Snowpack processing of acetaldehyde and acetone in the Arctic atmospheric boundary layer

Guimbaud, Christophe; Grannas, A. M.; Shepson, P. B.; Fuentes, José D.; Boudries, H.; Bottenheim, J. W.; Dominé, Florent; Houdier, Stéphan; Perrier, S.; Biesenthal, T.; Splawn, Bryan G.

doi:10.1016/s1352-2310(02)00107-3

Cited by 92 publications

(122 citation statements)

References 25 publications

Supporting

Mentioning

109

Contrasting

Order By: Relevance

“…However, there are no Br 2 or Cl 2 measurements aloft of the surface in the Arctic. Utilizing the method of Guimbaud et al (2002), the effective mixing height, Z*, for Cl 2 at mid-day is only 2.15 m, making the calculated Cl 2 fluxes 1.2 × 10 8 -3.1 × 10 8 molecules cm −2 s −1 ; Z* for Br 2 is 0.5 m, leading to a calculated Br 2 flux of 5.0 × 10 4 -4.5 × 10 8 molecules cm −2 s −1 . Therefore, field studies aimed at determining the magnitude of the surface flux of Cl 2 and Br 2 are warranted.…”

Section: Discussionmentioning

confidence: 99%

“…However, this modeling study suggests that Br 2 should indeed be present in the daytime (given the agreement with observed [BrO]), though it is acknowledged that there is some degree of interference from HOBr, as is apparent from the model overprediction of BrO on 31 March. Considering an e-folding photolytic lifetime of Br 2 at solar noon of 23 s (J max = 0.044 s −1 ), and using the method of Guimbaud et al (2002), the effective daytime mixing height (Z*) of Br 2 in the stable air typical of the Arctic (K c = 95 cm 2 s −1 ) is ∼ 0.5 m. Assuming simple first-order kinetics, the [Br 2 ] remaining after mixing up from the surface to the intake of the CIMS (∼ 1 m or 2 lifetimes) is 10 % that at the surface. A recent study examining Br 2 production from surface snow in Barrow demonstrates that enhanced Br 2 production is observed in the presence of solar radiation (Pratt et al, 2013).…”

Section: Comparison Of Modeled and Observed Mole Ratios For Select Spmentioning

confidence: 99%

See 1 more Smart Citation

Interactions of bromine, chlorine, and iodine photochemistry during ozone depletions in Barrow, Alaska

et al. 2015

View full text Add to dashboard Cite

Abstract. The springtime depletion of tropospheric ozone in the Arctic is known to be caused by active halogen photochemistry resulting from halogen atom precursors emitted from snow, ice, or aerosol surfaces. The role of bromine in driving ozone depletion events (ODEs) has been generally accepted, but much less is known about the role of chlorine radicals in ozone depletion chemistry. While the potential impact of iodine in the High Arctic is more uncertain, there have been indications of active iodine chemistry through observed enhancements in filterable iodide, probable detection of tropospheric IO, and recently, observation of snowpack photochemical production of I 2 . Despite decades of research, significant uncertainty remains regarding the chemical mechanisms associated with the bromine-catalyzed depletion of ozone, as well as the complex interactions that occur in the polar boundary layer due to halogen chemistry. To investigate this, we developed a zero-dimensional photochemical model, constrained with measurements from the 2009 OA-SIS field campaign in Barrow, Alaska. We simulated a 7-day period during late March that included a full ozone depletion event lasting 3 days and subsequent ozone recovery to study the interactions of halogen radicals under these different conditions. In addition, the effects of iodine added to our Base Model were investigated. While bromine atoms were primarily responsible for ODEs, chlorine and iodine were found to enhance the depletion rates and iodine was found to be more efficient per atom at depleting ozone than Br. The interaction between chlorine and bromine is complex, as the presence of chlorine can increase the recycling and production of Br atoms, while also increasing reactive bromine sinks under certain conditions. Chlorine chemistry was also found to have significant impacts on both HO 2 and RO 2 , with organic compounds serving as the primary reaction partner for Cl atoms. The results of this work highlight the need for future studies on the production mechanisms of Br 2 and Cl 2 , as well as on the potential impact of iodine in the High Arctic.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Comparison Of Modeled and Observed Mole Ratios For Select Spmentioning

confidence: 99%

Interactions of bromine, chlorine, and iodine photochemistry during ozone depletions in Barrow, Alaska

