World Library  

Add to Book Shelf
Flag as Inappropriate
Email this Book

Numerical Modelling of Methyl Iodide in the Eastern Tropical Atlantic : Volume 10, Issue 1 (24/01/2013)

By Stemmler, I.

Click here to view

Book Id: WPLBN0003973868
Format Type: PDF Article :
File Size: Pages 35
Reproduction Date: 2015

Title: Numerical Modelling of Methyl Iodide in the Eastern Tropical Atlantic : Volume 10, Issue 1 (24/01/2013)  
Author: Stemmler, I.
Volume: Vol. 10, Issue 1
Language: English
Subject: Science, Biogeosciences, Discussions
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


APA MLA Chicago

Hense, I., Rothe, M., & Stemmler, I. (2013). Numerical Modelling of Methyl Iodide in the Eastern Tropical Atlantic : Volume 10, Issue 1 (24/01/2013). Retrieved from

Description: Institute for Hydrobiology and Fisheries Science, CEN, University of Hamburg, Hamburg, Germany. Methyl iodide (CH3I) is a volatile organic halogen compound that contributes significantly to the transport of iodine from the ocean to the atmosphere, where it plays an important role in tropospheric chemistry. CH3I is naturally produced and occurs in the global ocean. The processes involved in the formation of CH3I, however, are not fully understood. In fact, there is an ongoing debate whether production by phytoplankton or photochemical degradation of organic matter is the main source term. Here, both the biological and photochemical production mechanisms are considered in a biogeochemical module that is coupled to a one-dimensional water column model for the Eastern Tropical Atlantic. The model is able to reproduce observed subsurface maxima of CH3I concentrations. But, the dominating source process cannot be clearly identified as subsurface maxima can occur due to both, direct biological and photochemical production. However, good agreement between the observed and simulated difference between surface and subsurface methyl iodide concentrations is achieved only when direct biological production is taken into account. Published production rates for the biological CH3I source that were derived from laboratory studies are shown to be inappropriate for explaining CH3I concentrations in the Eastern Tropical Atlantic.

Numerical modelling of methyl iodide in the Eastern Tropical Atlantic

Chameides, W. and Davis, D.: Iodine: its possible role in tropospheric photochemistry, J. Geophys. Res., 85, 7383–7398, 1980.; Agusti, S.: Viability and niche segregation of Prochlorococcus and Synechococcus cells across the Central Atlantic Ocean, Aquat. Microb. Ecol., 36, 53–59, 2004.; Bange, H.: FS Poseidon Fahrtbericht/Cruise Report P399 – 2 & 3: Eastern tropical North Atlantic; P399-2: 31.04.2010–17.06.2010 Las Palmas – Las Palmas (Canary Islands), P399-3: 18.–24.06.2010 Las Palmas (Canary Islands) – Vigo (Spain); DRIVE (Diurnal and RegIonal Variability of Halogen Emmissions), SOPRAN, Cruise Report 10.3289/ifm-geomar_rep_48_2011, IfM-Geomar Kiel, Kiel, available at:, 2011.; Bell, N., Hsu, L., Jacob, D., Schultz, M., Blake, D., Butler, J., King, D., Lobert, J., and Maier-Reimer, E.: Methyl iodide: atmospheric budget and use as a tracer of marine convection in global models, J. Geophys. Res., 107, 4340, doi:10.1029/2001JD001151, 2002; Carpenter, L. and Liss, P.: On temperate sources of bromoform and other reactive organic bromine gases, J. Geophys. Res.-Atmos., 105, 20539–20547, 2000.; Brownell, D., Moore, R., and Cullen, J.: Production of methyl halides by Prochlorococcus and Synechococcus, Global Biogeochem. Cy., 24, GB2002, doi:10.1029/2009GB003671, 2010.; Carlson, C.: Biogeochemistry of marine dissolved organic matter, chap. Production and removal processes, 91–152, Academic Press, An Elsevier Science Imprint, 2002.; Chuck, A., Turner, S., and Liss, P.: Oceanic distributions and air-sea fluxes of biogenic halocarbons in the open ocean, J. Geophys. Res.-Oceans, 110, 1–12, 2005.; Conkright, M. E., Locarnini, R. A., Garcia, H. E., O'Brien, T. D., Boyer, T. P., Stephens, C., and Antonov, J. I.: World Ocean Atlas 2001: Objective Analyses, Data Statistics, and Figures, CDROM Documentation, Tech. rep., National Oceanographic Data Center, Silver Spring, MD, USA, 2002.; Dittmar, W.: Part I: report on researches into the composition of ocean-water, collected by H.M.S. Challenger, during the years 1873–1876, Phys. Chem., 1, 1–247, 1884.; Elliott, S. and Rowland, F.: Nucleophilic substitution rates and solubilities for methyl halides in seawater, Geophys. Res. Lett., 20, 1043–1046, 1993.; Elliott, S. and Rowland, F.: Methyl halide hydrolysis rates in natural waters, J. Atmos. Chem., 20, 229–236, 1995.; Happell, J. and Wallace, D.: Methyl iodide in the Greenland/Norwegian Seas and the tropical Atlantic Ocean: evidence for photochemical production, Geophys. Res. Lett., 23, 2105–2108, 1996.; Hense, I. and Beckmann, A.: Revisiting subsurface chlorophyll and phytoplankton distributions, Deep-Sea Res. Part I, 55, 1193–1199, 2008.; Hense, I. and Quack, B.: Modelling the vertical distribution of bromoform in the upper water column of the tropical Atlantic Ocean, Biogeosciences, 6, 535–544, doi:10.5194/bg-6-535-2009, 2009.; Hughes, C., Franklin, D., and Malin, G.: Iodomethane production by two important marine cyanobacteria: Prochlorococcus marinus (CCMP 2389) and Synechococcus sp. (CCMP 2370), Mar. Chem., 125, 19–25, 2011.; Lovelock, J., Maggs, R., and Wade, R.: Halogenated hydrocarbons in and over the Atlant


Click To View

Additional Books

  • Dependence of the Cyclization of Branche... (by )
  • Comment on Effects of Long-term High Co2... (by )
  • Quantitative Observation of Cyanobacteri... (by )
  • Linking Plant Ecophysiology to the Dynam... (by )
  • Projected Impacts of Climate Change and ... (by )
  • Dynamics of Dissolved Inorganic Carbon a... (by )
  • Soil Respiration Compartments on an Agin... (by )
  • Temporal Variation of Nitrate and Phosph... (by )
  • Quantifying Nitrous Oxide Emissions from... (by )
  • Can Whales Mix the Ocean? : Volume 9, Is... (by )
  • Seasonal Variation of Mono- and Sesquite... (by )
  • Ocean Acidification Effects in the Early... (by )
Scroll Left
Scroll Right


Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.