Comment on egusphere-2023-2953 DOI Creative Commons

Matthew Boyer,

Diego Aliaga, Lauriane L. J. Quéléver

et al.

Published: May 7, 2024

Abstract. In this study, we present and analyze the first continuous timeseries of relevant aerosol precursor vapors from central Arctic during Multidisciplinary drifting Observatory for Study Climate (MOSAiC) expedition. These include sulfuric acid (SA), methanesulfonic (MSA), iodic (IA). We use FLEXPART simulations, inverse modeling, sulfur dioxide (SO2) mixing ratios, chlorophyll-a (chl-a) observations to interpret 20 seasonal variability vapor concentrations identify dominant sources. Our results show that both natural anthropogenic sources are SA in Arctic, but associated with haze most prevalent. MSA an order magnitude higher polar day than night due changes biological activity. Peak were observed May, which corresponds timing annual peak chl-a north 75° N. IA exhibit two distinct peaks 25 year: a spring secondary autumn, suggesting depend on solar radiation sea ice conditions. general, cycles SA, MSA, Ocean related conditions, expect environment will affect these future. The subsequent influence processes remains uncertain, highlighting need continued Arctic.

Language: Английский

Iodine in the Atmosphere I: Computational Benchmark and Dimer Formation of Oxy-acids and Oxides DOI Creative Commons
Morten Engsvang, Haide Wu, Jonas Elm

et al.

Published: Feb. 7, 2024

The contribution of iodine-containing compounds to atmospheric new particle formation is still not fully understood, but iodic acid and iodous are thought be significant contributors. While several quantum chemical studies have been carried out on clusters containing iodine, there no comprehensive benchmark study quantifying the accuracy applied methods. Here, we present first paper in a series that investigate role iodine species cluster formation. In this work, studied monomers, tetroxide pentoxide their dimer with common precursors. We tested commonly methods for calculating geome- try thermal corrections monomers dimers, spin-orbit coupling finally electronic energy correction calculated at different levels theory. find optimizing structures either ωB97X-D3BJ/aug-cc-pVTZ-PP or M06-2X/aug-cc-pVTZ-PP level achieves best binding free energy. can then ZORA-DLPNO-CCSD(T0) SARC-ZORA-TZVPP basis ma-ZORA-def2-TZVPP non-iodine atoms. This combination yields results excellent agreement relativistic calculations comparatively low computational cost. methodology calculate energies clusters, where confirm qualitative trends observed previous studies. However, identify overestimate stability by kcal/mol due neglect effects. means currently nucleation pathways likely overestimated.

Language: Английский

Citations

0
Comment on egusphere-2023-2953 DOI Creative Commons

Matthew Boyer,

Diego Aliaga,

Lauriane L. J. Quéléver

et al.

Published: Feb. 7, 2024

Abstract. In this study, we present and analyze the first continuous timeseries of relevant aerosol precursor vapors from central Arctic during Multidisciplinary drifting Observatory for Study Climate (MOSAiC) expedition. These include sulfuric acid (SA), methanesulfonic (MSA), iodic (IA). We use FLEXPART simulations, inverse modeling, sulfur dioxide (SO2) mixing ratios, chlorophyll-a (chl-a) observations to interpret 20 seasonal variability vapor concentrations identify dominant sources. Our results show that both natural anthropogenic sources are SA in Arctic, but associated with haze most prevalent. MSA an order magnitude higher polar day than night due changes biological activity. Peak were observed May, which corresponds timing annual peak chl-a north 75° N. IA exhibit two distinct peaks 25 year: a spring secondary autumn, suggesting depend on solar radiation sea ice conditions. general, cycles SA, MSA, Ocean related conditions, expect environment will affect these future. The subsequent influence processes remains uncertain, highlighting need continued Arctic.

Language: Английский

Citations

0
Comment on egusphere-2023-2953 DOI Creative Commons

Matthew Boyer,

Diego Aliaga, Lauriane L. J. Quéléver

et al.

Published: April 11, 2024

Abstract. In this study, we present and analyze the first continuous timeseries of relevant aerosol precursor vapors from central Arctic during Multidisciplinary drifting Observatory for Study Climate (MOSAiC) expedition. These include sulfuric acid (SA), methanesulfonic (MSA), iodic (IA). We use FLEXPART simulations, inverse modeling, sulfur dioxide (SO2) mixing ratios, chlorophyll-a (chl-a) observations to interpret 20 seasonal variability vapor concentrations identify dominant sources. Our results show that both natural anthropogenic sources are SA in Arctic, but associated with haze most prevalent. MSA an order magnitude higher polar day than night due changes biological activity. Peak were observed May, which corresponds timing annual peak chl-a north 75° N. IA exhibit two distinct peaks 25 year: a spring secondary autumn, suggesting depend on solar radiation sea ice conditions. general, cycles SA, MSA, Ocean related conditions, expect environment will affect these future. The subsequent influence processes remains uncertain, highlighting need continued Arctic.

Language: Английский

Citations

0
Comment on egusphere-2023-2953 DOI Creative Commons

Matthew Boyer,

Diego Aliaga, Lauriane L. J. Quéléver

et al.

Published: April 15, 2024

Abstract. In this study, we present and analyze the first continuous timeseries of relevant aerosol precursor vapors from central Arctic during Multidisciplinary drifting Observatory for Study Climate (MOSAiC) expedition. These include sulfuric acid (SA), methanesulfonic (MSA), iodic (IA). We use FLEXPART simulations, inverse modeling, sulfur dioxide (SO2) mixing ratios, chlorophyll-a (chl-a) observations to interpret 20 seasonal variability vapor concentrations identify dominant sources. Our results show that both natural anthropogenic sources are SA in Arctic, but associated with haze most prevalent. MSA an order magnitude higher polar day than night due changes biological activity. Peak were observed May, which corresponds timing annual peak chl-a north 75° N. IA exhibit two distinct peaks 25 year: a spring secondary autumn, suggesting depend on solar radiation sea ice conditions. general, cycles SA, MSA, Ocean related conditions, expect environment will affect these future. The subsequent influence processes remains uncertain, highlighting need continued Arctic.

Language: Английский

Citations

0
Comment on egusphere-2023-2953 DOI Creative Commons

Matthew Boyer,

Diego Aliaga, Lauriane L. J. Quéléver

et al.

Published: May 7, 2024

Abstract. In this study, we present and analyze the first continuous timeseries of relevant aerosol precursor vapors from central Arctic during Multidisciplinary drifting Observatory for Study Climate (MOSAiC) expedition. These include sulfuric acid (SA), methanesulfonic (MSA), iodic (IA). We use FLEXPART simulations, inverse modeling, sulfur dioxide (SO2) mixing ratios, chlorophyll-a (chl-a) observations to interpret 20 seasonal variability vapor concentrations identify dominant sources. Our results show that both natural anthropogenic sources are SA in Arctic, but associated with haze most prevalent. MSA an order magnitude higher polar day than night due changes biological activity. Peak were observed May, which corresponds timing annual peak chl-a north 75° N. IA exhibit two distinct peaks 25 year: a spring secondary autumn, suggesting depend on solar radiation sea ice conditions. general, cycles SA, MSA, Ocean related conditions, expect environment will affect these future. The subsequent influence processes remains uncertain, highlighting need continued Arctic.

Language: Английский

Citations

0