On the Structure of the “Baiu Front” and the Associated Intermediate-scale Disturbances in the Lower Atmosphere
On the Structure of the “Baiu Front” and the Associated Intermediate-scale Disturbances in the Lower Atmosphere
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论“白乌锋”的结构及相关的低层大气中尺度扰动
DOI：
10.2151/jmsj1965.48.6_479
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发表时间：
1970
影响因子：
3.1
通讯作者：
M. Takeuchi
中科院分区：
文献类型：
--
作者：
S. Matsumoto;S. Yoshizumi;M. Takeuchi
在1968年7月8日至7月12日为期4天的项目观察期间，“巴尤阵线”活动几乎稳定地在远东地区盛行。因此考察了“白乌锋”附近各种气象要素的平均场。最显着的结构不是在热分层中，而是在具有相当大的地转性的低空急流的风场中。低空急流的存在似乎与降水密切相关，因此也可能与结缔活动密切相关。沿强斜压场集中区，产生波长小于1000km的低层对流层扰动，并先后向东北偏东方向移动，带来间隔约20小时的周期性大量降水。相关的热场表明存在间接环流，但尽管如此，扰动确实发生了。三种不同尺度运动之间的能量转换过程，即。即，研究了一般天气尺度、中尺度（锋面扰动）和小尺度（对流）。有人认为，中尺度扰动的动能是由对流尺度运动的动能转化而来的。
During the 4-day period of project observation, July 8-July 12, 1968, the "Baiu front" activity was prevailing almost steadily over the Far East. Therefore the averaged fields of various meteorological elements in the vicinity of "Baiu front" are examined. The most remarkable structure is found not in the thermal stratification but in the wind field with a low-level jet which is considerably ageostrophic. The existence of low-level jet stream seems to be deeply related with the precipitation and, therefore probably, with the connective activity. Along the concentrated zone of strongly baroclinic field, lower tropospheric disturbances of wave lengths less than 1,000km were generated and moved east-northeastwards uccessively, bringing a large amount of precipitation periodically at an interval of about 20 hours. The associated thermal field indicated the existence of indirect circulation, but, nevertheless, disturbances diddevelop. The energy conversion processes among three different scales of motion, i. e., generalsynoptic scale, intermediate scale (frontal disturbances) and small scale (convection) are studied. It is suggested that the kinetic energy of intermediate-scale disturbances is transformed from the kinetic energy of convective-scale motion.