Sensitivity of simulated salinity in a three-dimensional ocean model to upper ocean transport of salt from sea-ice formation

Details Sensitivity of simulated salinity in a three-dimensional ocean model to upper ocean transport of salt from sea-ice formation Sensitivity of simulated salinity in a three-dimensional ocean model to upper ocean transport of salt from sea-ice formation

Jun 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.1323d&link_type=abstract

Geophysical Research Letters, Volume 24, Issue 11, p. 1323-1326

Physics

19

Oceanography: General: Numerical Modeling, Oceanography: General: Arctic And Antarctic Oceanography, Oceanography: Physical: Ice Mechanics And Air/Sea/Ice Exchange Processes, Oceanography: Physical: Upper Ocean Processes

Scientific paper

We show that explicit representation of sinking of salt rejected during sea-ice formation dramatically improves simulated salinity in an ocean general circulation model (OGCM). In our ``control'' simulation, rejected salt goes into the top model layer, and simulated salinities are typical of OGCMs: the deep ocean is too fresh, and the intermediate-depth salinity minimum associated with Antarctic Intermediate Water is absent. These problems are eliminated in our ``test'' simulation, in which we distribute rejected salt uniformly over the upper 160 m. Also, the strength of the Antarctic Circumpolar Current is more realistic in this simulation. These results show the need for, but do not provide, a better representation of sinking of rejected salt. The sensitivity of our model to sinking of rejected salt suggests that a similar sensitivity may exist in the real ocean, and that loss of Antarctic sea ice might have major effects.

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