Spatiotemporal variations in aerosol characteristics along the route of the Indian-Atlantic expedition onboard the research vessel Akademik Nikolaj Strakhov

Spatiotemporal variations in aerosol characteristics along the route of the Indian-Atlantic... We discuss the results of studying the physical-chemical composition of the atmospheric aerosol during expedition onboard the RV Akademik Nikolaj Strakhov carried out during winter of 2015–2016 on the route from Colombo to Kaliningrad (via Suez Canal). As compared to the Mediterranean Sea and Atlantic (near Europe), the atmosphere of the Arabian and Red Seas was characterized by higher values of most aerosol characteristics: 3–5 times larger aerosol optical depth (AOD), 4 times larger aerosol number concentration, 1.5 times larger concentrations of continent- and sea-derived ions, as well as more abundant gas admixtures (SO2, HCl, HNO3, NH3). At the same time, two seas of the Indian basin substantially differ in aerosol composition, primarily due to outflows of aerosols of different types from the continents. The largest concentrations of black carbon (2.14 μg m–3, on average), sea-derived ions (Na+, Cl–, Mg2+), and NH3 are observed over the Arabian Sea; larger values of the fine component of the AOD and concentrations of “continental” ions (SO4 2-, Ca2+, NO3 -, NH4 +) and gas admixtures SO2, HCl, HNO3 are found over the Red Sea. With respect to ion composition of aerosol, most stable concentrations are noted for Ca2+ ions (less than 15% difference among the seas), and maximal spatial variations are found for NH 4 + ions (the difference of up to a factor of 40). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Atmospheric and Oceanic Optics Springer Journals

Spatiotemporal variations in aerosol characteristics along the route of the Indian-Atlantic expedition onboard the research vessel Akademik Nikolaj Strakhov

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Publisher
Pleiades Publishing
Copyright
Copyright © 2017 by Pleiades Publishing, Ltd.
Subject
Physics; Optics, Lasers, Photonics, Optical Devices
ISSN
1024-8560
eISSN
2070-0393
D.O.I.
10.1134/S1024856017040108
Publisher site
See Article on Publisher Site

Abstract

We discuss the results of studying the physical-chemical composition of the atmospheric aerosol during expedition onboard the RV Akademik Nikolaj Strakhov carried out during winter of 2015–2016 on the route from Colombo to Kaliningrad (via Suez Canal). As compared to the Mediterranean Sea and Atlantic (near Europe), the atmosphere of the Arabian and Red Seas was characterized by higher values of most aerosol characteristics: 3–5 times larger aerosol optical depth (AOD), 4 times larger aerosol number concentration, 1.5 times larger concentrations of continent- and sea-derived ions, as well as more abundant gas admixtures (SO2, HCl, HNO3, NH3). At the same time, two seas of the Indian basin substantially differ in aerosol composition, primarily due to outflows of aerosols of different types from the continents. The largest concentrations of black carbon (2.14 μg m–3, on average), sea-derived ions (Na+, Cl–, Mg2+), and NH3 are observed over the Arabian Sea; larger values of the fine component of the AOD and concentrations of “continental” ions (SO4 2-, Ca2+, NO3 -, NH4 +) and gas admixtures SO2, HCl, HNO3 are found over the Red Sea. With respect to ion composition of aerosol, most stable concentrations are noted for Ca2+ ions (less than 15% difference among the seas), and maximal spatial variations are found for NH 4 + ions (the difference of up to a factor of 40).

Journal

Atmospheric and Oceanic OpticsSpringer Journals

Published: Aug 24, 2017

References

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