Detection of iodine monoxide radicals in the marine boundary layer using laser induced fluorescence spectroscopy

Whalley, Lisa K.; Furneaux, K. L.; Gravestock, Tom; Atkinson, Helen; Bale, Catherine S.E.; Ingham, T.; Bloss, William J.; Heard, D. E.

doi:10.1007/s10874-007-9075-9

Cited by 62 publications

(74 citation statements)

References 52 publications

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“…This result is further supported by additional measurements at Mweenish Bay where IO mixing ratios of up to 35.0 ± 7.7 ppt were observed by a very short DOAS light-path (500 m, one-way) which covered exclusively the exposed seaweed beds at low tide [Seitz et al, 2009]. It is noted that this maximum IO concentration is very close to the littoral level (27.6 ± 3.2 ppt) at Roscoff (Brittany, France) measured by the ''sing-point'' in situ technique of cavity ring-down spectroscopy [Wada et al, 2007] and laser induced fluorescence spectroscopy [Whalley et al, 2007]. It may therefore be inferred that the actual IO concentration could be 5 -10 times higher than that reported from LP-DOAS measurements of several kilometers extending over open sea in the coastal atmosphere at Mweenish Bay and nearby locations.…”

Section: Resultsmentioning

confidence: 83%

Observations of high concentrations of I₂ and IO in coastal air supporting iodine‐oxide driven coastal new particle formation

Huang

Seitz

Neary

et al. 2010

Geophysical Research Letters

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[1] Theoretical studies have predicted that concentrations of gaseous I 2 and IO of the order of 80 -100 ppt and 40-50 ppt, respectively, are required in coastal air to account for photochemically-driven coastal new-particle formation events to occur. However, measurements reported to date (i.e., $20 ppt I 2 , 10 ppt IO) have not supported the required model predictions. Here, we present measurements of high concentrations of I 2 and IO in N.E. Atlantic marine air on the west coast of Ireland. The maximum mixing ratios of daytime I 2 and IO over the seaweed beds during low tide were 302 ppt and 35 ppt, respectively. The I 2 distribution was rather inhomogeneous, even at the inter-tidal zone, but closely related to the macroalgae biomass abundance. New particle formation bursts were frequently observed during daytime hours with the concentrations up to 4.5 Â 10 5 particles cm À3 during low-tide conditions, and the concentrations of ultra-fine particles were positively correlated with the IO concentrations. Considering the constraints set out in theoretical studies for new particle formation via condensation of condensable iodine oxide vapours, the results reported here clearly demonstrate that the molecular iodine and iodine monoxide concentrations in coastal air are sufficient to meet the theoretical precursor concentrations required to drive intensive coastal newparticle formation from higher order condensable iodine oxides. Citation: Huang, R. J., K. Seitz, T. Neary, C. D. O'Dowd, U. Platt, and T. Hoffmann (2010), Observations of high concentrations of I 2 and IO in coastal air supporting iodineoxide driven coastal new particle formation, Geophys. Res. Lett., 37, L03803,

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Section: Resultsmentioning

confidence: 83%

Observations of high concentrations of I₂ and IO in coastal air supporting iodine‐oxide driven coastal new particle formation

Huang

Seitz

Neary

et al. 2010

Geophysical Research Letters

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“…Phys., 8,[3789][3790][3791][3792][3793][3794][3795][3796][3797][3798][3799][3800][3801][3802][3803]2008 www.atmos-chem-phys.net/8/3789/2008/ The year-round measurements of BrO and IO made during CHABLIS revealed the key role of halogens in determining boundary layer chemistry at Halley. A springtime maximum in both radicals was measured, the observed IO peak at 20 pptv having only recently been exceeded (Whalley et al, 2007). The NMHC data gathered during CHABLIS allowed a kinetic analysis that revealed significant concentrations of both Cl and Br atoms during ozone depletion events (ODEs), with Cl in the range 1.7×10 3 to 3.4×10 4 atom cm −3 and Br in the range 1.4×10 6 to 2.9×10 7 atom cm −3 (Read et al, 2007).…”

Section: Key Findings From Chablismentioning

confidence: 99%

Chemistry of the Antarctic Boundary Layer and the Interface with Snow: an overview of the CHABLIS campaign

et al. 2008

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Abstract. CHABLIS (Chemistry of the Antarctic BoundaryLayer and the Interface with Snow) was a collaborative UK research project aimed at probing the detailed chemistry of the Antarctic boundary layer and the exchange of trace gases at the snow surface. The centre-piece to CHABLIS was the measurement campaign, conducted at the British Antarctic Survey station, Halley, in coastal Antarctica, from January 2004 through to February 2005. The campaign measurements covered an extremely wide range of species allowing investigations to be carried out within the broad context of boundary layer chemistry. Here we present an overview of the CHABLIS campaign. We provide details of the measurement location and introduce the Clean Air Sector Laboratory (CASLab) where the majority of the instruments were housed. We describe the meteorological conditions experienced during the campaign and present supporting chemical data, both of which provide a context within which to view the campaign results. Finally we provide a brief sumCorrespondence to: A. E. Jones (a.jones@bas.ac.uk) mary of highlights from the measurement campaign. Unexpectedly high halogen concentrations profoundly affect the chemistry of many species at Halley throughout the sunlit months, with a secondary role played by emissions from the snowpack. This overarching role for halogens in coastal Antarctic boundary layer chemistry was completely unanticipated, and the results have led to a step-change in our thinking and understanding.

