Seasonality of aerosol optical properties in the Arctic
Given the sensitivity of the Arctic climate to short-lived climate forcers, long-term in situ surface measurements of aerosol parameters are useful in gaining insight into the magnitude and variability of these climate forcings. Seasonality of aerosol optical properties – including the aerosol light...
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ftcopernicus:oai:publications.copernicus.org:acp63739 2023-05-15T13:10:49+02:00 Seasonality of aerosol optical properties in the Arctic Schmeisser, Lauren Backman, John Ogren, John A. Andrews, Elisabeth Asmi, Eija Starkweather, Sandra Uttal, Taneil Fiebig, Markus Sharma, Sangeeta Eleftheriadis, Kostas Vratolis, Stergios Bergin, Michael Tunved, Peter Jefferson, Anne 2019-02-07 application/pdf https://doi.org/10.5194/acp-18-11599-2018 https://www.atmos-chem-phys.net/18/11599/2018/ eng eng doi:10.5194/acp-18-11599-2018 https://www.atmos-chem-phys.net/18/11599/2018/ eISSN: 1680-7324 Text 2019 ftcopernicus https://doi.org/10.5194/acp-18-11599-2018 2019-12-24T09:50:00Z Given the sensitivity of the Arctic climate to short-lived climate forcers, long-term in situ surface measurements of aerosol parameters are useful in gaining insight into the magnitude and variability of these climate forcings. Seasonality of aerosol optical properties – including the aerosol light-scattering coefficient, absorption coefficient, single-scattering albedo, scattering Ångström exponent, and asymmetry parameter – are presented for six monitoring sites throughout the Arctic: Alert, Canada; Barrow, USA; Pallas, Finland; Summit, Greenland; Tiksi, Russia; and Zeppelin Mountain, Ny-Ålesund, Svalbard, Norway. Results show annual variability in all parameters, though the seasonality of each aerosol optical property varies from site to site. There is a large diversity in magnitude and variability of scattering coefficient at all sites, reflecting differences in aerosol source, transport, and removal at different locations throughout the Arctic. Of the Arctic sites, the highest annual mean scattering coefficient is measured at Tiksi (12.47 Mm −1 ), and the lowest annual mean scattering coefficient is measured at Summit (1.74 Mm −1 ). At most sites, aerosol absorption peaks in the winter and spring, and has a minimum throughout the Arctic in the summer, indicative of the Arctic haze phenomenon; however, nuanced variations in seasonalities suggest that this phenomenon is not identically observed in all regions of the Arctic. The highest annual mean absorption coefficient is measured at Pallas (0.48 Mm −1 ), and Summit has the lowest annual mean absorption coefficient (0.12 Mm −1 ). At the Arctic monitoring stations analyzed here, mean annual single-scattering albedo ranges from 0.909 (at Pallas) to 0.960 (at Barrow), the mean annual scattering Ångström exponent ranges from 1.04 (at Barrow) to 1.80 (at Summit), and the mean asymmetry parameter ranges from 0.57 (at Alert) to 0.75 (at Summit). Systematic variability of aerosol optical properties in the Arctic supports the notion that the sites presented here measure a variety of aerosol populations, which also experience different removal mechanisms. A robust conclusion from the seasonal cycles presented is that the Arctic cannot be treated as one common and uniform environment but rather is a region with ample spatiotemporal variability in aerosols. This notion is important in considering the design or aerosol monitoring networks in the region and is important for informing climate models to better represent short-lived aerosol climate forcers in order to yield more accurate climate predictions for the Arctic. Text albedo Arctic Greenland Ny Ålesund Ny-Ålesund Svalbard Tiksi Copernicus Publications: E-Journals Arctic Canada Greenland Norway Ny-Ålesund Svalbard Tiksi ENVELOPE(128.867,128.867,71.633,71.633) Atmospheric Chemistry and Physics 18 16 11599 11622 |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
