%0 Journal Article
%T GLOBAL CHARACTERISTICS OF 30-60 DAY ATMOSPHERIC OSCILLATION<br>30—60天大气振荡的全球特征
%A Li Chongyin
%A <br>李崇银
%J 大气科学
%D 1991
%I 
%X The global characteristics of intraseasonal ( 30-60 day ) atmospheric oscillation are investigated by using ECMWF data . The distribution of kinetic energy of the 30 - 60 day oscillation shows it is a very large in the high latitudes. This means the 30-60 day atmospheric oscillation is prominent in the high latitudes as in the tropical atmosphere . The 30 - 60 day oscillations in the middle-high latitudes are clearly different properties with that in the tropical atmosphere . They are barotropical modes for vertical structure , dominated by perturbances of zonal wavenumbers 2 - 4 and propagate slowly westwards. The low - frequency teleconnection is very obvious for the 30 - 60 day oscillation . There are mainly the Europe-Asia-Pacific (EAP) pattern and PNA pattern in the Northern Hemisphere, and the Australia- South Africa ( ASA ) pattern and Round South America ( RSA ) pattern . Especially , above - low - frequency teleconnection patterns link each other in the global atmosphere and constitute two low - frequency wavetrains , i . e . EAP-ASA wavetrain and PNA-RSA wavetrain, or EAP-RSA wavetrain and ASA-PNA-wavetrain. There are obvious interactions of 30-60 day oscillation between the Northern and Southern Hemisphere, and their three fundamental processes are discussed in this paper.
%K Low - frequency teleconnection
%K Low - frequency wavetrian Barotropical mode<br>大气低频遥相关
%K 低频波列
%K 正压模态
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=28A2F569B2458C17&jid=46874A5A102033D774D00D819E91CD68&aid=EC559FDF47695B03&yid=116CB34717B0B183&vid=23CCDDCD68FFCC2F&iid=38B194292C032A66&sid=5C3443B19473A746&eid=228A710F49B6CE58&journal_id=1006-9895&journal_name=大气科学&referenced_num=10&reference_num=12