Influence of continental advection on aerosol characteristics over Bay of Bengal (BoB) in winter: results from W-ICARB cruise experiment
The transport of aerosols and pollutants from continental India to the adjoining oceanic areas is a major topic of concern and several experimental campaigns have been conducted over the region focusing on aerosol characteristics and their climate implications. The present study analyzes the spe...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2011-08-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/29/1423/2011/angeo-29-1423-2011.pdf |
| _version_ | 1811259098536083456 |
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| author | S. K. Kharol S. K. Kharol K. V. S. Badarinath D. G. Kaskaoutis A. R. Sharma B. Gharai |
| author_facet | S. K. Kharol S. K. Kharol K. V. S. Badarinath D. G. Kaskaoutis A. R. Sharma B. Gharai |
| author_sort | S. K. Kharol |
| collection | DOAJ |
| description | The transport of aerosols and pollutants from continental India to the
adjoining oceanic areas is a major topic of concern and several experimental
campaigns have been conducted over the region focusing on aerosol
characteristics and their climate implications. The present study analyzes
the spectral aerosol optical depth (AOD) variations over Bay of Bengal (BoB)
during Winter-Integrated Campaign for Aerosols, gases and Radiation Budget
(W-ICARB) from 27 December 2008 to 30 January 2009 and
investigates the influence of the adjoining landmass to the marine aerosol
field. High AOD<sub>500</sub> values (>0.7) occurred over northern BoB due to
outflow of aerosols and pollutants from the densely populated Indo-Gangetic
Plains (IGP); low AOD<sub>500</sub> (0.1–0.2) was observed in central and southern
BoB, far away from the mainland. The Angstrom exponent "α" was observed
to be high (>1.2) near coastal waters, indicating relative abundance of
accumulation-mode continental aerosols. On the other hand, over southern BoB
its values dropped below ~0.7. National Center for Environmental
Prediction (NCEP) reanalysis data on winds at 850 and 700 hPa, along with
air-mass trajectories calculated using Hybrid Single Particle Lagrangian
Integrated Trajectory (HYSPLIT) model, suggested transport of continental
aerosols from central and northern India over the BoB. On the other
hand, when the ship was crossing the eastern BoB, the aerosol loading was
strongly affected by air-masses originating from Southeast Asia, causing an
increase in AOD and α. Biomass-burning episodes over the region
played an important role in the observed aerosol properties. Terra/Aqua
Moderate Resolution Imaging Spectroradiometer (MODIS) AOD<sub>550</sub> and cruise
measured AOD<sub>550</sub> showed good agreement (<I>R</I><sup>2</sup> = 0.86 and 0.77,
respectively) over BoB, exhibiting similar AOD and α spatio-temporal
variation. |
| first_indexed | 2024-04-12T18:24:15Z |
| format | Article |
| id | doaj.art-38a9ef889a8e4b36a70db264b48e88fd |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-04-12T18:24:15Z |
| publishDate | 2011-08-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-38a9ef889a8e4b36a70db264b48e88fd2022-12-22T03:21:17ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762011-08-01291423143810.5194/angeo-29-1423-2011Influence of continental advection on aerosol characteristics over Bay of Bengal (BoB) in winter: results from W-ICARB cruise experimentS. K. Kharol0S. K. Kharol1K. V. S. Badarinath2D. G. Kaskaoutis3A. R. Sharma4B. Gharai5Atmospheric Science Section, National Remote Sensing Centre, Dept. of Space-Govt. of India, Balanagar, Hyderabad – 500 625, IndiaDepartment of Physics and Atmospheric Science, Dalhousie University, Halifax, CanadaAtmospheric Science Section, National Remote Sensing Centre, Dept. of Space-Govt. of India, Balanagar, Hyderabad – 500 625, IndiaResearch and Technology Development Centre, Sharda University, Greater Noida, NCR – 201 306, IndiaAtmospheric Science Section, National Remote Sensing Centre, Dept. of Space-Govt. of India, Balanagar, Hyderabad – 500 625, IndiaAtmospheric Science Section, National Remote Sensing Centre, Dept. of Space-Govt. of India, Balanagar, Hyderabad – 500 625, IndiaThe transport of aerosols and pollutants from continental India to the adjoining oceanic areas is a major topic of concern and several experimental campaigns have been conducted over the region focusing on aerosol characteristics and their climate implications. The present study analyzes the spectral aerosol optical depth (AOD) variations over Bay of Bengal (BoB) during Winter-Integrated Campaign for Aerosols, gases and Radiation Budget (W-ICARB) from 27 December 2008 to 30 January 2009 and investigates the influence of the adjoining landmass to the marine aerosol field. High AOD<sub>500</sub> values (>0.7) occurred over northern BoB due to outflow of aerosols and pollutants from the densely populated Indo-Gangetic Plains (IGP); low AOD<sub>500</sub> (0.1–0.2) was observed in central and southern BoB, far away from the mainland. The Angstrom exponent "α" was observed to be high (>1.2) near coastal waters, indicating relative abundance of accumulation-mode continental aerosols. On the other hand, over southern BoB its values dropped below ~0.7. National Center for Environmental Prediction (NCEP) reanalysis data on winds at 850 and 700 hPa, along with air-mass trajectories calculated using Hybrid Single Particle Lagrangian Integrated Trajectory (HYSPLIT) model, suggested transport of continental aerosols from central and northern India over the BoB. On the other hand, when the ship was crossing the eastern BoB, the aerosol loading was strongly affected by air-masses originating from Southeast Asia, causing an increase in AOD and α. Biomass-burning episodes over the region played an important role in the observed aerosol properties. Terra/Aqua Moderate Resolution Imaging Spectroradiometer (MODIS) AOD<sub>550</sub> and cruise measured AOD<sub>550</sub> showed good agreement (<I>R</I><sup>2</sup> = 0.86 and 0.77, respectively) over BoB, exhibiting similar AOD and α spatio-temporal variation.https://www.ann-geophys.net/29/1423/2011/angeo-29-1423-2011.pdf |
| spellingShingle | S. K. Kharol S. K. Kharol K. V. S. Badarinath D. G. Kaskaoutis A. R. Sharma B. Gharai Influence of continental advection on aerosol characteristics over Bay of Bengal (BoB) in winter: results from W-ICARB cruise experiment Annales Geophysicae |
| title | Influence of continental advection on aerosol characteristics over Bay of Bengal (BoB) in winter: results from W-ICARB cruise experiment |
| title_full | Influence of continental advection on aerosol characteristics over Bay of Bengal (BoB) in winter: results from W-ICARB cruise experiment |
| title_fullStr | Influence of continental advection on aerosol characteristics over Bay of Bengal (BoB) in winter: results from W-ICARB cruise experiment |
| title_full_unstemmed | Influence of continental advection on aerosol characteristics over Bay of Bengal (BoB) in winter: results from W-ICARB cruise experiment |
| title_short | Influence of continental advection on aerosol characteristics over Bay of Bengal (BoB) in winter: results from W-ICARB cruise experiment |
| title_sort | influence of continental advection on aerosol characteristics over bay of bengal bob in winter results from w icarb cruise experiment |
| url | https://www.ann-geophys.net/29/1423/2011/angeo-29-1423-2011.pdf |
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