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Multidecadal trend analysis of in situ aerosol radiative properties around the world
Title: Multidecadal trend analysis of in situ aerosol radiative properties around the world
Authors: Collaud Coen, MartineAndrews, ElisabethAlastuey, AndrésPetkov Arsov, TodorBackman, JohnBrem, Benjamin T.Bukowiecki, NicolasCouret, CedricEleftheriadis, KonstantinosFlentje, HaraldFiebig, MarkusGysel-Beer, MartinHand, Jenny L.Hoffer, AndrasHooda, RakeshHueglin, ChristophJoubert, WarrenKeywood, MelitaKim, Jeong EunKim, Sang-WooLabuschagne, CasperLin, Neng-HueiLin, YongMyhre, Cathrine LundLuoma, KristaLyamani, HassanMarinoni, AngelaMayol-Bracero, Olga L.Mihalopoulos, NikosPandolfi, MarcoPrats Porta, Natalia ORCID RESEARCHERID Autor AEMETPrenni, Anthony J.Putaud, Jean-PhilippeRies, LudwigReisen, FabienneSellegri, KarineSharma, SangeetaSheridan, Patrick J.Sherman, James PatrickSun, JunyingTitos Vela, GloriaTorres, ElvisTuch, ThomasWeller, RolfWiedensohler, AlfredZieger, PaulLaj, Paolo
Keywords: Aerosol radiative properties; Absorption coefficients; Aerosol parameters; Aerosol optical; Climate change
Issue Date: 2020
Publisher: European Geosciences Union
Citation: Atmospheric Chemistry and Physics. 2020, 20, p. 8867–8908
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Abstract: In order to assess the evolution of aerosol parameters affecting climate change, a long-term trend analysis of aerosol optical properties was performed on time series from 52 stations situated across five continents. The time series of measured scattering, backscattering and absorption coefficients as well as the derived single scattering albedo, backscattering fraction, scattering and absorption Ångström exponents covered at least 10 years and up to 40 years for some stations. The non-parametric seasonal Mann–Kendall (MK) statistical test associated with several pre-whitening methods and with Sen's slope was used as the main trend analysis method. Comparisons with general least mean square associated with autoregressive bootstrap (GLS/ARB) and with standard least mean square analysis (LMS) enabled confirmation of the detected MK statistically significant trends and the assessment of advantages and limitations of each method. Currently, scattering and backscattering coefficient trends are mostly decreasing in Europe and North America and are not statistically significant in Asia, while polar stations exhibit a mix of increasing and decreasing trends. A few increasing trends are also found at some stations in North America and Australia. Absorption coefficient time series also exhibit primarily decreasing trends. For most of the stations, the present-day statistically significant decreasing 10-year trends of the single scattering albedo were preceded by not statistically significant and statistically significant increasing 10-year trends. The effect of air pollution abatement policies in continental North America is very obvious in the 10-year trends of the scattering coefficient – there is a shift to statistically significant negative trends in 2009–2012 for all stations in the eastern and central USA. This long-term trend analysis of aerosol radiative properties with a broad spatial coverage provides insight into potential aerosol effects on climate changes.
Sponsorship : Provision of data from this study has mainly been acquired in the framework of NOAA-FAN; ACTRIS, under the ACTRIS-2 (Aerosols, Clouds, and Trace gases Research InfraStructure) project supported by European Union (grant agreement no. 654109) and the ACTRIS PPP project under grant agreement no. 739530; and IMPROVE. Some European sites and measurements were also supported by the Co-operative Programme for Monitoring and Evaluation of the Long-range Transmission of Air pollutants in Europe (EMEP) under UNECE.
ISSN: 1680-7316
Appears in Collections:Artículos científicos 2019-2022

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