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Show simple item record Horowitz, HM Garland, Rebecca M Thatcher, M Landman, Willem A Dedekind, Zane Van der Merwe, Jacobus Engelbrecht, Francois A 2018-02-26T13:08:03Z 2018-02-26T13:08:03Z 2017-11
dc.identifier.citation Horowtiz, H.M. et al. 2017. Evaluation of climate model aerosol seasonal and spatial variability. Atmospheric Chemistry and Physics, vol. 17(22): 13999-14023 en_US
dc.identifier.issn 1680-7316
dc.identifier.issn 1680-7324
dc.description © Author(s) 2017. This work is distributed under the Creative Commons Attribution 3.0 License. en_US
dc.description.abstract The sensitivity of climate models to the characterization of African aerosol particles is poorly understood. Africa is a major source of dust and biomass burning aerosols and this represents an important research gap in understanding the impact of aerosols on radiative forcing of the climate system. Here we evaluate the current representation of aerosol particles in the Conformal Cubic Atmospheric Model (CCAM) with ground-based remote retrievals across Africa, and additionally provide an analysis of observed aerosol optical depth at 550 nm (AOD(sub550nm) and Ångström exponent data from 34 Aerosol Robotic Network (AERONET) sites. Analysis of the 34 long-term AERONET sites confirms the importance of dust and biomass burning emissions to the seasonal cycle and magnitude of AOD(sub550nm) across the continent and the transport of these emissions to regions outside of the continent. In general, CCAM captures the seasonality of the AERONET data across the continent. The magnitude of modeled and observed multiyear monthly average AOD(sub550nm) overlap within ±1 standard deviation of each other for at least 7 months at all sites except the Réunion St Denis Island site (Réunion St. Denis). The timing of modeled peak AOD(sub550nm) in southern Africa occurs 1 month prior to the observed peak, which does not align with the timing of maximum fire counts in the region. For the western and northern African sites, it is evident that CCAM currently overestimates dust in some regions while others (e.g., the Arabian Peninsula) are better characterized. This may be due to overestimated dust lifetime, or that the characterization of the soil for these areas needs to be updated with local information. The CCAM simulated AOD550 nm for the global domain is within the spread of previously published results from CMIP5 and AeroCom experiments for black carbon, organic carbon, and sulfate aerosols. The model's performance provides confidence for using the model to estimate large-scale regional impacts of African aerosols on radiative forcing, but local feedbacks between dust aerosols and climate over northern Africa and the Mediterranean may be overestimated. en_US
dc.language.iso en en_US
dc.publisher Copernicus Publications en_US
dc.relation.ispartofseries Worklist;20352
dc.subject AERONET en_US
dc.subject Climate models en_US
dc.subject Aerosol seasonal en_US
dc.subject Spatial variability en_US
dc.title Evaluation of climate model aerosol seasonal and spatial variability en_US
dc.type Article en_US

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