کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1897487 1044541 2010 17 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
New nonlinear mechanisms of midlatitude atmospheric low-frequency variability
موضوعات مرتبط
مهندسی و علوم پایه ریاضیات ریاضیات کاربردی
پیش نمایش صفحه اول مقاله
New nonlinear mechanisms of midlatitude atmospheric low-frequency variability
چکیده انگلیسی
The observed attractors exhibit spatial and temporal low-frequency patterns comparing well with those observed in the atmosphere. For h0≤800m the periodic orbits have a period of about 10 days and patterns in the vorticity field propagate eastward. For h0≥800m, the period is longer (30-60 days) and patterns in the vorticity field are non-propagating. The dynamics on the strange attractors are associated with low-frequency variability: the vorticity fields show weakening and strengthening of non-propagating planetary waves on time scales of 10-200 days. The spatio-temporal characteristics are “inherited” (by intermittency) from the two families of periodic orbits and are detected in a relatively large region of the parameter plane. This scenario provides a characterisation of low-frequency variability in terms of intermittency due to bifurcations of waves.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica D: Nonlinear Phenomena - Volume 239, Issue 10, 15 May 2010, Pages 702-718
نویسندگان
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