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Tethered Balloon-borne Aerosol Measurements: Seasonal and Vertical Variations of Aerosol Constituents Over Syowa Station, Antarctica : Volume 13, Issue 17 (10/09/2013)

By Hara, K.

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Book Id: WPLBN0003989518
Format Type: PDF Article :
File Size: Pages 21
Reproduction Date: 2015

Title: Tethered Balloon-borne Aerosol Measurements: Seasonal and Vertical Variations of Aerosol Constituents Over Syowa Station, Antarctica : Volume 13, Issue 17 (10/09/2013)  
Author: Hara, K.
Volume: Vol. 13, Issue 17
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2013
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Osada, K., Yamanouchi, T., & Hara, K. (2013). Tethered Balloon-borne Aerosol Measurements: Seasonal and Vertical Variations of Aerosol Constituents Over Syowa Station, Antarctica : Volume 13, Issue 17 (10/09/2013). Retrieved from http://worldlibrary.net/


Description
Description: National Institute of Polar Research, Tokyo, Japan. Tethered balloon-borne aerosol measurements were conducted at Syowa Station, Antarctica, during the 46th Japanese Antarctic expedition (2005–2006). Direct aerosol sampling was operated from near the surface to the lower free troposphere (approximately 2500 m) using a balloon-borne aerosol impactor. Individual aerosol particles were analyzed using a scanning electron microscope equipped with an energy dispersive X-ray spectrometer. Seasonal and vertical features of aerosol constituents and their mixing states were investigated. Results show that sulfate particles were predominant in the boundary layer and lower free troposphere in summer, whereas sea-salt particles were predominant during winter through spring. Minerals, MgSO4, and sulfate containing K were identified as minor aerosol constituents in both boundary layer and free troposphere over Syowa Station. Although sea-salt particles were predominant during winter through spring, the relative abundance of sulfate particles increased in the boundary layer when air masses fell from the free troposphere over the Antarctic coast and continent. Sea-salt particles were modified considerably through heterogeneous reactions with SO42− CH3SO3 and their precursors during summer, and were modified slightly through heterogeneous reactions with NO3 and its precursors. During winter through spring, sea-salt modification was insignificant, particularly in the cases of high relative abundance of sea-salt particles and higher number concentrations. In August, NO3 and its precursors contributed greatly to sea-salt modification over Syowa Station. Because of the occurrence of sea-salt fractionation on sea ice, Mg-rich sea-salt particles were identified during the months of April through November. In contrast, Mg-free sea-salt particles and slightly Mg-rich sea-salt particles coexisted in the lower troposphere during summer. Thereby, Mg separation can proceed by sea-salt fractionation during summer in Antarctic regions.

Summary
Tethered balloon-borne aerosol measurements: seasonal and vertical variations of aerosol constituents over Syowa Station, Antarctica

Excerpt
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