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Simulated heat flux and sea ice production at coastal polynyas in the southwestern Weddell Sea

Identifieur interne : 001A89 ( Istex/Corpus ); précédent : 001A88; suivant : 001A90

Simulated heat flux and sea ice production at coastal polynyas in the southwestern Weddell Sea

Auteurs : V. Haid ; R. Timmermann

Source :

RBID : ISTEX:89CDC193E69A3780086C80C2EB65E9B541F27F3C

Abstract

Coastal polynyas are areas in an ice‐covered ocean where the ice cover is exported, mostly by off‐shore winds. The resulting reduction of sea ice enables an enhanced ocean‐atmosphere heat transfer. Once the water temperatures are at the freezing point, further heat loss induces sea ice production. The heat exchange and ice production in coastal polynyas in the southwestern Weddell Sea is addressed using the Finite‐Element Sea‐ice Ocean Model, a primitive‐equation, hydrostatic ocean circulation model coupled with a dynamic‐thermodynamic sea‐ice model, which allows to quantify the amount of heat associated with cooling of the water column. Three important polynya regions are identified: at Brunt Ice Shelf, at Ronne Ice Shelf and along the southern part of the Antarctic Peninsula. Multiyear winter means (May–September 1990–2009) give an upward heat flux to the atmosphere of 311 W/m2 in the Brunt polynyas, 511 W/m2 in Ronne Polynya and 364 W/m2 in the Antarctic Peninsula polynyas, whereof 57 W/m2, 49 W/m2 and 48 W/m2, respectively, are supplied as oceanic heat flux from deeper layers. The mean winter sea ice production is 7.2 cm/d in the Brunt polynyas corresponding to an ice volume of 1.3 ×1010 m3/winter, 13.2 cm/d at Ronne polynya (4.4 ×1010 m3/winter), and 9.2 cm/d in the Antarctic Peninsula polynyas (2.1 ×1010 m3/winter). The heat flux to the atmosphere inside polynyas is 7 to 9 times higher than the heat flux in the adjacent area; polynya ice production per unit area exceeds adjacent values by a factor of 9 to 14.

