Role of dynamics in the advection of aerosols over the Arabian Sea along the west coast of peninsular India during pre-monsoon season: A case study based on satellite data and regional climate model |
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| Authors: | Marina Aloysius S Sijikumar S S Prijith Mannil Mohan K Parameswaran |
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| Institution: | 1.Space Physics Laboratory,Vikram Sarabhai Space Centre,Thiruvananthapuram,India |
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| Abstract: | The circulation dynamics of an event marked by the formation of an aerosol cluster off the coast of Maharashtra on April 22,
2006, its southward migration along the Indian west coast with a mean speed of ~200 km/day and its final dissipation after
reaching the end of the peninsula by April 28, 2006 as revealed by MODIS (Moderate Resolution Imaging Spectroradiometer) against
the pre-monsoon conditions of April 2006 are examined in this study. The maximum aerosol concentration in the cluster was
found getting confined to lower and lower altitudes during its southward movement. The NCEP/NCAR (National Centers for Environmental
Prediction/National Center for Atmospheric Research) reanalysis wind field indicates that the atmospheric circulation, especially
the horizontal wind convergence is the major factor that guides the formation and the dynamics of the cluster. Fine mode fraction
from MODIS suggests that the cluster mainly consists of coarse dust particles. The regional climate model, RegCM3 with an
efficient dust generation module simulates the formation and movement of the cluster appreciably well. The simulations which
also exhibit the altitudinally descending nature of the cluster during its southward movement confirm the mechanism which
governs the cluster dynamics suggested based on MODIS and NCEP/NCAR reanalysis data. |
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