کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4674186 1634241 2010 19 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Nonlinear effects in the extended Eady model: Nonzero ββ but zero mean PV gradient
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علم هواشناسی
پیش نمایش صفحه اول مقاله
Nonlinear effects in the extended Eady model: Nonzero ββ but zero mean PV gradient
چکیده انگلیسی

An analytical solution in a small Rossby number approximation beyond quasigeostrophy is carried out for the extended Eady model with non-zero ββ, but zero mean potential vorticity gradient. The leading order solution exhibits symmetry in the geopotential height and potential temperature distributions standard for quasi-geostrophic approximation. In contrast, adding the ββ-effect into the first-order nonlinear dynamics results in a symmetry breaking. In addition to the high/low asymmetries, there also appears a meridional asymmetry resulting in an arching wave-train as a neutral mode at finite amplitude. These results may explain certain observed dynamical characteristics of synoptic and planetary-scale transients.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Dynamics of Atmospheres and Oceans - Volume 50, Issue 1, June 2010, Pages 93–111
نویسندگان
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