Bromocarbons in the tropical coastal and open ocean atmosphere during the 2009 Prime Expedition Scientific Cruise (PESC-09)

Mohd Shahrul Mohd Nadzir, S. M. Phang, M. R. Abas, N. Abdul Rahman, A. Abu Samah, W. T. Sturges, D. E. Oram, G. P. Mills, E. C. Leedham, J. A. Pyle, N. R P Harris, A. D. Robinson, M. J. Ashfold, M. I. Mead, Mohd Talib Latif, Firoz Khan, A. M. Amiruddin, N. Banan, Marlia Mohd Hanafiah

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Abstract

Atmospheric concentrations of very short-lived species (VSLS) bromocarbons, including CHBr3, CH2Br2, CHCl2Br, CHClBr2, and CH2BrCl, were measured in the Strait of Malacca and the South China and Sulu-Sulawesi seas during a two-month research cruise in June-July 2009. The highest bromocarbon concentrations were found in the Strait of Malacca, with smaller enhancements in coastal regions of northern Borneo. CHBr3 was the most abundant bromocarbon, ranging from 5.2 pmol mol<sup>-1</sup> in the Strait of Malacca to 0.94 pmol mol<sup>-1</sup> over the open ocean. Other bromocarbons showed lower concentrations, in the range of 0.8-1.3 pmol mol<sup>-1</sup> for CH2Br2, 0.1-0.5 pmol mol<sup>-1</sup> for CHCl2Br, and 0.1-0.4 pmol mol<sup>-1</sup> for CHClBr2. There was no significant correlation between bromocarbons and in situ chlorophyll, but positive correlations with both MODIS and SeaWiFS satellite chlorophyll. Together, the short-lived bromocarbons contribute an average of 8.9 pmol mol<sup>-1</sup> (range 5.2-21.4 pmol mol<sup>-1</sup>) to tropospheric bromine loading, which is similar to that found in previous studies from global sampling networks (Montzka et al., 2011). Statistical tests showed strong Spearman correlations between brominated compounds, suggesting a common source. Log-log plots of CHBr3/CH2Br2 versus CHBr2Cl/CH2Br2 show that both chemical reactions and dilution into the background atmosphere contribute to the composition of these halocarbons at each sampling point. We have used the correlation to make a crude estimate of the regional emissions of CHBr3 and to derive a value of 32 Gg yrĝ̂'1 for the Southeast (SE) Asian region (10° N-20° S, 90-150° E). Finally, we note that satellite-derived chlorophyll (chl ) products do not always agree well with in situ measurements, particularly in coastal regions of high turbidity, meaning that satellite chl may not always be a good proxy for marine productivity.

Original languageEnglish
Pages (from-to)8137-8148
Number of pages12
JournalAtmospheric Chemistry and Physics
Volume14
Issue number15
DOIs
Publication statusPublished - 14 Aug 2014

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open ocean
chlorophyll
strait
atmosphere
halocarbon
SeaWiFS
bromine
sampling
chemical reaction
in situ measurement
MODIS
turbidity
dilution
productivity

ASJC Scopus subject areas

  • Atmospheric Science

Cite this

Bromocarbons in the tropical coastal and open ocean atmosphere during the 2009 Prime Expedition Scientific Cruise (PESC-09). / Mohd Nadzir, Mohd Shahrul; Phang, S. M.; Abas, M. R.; Abdul Rahman, N.; Abu Samah, A.; Sturges, W. T.; Oram, D. E.; Mills, G. P.; Leedham, E. C.; Pyle, J. A.; Harris, N. R P; Robinson, A. D.; Ashfold, M. J.; Mead, M. I.; Latif, Mohd Talib; Khan, Firoz; Amiruddin, A. M.; Banan, N.; Mohd Hanafiah, Marlia.

In: Atmospheric Chemistry and Physics, Vol. 14, No. 15, 14.08.2014, p. 8137-8148.

