Role of dynamics on the formation and maintenance of the elevated aerosol layer during monsoon season over south-east peninsular India

被引：40
|
作者：
Ratnam, M. Venkat [1 ]
Prasad, P. [2 ]
Raman, M. Roja [2 ]
Ravikiran, V. [1 ]
Rao, S. Vijaya Bhaskara [2 ]
Murthy, B. V. Krishna [3 ]
Jayaraman, A. [4 ]
机构：
[1] Natl Atmospher Res Lab, Gadanki, India
[2] SV Univ, Dept Phys, Tirupati, Andhra Pradesh, India
[3] CEBROS, B1, Chennai, Tamil Nadu, India
[4] Brigade Metropolis, J1407, Bangalore, Karnataka, India
来源：
ATMOSPHERIC ENVIRONMENT | 2018年 / 188卷
关键词：
Elevated aerosol layer; Lidar; Long-range transport; Vertical shear; GROUND-BASED LIDAR; VERTICAL-DISTRIBUTION; LOWER TROPOSPHERE; AIRBORNE LIDAR; CALIPSO LIDAR; VALIDATION; HYDERABAD; TRANSPORT; STATION; SURFACE;
D O I：
10.1016/j.atmosenv.2018.06.023
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The existence of elevated aerosol layer is common over India during monsoon season. Though its sources are well explained through long-range transport, its formation and maintenance is not explained to date. The formation and maintenances of an elevated aerosol layer, starting from similar to 2 km and extending up to similar to 5.5 km noticed is explained using two nearby lidars located in peninsular India. Existence of a cleaner environment with low aerosol loading below 2 km is attributed to the wet scavenging and existence of no strong local source. The low level jet (LLJ) from Arabian Sea persisting between 2 and 3 km is the main mechanism suggesting strong role of dynamics in the formation of these elevated layers. Persistent strong shears existing between LLJ and tropical easterly jet during this season restrict the up-liftment of aerosols to the higher altitudes. Observed features are explained in the light of dynamics, meteorology and long-range transport.
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页码：43 / 49
页数：7
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