Decadal variations in natural and anthropogenic aerosol optical depth over the Bay of Bengal: the influence of pollutants from Indo-GangeticPlain

被引:19
作者
Yadav, K. [1 ]
Rao, V. D. [2 ]
Sridevi, B. [1 ]
Sarma, V. V. S. S. [1 ,3 ]
机构
[1] CSIR Natl Inst Oceanog, 176 Lawsons Bay Colony, Visakhapatnam 530017, Andhra Pradesh, India
[2] ESSO Natl Ctr Coastal Res, Chennai, Tamil Nadu, India
[3] Acad Sci & Innovat Res, Panaji, Goa, India
基金
美国国家航空航天局;
关键词
Aerosol optical depth; Pollution; Long-term trends; Indo-Gangetic Plain; Bay of Bengal; OCEAN DIPOLE IOD; ARABIAN SEA; INDIAN-OCEAN; MARITIME AEROSOL; COASTAL BAY; MONSOON; TRENDS; LEVEL; MODIS; LAND;
D O I
10.1007/s11356-021-14703-x
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Perennial increase in atmospheric pollution over the Bay of Bengal (BoB) and South China Sea is reported due to increase in human population and industrial activity in South and Southeast Asia. Based on total aerosol optical depth (AOD) derived from MODIS (moderate resolution imaging resolution imaging spectroradiometer), natural and anthropogenic fractions were derived. The seasonality and spatial variability in rate of increase in total, natural, and anthropogenic AOD fractions were examined over the BoB using data collected between 2001 and 2019. Both total and anthropogenic AOD displayed statistically significant rate of increase in the northwest BoB (NWB) and western coastal BoB (WCB) regions during 2001 to 2019 whereas the long-term changes are insignificant in the other regions of BoB. Significant increase in AOD in the NWB and WCB regions is mainly contributed by dominant outflow of anthropogenic emissions from Indo-Gangetic Plain (IGP) area of Indian subcontinent. The magnitude of AOD decreased by half from northern BoB to equatorial region due to increase in distance from the source region. The contribution of anthropogenic AOD was >70% to total AOD with higher contribution during winter and lower during summer. The rate of increase in both total and anthropogenic AOD was close to 0.104 and 0.099 per decade in the NWB and 0.069 and 0.059 per decade in the WCB region between 2001 and 2019. The rate of increase in total and anthropogenic AOD decreased from 2001-2009 (0.164 and 0.115 per decade respectively) to 2010-2019 (0.068 and 0.076 per decade respectively) in the NWB region. Significant increase in anthropogenic AOD by 50 and 30% was observed during El Nino and La Nina periods respectively than normal year in both northwest BoB (NWB) and western coastal (WCB) regions due to change in strength and direction of winds. Although some fraction of anthropogenic AOD is found over the entire BoB, significant rate of increase in anthropogenic AOD is found only about 23% of the area of BoB than hitherto reported as entire BoB. The impact of atmospheric deposition of anthropogenic aerosols on biogeochemical processes, such as primary production and ocean acidification, needs further evaluation.
引用
收藏
页码:55202 / 55219
页数:18
相关论文
共 73 条
[1]  
[Anonymous], 2005, J GEOPHYS RES ATMOS, DOI DOI 10.1029/2003JD004436
[2]   Trends in aerosol optical depth over Indian region: Potential causes and impact indicators [J].
Babu, S. Suresh ;
Manoj, M. R. ;
Moorthy, K. Krishna ;
Gogoi, Mukunda M. ;
Nair, Vijayakumar S. ;
Kompalli, Sobhan Kumar ;
Satheesh, S. K. ;
Niranjan, K. ;
Ramagopal, K. ;
Bhuyan, P. K. ;
Singh, Darshan .
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2013, 118 (20) :11794-11806
[3]   Characteristics of spectral aerosol optical depths over India during ICARB [J].
Beegum, S. Naseema ;
Moorthy, K. Krishna ;
Nair, Vijayakumar S. ;
Babu, S. Suresh ;
Satheesh, S. K. ;
Vinoj, V. ;
Reddy, R. Ramakrishna ;
Gopal, K. Rama ;
Badarinath, K. V. S. ;
Niranjan, K. ;
Pandey, Santosh Kumar ;
Behera, M. ;
Jeyaram, A. ;
Bhuyan, P. K. ;
Gogoi, M. M. ;
Singh, Sacchidanand ;
Pant, P. ;
Dumka, U. C. ;
Kant, Yogesh ;
Kaniyal, J. C. ;
Singh, Darshan .
JOURNAL OF EARTH SYSTEM SCIENCE, 2008, 117 (Suppl 1) :303-313
[4]   CO2 induced growth response in a diatom dominated phytoplankton community from SW Bay of Bengal coastal water [J].
Biswas, Haimanti ;
Shaik, Aziz Ur Rahman ;
Bandyopadhyay, Debasmita ;
Chowdhury, Neha .
ESTUARINE COASTAL AND SHELF SCIENCE, 2017, 198 :29-42
[5]   Enhanced abundance of tintinnids under elevated CO2 level from coastal Bay of Bengal [J].
Biswas, Haimanti ;
Gadi, Subhadra Devi ;
Ramana, V. Venkata ;
Bharathi, M. Durga ;
Priyan, R. Kesava ;
Manjari, D. Taruni ;
Kumar, M. Dileep .
BIODIVERSITY AND CONSERVATION, 2012, 21 (05) :1309-1326
[6]   The response of a natural phytoplankton community from the Godavari River Estuary to increasing CO2 concentration during the pre-monsoon period [J].
Biswas, Haimanti ;
Cros, Alexander ;
Yadav, Kamana ;
Ramana, V. Venkata ;
Prasad, V. Rajendra ;
Acharyya, Tamoghna ;
Babu, P. V. Raghunadh .
JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY, 2011, 407 (02) :284-293
[7]   Large contribution of meteorological factors to inter-decadal changes in regional aerosol optical depth [J].
Che, Huizheng ;
Gui, Ke ;
Xia, Xiangao ;
Wang, Yaqiang ;
Holben, Brent N. ;
Goloub, Philippe ;
Cuevas-Agullo, Emilio ;
Wang, Hong ;
Zheng, Yu ;
Zhao, Hujia ;
Zhang, Xiaoye .
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2019, 19 (16) :10497-10523
[8]   Quantifying the occurrence and magnitude of the Southeast Asian fire climatology [J].
Cohen, Jason Blake .
ENVIRONMENTAL RESEARCH LETTERS, 2014, 9 (11)
[9]   Long-range transportation of anthropogenic aerosols over eastern coastal region of India: Investigation of sources and impact on regional climate change [J].
Das, S. K. ;
Jayaraman, A. .
ATMOSPHERIC RESEARCH, 2012, 118 :68-83
[10]   Near-Future Anthropogenic Aerosol Emission Scenarios and Their Direct Radiative Effects on the Present-Day Characteristics of the Indian Summer Monsoon [J].
Das, Sushant ;
Giorgi, Filippo ;
Giuliani, Graziano ;
Dey, Sagnik ;
Coppola, Erika .
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (04)