Investigations of newly formed sea ice in the Cape Bathurst polynya: 2. Microwave emission
Identifieur interne : 002570 ( Main/Exploration ); précédent : 002569; suivant : 002571Investigations of newly formed sea ice in the Cape Bathurst polynya: 2. Microwave emission
Auteurs : Byong Jun Hwang [Canada] ; Jens K. Ehn [Canada] ; David G. Barber [Canada] ; Ryan Galley [Canada] ; Thomas C. Grenfell [États-Unis]Source :
- Journal of Geophysical Research: Oceans [ 0148-0227 ] ; 2007-05.
Abstract
This study examines the role of newly formed sea ice geophysical state on microwave emission. Coincident with sea ice geophysical sampling, ship‐based passive microwave emission data (dual‐polarized at 19, 37 and 85 GHz) were collected in the Cape Bathurst Polynya during 18 October and 13 November 2003. Using polarization ratios (PRs), we found that bare thin ice was separable from snow‐covered ice. Thin snow (equal to 0.02–0.13 m) thickness is significantly correlated with the spectral gradient ratios GRV(85,19) (R2 = 0.55, P‐value <0.05) and GRV(85,37) (R2 = 0.66, P‐value < 0.05), but not with GRV(37,19) (R2 = 0.19, P‐value > 0.2). The relationship between atmospherically corrected R37 and bare ice thickness showed an exponential relationship very comparable to that reported by Martin et al. [2004], which is ascribed to the reduction of bare ice surface salinity based on both observational and modeling studies. However, the relationship quickly becomes invalid for even thin snow covered ice, due to significant impact of thin wet (liquid water fraction ∼0.02–0.04) snow on microwave emission. Our results suggest that the sea ice algorithms NASA Team and NASA Team 2 could underestimate total ice concentration over thin bare ice by 35% on average, while both algorithms underestimate the total ice concentration by 20% over snow‐covered ice. Using PR(85) sea ice could be delineated from open water using a properly adjusted threshold value accounting for cloud or fog effects, possibly with the exception of dark nilas and/or bare consolidated pancakes.
Url:
DOI: 10.1029/2006JC003703
Affiliations:
- Canada, États-Unis
- Manitoba, Washington (État)
- Seattle, Winnipeg
- Université de Washington, Université du Manitoba
Links toward previous steps (curation, corpus...)
- to stream Istex, to step Corpus: 001482
- to stream Istex, to step Curation: 001482
- to stream Istex, to step Checkpoint: 000A50
- to stream Main, to step Merge: 002813
- to stream Main, to step Curation: 002570
Le document en format XML
<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title xml:lang="en">Investigations of newly formed sea ice in the Cape Bathurst polynya: 2. Microwave emission</title><author><name sortKey="Hwang, Byong Jun" sort="Hwang, Byong Jun" uniqKey="Hwang B" first="Byong Jun" last="Hwang">Byong Jun Hwang</name></author><author><name sortKey="Ehn, Jens K" sort="Ehn, Jens K" uniqKey="Ehn J" first="Jens K." last="Ehn">Jens K. Ehn</name></author><author><name sortKey="Barber, David G" sort="Barber, David G" uniqKey="Barber D" first="David G." last="Barber">David G. Barber</name></author><author><name sortKey="Galley, Ryan" sort="Galley, Ryan" uniqKey="Galley R" first="Ryan" last="Galley">Ryan Galley</name></author><author><name sortKey="Grenfell, Thomas C" sort="Grenfell, Thomas C" uniqKey="Grenfell T" first="Thomas C." last="Grenfell">Thomas C. Grenfell</name></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:EA6D621021F5B22909F88DB35E52EC893B7748D7</idno><date when="2007" year="2007">2007</date><idno type="doi">10.1029/2006JC003703</idno><idno type="url">https://api-v5.istex.fr/document/EA6D621021F5B22909F88DB35E52EC893B7748D7/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">001482</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">001482</idno><idno