Global modelling of tropospheric iodine aerosol

Tomás M. Sherwen; Mat J. Evans; Dominick V. Spracklen; Lucy J. Carpenter; Rosie Chance; Alex R. Baker; Johan A. Schmidt; Thomas J. Breider

doi:10.1002/2016GL070062

Global modelling of tropospheric iodine aerosol

Tomás M. Sherwen, Mat J. Evans, Dominick V. Spracklen, Lucy J. Carpenter, Rosie Chance, Alex R. Baker, Johan A. Schmidt, Thomas J. Breider

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Abstract

Natural aerosols play a central role in the Earth system. The conversion of dimethyl sulfide to sulfuric acid is the dominant source of oceanic secondary aerosol. Ocean emitted iodine can also produce aerosol. Using a GEOS-Chem model we present a simulation of iodine aerosol. The simulation compares well with the limited observational dataset. Iodine aerosol concentrations are highest in the tropical marine-boundary layer (MBL) averaging 5.2 ng (I) m-3 with monthly maximum concentrations of 90 ng (I) m-3. These masses are small compared to sulfate (0.75% of MBL burden, up to 11% regionally) but are more significant compared to DMS sourced sulfate (3% of the MBL burden, up to 101% regionally). In the pre-industrial, iodine aerosol makes up 0.88 % of the MBL burden sulfate mass and regionally up to 21%. Iodine aerosol may be an important regional mechanism for ocean-atmosphere interaction.

Original language	English
Pages (from-to)	10012–10019
Number of pages	8
Journal	Geophysical Research Letters
Volume	43
Issue number	18
Early online date	4 Sep 2016
DOIs	https://doi.org/10.1002/2016GL070062 https://doi.org/10.1002/2016GL070062
Publication status	Published - 28 Sep 2016

Keywords

iodine
aerosol
dimethyl sulfide
marine boundary layer
DMS
sulfate

Access to Document

10.1002/2016GL070062Licence: CC BY
10.1002/2016GL070062Licence: CC BY

Published manuscript
©2016. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Final published version, 1.11 MBLicence: CC BY

Cite this

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title = "Global modelling of tropospheric iodine aerosol",

abstract = "Natural aerosols play a central role in the Earth system. The conversion of dimethyl sulfide to sulfuric acid is the dominant source of oceanic secondary aerosol. Ocean emitted iodine can also produce aerosol. Using a GEOS-Chem model we present a simulation of iodine aerosol. The simulation compares well with the limited observational dataset. Iodine aerosol concentrations are highest in the tropical marine-boundary layer (MBL) averaging 5.2 ng (I) m-3 with monthly maximum concentrations of 90 ng (I) m-3. These masses are small compared to sulfate (0.75% of MBL burden, up to 11% regionally) but are more significant compared to DMS sourced sulfate (3% of the MBL burden, up to 101% regionally). In the pre-industrial, iodine aerosol makes up 0.88 % of the MBL burden sulfate mass and regionally up to 21%. Iodine aerosol may be an important regional mechanism for ocean-atmosphere interaction.",

keywords = "iodine, aerosol, dimethyl sulfide, marine boundary layer, DMS, sulfate",

author = "Sherwen, {Tom{\'a}s M.} and Evans, {Mat J.} and Spracklen, {Dominick V.} and Carpenter, {Lucy J.} and Rosie Chance and Baker, {Alex R.} and Schmidt, {Johan A.} and Breider, {Thomas J.}",

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year = "2016",

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language = "English",

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TY - JOUR

T1 - Global modelling of tropospheric iodine aerosol

AU - Sherwen, Tomás M.

AU - Evans, Mat J.

AU - Spracklen, Dominick V.

AU - Carpenter, Lucy J.

AU - Chance, Rosie

AU - Baker, Alex R.

AU - Schmidt, Johan A.

AU - Breider, Thomas J.

N1 - ©2016. The Authors. This is an open access article under theterms of the Creative CommonsAttribution License, which permits use,distribution and reproduc tion in anymedium, provided the original work isproperly cited.

PY - 2016/9/28

Y1 - 2016/9/28

N2 - Natural aerosols play a central role in the Earth system. The conversion of dimethyl sulfide to sulfuric acid is the dominant source of oceanic secondary aerosol. Ocean emitted iodine can also produce aerosol. Using a GEOS-Chem model we present a simulation of iodine aerosol. The simulation compares well with the limited observational dataset. Iodine aerosol concentrations are highest in the tropical marine-boundary layer (MBL) averaging 5.2 ng (I) m-3 with monthly maximum concentrations of 90 ng (I) m-3. These masses are small compared to sulfate (0.75% of MBL burden, up to 11% regionally) but are more significant compared to DMS sourced sulfate (3% of the MBL burden, up to 101% regionally). In the pre-industrial, iodine aerosol makes up 0.88 % of the MBL burden sulfate mass and regionally up to 21%. Iodine aerosol may be an important regional mechanism for ocean-atmosphere interaction.

AB - Natural aerosols play a central role in the Earth system. The conversion of dimethyl sulfide to sulfuric acid is the dominant source of oceanic secondary aerosol. Ocean emitted iodine can also produce aerosol. Using a GEOS-Chem model we present a simulation of iodine aerosol. The simulation compares well with the limited observational dataset. Iodine aerosol concentrations are highest in the tropical marine-boundary layer (MBL) averaging 5.2 ng (I) m-3 with monthly maximum concentrations of 90 ng (I) m-3. These masses are small compared to sulfate (0.75% of MBL burden, up to 11% regionally) but are more significant compared to DMS sourced sulfate (3% of the MBL burden, up to 101% regionally). In the pre-industrial, iodine aerosol makes up 0.88 % of the MBL burden sulfate mass and regionally up to 21%. Iodine aerosol may be an important regional mechanism for ocean-atmosphere interaction.

KW - iodine

KW - aerosol

KW - dimethyl sulfide

KW - marine boundary layer

KW - DMS

KW - sulfate

U2 - 10.1002/2016GL070062

DO - 10.1002/2016GL070062

M3 - Article

VL - 43

SP - 10012

EP - 10019

JO - Geophysical Research Letters

JF - Geophysical Research Letters

SN - 0094-8276

IS - 18

ER -