Impact of ice temperature on microwave emissivity of thin newly formed sea ice
Identifieur interne : 000821 ( Istex/Corpus ); précédent : 000820; suivant : 000822Impact of ice temperature on microwave emissivity of thin newly formed sea ice
Auteurs : Byong Jun Hwang ; Jens K. Ehn ; David G. BarberSource :
- Journal of Geophysical Research: Oceans [ 0148-0227 ] ; 2008-02.
Abstract
This study examines the impact of ice temperature on microwave emissivity over thin, newly formed sea ice at 6, 19, and 37 GHz during October 2003 in the southern Beaufort Sea, where the physical properties of newly formed sea ice were coincidently measured with microwave emissions. Six ice stations with distinct properties were selected and divided according to ice surface temperature into warm (above –3°C) or cold (below –3°C) stations. The warm stations had a lower emissivity at the vertical polarization by 0.1 than the cold stations and a corresponding difference in brine volume and dielectric properties. Significant correlations were observed between brine volume and ice emissivity (R2 = 0.8, p value < 0.05). A sensitivity study showed that decreasing ice temperatures from −2.1° to −5.0°C explained the observed difference of 0.1 in ice emissivity between warm and cold stations. The results suggest that the temperature of thin bare ice could be the critical factor in determining ice emissivity near the melting point (about −2°C). Furthermore, a slight decrease in ice temperature (i.e., from −2° to −5°C) significantly reduces the brine volume, thus resulting in high ice emissivity. Finally, we demonstrate the potential of newly formed ice to cause errors in estimating sea ice concentrations using Advanced Microwave Scanning Radiometer–E data.
Url:
DOI: 10.1029/2006JC003930
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Six ice stations with distinct properties were selected and divided according to ice surface temperature into warm (above –3°C) or cold (below –3°C) stations. The warm stations had a lower emissivity at the vertical polarization by 0.1 than the cold stations and a corresponding difference in brine volume and dielectric properties. Significant correlations were observed between brine volume and ice emissivity (R2 = 0.8, p value < 0.05). A sensitivity study showed that decreasing ice temperatures from −2.1° to −5.0°C explained the observed difference of 0.1 in ice emissivity between warm and cold stations. The results suggest that the temperature of thin bare ice could be the critical factor in determining ice emissivity near the melting point (about −2°C). Furthermore, a slight decrease in ice temperature (i.e., from −2° to −5°C) significantly reduces the brine volume, thus resulting in high ice emissivity. Finally, we demonstrate the potential of newly formed ice to cause errors in estimating sea ice concentrations using Advanced Microwave Scanning Radiometer–E data.</div></front></TEI><istex><corpusName>wiley</corpusName><author><json:item><name>Byong Jun Hwang</name><affiliations><json:string>Centre for Earth Observation Science, University of Manitoba, Winnipeg, Manitoba, Canada</json:string><json:string>E-mail: umhwangb@cc.umanitoba.ca</json:string></affiliations></json:item><json:item><name>Jens K. Ehn</name><affiliations><json:string>Centre for Earth Observation Science, University of Manitoba, Winnipeg, Manitoba, Canada</json:string></affiliations></json:item><json:item><name>David G. 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Six ice stations with distinct properties were selected and divided according to ice surface temperature into warm (above –3°C) or cold (below –3°C) stations. The warm stations had a lower emissivity at the vertical polarization by 0.1 than the cold stations and a corresponding difference in brine volume and dielectric properties. Significant correlations were observed between brine volume and ice emissivity (R2 = 0.8, p value < 0.05). A sensitivity study showed that decreasing ice temperatures from −2.1° to −5.0°C explained the observed difference of 0.1 in ice emissivity between warm and cold stations. The results suggest that the temperature of thin bare ice could be the critical factor in determining ice emissivity near the melting point (about −2°C). Furthermore, a slight decrease in ice temperature (i.e., from −2° to −5°C) significantly reduces the brine volume, thus resulting in high ice emissivity. Finally, we demonstrate the potential of newly formed ice to cause errors in estimating sea ice concentrations using Advanced Microwave Scanning Radiometer–E data.