Characterization of transport regimes and the polar dome during Arctic spring and summer using in situ aircraft measurements

Bozem, Heiko; Hoor, Peter; Kunkel, Daniel; Köllner, Franziska; Schneider, Johannes; Herber, Andreas; Schulz, Hannes; Leaitch, W. R.; Aliabadi, Amir A.; Willis, Megan D.; Burkart, Julia; Abbatt, Jonathan P. D.

doi:10.5194/acp-19-15049-2019

Cited by 38 publications

(61 citation statements)

References 83 publications

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“…Turbulent exchange and deposition were reduced during winter as the meteorological conditions in the Arctic were stable and dry (Bradley et al, 1992;Bozem et al, 2019;Law and Stohl, 2007). In addition, BC emissions in EAS, EUR, and RBU regions showed obvious monthly changes with higher emissions from November to March as mentioned earlier (Section 2.1.1), leading to the relatively high BC concentrations over the polar sea ice region in winter.…”

Section: Near-surface Bc Concentrations In the Arcticmentioning

confidence: 75%

“…The coverage of the polar dome expanded more southward in winter (Bozem et al, 2019;Law and Stohl, 2007), allowing more BC from lower latitudinal regions to be transported into the Arctic.…”

Section: Near-surface Bc Concentrations In the Arcticmentioning

confidence: 99%

“…On one hand, the BC emission reductions in EAS were the largest among the six source regions (Table 1). On the other hand, BC emission reductions in EAS can influence the Arctic lower troposphere via two pathways (Bozem et al, 2019;Stohl, 2006).…”

Section: Near-surface Bc Concentrations In the Arcticmentioning

confidence: 99%

“…over Eurasia in winter as the temperature difference of different latitudes became smaller (Bozem et al, 2019;Law and Stohl, 2007), resulting in the contribution of EAS to the Arctic BC concentrations in upper troposphere only peak in summer at 13 th layer (8.0 km a.s.l.) with the value of 0.5 ng m -3 .…”

Section: Contributions Of Regional Emission Reductions To the Verticamentioning

confidence: 99%

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Responses of Arctic Black Carbon and Surface Temperature to Multi-Region Emission Reductions: an HTAP2 Ensemble Modeling Study

Zhao

Dong

et al. 2020

Preprint

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Abstract. Black carbon (BC) emissions play an important role in regional climate change of the Arctic. It is necessary to pay attention to the impact of long-range transport from regions outside the Arctic as BC emissions from local sources in the Arctic were relatively small. The Task Force Hemispheric Transport of Air Pollution Phase2 (HTAP2) set up a series of simulation scenarios to investigate the response of BC in a given region to different source regions. This study investigated the responses of Arctic BC concentrations and surface temperature to 20 % anthropogenic emission reductions from six regions in 2010 within the framework of HTAP2 based on ensemble modeling results. It was found that the emissions from East Asia (EAS) had most (18.1 %–51.4 %) significant impact on the Arctic while the monthly contributions from Europe, Middle East, North America, Russia Belarus Ukraine, and South Asia were 20.1 %–49.9 %, 0.02 %–0.9 %, 8.3 %–19.3 %, 5.4 %–18.1 %, and 3.1 %–7.7 %, respectively. The responses of the vertical profiles of the Arctic BC to the six regions were found to be different due to multiple transport pathways. The response of the Arctic BC to emission reductions of six source regions became less significant with the increase of the latitude. The benefit of BC emission reductions in terms of slowing down surface warming in the Arctic was evaluated by using Absolute Regional Temperature-change Potential (ARTP). Compared to the response of global temperature to BC emission reductions, the response of Arctic temperature was substantially more sensitive, highlighting the need for curbing global BC emissions.