type="wicri:Area/Istex/Curation">001482</idno><idno type="wicri:Area/Istex/Checkpoint">000A50</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Checkpoint">000A50</idno><idno type="wicri:doubleKey">0148-0227:2007:Hwang B:investigations:of:newly</idno><idno type="wicri:Area/Main/Merge">002813</idno><idno type="wicri:Area/Main/Curation">002570</idno><idno type="wicri:Area/Main/Exploration">002570</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main" xml:lang="en">Investigations of newly formed sea ice in the Cape Bathurst polynya: 2. Microwave emission</title><author><name sortKey="Hwang, Byong Jun" sort="Hwang, Byong Jun" uniqKey="Hwang B" first="Byong Jun" last="Hwang">Byong Jun Hwang</name><affiliation wicri:level="4"><country xml:lang="fr">Canada</country><wicri:regionArea>Centre for Earth Observation Science, University of Manitoba, Winnipeg, Manitoba</wicri:regionArea><orgName type="university">Université du Manitoba</orgName><placeName><settlement type="city">Winnipeg</settlement><region type="state">Manitoba</region></placeName></affiliation><affiliation wicri:level="1"><country wicri:rule="url">Canada</country></affiliation></author><author><name sortKey="Ehn, Jens K" sort="Ehn, Jens K" uniqKey="Ehn J" first="Jens K." last="Ehn">Jens K. Ehn</name><affiliation wicri:level="4"><country xml:lang="fr">Canada</country><wicri:regionArea>Centre for Earth Observation Science, University of Manitoba, Winnipeg, Manitoba</wicri:regionArea><orgName type="university">Université du Manitoba</orgName><placeName><settlement type="city">Winnipeg</settlement><region type="state">Manitoba</region></placeName></affiliation></author><author><name sortKey="Barber, David G" sort="Barber, David G" uniqKey="Barber D" first="David G." last="Barber">David G. Barber</name><affiliation wicri:level="4"><country xml:lang="fr">Canada</country><wicri:regionArea>Centre for Earth Observation Science, University of Manitoba, Winnipeg, Manitoba</wicri:regionArea><orgName type="university">Université du Manitoba</orgName><placeName><settlement type="city">Winnipeg</settlement><region type="state">Manitoba</region></placeName></affiliation></author><author><name sortKey="Galley, Ryan" sort="Galley, Ryan" uniqKey="Galley R" first="Ryan" last="Galley">Ryan Galley</name><affiliation wicri:level="4"><country xml:lang="fr">Canada</country><wicri:regionArea>Centre for Earth Observation Science, University of Manitoba, Winnipeg, Manitoba</wicri:regionArea><orgName type="university">Université du Manitoba</orgName><placeName><settlement type="city">Winnipeg</settlement><region type="state">Manitoba</region></placeName></affiliation></author><author><name sortKey="Grenfell, Thomas C" sort="Grenfell, Thomas C" uniqKey="Grenfell T" first="Thomas C." last="Grenfell">Thomas C. Grenfell</name><affiliation wicri:level="4"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Atmospheric Sciences, University of Washington, Washington, Seattle</wicri:regionArea><orgName type="university">Université de Washington</orgName><placeName><settlement type="city">Seattle</settlement><region type="state">Washington (État)</region></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Geophysical Research: Oceans</title><title level="j" type="abbrev">J. Geophys. Res.