</p></abstract><textClass><keywords scheme="keyword"><list><head>keywords</head><item><term>ice temperature</term></item><item><term>ice concentration</term></item><item><term>microwave emissivity</term></item><item><term>thin bare ice</term></item><item><term>fall freeze‐up</term></item><item><term>AMSR‐E</term></item></list></keywords></textClass><textClass><keywords scheme="Journal Subject"><list><head>index-terms</head><item><term>CRYOSPHERE</term></item><item><term>Remote sensing</term></item><item><term>Instruments and techniques</term></item><item><term>Thermodynamics</term></item><item><term>GEOCHEMISTRY</term></item><item><term>Thermodynamics</term></item><item><term>MINERALOGY AND PETROLOGY</term></item><item><term>Thermodynamics</term></item><item><term>VOLCANOLOGY</term></item><item><term>Thermodynamics</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="2006-08-01">Received</change><change when="2007-08-17">Registration</change><change when="2008-02">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api-v5.istex.fr/document/857DA4BB640753A5877D5CA5448B6BC0D5279843/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Wiley, elements deleted: body"><istex:xmlDeclaration>version="1.0" encoding="UTF-8" standalone="yes"</istex:xmlDeclaration><istex:document><component type="serialArticle" version="2.0" xml:lang="en" xml:id="jgrc10524"><header><publicationMeta level="product"><doi>10.1002/(ISSN)2156-2202c</doi><issn type="print">0148-0227</issn><issn type="electronic">2156-2202</issn><idGroup><id type="product" value="JGRC"></id><id type="coden" value="JGREA2"></id></idGroup><titleGroup><title type="main" xml:lang="en" sort="JOURNAL OF GEOPHYSICAL RESEARCH: OCEANS">Journal of Geophysical Research: Oceans</title><title type="short">J. 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J.</givenNames></author>, <author><givenNames>J. K.</givenNames> <familyName>Ehn</familyName></author>, and <author><givenNames>D. G.</givenNames> <familyName>Barber</familyName></author> (<pubYear year="2008">2008</pubYear>), <articleTitle>Impact of ice temperature on microwave emissivity of thin newly formed sea ice</articleTitle>, <journalTitle>J. Geophys. 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Six ice stations with distinct properties were selected and divided according to ice surface temperature into warm (above –3°C) or cold (below –3°C) stations. The warm stations had a lower emissivity at the vertical polarization by 0.1 than the cold stations and a corresponding difference in brine volume and dielectric properties. Significant correlations were observed between brine volume and ice emissivity (<i>R</i><sup>2</sup> = 0.8, <i>p</i> value < 0.05). A sensitivity study showed that decreasing ice temperatures from −2.1° to −5.0°C explained the observed difference of 0.1 in ice emissivity between warm and cold stations. The results suggest that the temperature of thin bare ice could be the critical factor in determining ice emissivity near the melting point (about −2°C). Furthermore, a slight decrease in ice temperature (i.e., from −2° to −5°C) significantly reduces the brine volume, thus resulting in high ice emissivity. Finally, we demonstrate the potential of newly formed ice to cause errors in estimating sea ice concentrations using Advanced Microwave Scanning Radiometer–E data.</p></abstract></abstractGroup></contentMeta></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Impact of ice temperature on microwave emissivity of thin newly formed sea ice</title></titleInfo><titleInfo type="abbreviated" lang="en"><title>IMPACT OF ICE TEMPERATURE ON EMISSIVITY</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>Impact of ice temperature on microwave emissivity of thin newly formed sea ice</title></titleInfo><name type="personal"><namePart type="given">Byong Jun</namePart><namePart type="family">Hwang</namePart><affiliation>Centre for Earth Observation Science, University of Manitoba, Winnipeg, Manitoba, Canada</affiliation><affiliation>E-mail: umhwangb@cc.umanitoba.ca</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Jens K.</namePart><namePart type="family">Ehn</namePart><affiliation>Centre for Earth Observation Science, University of Manitoba, Winnipeg, Manitoba, Canada</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">David G.