Absorbing aerosol variability over the Indian subcontinent and its increasing dependence on ENSO

被引:27
作者
Abish, B. [1 ]
Mohanakumar, K. [1 ]
机构
[1] Cochin Univ Sci & Technol, Dept Atmospher Sci, Cochin 682016, Kerala, India
关键词
Aerosol index; zonal circulation; Oceanic Nino index; BLACK CARBON AEROSOLS; INTERANNUAL VARIABILITY; OPTICAL DEPTH; DUST AEROSOLS; CIRCULATION; RAINFALL; ULTRAVIOLET; CLIMATE; REGION; MODEL;
D O I
10.1016/j.gloplacha.2013.02.007
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
In this study, the influence of the El Nino Southern Oscillation (ENSO) on the transport, deposition and distribution of absorbing aerosols over the Indian subcontinent during a period of 30 years (1982 to 2011) is investigated. The analysis reveals that the changes in the zonal circulation over the tropics have a significant effect on the aerosol loading over the Indian region. This interannual variability in aerosol concentration arises due to its increasing dependence on the development of sea surface temperature (SST) anomalies over the tropical Pacific Ocean. Significant statistical correlations in SST anomalies confirm this relationship. During El Nino conditions, warm SST anomalies cause the zonal circulation to become pronounced with well-defined areas of rising and sinking motion along a mean air flow driven by convection at the west (the Arabian Peninsula), and subsidence to the east (Indian subcontinent). These intense westerlies at 700 hPa altitude transport large quantities of aerosols from the Arabian Peninsula towards the east and deposit them over the Indian subcontinent. However, a weaker and less organised zonal circulation system associated with cold SST anomalies suppresses the aerosol loading during the La Nina phase. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码:13 / 19
页数:7
相关论文
共 49 条
[1]   A stochastic model for predicting aerosol optical depth over the north Indian region [J].
Abish, B. ;
Mohanakumar, K. .
INTERNATIONAL JOURNAL OF REMOTE SENSING, 2013, 34 (04) :1449-1458
[2]   Biennial variability in aerosol optical depth associated with QBO modulated tropical tropopause [J].
Abish, B. ;
Mohanakumar, K. .
ATMOSPHERIC SCIENCE LETTERS, 2012, 13 (01) :61-66
[3]   Role of fine mode aerosols in modulating cloud properties over industrial locations in north India [J].
Abish, B. ;
Mohanakumar, K. .
ANNALES GEOPHYSICAE, 2011, 29 (09) :1605-1612
[4]  
[Anonymous], 1932, Mem. Roy. Meteor. Soc.
[5]  
[Anonymous], GEOPHYS RES LETT
[6]  
[Anonymous], 1990, El Nino, La Nina, and the Southern Oscillation
[7]   Impact of the Indian Ocean Dipole on the relationship between the Indian monsoon rainfall and ENSO [J].
Ashok, K ;
Guan, ZY ;
Yamagata, T .
GEOPHYSICAL RESEARCH LETTERS, 2001, 28 (23) :4499-4502
[8]   Long-range transport of dust aerosols over the Arabian Sea and Indian region A case study using satellite data and ground-based measurements [J].
Badarinath, K. V. S. ;
Kharol, Shailesh Kumar ;
Kaskaoutis, D. G. ;
Sharma, Anu Rani ;
Ramaswamy, V. ;
Kambezidis, H. D. .
GLOBAL AND PLANETARY CHANGE, 2010, 72 (03) :164-181
[9]  
BJERKNES J, 1969, MON WEATHER REV, V97, P163, DOI 10.1175/1520-0493(1969)097<0163:ATFTEP>2.3.CO
[10]  
2