Abstract
Coastal polynyas off East Queen Maud Land in Antarctica are examined using NOAA AVHRR infrared data. From image analyses, two locations of coastal polynyas in this region are identified; one in Breid Bay and the other along the shelf break. The areal coverage of the Breid Bay polynya is significantly related to the strength of katabatic winds, which maintain their strength over the coastal sea due to land topography favoring for their confluence, thereby being capable of removing newly formed ice. Land fast ice in the eastern part of the bay also plays an additional role in the formation mechanism. It is also found that the areal coverage of coastal polynyas in this region fluctuate coherently. Moreover, these fluctuations correspond to the synoptic index, which measures the strength of the offshore wind, with their peaks closely associated with the areal peaks. These facts strongly suggest the influence of synoptic scale weather on the formation and maintenance of polynyas in this region.
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References
Bromwich, D. H. and D. D. Kurtz (1984): katabatic wind forcing of the Terra Nova Bay Polynya.J. Geophys. Res.,89, 3561–3572.
Cavalieri, D. J. and S. Martin (1985): A passive microwave study of polynyas along the Antarctic Wilkes Land Coast. p. 227–252. InOceanology of the Antarctic Continental Shelf, Antarct. Res. Ser., Vol. 43, ed. by S. S. Jacobs, AGU, Washington, D. C.
Gordon, A. L. and J. C. Comiso (1988): Polynyas in the Southern Ocean.Sci. Am.,256, 90–97.
Ishikawa, T. (1991): The characteristic and variability of coastal polynyas off Queen Maud Land Antarctica. Ms. Thesis, Hokkaido University, Sapporo, 59 pp (in Japanese).
Iwanami, K. and H. Tohju (1987):Oceanographic data of the 26th Japanese Antarctic Research Expedition from November 1984 to April 1985. JARE Data Rep., 126. Jpn. Antarct. Res. Exped., Tokyo, 59 pp.
Kikuchi, T and Y. Ageta (1989): A preliminary estimate of inertia effects in a bulk model of katabatic wind.Proc. NIPR Symp. Polar Meteorol. Glaciol.,2, 61–69.
Knapp, W. W. (1972): Satellite observations of large polynyas in polar waters. p. 201–212. InSea Ice, ed. by T. Karlsson, National Research Council, Reykjavik, Iceland.
Kurtz, D. D. and D. H. Bromwich (1983): Satellite observed behavior of the Terra Nova Bay polynya.J. Geophys. Res.,88, 9717–9722.
Ohshima, K. I., T. Takizawa, S. Ushio and T. Kawamura (1996): Seasonal variations of the Antarctic coastal ocean in the vicinity of Lützow-Holm Bay.J. Geophys. Res. (in press).
Smith, S., R. D. Muench and C. H. Pease (1990): Polynyas and leads: an overview of physical processes and environment.J. Geophys. Res.,95, 9461–9479.
Tanaka, S., K. Suzuki, T. Yamanouchi and S. Kawaguchi (1985): Atmospheric effects against the surface temperature measurement by AVHRR in the polar region.Mem. Natl. Polar Res., Spec. Issue,39, 80–86.
Ushio, S., T. Takizawa, K. I. Oshima and T. Kawamura (1993): Thermal structure of the coastal polynya off Syowa Station.Antarctica, Nankyoku Shiryo,37, 252–259 (in Japanese).
World Meteorological Organization (1970): WMO sea ice nomenclature. WMO Rep. 259, T. P. 145, WMO, Geneva, 147 pp.+8 suppl.
Yamanouchi, T. and K. Seko (1992):Antarctica from NOAA Satellites,—Clouds, Ice and Snow—. National Institute of Polar Research, Tokyo, 91 pp.
Yamanouchi, T. and M. Wada (1992): Microwave signature of polar firn and sea ice in the Antarctic from airborne observation.Proc. NIPR Symp. Polar Meteorol. Glaciol.,6, 16–35.
Yasunari, T. and S. Kodama (1993): Intraseasonal variability of katabatic wind over East Antarctica and planetary flow regime in the Southern Hemisphere.J. Geophys. Res.,98, 13063–13070.
Zwally, H. J., J. C. Comiso, W. J. Cambell, F. D. Carsey and P. Gloersen (1983): Antarctic sea ice cover 1973–1976 from satellite passive microwave observations. NASA Spec. Publ, NASA Goddard Space Flight Center, Greenbelt, Md.
Zwally, H. J., J. C. Comiso and A. L. Gordon (1985): Antarctic offshore leads and polynyas and oceanographic effects. p. 203–226. InOceanology of the Antarctic Continental Shelf, Antarct. Res. Ser., Vol. 43, ed. by S. S. Jacobs, AGU, Washington, D. C.
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Ishikawa, T., Ukita, J., Ohshima, K.I. et al. Coastal polynyas off East Queen Maud Land observed from NOAA AVHRR data. J Oceanogr 52, 389–398 (1996). https://doi.org/10.1007/BF02235932
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DOI: https://doi.org/10.1007/BF02235932