</namePart><namePart type="family">Barber</namePart><affiliation>Centre for Earth Observation Science, University of Manitoba, Winnipeg, Manitoba, Canada</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="article" displayLabel="article"></genre><originInfo><publisher>Blackwell Publishing Ltd</publisher><dateIssued encoding="w3cdtf">2008-02</dateIssued><dateCaptured encoding="w3cdtf">2006-08-01</dateCaptured><dateValid encoding="w3cdtf">2007-08-17</dateValid><edition>Hwang, B. J., J. K. Ehn, and D. G. Barber (2008), Impact of ice temperature on microwave emissivity of thin newly formed sea ice, J. Geophys. Res., 113, C02021, doi:10.1029/2006JC003930.</edition><copyrightDate encoding="w3cdtf">2008</copyrightDate></originInfo><language><languageTerm type="code" authority="rfc3066">en</languageTerm><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType><extent unit="figures">9</extent><extent unit="tables">2</extent></physicalDescription><abstract>This study examines the impact of ice temperature on microwave emissivity over thin, newly formed sea ice at 6, 19, and 37 GHz during October 2003 in the southern Beaufort Sea, where the physical properties of newly formed sea ice were coincidently measured with microwave emissions. Six ice stations with distinct properties were selected and divided according to ice surface temperature into warm (above –3°C) or cold (below –3°C) stations. The warm stations had a lower emissivity at the vertical polarization by 0.1 than the cold stations and a corresponding difference in brine volume and dielectric properties. Significant correlations were observed between brine volume and ice emissivity (R2 = 0.8, p value < 0.05). A sensitivity study showed that decreasing ice temperatures from −2.1° to −5.0°C explained the observed difference of 0.1 in ice emissivity between warm and cold stations. The results suggest that the temperature of thin bare ice could be the critical factor in determining ice emissivity near the melting point (about −2°C). Furthermore, a slight decrease in ice temperature (i.e., from −2° to −5°C) significantly reduces the brine volume, thus resulting in high ice emissivity. Finally, we demonstrate the potential of newly formed ice to cause errors in estimating sea ice concentrations using Advanced Microwave Scanning Radiometer–E data.</abstract><note type="additional physical form">Tab‐delimited Table 1.Tab‐delimited Table 2.</note><subject><genre>keywords</genre><topic>ice temperature</topic><topic>ice concentration</topic><topic>microwave emissivity</topic><topic>thin bare ice</topic><topic>fall freeze‐up</topic><topic>AMSR‐E</topic></subject><relatedItem type="host"><titleInfo><title>Journal of Geophysical Research: Oceans</title></titleInfo><titleInfo type="abbreviated"><title>J. Geophys. Res.</title></titleInfo><genre type="journal">journal</genre><subject><genre>index-terms</genre><topic authorityURI="http://psi.agu.org/taxonomy5/0700">CRYOSPHERE</topic><topic authorityURI="http://psi.agu.org/taxonomy5/0758">Remote sensing</topic><topic authorityURI="http://psi.agu.org/taxonomy5/0794">Instruments and techniques</topic><topic authorityURI="http://psi.agu.org/taxonomy5/0766">Thermodynamics</topic><topic authorityURI="http://psi.agu.org/taxonomy5/1000">GEOCHEMISTRY</topic><topic authorityURI="http://psi.agu.org/taxonomy5/1011">Thermodynamics</topic><topic authorityURI="http://psi.agu.org/taxonomy5/3600">MINERALOGY AND PETROLOGY</topic><topic authorityURI="http://psi.agu.org/taxonomy5/3611">Thermodynamics</topic><topic authorityURI="http://psi.agu.org/taxonomy5/8400">VOLCANOLOGY</topic><topic authorityURI="http://psi.agu.org/taxonomy5/8411">Thermodynamics</topic></subject><identifier type="ISSN">0148-0227</identifier><identifier type="eISSN">2156-2202</identifier><identifier type="DOI">10.1002/(ISSN)2156-2202c</identifier><identifier type="CODEN">JGREA2</identifier><identifier type="PublisherID">JGRC</identifier><part><date>2008</date><detail type="volume"><caption>vol.</caption><number>113</number></detail><detail type="issue"><caption>no.</caption><number>C2</number></detail><extent unit="pages"><start>n/a</start><end>n/a</end><total>10</total></extent></part></relatedItem><identifier type="istex">857DA4BB640753A5877D5CA5448B6BC0D5279843</identifier><identifier type="DOI">10.1029/2006JC003930</identifier><identifier type="ArticleID">2006JC003930</identifier><accessCondition type="use and reproduction" contentType="copyright">Copyright 2008 by the American Geophysical Union.</accessCondition><recordInfo><recordContentSource>WILEY</recordContentSource></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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