Given the sensitivity of the Arctic climate to short-lived climate forcers, long-term in situ surface measurements of aerosol parameters are useful in gaining insight into the magnitude and variability of these climate forcings. Seasonality of aerosol optical properties – including the aerosol light-scattering coefficient, absorption coefficient, single-scattering albedo, scattering Ångström exponent, and asymmetry parameter – are presented for six monitoring sites throughout the Arctic: Alert, Canada; Barrow, USA; Pallas, Finland; Summit, Greenland; Tiksi, Russia; and Zeppelin Mountain, Ny-Ålesund, Svalbard, Norway. Results show annual variability in all parameters, though the seasonality of each aerosol optical property varies from site to site. There is a large diversity in magnitude and variability of scattering coefficient at all sites, reflecting differences in aerosol source, transport, and removal at different locations throughout the Arctic. Of the Arctic sites, the highest annual mean scattering coefficient is measured at Tiksi (12.47 Mm −1 ), and the lowest annual mean scattering coefficient is measured at Summit (1.74 Mm −1 ). At most sites, aerosol absorption peaks in the winter and spring, and has a minimum throughout the Arctic in the summer, indicative of the Arctic haze phenomenon; however, nuanced variations in seasonalities suggest that this phenomenon is not identically observed in all regions of the Arctic. The highest annual mean absorption coefficient is measured at Pallas (0.48 Mm −1 ), and Summit has the lowest annual mean absorption coefficient (0.12 Mm −1 ). At the Arctic monitoring stations analyzed here, mean annual single-scattering albedo ranges from 0.909 (at Pallas) to 0.960 (at Barrow), the mean annual scattering Ångström exponent ranges from 1.04 (at Barrow) to 1.80 (at Summit), and the mean asymmetry parameter ranges from 0.57 (at Alert) to 0.75 (at Summit). Systematic variability of aerosol optical properties in the Arctic supports the notion that the sites presented here measure a variety of aerosol populations, which also experience different removal mechanisms. A robust conclusion from the seasonal cycles presented is that the Arctic cannot be treated as one common and uniform environment but rather is a region with ample spatiotemporal variability in aerosols. This notion is important in considering the design or aerosol monitoring networks in the region and is important for informing climate models to better represent short-lived aerosol climate forcers in order to yield more accurate climate predictions for the Arctic. |
format |
Text |
author |
Schmeisser, Lauren Backman, John Ogren, John A. Andrews, Elisabeth Asmi, Eija Starkweather, Sandra Uttal, Taneil Fiebig, Markus Sharma, Sangeeta Eleftheriadis, Kostas Vratolis, Stergios Bergin, Michael Tunved, Peter Jefferson, Anne |
spellingShingle |
Schmeisser, Lauren Backman, John Ogren, John A. Andrews, Elisabeth Asmi, Eija Starkweather, Sandra Uttal, Taneil Fiebig, Markus Sharma, Sangeeta Eleftheriadis, Kostas Vratolis, Stergios Bergin, Michael Tunved, Peter Jefferson, Anne Seasonality of aerosol optical properties in the Arctic |
author_facet |
Schmeisser, Lauren Backman, John Ogren, John A. Andrews, Elisabeth Asmi, Eija Starkweather, Sandra Uttal, Taneil Fiebig, Markus Sharma, Sangeeta Eleftheriadis, Kostas Vratolis, Stergios Bergin, Michael Tunved, Peter Jefferson, Anne |
author_sort |
Schmeisser, Lauren |
title |
Seasonality of aerosol optical properties in the Arctic |
title_short |
Seasonality of aerosol optical properties in the Arctic |
title_full |
Seasonality of aerosol optical properties in the Arctic |
title_fullStr |
Seasonality of aerosol optical properties in the Arctic |
title_full_unstemmed |
Seasonality of aerosol optical properties in the Arctic |
title_sort |
seasonality of aerosol optical properties in the arctic |
publishDate |
2019 |
url |
https://doi.org/10.5194/acp-18-11599-2018 https://www.atmos-chem-phys.net/18/11599/2018/ |
long_lat |
ENVELOPE(128.867,128.867,71.633,71.633) |
geographic |
Arctic Canada Greenland Norway Ny-Ålesund Svalbard Tiksi |
geographic_facet |
Arctic Canada Greenland Norway Ny-Ålesund Svalbard Tiksi |
genre |
albedo Arctic Greenland Ny Ålesund Ny-Ålesund Svalbard Tiksi |
genre_facet |
albedo Arctic Greenland Ny Ålesund Ny-Ålesund Svalbard Tiksi |
op_source |
eISSN: 1680-7324 |
op_relation |
doi:10.5194/acp-18-11599-2018 https://www.atmos-chem-phys.net/18/11599/2018/ |
op_doi |
https://doi.org/10.5194/acp-18-11599-2018 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
18 |
container_issue |
16 |
container_start_page |
11599 |
op_container_end_page |
11622 |
_version_ |
1766244052253016064 |