Publication Abstracts

Rind et al. 2001

Rind, D., G.L. Russell, G.A. Schmidt, S. Sheth, D. Collins, P. Demenocal, and J. Teller, 2001: Effects of glacial meltwater in the GISS Coupled Atmosphere-Ocean Model: Part II: A bi-polar seesaw in Atlantic Deep Water production. J. Geophys. Res., 106, 27355-27366, doi:10.1029/2001JD000954.

The relationship between the Northern Hemisphere and Southern Hemisphere deep water circulation systems is explored in experiments with gradual and impulsive freshwater input through the St. Lawrence. With sufficient freshwater volume input (50 Sv years), North Atlantic Deep Water (NADW) cessation occurs, as does substantial cooling in the Northern Hemisphere. The colder temperatures are accompanied by increased mass and sea level pressure in the Northern Hemisphere, with corresponding lower pressure in the Southern Hemisphere. The low pressure response occurs at high Southern latitudes, consistent with the Antarctic Annular Mode, the leading mode of variability in the current climate. Stronger winds associated with this increased cyclonicity intensify the Antarctic Circumpolar Current, with heat flux divergences in the South Atlantic and convergences and warming in the Indian Ocean. Weddell Sea Bottom Water production increases in response to the South Atlantic high latitude cooling and sea ice growth, hence acting as a "seesaw" with the decreasing NADW, and even global Antarctic Bottom Water ases although not as strongly. The initial "seesaw" response s within a few years, although it takes some 100 years to ize due to the response time of the ACC. The South Atlantic warming occurs approximately in phase with North Atlantic, so the "seesaw" is not in temperature within that ocean basin; however, warming in portions of the Southern Indian Ocean occur out of phase with Northern Hemisphere cooling. NADW does not resume of its own accord once complete cessation occurs even when freshwater input is stopped, but when increased evaporation is used to force NADW formation temporarily, Weddell Sea Bottom Water decreases accordingly.

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BibTeX Citation

@article{ri01200l,
  author={Rind, D. and Russell, G. L. and Schmidt, G. A. and Sheth, S. and Collins, D. and Demenocal, P. and Teller, J.},
  title={Effects of glacial meltwater in the GISS Coupled Atmosphere-Ocean Model: Part II: A bi-polar seesaw in Atlantic Deep Water production},
  year={2001},
  journal={J. Geophys. Res.},
  volume={106},
  pages={27355--27366},
  doi={10.1029/2001JD000954},
}

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RIS Citation

TY  - JOUR
ID  - ri01200l
AU  - Rind, D.
AU  - Russell, G. L.
AU  - Schmidt, G. A.
AU  - Sheth, S.
AU  - Collins, D.
AU  - Demenocal, P.
AU  - Teller, J.
PY  - 2001
TI  - Effects of glacial meltwater in the GISS Coupled Atmosphere-Ocean Model: Part II: A bi-polar seesaw in Atlantic Deep Water production
JA  - J. Geophys. Res.
VL  - 106
SP  - 27355
EP  - 27366
DO  - 10.1029/2001JD000954
ER  -

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