Radiative Forcing by Dust and Black Carbon on the Juneau Icefield, Alaska
Here we present the first known data set on black carbon (BC) and mineral dust concentrations in snow from the Juneau Icefield (JIF) in southeastern Alaska, where glacier melt rates are among the highest on Earth. In May 2016, concentrations of BC (0.4–3.1 μg/L) and dust (0.2–34 mg/L) were relativel...
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ftcwashingtonuni:oai:digitalcommons.cwu.edu:cotsfac-1109 2023-05-15T16:20:41+02:00 Radiative Forcing by Dust and Black Carbon on the Juneau Icefield, Alaska Nagorski, Sonia A. Kaspari, Susan D. Hood, Eran Fellman, Jason B. Skiles, S. McKenzie 2019-04-12T07:00:00Z application/pdf https://digitalcommons.cwu.edu/cotsfac/109 https://digitalcommons.cwu.edu/cgi/viewcontent.cgi?article=1109&context=cotsfac unknown ScholarWorks@CWU https://digitalcommons.cwu.edu/cotsfac/109 https://digitalcommons.cwu.edu/cgi/viewcontent.cgi?article=1109&context=cotsfac ©2019. American Geophysical Union. All Rights Reserved. All Faculty Scholarship for the College of the Sciences black carbon mineral dust albedo radiative forcing Juneau Icefield Climate Geology text 2019 ftcwashingtonuni 2022-10-20T20:28:52Z Here we present the first known data set on black carbon (BC) and mineral dust concentrations in snow from the Juneau Icefield (JIF) in southeastern Alaska, where glacier melt rates are among the highest on Earth. In May 2016, concentrations of BC (0.4–3.1 μg/L) and dust (0.2–34 mg/L) were relatively low and decreased toward the interior of the JIF. The associated radiative forcing (RF) averaged 4 W/m2. In July, after 10 weeks of exposure, the aged snow surface had substantially higher concentrations of BC (2.1–14.8 μg/L) and dust (11–72 mg/L) that were not spatially distributed by elevation or distance from the coast. RF by dust and BC ranged from 70 to 130 W/m2 (87 W/m2 average) across the JIF in July, and RF was dominated by dust. The associated median snow water equivalent reduction in the July samples is estimated at 10–18 mm/day, potentially advancing melt on the scale of days to weeks. Aging of the snow surface in summer likely resulted in a positive feedback of melt consolidation, enhanced solar absorption and melting, and further concentration of surface particles. Regional projections of warming temperatures and increased rain at the expense of snow make it likely that summer season darkening will become a more important contributor to the high melt rates on the JIF. Further studies are needed to elucidate the spatiotemporal occurrence of various light‐absorbing particles on the JIF, and models of ice field wastage should incorporate their associated RF. Text glacier Alaska Central Washington University: ScholarWorks Juneau Icefield ENVELOPE(-134.254,-134.254,58.916,58.916) |
institution |
Open Polar |
collection |
Central Washington University: ScholarWorks |
op_collection_id |
ftcwashingtonuni |
language |
unknown |
topic |
black carbon mineral dust albedo radiative forcing Juneau Icefield Climate Geology |
spellingShingle |
black carbon mineral dust albedo radiative forcing Juneau Icefield Climate Geology Nagorski, Sonia A. Kaspari, Susan D. Hood, Eran Fellman, Jason B. Skiles, S. McKenzie Radiative Forcing by Dust and Black Carbon on the Juneau Icefield, Alaska |
topic_facet |
black carbon mineral dust albedo radiative forcing Juneau Icefield Climate Geology |
description |
Here we present the first known data set on black carbon (BC) and mineral dust concentrations in snow from the Juneau Icefield (JIF) in southeastern Alaska, where glacier melt rates are among the highest on Earth. In May 2016, concentrations of BC (0.4–3.1 μg/L) and dust (0.2–34 mg/L) were relatively low and decreased toward the interior of the JIF. The associated radiative forcing (RF) averaged 4 W/m2. In July, after 10 weeks of exposure, the aged snow surface had substantially higher concentrations of BC (2.1–14.8 μg/L) and dust (11–72 mg/L) that were not spatially distributed by elevation or distance from the coast. RF by dust and BC ranged from 70 to 130 W/m2 (87 W/m2 average) across the JIF in July, and RF was dominated by dust. The associated median snow water equivalent reduction in the July samples is estimated at 10–18 mm/day, potentially advancing melt on the scale of days to weeks. Aging of the snow surface in summer likely resulted in a positive feedback of melt consolidation, enhanced solar absorption and melting, and further concentration of surface particles. Regional projections of warming temperatures and increased rain at the expense of snow make it likely that summer season darkening will become a more important contributor to the high melt rates on the JIF. Further studies are needed to elucidate the spatiotemporal occurrence of various light‐absorbing particles on the JIF, and models of ice field wastage should incorporate their associated RF. |
format |
Text |
author |
Nagorski, Sonia A. Kaspari, Susan D. Hood, Eran Fellman, Jason B. Skiles, S. McKenzie |
author_facet |
Nagorski, Sonia A. Kaspari, Susan D. Hood, Eran Fellman, Jason B. Skiles, S. McKenzie |
author_sort |
Nagorski, Sonia A. |
title |
Radiative Forcing by Dust and Black Carbon on the Juneau Icefield, Alaska |
title_short |
Radiative Forcing by Dust and Black Carbon on the Juneau Icefield, Alaska |
title_full |
Radiative Forcing by Dust and Black Carbon on the Juneau Icefield, Alaska |
title_fullStr |
Radiative Forcing by Dust and Black Carbon on the Juneau Icefield, Alaska |
title_full_unstemmed |
Radiative Forcing by Dust and Black Carbon on the Juneau Icefield, Alaska |
title_sort |
radiative forcing by dust and black carbon on the juneau icefield, alaska |
publisher |
ScholarWorks@CWU |
publishDate |
2019 |
url |
https://digitalcommons.cwu.edu/cotsfac/109 https://digitalcommons.cwu.edu/cgi/viewcontent.cgi?article=1109&context=cotsfac |
long_lat |
ENVELOPE(-134.254,-134.254,58.916,58.916) |
geographic |
Juneau Icefield |
geographic_facet |
Juneau Icefield |
genre |
glacier Alaska |
genre_facet |
glacier Alaska |
op_source |
All Faculty Scholarship for the College of the Sciences |
op_relation |
https://digitalcommons.cwu.edu/cotsfac/109 https://digitalcommons.cwu.edu/cgi/viewcontent.cgi?article=1109&context=cotsfac |
op_rights |
©2019. American Geophysical Union. All Rights Reserved. |
_version_ |
1766008636839034880 |