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Spatio-temporal variability of small-scale leads based on helicopter maps of winter sea ice surface temperatures

Thielke, Linda und Spreen, Gunnar und Huntemann, Marcus und Murashkin, Dmitrii (2024) Spatio-temporal variability of small-scale leads based on helicopter maps of winter sea ice surface temperatures. Elementa : Science of the Anthropocene, 12 (1), Seiten 1-20. BioOne. doi: 10.1525/elementa.2023.00023. ISSN 2325-1026.

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Offizielle URL: https://dx.doi.org/10.1525/elementa.2023.00023

Kurzfassung

Observations of sea ice surface temperature provide crucial information for studying Arctic climate, particularly during winter. We examined 1 m resolution surface temperature maps from 35 helicopter flights between October 2, 2019, and April 23, 2020, recorded during the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC). The seasonal cycle of the average surface temperature spanned from 265.6 K on October 2, 2019, to 231.8 K on January 28, 2020. The surface temperature was affected by atmospheric changes and varied across scales. Leads in sea ice (cracks of open water) were of particular interest because they allow greater heat exchange between ocean and atmosphere than thick, snow-covered ice. Leads were classified by a temperature threshold. The lead area fraction varied between 0% and 4% with higher variability on the local (5–10 km) than regional scale (20–40 km). On the regional scale, it remained stable at 0–1% until mid-January, increasing afterward to 4%. Variability in the lead area is caused by sea ice dynamics (opening and closing of leads), as well as thermodynamics with ice growth (lead closing). We identified lead orientation distributions, which varied between different flights but mostly showed one prominent orientation peak. The lead width distribution followed a power law with a negative exponent of 2.63, which is in the range of exponents identified in other studies, demonstrating the comparability to other data sets and extending the existing power law relationship to smaller scales down to 3 m. The appearance of many more narrow leads than wide leads is important, as narrow leads are not resolved by current thermal infrared satellite observations. Such smallscale lead statistics are essential for Arctic climate investigations because the ocean–atmosphere heat exchange does not scale linearly with lead width and is larger for narrower leads.

elib-URL des Eintrags:https://elib.dlr.de/203987/
Dokumentart:Zeitschriftenbeitrag
Zusätzliche Informationen:Corresponding author: Email: gunnar.spreen@uni-bremen.de; How to cite: follow link or s. PDF
Titel:Spatio-temporal variability of small-scale leads based on helicopter maps of winter sea ice surface temperatures
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Thielke, LindaUniversity of Bremen, Institute of Environmental Physics (IUP), Bremen, GermanyNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Spreen, GunnarUniversity of Bremen, Institute of Environmental Physics (IUP), Bremen, Germanyhttps://orcid.org/0000-0003-0165-8448NICHT SPEZIFIZIERT
Huntemann, MarcusUniversity of Bremen, Institute of Environmental Physics (IUP), Bremen, GermanyNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Murashkin, Dmitriidmitrii.murashkin (at) dlr.de/ University of Bremen, Germanyhttps://orcid.org/0000-0002-5818-0038NICHT SPEZIFIZIERT
Datum:27 März 2024
Erschienen in:Elementa : Science of the Anthropocene
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:12
DOI:10.1525/elementa.2023.00023
Seitenbereich:Seiten 1-20
Verlag:BioOne
Name der Reihe:The Multidisciplinary Drifting Observatory for the Study of Arctic Climate (MOSAiC)
ISSN:2325-1026
Status:veröffentlicht
Stichwörter:Oceanography, SAR, Arctic, Sea ice, Leads, Surface temperature, Helicopter, MOSAiC
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erdbeobachtung
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):R - SAR-Methoden
Standort: Bremen , Oberpfaffenhofen
Institute & Einrichtungen:Institut für Methodik der Fernerkundung > SAR-Signalverarbeitung
Hinterlegt von: Kaps, Ruth
Hinterlegt am:29 Apr 2024 10:42
Letzte Änderung:29 Apr 2024 11:53

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