In:
Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 115, No. C10 ( 2010-10)
Abstract:
The partial pressures of methyl halides (CH 3 X; X = Cl, Br, or I) and of CHClF 2 (HCFC‐22), which are all volatile organic compounds (VOCs), were measured in the air of the marine boundary layer ( p VOC air ) and in surface seawater ( p VOC water ) during a cruise from the subarctic to subtropical regions of the northwest Pacific in summer of 2008. In the northern transition water (TW N ) with high biological activity, high levels of the three CH 3 Xs in surface seawater were frequently observed, probably owing to their enhanced production by phytoplankton. Supersaturation of CH 3 Br was only present in TW N water, with a saturation anomaly (SCH 3 Br) of 0.95 [SCH 3 X = ( p CH 3 X water − p CH 3 X air )/ p CH 3 X air ]. The highest saturation anomalies for CH 3 Cl (SCH 3 Cl = 1.6) and CH 3 I (SCH 3 I = 91) were found in the southern subtropical water (ST S ) with low biological production south of the subtropical front. We found that the molar concentrations of CH 3 Cl (CCH 3 Cl) and CH 3 I (CCH 3 I) sharply increased with increasing sea surface temperature (SST) in the subtropical waters. The maximum CCH 3 Cl (144 pmol l −1 ) was present in ST S water at SST = 30°C and is 1.5 times the value extrapolated from the previously reported relationship between CCH 3 Cl and SST. Photochemical production might have contributed to the production of CH 3 Cl and CH 3 I in ST S water.
Type of Medium:
Online Resource
ISSN:
0148-0227
DOI:
10.1029/2009JC005703
Language:
English
Publisher:
American Geophysical Union (AGU)
Publication Date:
2010
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