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Latitudinal distribution of reactive iodine in the Eastern Pacific and its link to open ocean sources

Mahajan, AS and Gomez Marti­n, JC and Hay, TD and Royer, SJ and Yvon-Lewis, S and Liu, Y and Hu, L and Prados-Roman, C and Ordonez, C and Plane, JMC and Saiz-Lopez, A. (2012) Latitudinal distribution of reactive iodine in the Eastern Pacific and its link to open ocean sources. Atmospheric Chemistry and Physics, 12 (23). pp. 11609-11617.

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Abstract

Ship-based Multi-Axis Differential Optical Absorption Spectroscopy measurements of iodine monoxide (IO) and atmospheric and seawater Gas Chromatography-Mass Spectrometer observations of methyl iodide (CH3I) were made in the Eastern Pacific marine boundary layer during April 2010 as a part of the HaloCarbon Air Sea Transect-Pacific (HaloCAST-P) scientific cruise. The presence of IO in the open ocean environment was confirmed, with a maximum differential slant column density of 5 × 1013 molecules cm−2 along the 1° elevation angle (corresponding to approximately 1 pptv) measured in the oligotrophic region of the Southeastern Pacific. Such low IO mixing ratios and their observed geographical distribution are inconsistent with satellite estimates and with previous understanding of oceanic sources of iodine. A strong correlation was observed between reactive iodine (defined as IO + I) and CH3I, suggesting common sources.

Item Type: Article
Additional Information: Copyright of this article belongs to Author(s) 2012. This work is distributed under the Creative Commons Attribution 3.0 License.
Uncontrolled Keywords: boundary layer; chlorophyll a; dissolved organic matter; gas chromatography; in situ measurement; iodine; marine atmosphere; mass spectrometry; open water; sea surface temperature; seawater, Pacific Ocean; Pacific Ocean (East); Pacific Ocean (Southeast), Vindula arsinoe
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 13 Mar 2014 11:12
Last Modified: 13 Mar 2014 11:12
URI: http://moeseprints.incois.gov.in/id/eprint/424

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