Research output: Contribution to journalArticle

Mohd Nadzir, MS, Phang, SM, Abas, MR, Abdul Rahman, N, Abu Samah, A, Sturges, WT, Oram, DE, Mills, GP, Leedham, EC, Pyle, JA, Harris, NRP, Robinson, AD, Ashfold, MJ, Mead, MI, Latif, MT, Khan, F, Amiruddin, AM, Banan, N & Mohd Hanafiah, M 2014, 'Bromocarbons in the tropical coastal and open ocean atmosphere during the 2009 Prime Expedition Scientific Cruise (PESC-09)', Atmospheric Chemistry and Physics, vol. 14, no. 15, pp. 8137-8148. https://doi.org/10.5194/acp-14-8137-2014
Mohd Nadzir, Mohd Shahrul ; Phang, S. M. ; Abas, M. R. ; Abdul Rahman, N. ; Abu Samah, A. ; Sturges, W. T. ; Oram, D. E. ; Mills, G. P. ; Leedham, E. C. ; Pyle, J. A. ; Harris, N. R P ; Robinson, A. D. ; Ashfold, M. J. ; Mead, M. I. ; Latif, Mohd Talib ; Khan, Firoz ; Amiruddin, A. M. ; Banan, N. ; Mohd Hanafiah, Marlia. / Bromocarbons in the tropical coastal and open ocean atmosphere during the 2009 Prime Expedition Scientific Cruise (PESC-09). In: Atmospheric Chemistry and Physics. 2014 ; Vol. 14, No. 15. pp. 8137-8148.
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abstract = "Atmospheric concentrations of very short-lived species (VSLS) bromocarbons, including CHBr3, CH2Br2, CHCl2Br, CHClBr2, and CH2BrCl, were measured in the Strait of Malacca and the South China and Sulu-Sulawesi seas during a two-month research cruise in June-July 2009. The highest bromocarbon concentrations were found in the Strait of Malacca, with smaller enhancements in coastal regions of northern Borneo. CHBr3 was the most abundant bromocarbon, ranging from 5.2 pmol mol-1 in the Strait of Malacca to 0.94 pmol mol-1 over the open ocean. Other bromocarbons showed lower concentrations, in the range of 0.8-1.3 pmol mol-1 for CH2Br2, 0.1-0.5 pmol mol-1 for CHCl2Br, and 0.1-0.4 pmol mol-1 for CHClBr2. There was no significant correlation between bromocarbons and in situ chlorophyll, but positive correlations with both MODIS and SeaWiFS satellite chlorophyll. Together, the short-lived bromocarbons contribute an average of 8.9 pmol mol-1 (range 5.2-21.4 pmol mol-1) to tropospheric bromine loading, which is similar to that found in previous studies from global sampling networks (Montzka et al., 2011). Statistical tests showed strong Spearman correlations between brominated compounds, suggesting a common source. Log-log plots of CHBr3/CH2Br2 versus CHBr2Cl/CH2Br2 show that both chemical reactions and dilution into the background atmosphere contribute to the composition of these halocarbons at each sampling point. We have used the correlation to make a crude estimate of the regional emissions of CHBr3 and to derive a value of 32 Gg yrĝ̂'1 for the Southeast (SE) Asian region (10° N-20° S, 90-150° E). Finally, we note that satellite-derived chlorophyll (chl ) products do not always agree well with in situ measurements, particularly in coastal regions of high turbidity, meaning that satellite chl may not always be a good proxy for marine productivity.",
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T1 - Bromocarbons in the tropical coastal and open ocean atmosphere during the 2009 Prime Expedition Scientific Cruise (PESC-09)

AU - Mohd Nadzir, Mohd Shahrul

AU - Phang, S. M.

AU - Abas, M. R.

AU - Abdul Rahman, N.

AU - Abu Samah, A.

AU - Sturges, W. T.

AU - Oram, D. E.

AU - Mills, G. P.

AU - Leedham, E. C.

AU - Pyle, J. A.

AU - Harris, N. R P

AU - Robinson, A. D.

AU - Ashfold, M. J.

AU - Mead, M. I.

