Atmospheric bromoform at Cape Point, South Africa: an initial fixed-point data set on the African continent

Bromoform mixing ratios in marine air were measured at Cape Point Global Atmospheric Watch Station, South Africa. This represents the first such bromoform data set recorded at this location. Manual daily measurements were made during a month-long field campaign (austral spring 2011) using a gas...

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Main Authors:	B. Kuyper, C. J. Palmer, C. Labuschagne, C. J. C. Reason
Format:	Article
Language:	English
Published:	Copernicus Publications 2018-04-01
Series:	Atmospheric Chemistry and Physics
Online Access:	https://www.atmos-chem-phys.net/18/5785/2018/acp-18-5785-2018.pdf

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spelling	doaj-18f6e29202d1450d963946607e2717542020-11-25T00:24:14ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242018-04-01185785579710.5194/acp-18-5785-2018Atmospheric bromoform at Cape Point, South Africa: an initial fixed-point data set on the African continentB. Kuyper0B. Kuyper1C. J. Palmer2C. J. Palmer3C. Labuschagne4C. J. C. Reason5Department of Oceanography, University of Cape Town, Cape Town, South Africanow at: Department of Chemistry, University of the Western Cape, Cape Town, South AfricaDepartment of Oceanography, University of Cape Town, Cape Town, South AfricaApplied Centre for Climate and Earth System Science, CSIR, Rosebank, South AfricaSouth African Weather Service, Stellenbosch, South AfricaDepartment of Oceanography, University of Cape Town, Cape Town, South AfricaBromoform mixing ratios in marine air were measured at Cape Point Global Atmospheric Watch Station, South Africa. This represents the first such bromoform data set recorded at this location. Manual daily measurements were made during a month-long field campaign (austral spring 2011) using a gas chromatograph-electron capture detector (GC-ECD) with a custom-built front end thermal desorption trap. The measured concentrations ranged between 4.4 and 64.6 (± 22.2 %) ppt with a mean of 24.8 ± 14.8 ppt. The highest mixing ratios recorded here occurred at, or shortly after, low tide. The diurnal cycle exhibited a morning and evening maximum with lower concentrations throughout the rest of the day. Initial analysis of the data presented indicates that the local kelp beds were the dominant source of the bromoform reported. A concentration-weighted trajectory analysis of the bromoform measurements suggests that two offshore source areas may exist. These source areas appear to be centred on the Agulhas retroflection and extend from St Helena Bay to the southwest.https://www.atmos-chem-phys.net/18/5785/2018/acp-18-5785-2018.pdf
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	B. Kuyper B. Kuyper C. J. Palmer C. J. Palmer C. Labuschagne C. J. C. Reason
spellingShingle	B. Kuyper B. Kuyper C. J. Palmer C. J. Palmer C. Labuschagne C. J. C. Reason Atmospheric bromoform at Cape Point, South Africa: an initial fixed-point data set on the African continent Atmospheric Chemistry and Physics
author_facet	B. Kuyper B. Kuyper C. J. Palmer C. J. Palmer C. Labuschagne C. J. C. Reason
author_sort	B. Kuyper
title	Atmospheric bromoform at Cape Point, South Africa: an initial fixed-point data set on the African continent
title_short	Atmospheric bromoform at Cape Point, South Africa: an initial fixed-point data set on the African continent
title_full	Atmospheric bromoform at Cape Point, South Africa: an initial fixed-point data set on the African continent
title_fullStr	Atmospheric bromoform at Cape Point, South Africa: an initial fixed-point data set on the African continent
title_full_unstemmed	Atmospheric bromoform at Cape Point, South Africa: an initial fixed-point data set on the African continent
title_sort	atmospheric bromoform at cape point, south africa: an initial fixed-point data set on the african continent
publisher	Copernicus Publications
series	Atmospheric Chemistry and Physics
issn	1680-7316 1680-7324
publishDate	2018-04-01
description	Bromoform mixing ratios in marine air were measured at Cape Point Global Atmospheric Watch Station, South Africa. This represents the first such bromoform data set recorded at this location. Manual daily measurements were made during a month-long field campaign (austral spring 2011) using a gas chromatograph-electron capture detector (GC-ECD) with a custom-built front end thermal desorption trap. The measured concentrations ranged between 4.4 and 64.6 (± 22.2 %) ppt with a mean of 24.8 ± 14.8 ppt. The highest mixing ratios recorded here occurred at, or shortly after, low tide. The diurnal cycle exhibited a morning and evening maximum with lower concentrations throughout the rest of the day. Initial analysis of the data presented indicates that the local kelp beds were the dominant source of the bromoform reported. A concentration-weighted trajectory analysis of the bromoform measurements suggests that two offshore source areas may exist. These source areas appear to be centred on the Agulhas retroflection and extend from St Helena Bay to the southwest.
url	https://www.atmos-chem-phys.net/18/5785/2018/acp-18-5785-2018.pdf
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Atmospheric bromoform at Cape Point, South Africa: an initial fixed-point data set on the African continent

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