</title><idno type="ISSN">0148-0227</idno><idno type="eISSN">2156-2202</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><date type="published" when="2007-05">2007-05</date><biblScope unit="volume">112</biblScope><biblScope unit="issue">C5</biblScope><biblScope unit="page" from="/">n/a</biblScope><biblScope unit="page" to="/">n/a</biblScope></imprint><idno type="ISSN">0148-0227</idno></series><idno type="istex">EA6D621021F5B22909F88DB35E52EC893B7748D7</idno><idno type="DOI">10.1029/2006JC003703</idno><idno type="ArticleID">2006JC003703</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0148-0227</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">This study examines the role of newly formed sea ice geophysical state on microwave emission. Coincident with sea ice geophysical sampling, ship‐based passive microwave emission data (dual‐polarized at 19, 37 and 85 GHz) were collected in the Cape Bathurst Polynya during 18 October and 13 November 2003. Using polarization ratios (PRs), we found that bare thin ice was separable from snow‐covered ice. Thin snow (equal to 0.02–0.13 m) thickness is significantly correlated with the spectral gradient ratios GRV(85,19) (R2 = 0.55, P‐value <0.05) and GRV(85,37) (R2 = 0.66, P‐value < 0.05), but not with GRV(37,19) (R2 = 0.19, P‐value > 0.2). The relationship between atmospherically corrected R37 and bare ice thickness showed an exponential relationship very comparable to that reported by Martin et al. [2004], which is ascribed to the reduction of bare ice surface salinity based on both observational and modeling studies. However, the relationship quickly becomes invalid for even thin snow covered ice, due to significant impact of thin wet (liquid water fraction ∼0.02–0.04) snow on microwave emission. Our results suggest that the sea ice algorithms NASA Team and NASA Team 2 could underestimate total ice concentration over thin bare ice by 35% on average, while both algorithms underestimate the total ice concentration by 20% over snow‐covered ice. Using PR(85) sea ice could be delineated from open water using a properly adjusted threshold value accounting for cloud or fog effects, possibly with the exception of dark nilas and/or bare consolidated pancakes.</div></front></TEI><affiliations><list><country><li>Canada</li><li>États-Unis</li></country><region><li>Manitoba</li><li>Washington (État)</li></region><settlement><li>Seattle</li><li>Winnipeg</li></settlement><orgName><li>Université de Washington</li><li>Université du Manitoba</li></orgName></list><tree><country name="Canada"><region name="Manitoba"><name sortKey="Hwang, Byong Jun" sort="Hwang, Byong Jun" uniqKey="Hwang B" first="Byong Jun" last="Hwang">Byong Jun Hwang</name></region><name sortKey="Barber, David G" sort="Barber, David G" uniqKey="Barber D" first="David G." last="Barber">David G. Barber</name><name sortKey="Ehn, Jens K" sort="Ehn, Jens K" uniqKey="Ehn J" first="Jens K." last="Ehn">Jens K. Ehn</name><name sortKey="Galley, Ryan" sort="Galley, Ryan" uniqKey="Galley R" first="Ryan" last="Galley">Ryan Galley</name><name sortKey="Hwang, Byong Jun" sort="Hwang, Byong Jun" uniqKey="Hwang B" first="Byong Jun" last="Hwang">Byong Jun Hwang</name></country><country name="États-Unis"><region name="Washington (État)"><name sortKey="Grenfell, Thomas C" sort="Grenfell, Thomas C" uniqKey="Grenfell T" first="Thomas C." last="Grenfell">Thomas C. Grenfell</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
EXPLOR_STEP=$WICRI_ROOT/Wicri/Canada/explor/ParkinsonCanadaV1/Data/Main/Exploration
HfdSelect -h $EXPLOR_STEP/biblio.hfd -nk 002570 | SxmlIndent | more
Ou
HfdSelect -h $EXPLOR_AREA/Data/Main/Exploration/biblio.hfd -nk 002570 | SxmlIndent | more
Pour mettre un lien sur cette page dans le réseau Wicri
{{Explor lien
|wiki= Wicri/Canada
|area= ParkinsonCanadaV1
|flux= Main
|étape= Exploration
|type= RBID
|clé= ISTEX:EA6D621021F5B22909F88DB35E52EC893B7748D7
|texte= Investigations of newly formed sea ice in the Cape Bathurst polynya: 2. Microwave emission
}}
| This area was generated with Dilib version V0.6.29. |  |