In:
Atmospheric Chemistry and Physics, Copernicus GmbH, Vol. 22, No. 15 ( 2022-08-03), p. 9915-9947
Abstract:
Abstract. We present an Arctic aerosol optical depth (AOD) climatology and trend
analysis for 2003–2019 spring and summertime periods derived from a
combination of multi-agency aerosol reanalyses, remote-sensing retrievals,
and ground observations. This includes the U.S. Navy Aerosol Analysis and
Prediction System ReAnalysis version 1 (NAAPS-RA v1), the NASA Modern-Era
Retrospective Analysis for Research and Applications, version 2 (MERRA-2),
and the Copernicus Atmosphere Monitoring Service ReAnalysis (CAMSRA).
Spaceborne remote-sensing retrievals of AOD are considered from the
Moderate Resolution Imaging Spectroradiometer (MODIS), the Multi-angle
Imaging SpectroRadiometer (MISR), and the Cloud-Aerosol Lidar with Orthogonal
Polarization (CALIOP). Ground-based data include sun photometer data from
AErosol RObotic NETwork (AERONET) sites and oceanic Maritime Aerosol Network
(MAN) measurements. Aerosol reanalysis AODs and spaceborne retrievals show
consistent climatological spatial patterns and trends for both spring and
summer seasons over the lower Arctic (60–70∘ N). Consistent AOD
trends are also found for the high Arctic (north of 70∘ N) from
reanalyses. The aerosol reanalyses yield more consistent AOD results than
climate models, can be verified well with AERONET, and corroborate complementary
climatological and trend analysis. Speciated AODs are more variable than
total AOD among the three reanalyses and a little more so for March–May (MAM) than for June–August (JJA). Black carbon (BC) AOD in the Arctic comes
predominantly from biomass burning (BB) sources in both MAM and JJA, and BB
overwhelms anthropogenic sources in JJA for the study period. AOD exhibits a multi-year negative MAM trend and a positive JJA trend in
the Arctic during 2003–2019, due to an overall decrease in
sulfate/anthropogenic pollution and a significant JJA increase in BB smoke.
Interannual Arctic AOD variability is significantly large, driven by
fine-mode and, specifically, BB smoke, with both smoke contribution and
interannual variation larger in JJA than in MAM. It is recommended that
climate models should account for BB emissions and BB interannual
variabilities and trends in Arctic climate change studies.
Type of Medium:
Online Resource
ISSN:
1680-7324
DOI:
10.5194/acp-22-9915-2022
DOI:
10.5194/acp-22-9915-2022-supplement
Language:
English
Publisher:
Copernicus GmbH
Publication Date:
2022
detail.hit.zdb_id:
2092549-9
detail.hit.zdb_id:
2069847-1
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