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The role of diurnal freeze-thaw cycles for summer melting on sea ice

Description: Das Projekt "The role of diurnal freeze-thaw cycles for summer melting on sea ice" wird vom Umweltbundesamt gefördert und von Universität Trier, Fachbereich VI Raum- und Umweltwissenschaften, Fach Umweltmeteorologie durchgeführt. Onset and duration of the summer melt period represent important variables for the seasonality of global sea-ice coverage and the analysis of climate variability in polar regions. The results of the former DFG project 'Surface melting / Antarctic' provide 20 years of data that can be used to investigate the long-term variability of the summer melt period on Antarctic sea ice. Our recent findings show diurnal freeze-thaw cycles to be significantly responsible for physical changes at the upper sea-ice surface during summer. Motivated by a lack of attention to this process in former studies, we will investigate the large-scale spatial and temporal characteristics of the occurrence of diurnal freeze-thaw cycles by means of satellite-derived microwave data with high temporal resolution. A bihemispheric comparison of the character of diurnal variations and their role in sea-ice surface changes at the transition from spring to summer is meant to provide new insights into differences in surface melting between the Arctic and Antarctic. The analysis of diurnal freeze-thaw cycles and their causes in this context is innovative and will significantly enhance our understanding of processes involved in the metamorphosis of snow and sea ice. The scientific links to other research fields are manifold and include the possibility to improve parameterizations of surface albedo and microwave emissivity as well as a better understanding of the surface energy and sea-ice mass balances at the commence of summer.

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Origin: /Bund/UBA/UFORDAT

Tags: Trier ? Mikrowellen ? Lack ? Klimatologie ? Meteorologie ? Satellitendaten ? Strahlungshaushalt ? Eis ? Fernerkundungsdaten ? Klimavariabilität ? Satellit ? Schneeschmelze ? Sommer ? Frost ? Metamorphose ? Antarktis ? Arktis ? Meereis ? Gletscherschwund ? Bilanz ? Daten ? Schnee ? Stoffbilanz ? Studie ? Nassverfahren ? Polargebiet ? Schmelzen ? Umweltwissenschaft ? Abdeckung ? Informationsgewinnung ? Globale Aspekte ?

Region: Rheinland-Pfalz

Bounding box: 7.5° .. 7.5° x 49.66667° .. 49.66667°

License: cc-by-nc-nd/4.0

Language: Deutsch

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Time ranges: 2008-07-01 - 2009-06-30

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