Climatological description of seasonal variations in lower-tropospheric temperature inversion layers over the Indochina Peninsula
Climatological description of seasonal variations in lower-tropospheric temperature inversion layers over the Indochina Peninsula
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DOI：
10.1175/jcli3792.1
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发表时间：
2006-07-01
影响因子：
4.9
通讯作者：
Yamanaka, Manabu D.
中科院分区：
文献类型：
--
作者：
Nodzu, Masato I.;Ogino, Shin-Ya;Yamanaka, Manabu D.
为了了解亚洲大陆东南边缘中南半岛地区对流层下部极端稳定层的行为，本文利用业务雷达资料研究了静稳定度季节变化的气候学特征。静态稳定性是从位温垂直梯度(Delta theta/Delta z)来评价的。北半球冬季中南半岛地区经常出现稳定(Delta theta/Delta z>；10K km(-1))和不稳定(Delta theta/Delta z<；1K km(-1))层。北半球冬季稳定度的时间和垂直变化可分为三种特征类型，类型一：从旱季到雨季，中南半岛内陆地区和中国南部的平均稳定层高度从旱季到雨季增加2~5公里；类型二：类似于类型I，主要在中南半岛沿海地区出现高度接近1公里的稳定层；类型三：高度接近2公里的稳定层，主要在马来半岛上空。我们没有发现马来半岛上稳定层的垂直分布有任何显著的季节变化。
In this study operational rawinsonde data are used to investigate climatological features of seasonal variations in static stability in order to understand the behavior of temperature inversion layers, that is, extremely stable layers in the lower troposphere over the Indochina Peninsula region, at the southeastern edge of the Asian continent. Static stability was evaluated from the vertical gradient in potential temperature (Delta theta/Delta z).Stable (Delta theta/Delta z > 10 K km(-1)) and unstable (Delta theta/Delta z < 1 K km(-1)) layers frequently appear over the Indochina Peninsula region during boreal winter. Temporal and vertical variations in stability during the boreal winter can be categorized into three characteristic types, type I: the mean height of stable layers increases from 2 to 5 km from the dry to the rainy season over inland areas of the Indochina Peninsula and southern China; type II: similar to type I, with the additional occurrence of stable layers at a height of similar to 1 km, mainly over coastal areas of the Indochina Peninsula; and type III: stable layers at a height of similar to 2 km, mainly over the Malay Peninsula. We did not find any significant seasonal change in the vertical distribution of stable layers over the Malay Peninsula.