><topic>Rotational spectra</topic><topic>Satellite altimetry</topic><topic>Sea currents</topic><topic>Troposphere</topic><topic>Vortices</topic><toplevel>online_resources</toplevel><creatorcontrib>Khatri, Hemant</creatorcontrib><creatorcontrib>Sukhatme, Jai</creatorcontrib><creatorcontrib>Kumar, Abhishek</creatorcontrib><creatorcontrib>Verma, Mahendra K</creatorcontrib><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>SciTech Premium Collection</collection><collection>ProQuest Engineering Collection</collection><collection>Engineering Database</collection><collection>Access via ProQuest (Open Access)</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><collection>Engineering Collection</collection><collection>arXiv.org</collection><jtitle>arXiv.org</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Khatri, Hemant</au><au>Sukhatme, Jai</au><au>Kumar, Abhishek</au><au>Verma, Mahendra K</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Surface Ocean Enstrophy, Kinetic Energy Fluxes and Spectra from Satellite Altimetry</atitle><jtitle>arXiv.org</jtitle><date>2017-01-27</date><risdate>2017</risdate><eissn>2331-8422</eissn><abstract>Enstrophy, kinetic energy (KE) fluxes and spectra are estimated in different parts of the mid-latitudinal oceans via altimetry data. To begin with, using geostrophic currents derived from sea-surface height anomaly data provided by AVISO, we confirm the presence of a strong inverse flux of surface KE at scales larger than approximately 250 km. We then compute enstrophy fluxes to help develop a clearer picture of the underlying dynamics at smaller scales, i.e., 250 km to 100 km. Here, we observe a robust enstrophy cascading regime, wherein the enstrophy shows a large forward flux and the KE spectra follow an approximate \(k^{-3.5}\) power-law. Given the rotational character of the flow, not only is this large scale inverse KE and smaller scale forward enstrophy transfer scenario consistent with expectations from idealized studies of three-dimensional rapidly-rotating and strongly-stratified turbulence, it also agrees with detailed analyses of spectra and fluxes in the upper level midlatitude troposphere. Decomposing the currents into components with greater and less than 100 day variability (referred to as seasonal and eddy, respectively), we find that, in addition to the eddy-eddy contribution, the seasonal-eddy and seasonal-seasonal fluxes play a significant role in the inverse (forward) flux of KE (enstrophy) at scales larger (smaller) than about 250 km. Taken together, we suspect, it is quite possible that, from about 250 km to 100 km, the altimeter is capturing the relatively steep portion of a surface oceanic counterpart of the upper tropospheric Nastrom-Gage spectrum.</abstract><cop>Ithaca</cop><pub>Cornell University Library, arXiv.org</pub><doi>10.48550/arxiv.1701.07966</doi><oa>free_for_read</oa></addata></record> |
fulltext | fulltext |
identifier | EISSN: 2331-8422 |
ispartof | arXiv.org, 2017-01 |
issn | 2331-8422 |
language | eng |
recordid | cdi_arxiv_primary_1701_07966 |
source | arXiv.org; Free E- Journals |
subjects | Altimeters Computational fluid dynamics Fluid flow Fluxes Kinetic energy Ocean currents Oceans Physics - Atmospheric and Oceanic Physics Rotational spectra Satellite altimetry Sea currents Troposphere Vortices |
title | Surface Ocean Enstrophy, Kinetic Energy Fluxes and Spectra from Satellite Altimetry |
url | https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2024-12-14T01%3A22%3A35IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-proquest_arxiv&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Surface%20Ocean%20Enstrophy,%20Kinetic%20Energy%20Fluxes%20and%20Spectra%20from%20Satellite%20Altimetry&rft.jtitle=arXiv.org&rft.au=Khatri,%20Hemant&rft.date=2017-01-27&rft.eissn=2331-8422&rft_id=info:doi/10.48550/arxiv.1701.07966&rft_dat=%3Cproquest_arxiv%3E2074722212%3C/proquest_arxiv%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_pqid=2074722212&rft_id=info:pmid/&rfr_iscdi=true |