AU - Latif, Mohd Talib

AU - Khan, Firoz

AU - Amiruddin, A. M.

AU - Banan, N.

AU - Mohd Hanafiah, Marlia

PY - 2014/8/14

Y1 - 2014/8/14

N2 - Atmospheric concentrations of very short-lived species (VSLS) bromocarbons, including CHBr3, CH2Br2, CHCl2Br, CHClBr2, and CH2BrCl, were measured in the Strait of Malacca and the South China and Sulu-Sulawesi seas during a two-month research cruise in June-July 2009. The highest bromocarbon concentrations were found in the Strait of Malacca, with smaller enhancements in coastal regions of northern Borneo. CHBr3 was the most abundant bromocarbon, ranging from 5.2 pmol mol-1 in the Strait of Malacca to 0.94 pmol mol-1 over the open ocean. Other bromocarbons showed lower concentrations, in the range of 0.8-1.3 pmol mol-1 for CH2Br2, 0.1-0.5 pmol mol-1 for CHCl2Br, and 0.1-0.4 pmol mol-1 for CHClBr2. There was no significant correlation between bromocarbons and in situ chlorophyll, but positive correlations with both MODIS and SeaWiFS satellite chlorophyll. Together, the short-lived bromocarbons contribute an average of 8.9 pmol mol-1 (range 5.2-21.4 pmol mol-1) to tropospheric bromine loading, which is similar to that found in previous studies from global sampling networks (Montzka et al., 2011). Statistical tests showed strong Spearman correlations between brominated compounds, suggesting a common source. Log-log plots of CHBr3/CH2Br2 versus CHBr2Cl/CH2Br2 show that both chemical reactions and dilution into the background atmosphere contribute to the composition of these halocarbons at each sampling point. We have used the correlation to make a crude estimate of the regional emissions of CHBr3 and to derive a value of 32 Gg yrĝ̂'1 for the Southeast (SE) Asian region (10° N-20° S, 90-150° E). Finally, we note that satellite-derived chlorophyll (chl ) products do not always agree well with in situ measurements, particularly in coastal regions of high turbidity, meaning that satellite chl may not always be a good proxy for marine productivity.

AB - Atmospheric concentrations of very short-lived species (VSLS) bromocarbons, including CHBr3, CH2Br2, CHCl2Br, CHClBr2, and CH2BrCl, were measured in the Strait of Malacca and the South China and Sulu-Sulawesi seas during a two-month research cruise in June-July 2009. The highest bromocarbon concentrations were found in the Strait of Malacca, with smaller enhancements in coastal regions of northern Borneo. CHBr3 was the most abundant bromocarbon, ranging from 5.2 pmol mol-1 in the Strait of Malacca to 0.94 pmol mol-1 over the open ocean. Other bromocarbons showed lower concentrations, in the range of 0.8-1.3 pmol mol-1 for CH2Br2, 0.1-0.5 pmol mol-1 for CHCl2Br, and 0.1-0.4 pmol mol-1 for CHClBr2. There was no significant correlation between bromocarbons and in situ chlorophyll, but positive correlations with both MODIS and SeaWiFS satellite chlorophyll. Together, the short-lived bromocarbons contribute an average of 8.9 pmol mol-1 (range 5.2-21.4 pmol mol-1) to tropospheric bromine loading, which is similar to that found in previous studies from global sampling networks (Montzka et al., 2011). Statistical tests showed strong Spearman correlations between brominated compounds, suggesting a common source. Log-log plots of CHBr3/CH2Br2 versus CHBr2Cl/CH2Br2 show that both chemical reactions and dilution into the background atmosphere contribute to the composition of these halocarbons at each sampling point. We have used the correlation to make a crude estimate of the regional emissions of CHBr3 and to derive a value of 32 Gg yrĝ̂'1 for the Southeast (SE) Asian region (10° N-20° S, 90-150° E). Finally, we note that satellite-derived chlorophyll (chl ) products do not always agree well with in situ measurements, particularly in coastal regions of high turbidity, meaning that satellite chl may not always be a good proxy for marine productivity.

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