Universität zu Köln

Vogel, Annika ORCID: 0000-0001-8868-5646, Alessa, Ghazi, Scheele, Robert, Weber, Lisa, Dubovik, Oleg ORCID: 0000-0003-3482-6460, North, Peter ORCID: 0000-0001-9933-6935 and Fiedler, Stephanie ORCID: 0000-0001-8898-9949 (2022). Uncertainty in Aerosol Optical Depth From Modern Aerosol-Climate Models, Reanalyses, and Satellite Products. J. Geophys. Res.-Atmos., 127 (2). WASHINGTON: AMER GEOPHYSICAL UNION. ISSN 2169-8996

Full text not available from this repository.

Abstract

Despite the implication of aerosols for the radiation budget, there are persistent differences in data for the aerosol optical depth (tau) for 1998-2019. This study presents a comprehensive evaluation of the large-scale spatio-temporal patterns of mid-visible tau from modern data sets. In total, we assessed 94 different global data sets from eight satellite retrievals, four aerosol-climate model ensembles, one operational ensemble product, two reanalyses, one climatology and one merged satellite product. We include the new satellite data SLSTR and aerosol-climate simulations from the Coupled Model Intercomparison Project Phase 6 (CMIP6) and the Aerosol Comparisons between Observations and Models Phase 3 (AeroCom-III). Our intercomparison highlights model differences and observational uncertainty. Spatial mean tau for 60 degrees N - 60 degrees S ranges from 0.124 to 0.164 for individual satellites, with a mean of 0.14. Averaged tau from aerosol-climate model ensembles fall within this satellite range, but individual models do not. Our assessment suggests no systematic improvement compared to CMIP5 and AeroCom-I. Although some regional biases have been reduced, tau from both CMIP6 and AeroCom-III are for instance substantially larger along extra-tropical storm tracks compared to the satellite products. The considerable uncertainty in observed tau implies that a model evaluation based on a single satellite product might draw biased conclusions. This underlines the need for continued efforts to improve both model and satellite estimates of tau, for example, through measurement campaigns in areas of particularly uncertain satellite estimates identified in this study, to facilitate a better understanding of aerosol effects in the Earth system.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Vogel, Annika UNSPECIFIED orcid.org/0000-0001-8868-5646 UNSPECIFIED Alessa, Ghazi UNSPECIFIED UNSPECIFIED UNSPECIFIED Scheele, Robert UNSPECIFIED UNSPECIFIED UNSPECIFIED Weber, Lisa UNSPECIFIED UNSPECIFIED UNSPECIFIED Dubovik, Oleg UNSPECIFIED orcid.org/0000-0003-3482-6460 UNSPECIFIED North, Peter UNSPECIFIED orcid.org/0000-0001-9933-6935 UNSPECIFIED Fiedler, Stephanie UNSPECIFIED orcid.org/0000-0001-8898-9949 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-686771
DOI:	10.1029/2021JD035483
Journal or Publication Title:	J. Geophys. Res.-Atmos.
Volume:	127
Number:	2
Date:	2022
Publisher:	AMER GEOPHYSICAL UNION
Place of Publication:	WASHINGTON
ISSN:	2169-8996
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language DUST MODEL; AEROCOM; MODIS; AOD; RETRIEVAL; LAND; ASSIMILATION; REFLECTANCE; CONVECTION; MONSOON Multiple languages Meteorology & Atmospheric Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/68677