Moisture Transformation in Warm Air Intrusions Into the Arctic: Process Attribution With Stable Water Isotopes DOI Creative Commons
Camilla Francesca Brunello, Florian Gebhardt, Annette Rinke

et al.

Geophysical Research Letters, Journal Year: 2024, Volume and Issue: 51(21)

Published: Oct. 29, 2024

Abstract Warm Airmass Intrusions (WAIs) from the mid‐latitudes significantly impact Arctic water budget. Here, we combine vapor isotope measurements MOSAiC expedition, with a Lagrangian‐based process attribution diagnostic to track moisture transformation in central Ocean during two WAIs, under contrasting sea‐ice concentrations (SIC). During winter high SIC, supplies are identified. The first is moisture, locally‐sourced over sea ice, isotopic composition influenced by kinetic fractionation ice‐cloud formation and deposition. This rapidly overprinted low‐latitude advected poleward WAI. In summer low supplied through evaporation land ocean, removal via liquid‐cloud dew formation. reflects influence of higher relative humidity at sites. Given projected increase frequency duration our study contributes assessing changes cycle.

Language: Английский

An overview of the vertical structure of the atmospheric boundary layer in the central Arctic during MOSAiC DOI Creative Commons

Gina Jozef,

John J. Cassano, Sandro Dahlke

et al.

Atmospheric chemistry and physics, Journal Year: 2024, Volume and Issue: 24(2), P. 1429 - 1450

Published: Jan. 30, 2024

Abstract. Observations collected during the Multidisciplinary drifting Observatory for Study of Arctic Climate (MOSAiC) provide an annual cycle vertical thermodynamic and kinematic structure atmospheric boundary layer (ABL) in central Arctic. A self-organizing map (SOM) analysis conducted using radiosonde observations shows a range ABL from very shallow stable, with strong surface-based virtual potential temperature (θv) inversion, to deep near neutral, capped by weak elevated θv inversion. The patterns identified SOM allowed derivation criteria categorize stability within just above ABL, which revealed that MOSAiC was stable neutral similar frequencies, there always inversion lowest 1 km, usually had moderate stability. In conjunction additional measurement platforms, including 10 m meteorological tower, ceilometer, microwave radiometer, insight into relationships between stability, as well variety features. low-level jet observed 76 % radiosondes, stronger winds (LLJ) core located more closely corresponding weaker Wind shear found decrease, friction velocity increase, decreasing Clouds were 30 min preceding launch 64 time. These typically low clouds, where high clouds or no largely coincided ABL.

Language: Английский

Citations

6
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
The nonlinear effect of atmospheric conditions on middle-school students’ travel mode choices DOI
Dawei Wu, Lu Ma, Xuedong Yan

et al.

Transportation Research Part D Transport and Environment, Journal Year: 2024, Volume and Issue: 135, P. 104382 - 104382

Published: Aug. 29, 2024

Language: Английский

Citations

3
Evaluation of the Coupled Arctic Forecast System’s representation of the Arctic atmospheric boundary layer vertical structure during MOSAiC DOI Creative Commons

Gina Jozef,

John J. Cassano, Amy Solomon

et al.

Elementa Science of the Anthropocene, Journal Year: 2024, Volume and Issue: 12(1)

Published: Jan. 1, 2024

Observations from the Multidisciplinary drifting Observatory for Study of Arctic Climate (MOSAiC) were used to evaluate Coupled Forecast System (CAFS) model’s ability simulate atmospheric boundary layer (ABL) structure in central Arctic. MOSAiC observations lower atmosphere radiosondes, downwelling longwave radiation (LWD) a pyranometer, and near-surface wind conditions meteorological tower compared 6-hourly CAFS output. A self-organizing map (SOM) analysis reveals that reproduces range stability structures identified by SOM trained with virtual potential temperature (θv) profiles, but not necessarily correct frequency or at time. Additionally, speed profiles corresponding particular θv profile are consistent between observations. When categorizing static stability, it was revealed simulates all observed regimes, overrepresents strong underrepresents top ABL 1 km. The 10 m speeds each regime consistently have larger values versus observed, this offset increases decreasing stability. Whether LWD is over underestimated dependent on regime. Both variables most greatly overestimated spring, leading largest bias, greatest underrepresentation spring. results article serve highlight positive aspects representing reveal impacts misrepresentations physical processes dictating energy, moisture, momentum transfer troposphere simulation This highlights areas improvement other numerical weather prediction models. SOM-based especially provides unique opportunity process-based model evaluation.

Language: Английский

Citations

0
Moisture Transformation in Warm Air Intrusions Into the Arctic: Process Attribution With Stable Water Isotopes DOI Creative Commons
Camilla Francesca Brunello, Florian Gebhardt, Annette Rinke

et al.

Geophysical Research Letters, Journal Year: 2024, Volume and Issue: 51(21)

Published: Oct. 29, 2024

Abstract Warm Airmass Intrusions (WAIs) from the mid‐latitudes significantly impact Arctic water budget. Here, we combine vapor isotope measurements MOSAiC expedition, with a Lagrangian‐based process attribution diagnostic to track moisture transformation in central Ocean during two WAIs, under contrasting sea‐ice concentrations (SIC). During winter high SIC, supplies are identified. The first is moisture, locally‐sourced over sea ice, isotopic composition influenced by kinetic fractionation ice‐cloud formation and deposition. This rapidly overprinted low‐latitude advected poleward WAI. In summer low supplied through evaporation land ocean, removal via liquid‐cloud dew formation. reflects influence of higher relative humidity at sites. Given projected increase frequency duration our study contributes assessing changes cycle.

Language: Английский

Citations

0