Reply on RC2 DOI Creative Commons

Moein Mellat

Published: June 7, 2024

Abstract. The Arctic Ocean’s snow cover is crucial in moderating interactions between sea-ice and the atmosphere, yet fully grasping its isotopic composition processes shaping it presents substantial challenges. This study employs a unique dataset from Multidisciplinary drifting Observatory for Study of Climate (MOSAiC) expedition to explore complex deposition post-depositional changes affecting on sea ice. By examining 911 individual isotope measurements collected over full year, we identify clear layering within snowpack: top layer, with lower δ18O values higher d-excess values, indicates fresh meteoric snowfall, while bottom affected by ice beneath, shows d- d-excess values. integrating these discrete samples continuous vapour data, our research provides insight into as well that alter signatures snow. We observe significant difference vapor during autumn, mainly due delays sampling after precipitation events, ranges suggesting impact Atlantic moisture. Winter months exhibit sharp differences indicating kinetic fractionation amid extreme cold RV Polarstern traverses Siberian sector Ocean. Conversely, summer display convergence signatures, reflecting conditions favouring equilibrium fractionation, highlighted increased air temperatures humidity levels. While readily responds temperature humidity, surface influenced more subsequent such sublimation wind-driven redistribution. Sublimation, intensified snow’s prolonged residence facilitated porosity snow, plays key role enrichment. Wind-driven redistribution, occurring 67 % winter, led homogenised depleted signal across spreading effect was especially pronounced ridge profiles, where layers showed uniform signal, stark contrast flat samples. Furthermore, distinct patterns were detected along MOSAiC route region close Samoylov Island Fram Straight near Ny-Ålesund. Snow exhibited notable seasonal variations, which indicative continental climate. In contrast, Ny-Ålesund displayed consistent fluctuations, steady

Language: Английский

Characteristics and effects of aerosols during blowing snow events in the central Arctic DOI Creative Commons
Nora Bergner, Benjamin Heutte, Ivo Beck

et al.

Elementa Science of the Anthropocene, Journal Year: 2025, Volume and Issue: 13(1)

Published: Jan. 1, 2025

Sea salt aerosol (SSaer) significantly impacts aerosol-radiation and aerosol-cloud interactions, sublimated blowing snow is hypothesized to be an important SSaer source in polar regions. Understanding other wind-sourced aerosols’ climate relevant properties needed, especially during winter when Arctic amplification greatest. However, most of our understanding comes from modeling studies, direct observations are sparse. Additionally, can originate multiple sources, making it difficult disentangle emission processes. Here, we present comprehensive events the Multidisciplinary drifting Observatory for Study Climate (MOSAiC) expedition central Arctic. High wind speed strongly enhances total number, submicron sodium chloride mass, cloud condensation nuclei concentrations, scattering coefficients. Generally, relative response enhancement strongest fall concentrations lowest. Blowing showed similar environmental across events, apart occasions with high age (>6 days since last snowfall). Coarse-mode number (>1 μm) better explained by variability averaged over 12-h air mass back trajectories arriving at MOSAiC site compared local, instantaneous speed, suggesting importance regional transport consideration history wind-driven production. These provide new insights into may help validate studies improve model parameterizations particularly indirect radiative forcing.

Language: Английский

Citations

0
Arctic Surface Snow Interactions with the Atmosphere: Spatio-Temporal Isotopic Variability During the MOSAiC Expedition DOI Creative Commons
Moein Mellat, Amy R. Macfarlane, Camilla Francesca Brunello

et al.

