ARCTIC The Use of AVHRR Thermal Infrared Imagery to Determine Sea Ice Thickness within the Chukchi Polynya
ABSTRACT. Sea ice thickness changes over a nine-day period are determined for the Chukchi Polynya using Maykut’s (1986) and Kuhn et al.’s (1975) theoretical predictive models. The models relate ice thickness to sea ice surface temperature., air temperature, wind speed, and sea water tem-perature. Se...
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| Format: | Text |
| Language: | English |
| Published: |
1990
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.545.9710 http://pubs.aina.ucalgary.ca/arctic/arctic44-s-130.pdf |
| Summary: | ABSTRACT. Sea ice thickness changes over a nine-day period are determined for the Chukchi Polynya using Maykut’s (1986) and Kuhn et al.’s (1975) theoretical predictive models. The models relate ice thickness to sea ice surface temperature., air temperature, wind speed, and sea water tem-perature. Sea ice surface temperatures are derived from AVHRR imagery and meteorological observations are taken from the synoptic weather sta-tion at Barrow, Alaska. The Maykut equation yields results that appear to be realistic for the ice thickness distribution within the polynya at the beginning stages of polynya formation. Ice thickness calculations at the later stages of polynya formation are partially invalidated by the movement of large floes to the oldest part of the polynya in response to a wind from the northeast. Such a major disturbance on the surface of the polynya com-plicates the identification of the type and thickness of ice that is forming. These results offer encouragement for the prospects of future field studies to validate and refine the technique and for the extension of the technique to calculation of heat transfer and salt rejection within the Chukchi Polynya and other polynyas. Key words: polynya, Chukchi Sea, ice thickness, AVHRR imagery, surface heat transfer, ice growth RÉSUMB. On a déterminé les changements dans I’épaisseur de la glace sur une #riode de neuf jours dans la polynia de la mer des Tchouktches, en utilisant les modbles de prédiction théoriques de Maykut (1986) et de Kuhn et al. (1975). Ces modbles établissent une relation entre d’une part I’épaisseur de la glace t d’autre part sa temp6rature de surface, la temp6rature de l’air, la vitesse du vent et la temp6rature de l’eau de mer. Les tem-pératures de la surface de l’eau de mer sont tirées des images prises au radiombtre perfectionné B trbs haute résolution, et les observations météorologiques proviennent de la station de météorologie synoptique de Barrow en Alaska. L’Cquation de Maykut donne des r6sultats qui semblent |
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