Ferrel环流之新解

由于Ferrel环流与中高纬度存在强盛的西风带这一现代大气观测手段所证实的事实相悖，对其是否存在，及其环流形态一直存在着很大的争议.本文利用1998～2003年的NCEP/NCAR（National Center for Environmental Prediction/National Center for Atmospheric Research， 美国国家环境预报中心/美国国家大气研究中心）再分析资料（10°×10°，经/纬度网格），根据北半球夏季（6～8月）太平洋地区（0°～60°N；160°E～120°W）的三维风场的基本特征，分析了北半球夏季太平洋地区平均经圈环流，特别是Ferrel环流的特征，发现Ferrel环流具有与已往研究不同的性质，并在此基础上提出了Ferrel环流新的概念模型，与过去的经典的环流概念模型相比能较好地描述高低空环流的基本特征，同时在考虑地球自转效应下，能够完满地解释中高纬度西风带的维持.

A new view on the Ferrel cell

There are many arguments in whether and how does the Ferrel cell exist because the upper level flow in the classical three cell circulation model has been proved contradict with the modern observations that there are westerlies in the mid and high latitudes. By using the NCEP/NCAR (National Center for Environmental Prediction/National Center for Atmospheric Research) reanalysis of daily with the horizontal resolution of 10°×10° (lat./lon. grid), the representative Pacific area (0°～ 60°N, 160°E～120°W) in northern hemisphere summer (Jun Jul Aug) is chosen to analyse the 3 D wind field, according to which the mean meridional circulation of the lower and middle latitudes, especially the Ferrel cell, is studied and a new concept model of Ferrel cell is carried out. Compared with the classical model, the new one describes more precisely the low and high level winds and has the ability to describe how the westerlies sustain on the real rotating Earth.