Published: March 20, 2024

Abstract. The Arctic Ocean’s snow cover is crucial in moderating interactions between sea-ice and the atmosphere, yet fully grasping its isotopic composition processes shaping it presents substantial challenges. This study employs a unique dataset from Multidisciplinary drifting Observatory for Study of Climate (MOSAiC) expedition to explore complex deposition post-depositional changes affecting on sea ice. By examining 911 individual isotope measurements collected over full year, we identify clear layering within snowpack: top layer, with lower δ18O values higher d-excess values, indicates fresh meteoric snowfall, while bottom affected by ice beneath, shows d- values. integrating these discrete samples continuous vapour data, our research provides insight into as well that alter signatures snow. We observe significant difference vapor during autumn, mainly due delays sampling after precipitation events, ranges suggesting impact Atlantic moisture. Winter months exhibit sharp differences indicating kinetic fractionation amid extreme cold RV Polarstern traverses Siberian sector Ocean. Conversely, summer display convergence signatures, reflecting conditions favouring equilibrium fractionation, highlighted increased air temperatures humidity levels. While readily responds temperature humidity, surface influenced more subsequent such sublimation wind-driven redistribution. Sublimation, intensified snow’s prolonged residence facilitated porosity snow, plays key role enrichment. Wind-driven redistribution, occurring 67 % winter, led homogenised depleted signal across spreading effect was especially pronounced ridge profiles, where layers showed uniform signal, stark contrast flat samples. Furthermore, distinct patterns were detected along MOSAiC route region close Samoylov Island Fram Straight near Ny-Ålesund. Snow exhibited notable seasonal variations, which indicative continental climate. In contrast, Ny-Ålesund displayed consistent fluctuations, steady

Language: Английский

Citations

0
Comment on egusphere-2024-719 DOI Creative Commons

Lijun Tian

Published: April 21, 2024

Abstract. The Arctic Ocean’s snow cover is crucial in moderating interactions between sea-ice and the atmosphere, yet fully grasping its isotopic composition processes shaping it presents substantial challenges. This study employs a unique dataset from Multidisciplinary drifting Observatory for Study of Climate (MOSAiC) expedition to explore complex deposition post-depositional changes affecting on sea ice. By examining 911 individual isotope measurements collected over full year, we identify clear layering within snowpack: top layer, with lower δ18O values higher d-excess values, indicates fresh meteoric snowfall, while bottom affected by ice beneath, shows d- d-excess values. integrating these discrete samples continuous vapour data, our research provides insight into as well that alter signatures snow. We observe significant difference vapor during autumn, mainly due delays sampling after precipitation events, ranges suggesting impact Atlantic moisture. Winter months exhibit sharp differences indicating kinetic fractionation amid extreme cold RV Polarstern traverses Siberian sector Ocean. Conversely, summer display convergence signatures, reflecting conditions favouring equilibrium fractionation, highlighted increased air temperatures humidity levels. While readily responds temperature humidity, surface influenced more subsequent such sublimation wind-driven redistribution. Sublimation, intensified snow’s prolonged residence facilitated porosity snow, plays key role enrichment. Wind-driven redistribution, occurring 67 % winter, led homogenised depleted signal across spreading effect was especially pronounced ridge profiles, where layers showed uniform signal, stark contrast flat samples. Furthermore, distinct patterns were detected along MOSAiC route region close Samoylov Island Fram Straight near Ny-Ålesund. Snow exhibited notable seasonal variations, which indicative continental climate. In contrast, Ny-Ålesund displayed consistent fluctuations, steady

Language: Английский

Citations

0
Comment on egusphere-2024-719 DOI Creative Commons
Moein Mellat, Amy R. Macfarlane, Camilla Francesca Brunello

et al.

Published: April 23, 2024

Abstract. The Arctic Ocean’s snow cover is crucial in moderating interactions between sea-ice and the atmosphere, yet fully grasping its isotopic composition processes shaping it presents substantial challenges. This study employs a unique dataset from Multidisciplinary drifting Observatory for Study of Climate (MOSAiC) expedition to explore complex deposition post-depositional changes affecting on sea ice. By examining 911 individual isotope measurements collected over full year, we identify clear layering within snowpack: top layer, with lower δ18O values higher d-excess values, indicates fresh meteoric snowfall, while bottom affected by ice beneath, shows d- d-excess values. integrating these discrete samples continuous vapour data, our research provides insight into as well that alter signatures snow. We observe significant difference vapor during autumn, mainly due delays sampling after precipitation events, ranges suggesting impact Atlantic moisture. Winter months exhibit sharp differences indicating kinetic fractionation amid extreme cold RV Polarstern traverses Siberian sector Ocean. Conversely, summer display convergence signatures, reflecting conditions favouring equilibrium fractionation, highlighted increased air temperatures humidity levels. While readily responds temperature humidity, surface influenced more subsequent such sublimation wind-driven redistribution. Sublimation, intensified snow’s prolonged residence facilitated porosity snow, plays key role enrichment. Wind-driven redistribution, occurring 67 % winter, led homogenised depleted signal across spreading effect was especially pronounced ridge profiles, where layers showed uniform signal, stark contrast flat samples. Furthermore, distinct patterns were detected along MOSAiC route region close Samoylov Island Fram Straight near Ny-Ålesund. Snow exhibited notable seasonal variations, which indicative continental climate. In contrast, Ny-Ålesund displayed consistent fluctuations, steady

