Iodine monoxide in the Western Pacific marine boundary layer

被引：55

作者：

Grossmann, K. ^{[1
]}

Friess, U. ^{[1
]}

Peters, E. ^{[2
]}

Wittrock, F. ^{[2
]}

Lampel, J. ^{[1
]}

Yilmaz, S. ^{[1
]}

Tschritter, J. ^{[1
]}

Sommariva, R. ^{[3
]}

von Glasow, R. ^{[3
]}

Quack, B. ^{[4
]}

Krueger, K. ^{[4
]}

Pfeilsticker, K. ^{[1
]}

Platt, U. ^{[1
]}

机构：

[1] Heidelberg Univ, Inst Environm Phys, Heidelberg, Germany

[2] Univ Bremen, Inst Environm Phys, D-28359 Bremen, Germany

[3] Univ E Anglia, Sch Environm Sci, Norwich NR4 7TJ, Norfolk, England

[4] Helmholtz Ctr Ocean Res Kiel, GEOMAR, Kiel, Germany

来源：

ATMOSPHERIC CHEMISTRY AND PHYSICS | 2013年 / 13卷 / 06期

关键词：

ABSORPTION CROSS-SECTIONS; MAX-DOAS; ATMOSPHERIC AEROSOLS; DERIVE INFORMATION; RADIATIVE-TRANSFER; HALOGEN CHEMISTRY; REACTIVE IODINE; SEA-SURFACE; OZONE; NO2;

D O I：

10.5194/acp-13-3363-2013

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A latitudinal cross-section and vertical profiles of iodine monoxide (IO) are reported from the marine boundary layer of the Western Pacific. The measurements were taken using Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) during the TransBrom cruise of the German research vessel Sonne, which led from Tomakomai, Japan (42 degrees N, 141 degrees E) through the Western Pacific to Townsville, Australia (19 degrees S, 146 degrees E) in October 2009. In the marine boundary layer within the tropics (between 20 degrees N and 5 degrees S), IO mixing ratios ranged between 1 and 2.2 ppt, whereas in the subtropics and at mid-latitudes typical IO mixing ratios were around 1 ppt in the daytime. The profile retrieval reveals that the bulk of the IO was located in the lower part of the marine boundary layer. Photochemical simulations indicate that the organic iodine precursors observed during the cruise (CH3I, CH2I2, CH2ClI, CH2BrI) are not sufficient to explain the measured IO mixing ratios. Reasonable agreement between measured and modelled IO can only be achieved if an additional sea-air flux of inorganic iodine (e. g., I-2) is assumed in the model. Our observations add further evidence to previous studies that reactive iodine is an important oxidant in the marine boundary layer.

引用

页码：3363 / 3378

页数：16

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