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Section: Near-surface Bc Concentrations In the Arcticmentioning

confidence: 75%

Section: Near-surface Bc Concentrations In the Arcticmentioning

confidence: 99%

Section: Near-surface Bc Concentrations In the Arcticmentioning

confidence: 99%

Section: Contributions Of Regional Emission Reductions To the Verticamentioning

confidence: 99%

See 2 more Smart Citations

Responses of Arctic Black Carbon and Surface Temperature to Multi-Region Emission Reductions: an HTAP2 Ensemble Modeling Study

Zhao

Dong

et al. 2020

Preprint

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“…emissions within the Arctic as a result of greater anthropogenic demand for heating (Huang et al, 2015;Stohl et al, 2013;Yttri et al, 2014), the southward expansion of the Arctic front (Bozem et al, 2019), and an increase in EC atmospheric lifetime due to inefficient scavenging during cold and stagnant atmospheric conditions (Mouteva et al, 2017;Thomas et al, 2019).…”

Section: 1029/2020jd033125mentioning

confidence: 99%

Seasonal Cycle of Isotope‐Based Source Apportionment of Elemental Carbon in Airborne Particulate Matter and Snow at Alert, Canada

et al. 2020

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Elemental carbon (EC) is a major light-absorbing component of atmospheric aerosol particles. Here, we report the seasonal variation in EC concentrations and sources in airborne particulate matter (PM) and snow at Alert, Canada, from March 2014 to June 2015. We isolated the EC fraction with the EnCan-Total-900 (ECT9) protocol and quantified its stable carbon isotope composition (δ 13 C) and radiocarbon content (Δ 14 C) to apportion EC into contributions from fossil fuel combustion and biomass burning (wildfires and biofuel combustion). Ten-day backward trajectories show EC aerosols reaching Alert by traveling over the Arctic Ocean from the Russian Arctic during winter and from North America (>40°N) during summer. EC concentrations range from 1.8-135.3 ng C m −3 air (1.9-41.2% of total carbon [TC], n = 48), with lowest values in summer (1.8-44.5 ng C m −3 air, n = 9). EC in PM (Δ 14 C =-532 ± 114‰ [ave. ± SD, n = 20]) and snow (−257 ± 131‰, n = 7) was depleted in 14 C relative to current ambient CO 2 year-round. EC in PM mainly originated from liquid and solid fossil fuels from fall to spring (47-70% fossil), but had greater contributions from biomass burning in summer (48-80% modern carbon). EC in snow was mostly from biomass burning (53-88%). Our data show that biomass burning EC is preferentially incorporated into snow because of scavenging processes within the Arctic atmosphere or long-range transport in storm systems. This work provides a comprehensive view of EC particles captured in the High Arctic through wet and dry deposition and demonstrates that surface stations monitoring EC in PM might underestimate biomass burning and transport. Plain Language Summary Elemental carbon (EC) aerosols are produced during combustion processes and impact Arctic climate because they absorb light, warm the atmosphere, and accelerate snow and ice melt. Here, we measured the concentration and isotopic composition of EC suspended in the atmosphere and in snow at Alert, Canada, between March 2014 and May 2015. We found that concentrations were lowest during the summer and increased throughout the winter and early spring. This pattern is typical, because EC is removed from the atmosphere by precipitation, which happens more frequently during summer. Our isotope data and meteorological analyses revealed that fossil fuel burning in the Russian Arctic was an important source of EC to Alert from September to May, while forest fires in the North American boreal region were major sources of EC during the summer. We also found that snow contained a greater proportion of EC derived from biomass burning than the suspended aerosols. Snow might be preferentially capturing biomass burning EC from the local atmosphere or be transporting them to the Arctic from lower latitudes. Since EC surface observing networks routinely measure EC in PM but not snow, the impact of biomass burning EC sources on Arctic climate might be underestimated.

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A local marine source of atmospheric particles in the High Arctic

Nøjgaard

Peker²,

Pernov³

et al. 2022

Atmospheric Environment

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Characterization of transport regimes and the polar dome during Arctic spring and summer using in situ aircraft measurements

Abstract: The springtime composition

Cited by 38 publications

References 83 publications

Responses of Arctic Black Carbon and Surface Temperature to Multi-Region Emission Reductions: an HTAP2 Ensemble Modeling Study

Responses of Arctic Black Carbon and Surface Temperature to Multi-Region Emission Reductions: an HTAP2 Ensemble Modeling Study

Seasonal Cycle of Isotope‐Based Source Apportionment of Elemental Carbon in Airborne Particulate Matter and Snow at Alert, Canada

A local marine source of atmospheric particles in the High Arctic

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