Url:
DOI: 10.1002/jgrc.20133

Links to Exploration step

ISTEX:89CDC193E69A3780086C80C2EB65E9B541F27F3C

Le document en format XML

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<p>Coastal polynyas are areas in an ice‐covered ocean where the ice cover is exported, mostly by off‐shore winds. The resulting reduction of sea ice enables an enhanced ocean‐atmosphere heat transfer. Once the water temperatures are at the freezing point, further heat loss induces sea ice production. The heat exchange and ice production in coastal polynyas in the southwestern Weddell Sea is addressed using the Finite‐Element Sea‐ice Ocean Model, a primitive‐equation, hydrostatic ocean circulation model coupled with a dynamic‐thermodynamic sea‐ice model, which allows to quantify the amount of heat associated with cooling of the water column. Three important polynya regions are identified: at Brunt Ice Shelf, at Ronne Ice Shelf and along the southern part of the Antarctic Peninsula. Multiyear winter means (May–September 1990–2009) give an upward heat flux to the atmosphere of 311 W/m2 in the Brunt polynyas, 511 W/m2 in Ronne Polynya and 364 W/m2 in the Antarctic Peninsula polynyas, whereof 57 W/m2, 49 W/m2 and 48 W/m2, respectively, are supplied as oceanic heat flux from deeper layers. The mean winter sea ice production is 7.2 cm/d in the Brunt polynyas corresponding to an ice volume of 1.3 ×1010 m3/winter, 13.2 cm/d at Ronne polynya (4.4 ×1010 m3/winter), and 9.2 cm/d in the Antarctic Peninsula polynyas (2.1 ×1010 m3/winter). The heat flux to the atmosphere inside polynyas is 7 to 9 times higher than the heat flux in the adjacent area; polynya ice production per unit area exceeds adjacent values by a factor of 9 to 14.</p>
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<author>
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, and
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<familyName>Timmermann</familyName>
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(
<pubYear year="2013">2013</pubYear>
),
<articleTitle>Simulated heat flux and sea ice production at coastal polynyas in the southwestern Weddell Sea</articleTitle>
,
<journalTitle>J. Geophys. Res. Oceans</journalTitle>
,
<vol>118</vol>
,
<pageFirst>2640</pageFirst>
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<title type="main">Simulated heat flux and sea ice production at coastal polynyas in the southwestern Weddell Sea</title>
<title type="shortAuthors">HAID AND TIMMERMANN</title>
<title type="short">HEAT FLUX AND SEA ICE PRODUCTION</title>
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<orgName>Alfred Wegener Institute</orgName>
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<city>Bremerhaven</city>
<country>Germany</country>
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<keyword xml:id="jgrc20133-kwd-0001">coastal polynya</keyword>
<keyword xml:id="jgrc20133-kwd-0002">Weddell Sea</keyword>
<keyword xml:id="jgrc20133-kwd-0003">heat flux</keyword>
<keyword xml:id="jgrc20133-kwd-0004">sea ice</keyword>
<keyword xml:id="jgrc20133-kwd-0005">modelling</keyword>
<keyword xml:id="jgrc20133-kwd-0006">oceanic heat flux</keyword>
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<p xml:id="jgrc20133-para-0001" label="1">Coastal polynyas are areas in an ice‐covered ocean where the ice cover is exported, mostly by off‐shore winds. The resulting reduction of sea ice enables an enhanced ocean‐atmosphere heat transfer. Once the water temperatures are at the freezing point, further heat loss induces sea ice production. The heat exchange and ice production in coastal polynyas in the southwestern Weddell Sea is addressed using the Finite‐Element Sea‐ice Ocean Model, a primitive‐equation, hydrostatic ocean circulation model coupled with a dynamic‐thermodynamic sea‐ice model, which allows to quantify the amount of heat associated with cooling of the water column. Three important polynya regions are identified: at Brunt Ice Shelf, at Ronne Ice Shelf and along the southern part of the Antarctic Peninsula. Multiyear winter means (May–September 1990–2009) give an upward heat flux to the atmosphere of 311 W/m
<sup>2</sup>
in the Brunt polynyas, 511 W/m
<sup>2</sup>
in Ronne Polynya and 364 W/m
<sup>2</sup>
in the Antarctic Peninsula polynyas, whereof 57 W/m
<sup>2</sup>
, 49 W/m
<sup>2</sup>
and 48 W/m
<sup>2</sup>
, respectively, are supplied as oceanic heat flux from deeper layers. The mean winter sea ice production is 7.2 cm/d in the Brunt polynyas corresponding to an ice volume of 1.3 ×10
<sup>10</sup>
 m
<sup>3</sup>
/winter, 13.2 cm/d at Ronne polynya (4.4 ×10
<sup>10</sup>
 m
<sup>3</sup>
/winter), and 9.2 cm/d in the Antarctic Peninsula polynyas (2.1 ×10
<sup>10</sup>
 m
<sup>3</sup>
/winter). The heat flux to the atmosphere inside polynyas is 7 to 9 times higher than the heat flux in the adjacent area; polynya ice production per unit area exceeds adjacent values by a factor of 9 to 14.</p>
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<listItem xml:id="jgrc20133-li-0001">Wintertime southwestern Weddell Sea coastal polynya area and activity</listItem>
<listItem xml:id="jgrc20133-li-0002">Simulation of wintertime coastal polynya heat flux and ice production</listItem>
<listItem xml:id="jgrc20133-li-0003">Contribution of the oceanic heat flux at coastal polynyas</listItem>
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<abstract>Coastal polynyas are areas in an ice‐covered ocean where the ice cover is exported, mostly by off‐shore winds. The resulting reduction of sea ice enables an enhanced ocean‐atmosphere heat transfer. Once the water temperatures are at the freezing point, further heat loss induces sea ice production. The heat exchange and ice production in coastal polynyas in the southwestern Weddell Sea is addressed using the Finite‐Element Sea‐ice Ocean Model, a primitive‐equation, hydrostatic ocean circulation model coupled with a dynamic‐thermodynamic sea‐ice model, which allows to quantify the amount of heat associated with cooling of the water column. Three important polynya regions are identified: at Brunt Ice Shelf, at Ronne Ice Shelf and along the southern part of the Antarctic Peninsula. Multiyear winter means (May–September 1990–2009) give an upward heat flux to the atmosphere of 311 W/m2 in the Brunt polynyas, 511 W/m2 in Ronne Polynya and 364 W/m2 in the Antarctic Peninsula polynyas, whereof 57 W/m2, 49 W/m2 and 48 W/m2, respectively, are supplied as oceanic heat flux from deeper layers. The mean winter sea ice production is 7.2 cm/d in the Brunt polynyas corresponding to an ice volume of 1.3 ×1010 m3/winter, 13.2 cm/d at Ronne polynya (4.4 ×1010 m3/winter), and 9.2 cm/d in the Antarctic Peninsula polynyas (2.1 ×1010 m3/winter). The heat flux to the atmosphere inside polynyas is 7 to 9 times higher than the heat flux in the adjacent area; polynya ice production per unit area exceeds adjacent values by a factor of 9 to 14.</abstract>
<abstract type="short">Wintertime southwestern Weddell Sea coastal polynya area and activitySimulation of wintertime coastal polynya heat flux and ice productionContribution of the oceanic heat flux at coastal polynyas</abstract>
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<topic authorityURI="http://psi.agu.org/taxonomy5/0766">Thermodynamics</topic>
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<topic authorityURI="http://psi.agu.org/taxonomy5/0754">Leads</topic>
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<topic authorityURI="http://psi.agu.org/taxonomy5/4316">Physical modeling</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/4500">OCEANOGRAPHY: PHYSICAL</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/4540">Ice mechanics and air/sea/ice exchange processes</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/8400">VOLCANOLOGY</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/8411">Thermodynamics</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/9300">GEOGRAPHIC LOCATION</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/9310">Antarctica</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/9315">Arctic region</topic>
</subject>
<subject>
<genre>article-category</genre>
<topic>Regular Article</topic>
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<identifier type="ISSN">2169-9275</identifier>
<identifier type="eISSN">2169-9291</identifier>
<identifier type="DOI">10.1002/(ISSN)2169-9291</identifier>
<identifier type="PublisherID">JGRC</identifier>
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<date>2013</date>
<detail type="volume">
<caption>vol.</caption>
<number>118</number>
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<caption>no.</caption>
<number>5</number>
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<start>2640</start>
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