Vertical profiles of light absorption and scattering associated with black carbon particle fractions in the springtime Arctic above 79° N
Despite the potential importance of black carbon (BC) for radiative forcing of the Arctic atmosphere, vertically resolved measurements of the particle light scattering coefficient (σ sp ) and light absorption coefficient (σ ap ) in the springtime Arctic atmosphere are infrequent, especially measurem...
Published in: | Atmospheric Chemistry and Physics |
---|---|
Main Authors: | , , , , , , , , , , , , , , , , , |
Language: | unknown |
Published: |
2023
|
Subjects: | |
Online Access: | http://www.osti.gov/servlets/purl/1671742 https://www.osti.gov/biblio/1671742 https://doi.org/10.5194/acp-20-10545-2020 |
id |
ftosti:oai:osti.gov:1671742 |
---|---|
record_format |
openpolar |
spelling |
ftosti:oai:osti.gov:1671742 2023-07-30T03:55:41+02:00 Vertical profiles of light absorption and scattering associated with black carbon particle fractions in the springtime Arctic above 79° N Leaitch, W. Richard Kodros, John K. Willis, Megan D. Hanna, Sarah Schulz, Hannes Andrews, Elisabeth Bozem, Heiko Burkart, Julia Hoor, Peter Kolonjari, Felicia Ogren, John A. Sharma, Sangeeta Si, Meng von Salzen, Knut Bertram, Allan K. Herber, Andreas Abbatt, Jonathan D. Pierce, Jeffrey R. 2023-07-03 application/pdf http://www.osti.gov/servlets/purl/1671742 https://www.osti.gov/biblio/1671742 https://doi.org/10.5194/acp-20-10545-2020 unknown http://www.osti.gov/servlets/purl/1671742 https://www.osti.gov/biblio/1671742 https://doi.org/10.5194/acp-20-10545-2020 doi:10.5194/acp-20-10545-2020 54 ENVIRONMENTAL SCIENCES 2023 ftosti https://doi.org/10.5194/acp-20-10545-2020 2023-07-11T09:48:09Z Despite the potential importance of black carbon (BC) for radiative forcing of the Arctic atmosphere, vertically resolved measurements of the particle light scattering coefficient (σ sp ) and light absorption coefficient (σ ap ) in the springtime Arctic atmosphere are infrequent, especially measurements at latitudes at or above 80° N. Here, relationships among vertically distributed aerosol optical properties (σap, σsp and single scattering albedo or SSA), particle microphysics and particle chemistry are examined for a region of the Canadian archipelago between 79.9 and 83.4° N from near the surface to 50 hPa. Airborne data collected during April 2015 are combined with ground-based observations from the observatory at Alert, Nunavut and simulations from the Goddard Earth Observing System (GEOS) model, GEOS-Chem, coupled with the TwO-Moment Aerosol Sectional (TOMAS) model (collectively GEOS-Chem–TOMAS; Kodros et al., 2018) to further our knowledge of the effects of BC on light absorption in the Arctic troposphere. The results are constrained for σsp less than 15 Mm -1 , which represent 98% of the observed σsp, because the single scattering albedo (SSA) has a tendency to be lower at lower σsp, resulting in a larger relative contribution to Arctic warming. At 18.4 m 2 g -1 , the average BC mass absorption coefficient (MAC) from the combined airborne and Alert observations is substantially higher than the two averaged modelled MAC values (13.6 and 9.1 m2 g -1 ) for two different internal mixing assumptions, the latter of which is based on previous observations. The higher observed MAC value may be explained by an underestimation of BC, the presence of small amounts of dust and/or possible differences in BC microphysics and morphologies between the observations and model. In comparing the observations and simulations, we present σap and SSA, as measured, and σ ap 2 and the corresponding SSA to encompass the lower modelled MAC that is more consistent with accepted MAC values. Median values of the measured σap, rBC and ... Other/Unknown Material albedo Arctic black carbon Canadian Archipelago Nunavut SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Arctic Nunavut Atmospheric Chemistry and Physics 20 17 10545 10563 |
institution |
Open Polar |
collection |
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
unknown |
topic |
54 ENVIRONMENTAL SCIENCES |
spellingShingle |
54 ENVIRONMENTAL SCIENCES Leaitch, W. Richard Kodros, John K. Willis, Megan D. Hanna, Sarah Schulz, Hannes Andrews, Elisabeth Bozem, Heiko Burkart, Julia Hoor, Peter Kolonjari, Felicia Ogren, John A. Sharma, Sangeeta Si, Meng von Salzen, Knut Bertram, Allan K. Herber, Andreas Abbatt, Jonathan D. Pierce, Jeffrey R. Vertical profiles of light absorption and scattering associated with black carbon particle fractions in the springtime Arctic above 79° N |