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Most of these compounds have been detected in surface snow even in the remote polar areas [15,42,43]. Moreover, the emissions of several volatile compounds from the sunlit snow have been observed in the Arctic [44][45][46] influencing the chemistry in the boundary layer in snow-covered areas [2]. OH radicals can also contribute to the formation and release of molecular chlorine (Cl 2 ) and bromine (Br 2 ) if the snow contains chloride and bromide [2].…”

Section: Discussionmentioning

confidence: 99%

Investigation of the photochemical decomposition of nitrate, hydrogen peroxide, and formaldehyde in artificial snow

Jacobi

Annor

Quansah

2006

Journal of Photochemistry and Photobiology A: Chemistry

109

View full text Add to dashboard Cite

Species like nitrate (NO 3 − ), hydrogen peroxide (H 2 O 2 ), and formaldehyde (HCHO) are ubiquitous trace compounds in snow. Photochemical reactions of these compounds in the snow can have important implications for the composition of the atmospheric boundary layer in snow-covered regions and for the interpretation of concentration profiles in snow and ice regarding the composition of the past atmosphere. Therefore, we performed laboratory experiments to investigate such reactions in artificially produced snow samples. Artificial snow samples allow to execute experiments under defined and reproducible conditions and to investigate single reactions. All reactions were carried out under comparable experimental conditions and indicated that the photolysis of H 2 O 2 and NO 3 − occurred equally fast, while the photolysis of HCHO was considerably slower. Moreover, the photolysis of HCHO was only observed if initial concentrations were much higher than found in natural snow samples. These results indicate that the H 2 O 2 and NO 3 − reactions are possibly equally important in natural snow covers regarding the formation of OH radicals, while the photolysis of HCHO is probably negligible. Nitrite (NO 2 − ) was observed as one of the products of the NO 3 − photolysis; however, it was itself photolyzed at a higher rate than NO 3 − . After a certain photolysis period (≥8 h) the NO 3 − and NO 2 − concentrations in the snow remained constant at a level of 10% of the initial nitrogen content. This is probably due to a recycling of the anions from nitrogen oxides in the gas phase of the reaction cells indicating that the chemical reactions occur in or near the surface layer of the snow crystals.

show abstract

“…OC records in glaciers are of great significance to global carbon dynamics, snow photochemistry, and air-snow exchange processes (Antony et al, 2011;Niu et al, 2017a). It was also known that photochemical reactions of OC in snow and ice can release reactive gaseous species into the overlying atmosphere (Guimbaud et al, 2002;Grannas et al, 2004;Niu et al, 2017b).…”

Section: Introductionmentioning

confidence: 99%

Distributions and light absorption property of water soluble organic carbon in a typical temperate glacier, southeastern Tibetan Plateau

Niu

Kang

et al. 2018

Tellus B: Chemical and Physical Meteorology

View full text Add to dashboard Cite

Snowpack processing of acetaldehyde and acetone in the Arctic atmospheric boundary layer

Cited by 92 publications

References 25 publications

Interactions of bromine, chlorine, and iodine photochemistry during ozone depletions in Barrow, Alaska

Interactions of bromine, chlorine, and iodine photochemistry during ozone depletions in Barrow, Alaska

Investigation of the photochemical decomposition of nitrate, hydrogen peroxide, and formaldehyde in artificial snow

Distributions and light absorption property of water soluble organic carbon in a typical temperate glacier, southeastern Tibetan Plateau

Contact Info

Product

Resources

About