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首页> 外文期刊>Atmospheric chemistry and physics >A daytime climatological distribution of high opaque ice cloud classes over the Indian summer monsoon region observed from 25-year AVHRR data
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A daytime climatological distribution of high opaque ice cloud classes over the Indian summer monsoon region observed from 25-year AVHRR data

机译：从25年的AVHRR数据观察到，印度夏季风区域上的高不透明冰云类别的白天气候分布

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摘要

A daytime climatological spatio-temporal distribution of high opaque ice cloud (HOIC) classes over the Indian subcontinent (0-40° N, 60° E-100° E) is presented using 25-year data from the Advanced Very High Resolution Radiometers (AVHRRs) for the summer monsoon months. The HOICs are important for regional radiative balance, precipitation and troposphere- stratosphere exchange. In this study, HOICs are sub-divided into three classes based on their cloud top brightness temperatures (BT). Class I represents very deep convection (BT<220 K). Class II represents deep convection (220K<=BT<233 K) and Class III background convection (233K<=BT<253 K). Apart from presenting finest spatial resolution (0.1×0.1 degrees) and long-term climatology of such cloud classes from AVHRRs to date, this study for the first time illustrates on (1) how these three cloud classes are climatologically distributed during monsoon months, and (2) how their distribution changes during active and break monsoon conditions. It is also investigated that how many deep convective clouds reach the tropopause layer during individual monsoon months. It is seen that Class I and Class II clouds dominate the Indian subcontinent during monsoon. The movement of monsoon over continent is very well reflected in these cloud classes. During monsoon breaks strong suppression of convective activity is observed over the Arabian Sea and the western coast of India. On the other hand, the presence of such convective activity is crucial for active monsoon conditions and all-India rainfall. It is found that a significant fraction of HOICs (3-5%) reach the tropopause layer over the Bay of Bengal during June and over the north and northeast India during July and August. Many cases are observed when clouds penetrate the tropopause layer and reach the lower stratosphere. Such cases mostly occur during June compared to the other months.
机译：利用来自高级超高分辨率辐射计（25）的25年数据，显示了印度次大陆（0-40°N，60°E-100°E）上高不透明冰云（HOIC）类的白天气候时空分布。夏季季风月份）。 HOIC对于区域辐射平衡，降水和对流层-平流层交换非常重要。在这项研究中，HOIC根据其云顶亮度温度（BT）分为三类。 I类代表非常深的对流（BT <220 K）。 II类代表深对流（220K <= BT <233 K）和III类本底对流（233K <= BT <253 K）。除了提供迄今为止最好的空间分辨率（0.1×0.1度）和迄今为止从AVHRR到此类云的长期气候学外，本研究首次阐明（1）在季风月份这三种云的气候分布情况，以及（2）在活跃季风和断裂季风条件下它们的分布如何变化。还研究了在每个季风月份中有多少深对流云到达对流层顶层。可以看出，季风期间印度次大陆的I级和II级云占主导地位。这些云类很好地反映了季风在大陆上的运动。在季风爆发期间，在阿拉伯海和印度西海岸观察到对流活动的强烈抑制。另一方面，对流活动的存在对于活跃的季风条件和全印度降雨至关重要。发现在六月期间，很大一部分HOIC（3-5％）到达了孟加拉湾的对流层顶层，七月和八月期间到达了印度北部和东北部。当云穿透对流层顶层并到达平流层下部时，观察到许多情况。与其他月份相比，此类案件通常发生在6月。

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