SURFACE-FEATURES OF WINTER MONSOON SURGES OVER SOUTH CHINA
SURFACE-FEATURES OF WINTER MONSOON SURGES OVER SOUTH CHINA
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DOI：
10.1175/1520-0493(1995)123
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发表时间：
1995-03-01
影响因子：
3.2
通讯作者：
CHAN, JCL
中科院分区：
文献类型：
--
作者：
WU, MC;CHAN, JCL
本文研究了华南冬季风两类涌波的地面特征：东风涌波（ES）和北风涌波（NS）。本文分析了1988~1991年三个冬季（夏季~3月）15 °~50 ° N、90 °~130 ° E范围内的地面气象参数。在北涌过程中，地面特征表现为：（1）温度突然下降，风向由东向北转变，这可能与冷锋过境有关;（2）露点低压增加;（3）南北气压梯度大。另一方面，东风波的出现与强东风有关，风速可达40 km h（-1）左右，温度和气压变化不大，高压中心从大兴岗岭向黄海东南移动，并沿中国东部沿海沿着形成一个尖锐的高压脊。此外，一个ES和NS与不同的扰动（异常）的压力，风温，和露点低压相比，冬季正常条件。结果表明，在天气尺度上的两个浪涌之间有明显的区别。
The surface features associated with two kinds of winter monsoon surges over south China are studied: the easterly surge (ES)and the northerly surge(NS). Surface meteorological parameters over the region 15 degrees-50 degrees N, 90 degrees-130 degrees E for the surges that occurred in the three winters (October-March) from 1988 to 1991 are analyzed. For the northerly surge, the surface features found are 1) an abrupt temperature drop and wind direction turning from easterly to northerly, which can be related to the passage of a cold front; 2) an increase in the dewpoint depression; and 3) a large north-south pressure gradient. On the other hand, the easterly surge is found to be associated with strong easterly winds up to approximately 40 km h(-1), little temperature or pressure change, and a southeastward motion of a high pressure center from Dahinggangling to the Yellow Sea together with a sharp pressure ridge along the east China coast. Furthermore, an ES and an NS are associated with different perturbations (anomalies) in pressure, wind temperature, and dewpoint depression when compared with the wintertime normal condition. The results suggest a clear distinction between the two surges on the synoptic scale.