Controls on surface aerosol particle number concentrations and aerosol-limited cloud regimes over the central Greenland Ice Sheet

Guy, Heather; Brooks, Ian M.; Carslaw, Ken S.; Murray, Benjamin J.; Walden, Von P.; Shupe, Matthew D.; Pettersen, Claire; Turner, David D.; Cox, Christopher J.; Neff, William D.; Bennartz, Ralf; Neely III, Ryan R.

doi:10.5194/acp-21-15351-2021

i

Controls on surface aerosol particle number concentrations and aerosol-limited cloud regimes over the central Greenland Ice Sheet

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2021
By Guy, Heather ; Brooks, Ian M. ; Carslaw, Ken S. ; ...

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Journal Title:

Atmospheric Chemistry and Physics
Personal Author:

Guy, Heather ; Brooks, Ian M. ; Carslaw, Ken S. ; Murray, Benjamin J. ; Walden, Von P. ; Shupe, Matthew D. ; Pettersen, Claire ; Turner, David D. ; Cox, Christopher J. ; Neff, William D. ; Bennartz, Ralf ; Neely III, Ryan R.
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; GSL (Global Systems Laboratory) ; PSL (Physical Sciences Laboratory) ; CIRES (Cooperative Institute for Research in Environmental Sciences)
Description:

This study presents the first full annual cycle (2019–2020) of ambient surface aerosol particle number concentration measurements (condensation nuclei > 20 nm, N20) collected at Summit Station (Summit), in the centre of the Greenland Ice Sheet (72.58∘ N, −38.45∘ E; 3250 ma.s.l.). The mean surface concentration in 2019 was 129 cm−3, with the 6 h mean ranging between 1 and 1441 cm−3. The highest monthly mean concentrations occurred during the late spring and summer, with the minimum concentrations occurring in February (mean: 18 cm−3). High-N20 events are linked to anomalous anticyclonic circulation over Greenland and the descent of free-tropospheric aerosol down to the surface, whereas low-N20 events are linked to anomalous cyclonic circulation over south-east Greenland that drives upslope flow and enhances precipitation en route to Summit. Fog strongly affects particle number concentrations, on average reducing N20 by 20 % during the first 3 h of fog formation. Extremely-low-N20 events (< 10 cm−3) occur in all seasons, and we suggest that fog, and potentially cloud formation, can be limited by low aerosol particle concentrations over central Greenland.
Source:

Atmos. Chem. Phys., 21, 15351–15374
DOI:

https://doi.org/10.5194/acp-21-15351-2021
Document Type:

Journal Article
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CC BY
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Submitted
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urn:sha256:e1457327da210af53f17021ac048f0b6b408ee1708a823518a83b5c7071d5dca
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https://repository.library.noaa.gov/view/noaa/44593/noaa_44593_DS1.pdf
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[PDF - 12.06 MB ]

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