Recurring polynyas over the Cosmonaut Sea and the Maud Rise

Two remarkable deep ocean polynyas observed in the Antarctic region during the winter of 1980, here referred to as the Cosmonaut polynya and the Maud Rise polynya, are discussed. It is proposed that both polynyas are products of deep-reaching convection which introduces warmer deep water into the surface layer. Hydrographic data at both sites indicate the existence of localized doming of the pycnocline. This brings warmer, saltier deep water close to the sea surface, which has been demonstrated to be an effective preconditioner for deep-reaching convection. A possible relationship between the two polynyas is sugggested in that both are in the eastern margins of the Weddell Sea.

[1]  J. Comiso,et al.  Multifrequency Passive Microwave Observations of First-Year Sea Ice Grown in a Tank , 1986, IEEE Transactions on Geoscience and Remote Sensing.

[2]  Cornelius W. Sullivan,et al.  Satellite microwave and in situ observations of the Weddell Sea ice cover and its marginal ice zone , 1986 .

[3]  Diffusion of sea ice , 1986 .

[4]  S. Jacobs.  Oceanology of the Antarctic continental shelf , 1985 .

[5]  Stephen F. Ackley,et al.  Sea ice structure and biological activity in the Antarctic marginal ice zone , 1984 .

[6]  Josefino C. Comiso,et al.  Antarctic sea ice microwave signatures and their correlation with in situ ice observations , 1984 .

[7]  A. Gordon,et al.  Winter mixed layer entrainment of Weddell Deep Water , 1984 .

[8]  A. Gordon,et al.  Thermohaline stratification below the Southern Ocean sea ice , 1984 .

[9]  S. Ackley,et al.  Numerical simulation of the Weddell Sea pack ice , 1983 .

[10]  H. Zwally,et al.  Antarctic Sea Ice, 1973-1976: Satellite Passive-Microwave Observations , 1983 .

[11]  D. Bromwich,et al.  Experiences of Scott's Northern Party: evidence for a relationship between winter katabatic winds and the Terra Nova Bay polynya , 1982, Polar Record.

[12]  Arnold L. Gordon,et al.  Seasonality of Southern Ocean sea ice , 1981 .

[13]  D. Martinson,et al.  A Convective Model for the Weddell Polynya , 1981 .

[14]  S. Ackley.  Sea-ice atmosphere interactions in the Weddell Sea using drifting buoys , 1981 .

[15]  F. Carsey.  Microwave Observation of the Weddell Polynya , 1980 .

[16]  G. Deacon.  The Weddell gyre , 1979 .

[17]  Akira Okubo,et al.  Oceanic diffusion diagrams , 1971 .