Global modeling of tropospheric iodine aerosol

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• 作者：Tomás M. Sherwen ; Mat J. Evans ; Dominick V. Spracklen ; Lucy J. Carpenter ; Rosie Chance ; Alex R. Baker ; Johan A. Schmidt ; Thomas J. Breider
• 刊名：Geophysical Research Letters
• 出版年：2016
• 出版时间：28 September 2016
• 年：2016
• 卷：43
• 期：18
• 页码：10012-10019
• 全文大小：1.1MB
• ISSN：1944-8007

文摘

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 data set. 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 dimethyl sulfide sourced sulfate (3% of the MBL burden, up to 101% regionally). In the preindustrial, 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.