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“…In contrast to the HO x FAGE, the ship instrument exploited the IO excitation wavelength at 445 nm, with offresonance fluorescence at 520 nm (see Whalley et al, 2007). NO measurements were made by chemiluminescence using an Ecophysics CLD 780 TR nitric oxide analyser.…”

Section: Technique Descriptionsmentioning

confidence: 99%

Reactive Halogens in the Marine Boundary Layer (RHaMBLe): the tropical North Atlantic experiments

et al. 2010

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Abstract. The NERC UK SOLAS-funded Reactive Halogens in the Marine Boundary Layer (RHaMBLe) programme comprised three field experiments. This manuscript presentsCorrespondence to: G. McFiggans (g.mcfiggans@manchester.ac.uk) an overview of the measurements made within the two simultaneous remote experiments conducted in the tropical North Atlantic in May and June 2007. Measurements were made from two mobile and one ground-based platforms. The heavily instrumented cruise D319 on the RRS Discovery from Lisbon, Portugal to São Vicente, Cape Verde and back to Falmouth, UK was used to characterise the spatial distribution Published by Copernicus Publications on behalf of the European Geosciences Union. of boundary layer components likely to play a role in reactive halogen chemistry. Measurements onboard the ARSF Dornier aircraft were used to allow the observations to be interpreted in the context of their vertical distribution and to confirm the interpretation of atmospheric structure in the vicinity of the Cape Verde islands. Long-term ground-based measurements at the Cape Verde Atmospheric Observatory (CVAO) on São Vicente were supplemented by long-term measurements of reactive halogen species and characterisation of additional trace gas and aerosol species during the intensive experimental period.This paper presents a summary of the measurements made within the RHaMBLe remote experiments and discusses them in their meteorological and chemical context as determined from these three platforms and from additional meteorological analyses. Air always arrived at the CVAO from the North East with a range of air mass origins (European, Atlantic and North American continental). Trace gases were present at stable and fairly low concentrations with the exception of a slight increase in some anthropogenic components in air of North American origin, though NO x mixing ratios during this period remained below 20 pptv (note the non-IUPAC adoption in this manuscript of pptv and ppbv, equivalent to pmol mol −1 and nmol mol −1 to reflect common practice). Consistency with these air mass classifications is observed in the time series of soluble gas and aerosol composition measurements, with additional identification of periods of slightly elevated dust concentrations consistent with the trajectories passing over the African continent. The CVAO is shown to be broadly representative of the wider North Atlantic marine boundary layer; measurements of NO, O 3 and black carbon from the ship are consistent with a clean Northern Hemisphere marine background. Aerosol composition measurements do not indicate elevated organic material associated with clean marine air. Closer to the African coast, black carbon and NO levels start to increase, indicating greater anthropogenic influence. Lower ozone in this region is possibly associated with the increased levels of measured halocarbons, associated with the nutrient rich waters of the Mauritanian upwelling. Bromide and chloride deficits in coarse mode aerosol at both the CVAO and on D319 and th...

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Detection of iodine monoxide radicals in the marine boundary layer using laser induced fluorescence spectroscopy

Cited by 62 publications

References 52 publications

Observations of high concentrations of I₂ and IO in coastal air supporting iodine‐oxide driven coastal new particle formation

Observations of high concentrations of I₂ and IO in coastal air supporting iodine‐oxide driven coastal new particle formation

Chemistry of the Antarctic Boundary Layer and the Interface with Snow: an overview of the CHABLIS campaign

Reactive Halogens in the Marine Boundary Layer (RHaMBLe): the tropical North Atlantic experiments

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Detection of iodine monoxide radicals in the marine boundary layer using laser induced fluorescence spectroscopy

Cited by 62 publications

References 52 publications

Observations of high concentrations of I2 and IO in coastal air supporting iodine‐oxide driven coastal new particle formation

Observations of high concentrations of I2 and IO in coastal air supporting iodine‐oxide driven coastal new particle formation

Chemistry of the Antarctic Boundary Layer and the Interface with Snow: an overview of the CHABLIS campaign

Reactive Halogens in the Marine Boundary Layer (RHaMBLe): the tropical North Atlantic experiments

Contact Info

Product

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Observations of high concentrations of I₂ and IO in coastal air supporting iodine‐oxide driven coastal new particle formation

Observations of high concentrations of I₂ and IO in coastal air supporting iodine‐oxide driven coastal new particle formation