topic_facet |
54 ENVIRONMENTAL SCIENCES |
description |
Despite the potential importance of black carbon (BC) for radiative forcing of the Arctic atmosphere, vertically resolved measurements of the particle light scattering coefficient (σ sp ) and light absorption coefficient (σ ap ) in the springtime Arctic atmosphere are infrequent, especially measurements at latitudes at or above 80° N. Here, relationships among vertically distributed aerosol optical properties (σap, σsp and single scattering albedo or SSA), particle microphysics and particle chemistry are examined for a region of the Canadian archipelago between 79.9 and 83.4° N from near the surface to 50 hPa. Airborne data collected during April 2015 are combined with ground-based observations from the observatory at Alert, Nunavut and simulations from the Goddard Earth Observing System (GEOS) model, GEOS-Chem, coupled with the TwO-Moment Aerosol Sectional (TOMAS) model (collectively GEOS-Chem–TOMAS; Kodros et al., 2018) to further our knowledge of the effects of BC on light absorption in the Arctic troposphere. The results are constrained for σsp less than 15 Mm -1 , which represent 98% of the observed σsp, because the single scattering albedo (SSA) has a tendency to be lower at lower σsp, resulting in a larger relative contribution to Arctic warming. At 18.4 m 2 g -1 , the average BC mass absorption coefficient (MAC) from the combined airborne and Alert observations is substantially higher than the two averaged modelled MAC values (13.6 and 9.1 m2 g -1 ) for two different internal mixing assumptions, the latter of which is based on previous observations. The higher observed MAC value may be explained by an underestimation of BC, the presence of small amounts of dust and/or possible differences in BC microphysics and morphologies between the observations and model. In comparing the observations and simulations, we present σap and SSA, as measured, and σ ap 2 and the corresponding SSA to encompass the lower modelled MAC that is more consistent with accepted MAC values. Median values of the measured σap, rBC and ... |
author |
Leaitch, W. Richard Kodros, John K. Willis, Megan D. Hanna, Sarah Schulz, Hannes Andrews, Elisabeth Bozem, Heiko Burkart, Julia Hoor, Peter Kolonjari, Felicia Ogren, John A. Sharma, Sangeeta Si, Meng von Salzen, Knut Bertram, Allan K. Herber, Andreas Abbatt, Jonathan D. Pierce, Jeffrey R. |
author_facet |
Leaitch, W. Richard Kodros, John K. Willis, Megan D. Hanna, Sarah Schulz, Hannes Andrews, Elisabeth Bozem, Heiko Burkart, Julia Hoor, Peter Kolonjari, Felicia Ogren, John A. Sharma, Sangeeta Si, Meng von Salzen, Knut Bertram, Allan K. Herber, Andreas Abbatt, Jonathan D. Pierce, Jeffrey R. |
author_sort |
Leaitch, W. Richard |
title |
Vertical profiles of light absorption and scattering associated with black carbon particle fractions in the springtime Arctic above 79° N |
title_short |
Vertical profiles of light absorption and scattering associated with black carbon particle fractions in the springtime Arctic above 79° N |
title_full |
Vertical profiles of light absorption and scattering associated with black carbon particle fractions in the springtime Arctic above 79° N |
title_fullStr |
Vertical profiles of light absorption and scattering associated with black carbon particle fractions in the springtime Arctic above 79° N |
title_full_unstemmed |
Vertical profiles of light absorption and scattering associated with black carbon particle fractions in the springtime Arctic above 79° N |
title_sort |
vertical profiles of light absorption and scattering associated with black carbon particle fractions in the springtime arctic above 79° n |
publishDate |
2023 |
url |
http://www.osti.gov/servlets/purl/1671742 https://www.osti.gov/biblio/1671742 https://doi.org/10.5194/acp-20-10545-2020 |
geographic |
Arctic Nunavut |
geographic_facet |
Arctic Nunavut |
genre |
albedo Arctic black carbon Canadian Archipelago Nunavut |
genre_facet |
albedo Arctic black carbon Canadian Archipelago Nunavut |
op_relation |
http://www.osti.gov/servlets/purl/1671742 https://www.osti.gov/biblio/1671742 https://doi.org/10.5194/acp-20-10545-2020 doi:10.5194/acp-20-10545-2020 |
op_doi |
https://doi.org/10.5194/acp-20-10545-2020 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
20 |
container_issue |
17 |
container_start_page |
10545 |
op_container_end_page |
10563 |
_version_ |
1772821201923604480 |