کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9480154 | 1626526 | 2005 | 22 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Upper-ocean vertical mixing in the Antarctic Polar Front Zone
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
زمین شناسی
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چکیده انگلیسی
The mixing regime of the upper 180Â m of a mesoscale eddy in the vicinity of the Antarctic Polar Front at 47âS and 21âE was investigated during the R.V. Polarstern cruise ANT XVIII/2 within the scope of the iron fertilization experiment EisenEx. On the basis of hydrographic CTD and ADCP profiles we deduced the vertical diffusivity Kz from two different parameterizations. Since these parameterizations bear the character of empirical functions, based on theoretical and idealized assumptions, they were inter alia compared with Cox-number and Thorpe-scale related diffusivities deduced from microstructure measurements, which supplied the first direct insights into turbulence of this ocean region. Values of Kz in the range of 10-4-10-3m2s-1 appear as a rather robust estimate of vertical diffusivity within the seasonal pycnocline. Values in the mixed layer above are more variable in time and reach 10-1m2s-1 during periods of strong winds. The results confirm a close agreement between the microstructure-based eddy diffusivities and eddy diffusivities calculated after the parameterization of Pacanowski and Philander [1981. Journal of Physical Oceanography 11, 1443-1451].
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Deep Sea Research Part II: Topical Studies in Oceanography - Volume 52, Issues 9â10, May 2005, Pages 1087-1108
Journal: Deep Sea Research Part II: Topical Studies in Oceanography - Volume 52, Issues 9â10, May 2005, Pages 1087-1108
نویسندگان
Boris Cisewski, Volker H. Strass, Hartmut Prandke,