Language: Английский

Citations

0
Reply on RC1 DOI Creative Commons

Moein Mellat

Published: June 7, 2024

Abstract. The Arctic Ocean’s snow cover is crucial in moderating interactions between sea-ice and the atmosphere, yet fully grasping its isotopic composition processes shaping it presents substantial challenges. This study employs a unique dataset from Multidisciplinary drifting Observatory for Study of Climate (MOSAiC) expedition to explore complex deposition post-depositional changes affecting on sea ice. By examining 911 individual isotope measurements collected over full year, we identify clear layering within snowpack: top layer, with lower δ18O values higher d-excess values, indicates fresh meteoric snowfall, while bottom affected by ice beneath, shows d- d-excess values. integrating these discrete samples continuous vapour data, our research provides insight into as well that alter signatures snow. We observe significant difference vapor during autumn, mainly due delays sampling after precipitation events, ranges suggesting impact Atlantic moisture. Winter months exhibit sharp differences indicating kinetic fractionation amid extreme cold RV Polarstern traverses Siberian sector Ocean. Conversely, summer display convergence signatures, reflecting conditions favouring equilibrium fractionation, highlighted increased air temperatures humidity levels. While readily responds temperature humidity, surface influenced more subsequent such sublimation wind-driven redistribution. Sublimation, intensified snow’s prolonged residence facilitated porosity snow, plays key role enrichment. Wind-driven redistribution, occurring 67 % winter, led homogenised depleted signal across spreading effect was especially pronounced ridge profiles, where layers showed uniform signal, stark contrast flat samples. Furthermore, distinct patterns were detected along MOSAiC route region close Samoylov Island Fram Straight near Ny-Ålesund. Snow exhibited notable seasonal variations, which indicative continental climate. In contrast, Ny-Ålesund displayed consistent fluctuations, steady

Language: Английский

Citations

0
Reply on RC2 DOI Creative Commons

Moein Mellat

Published: June 7, 2024

Abstract. The Arctic Ocean’s snow cover is crucial in moderating interactions between sea-ice and the atmosphere, yet fully grasping its isotopic composition processes shaping it presents substantial challenges. This study employs a unique dataset from Multidisciplinary drifting Observatory for Study of Climate (MOSAiC) expedition to explore complex deposition post-depositional changes affecting on sea ice. By examining 911 individual isotope measurements collected over full year, we identify clear layering within snowpack: top layer, with lower δ18O values higher d-excess values, indicates fresh meteoric snowfall, while bottom affected by ice beneath, shows d- d-excess values. integrating these discrete samples continuous vapour data, our research provides insight into as well that alter signatures snow. We observe significant difference vapor during autumn, mainly due delays sampling after precipitation events, ranges suggesting impact Atlantic moisture. Winter months exhibit sharp differences indicating kinetic fractionation amid extreme cold RV Polarstern traverses Siberian sector Ocean. Conversely, summer display convergence signatures, reflecting conditions favouring equilibrium fractionation, highlighted increased air temperatures humidity levels. While readily responds temperature humidity, surface influenced more subsequent such sublimation wind-driven redistribution. Sublimation, intensified snow’s prolonged residence facilitated porosity snow, plays key role enrichment. Wind-driven redistribution, occurring 67 % winter, led homogenised depleted signal across spreading effect was especially pronounced ridge profiles, where layers showed uniform signal, stark contrast flat samples. Furthermore, distinct patterns were detected along MOSAiC route region close Samoylov Island Fram Straight near Ny-Ålesund. Snow exhibited notable seasonal variations, which indicative continental climate. In contrast, Ny-Ålesund displayed consistent fluctuations, steady

Language: Английский

Citations

0