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The production of volatile iodocarbons by biogenic marine aggregates

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Author(s)

  • Claire Hughes
  • Gill Malin
  • Carol Turley
  • Brendan Keely
  • Philip Nightingale
  • Peter Liss

Department/unit(s)

Publication details

JournalLIMNOLOGY AND OCEANOGRAPHY
DatePublished - Mar 2008
Issue number2
Volume53
Number of pages5
Pages (from-to)867-872
Original languageEnglish

Abstract

We present the first reported measurements of volatile iodocarbon production by biogenic marine aggregates. Iodomethane (CH3I), iodoethane (C2H5I), 2-iodopropane (CH3CHICH3), and 1-iodopropane (CH3CH2CH2I) concentrations were determined in incubations of aggregates formed by concentrating the >53 mu m fraction of the plankton during a field campaign in the Celtic Sea. All four iodocarbons increased significantly in concentration in the aggregate incubations relative to filtered seawater controls. Maximum production rates ranged from 0.01 pmol L-1 h(-1) for CH3CHICH3 to 0.31 pmol L-1 h(-1) for C2H5I. Accompanying pheopigment and bacterial heterotrophic production suggest that the processes taking place on the aggregates studied were a good representation of those known to occur on natural marine particles. We also report iodocarbon production rates observed in natural marine aggregates, including a diatom mucilage collected in the Celtic Sea and phytodetritus sampled from Kongsfjord in the Arctic. Detrital particles could be hotspots of iodocarbon production in the marine environment.

    Research areas

  • METHYL-IODIDE, BOUNDARY-LAYER, CELTIC SEA, SNOW, ENVIRONMENT, CHEMISTRY, ACCUMULATION, HALOCARBONS, COASTAL, OCEAN

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