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Detection and attribution of aerosol–cloud interactions in large-domain large-eddy simulations with the ICOsahedral Non-hydrostatic model

Costa-Surós, Montserrat and Sourdeval, Odran and Acquistapace, Claudia and Baars, Holger and Carbajal Henken, Cintia and Genz, Christa and Hesemann, Jonas and Jimenez, Cristofer and König, Marcel and Kretzschmar, Jan and Madenach, Nils and Meyer, Catrin I. and Schrödner, Roland and Seifert, Patric and Senf, Fabian and Brück, Matthias and Cioni, Guido and Engels, Jan Frederik and Fieg, Kerstin and Gorges, Ksenia and Heinze, Rieke and Siligam, Pavan Kumar and Burkhardt, Ulrike and Crewell, Susanne and Hoose, Corinna and Seifert, Axel and Tegen, Ina and Quaas, Johannes (2020) Detection and attribution of aerosol–cloud interactions in large-domain large-eddy simulations with the ICOsahedral Non-hydrostatic model. Atmospheric Chemistry and Physics (ACP), 20, pp. 5657-5678. Copernicus Publications. doi: 10.5194/acp-2019-850. ISSN 1680-7316.

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Official URL: https://www.atmos-chem-phys.net/20/5657/2020/


Clouds and aerosols contribute the largest uncertainty to current estimates and interpretations of the Earth’s changing energy budget. Here we use a new-generation large-domain large-eddy model, ICON-LEM (ICOsahedral Non-hydrostatic Large Eddy Model), to simulate the response of clouds to realistic anthropogenic perturbations in aerosols serving as cloud condensation nuclei (CCN). The novelty compared to previous studies is that (i) the LEM is run in weather prediction mode and with fully interactive land surface over a large domain and (ii) a large range of data from various sources are used for the detection and attribution. The aerosol perturbation was chosen as peak-aerosol conditions over Europe in 1985, with more than fivefold more sulfate than in 2013. Observational data from various satellite and ground-based remote sensing instruments are used, aiming at the detection and attribution of this response. The simulation was run for a selected day (2 May 2013) in which a large variety of cloud regimes was present over the selected domain of central Europe. It is first demonstrated that the aerosol fields used in the model are consistent with corresponding satellite aerosol optical depth retrievals for both 1985 (perturbed) and 2013 (reference) conditions. In comparison to retrievals from groundbased lidar for 2013, CCN profiles for the reference conditions were consistent with the observations, while the ones for the 1985 conditions were not. Similarly, the detection and attribution process was successful for droplet number concentrations: the ones simulated for the 2013 conditions were consistent with satellite as well as new ground-based lidar retrievals, while the ones for the 1985 conditions were outside the observational range. For other cloud quantities, including cloud fraction, liquid water path, cloud base altitude and cloud lifetime, the aerosol response was small compared to their natural variability. Also, large uncertainties in satellite and ground-based observations make the detection and attribution difficult for these quantities. An exception to this is the fact that at a large liquid water path value (LWP > 200 g m−2), the control simulation matches the observations, while the perturbed one shows an LWP which is too large. The model simulations allowed for quantifying the radiative forcing due to aerosol–cloud interactions, as well as the adjustments to this forcing. The latter were small compared to the variability and showed overall a small positive radiative effect. The overall effective radiative forcing (ERF) due to aerosol–cloud interactions (ERFaci) in the simulation was dominated thus by the Twomey effect and yielded for this day, region and aerosol perturbation −2.6 W m−2. Using general circulation models to scale this to a global-mean present-day vs. pre-industrial ERFaci yields a global ERFaci of −0.8 W m−2.

Item URL in elib:https://elib.dlr.de/134908/
Document Type:Article
Title:Detection and attribution of aerosol–cloud interactions in large-domain large-eddy simulations with the ICOsahedral Non-hydrostatic model
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Costa-Surós, MontserratUniv. KölnUNSPECIFIED
Sourdeval, OdranUniv. de Lille, Villeneuve d’Ascq, FUNSPECIFIED
Acquistapace, ClaudiaUniv. KölnUNSPECIFIED
Carbajal Henken, CintiaFreie Univ. BerlinUNSPECIFIED
Genz, ChristaUniv. LeipzigUNSPECIFIED
Hesemann, JonasKIT, KarlsruheUNSPECIFIED
Jimenez, CristoferTROPOS, LeipzigUNSPECIFIED
Kretzschmar, JanUniv. LeipzigUNSPECIFIED
Madenach, NilsInstitute for Space Sciences, Freie Universität Berlin, Berlin, GermanyUNSPECIFIED
Meyer, Catrin I.Jülich Supercomputing Centre, Forschungszentrum Jülich, Jülich, GermanyUNSPECIFIED
Schrödner, RolandTROPOS, LeipzigUNSPECIFIED
Seifert, PatricTROPOS, LeipzigUNSPECIFIED
Brück, MatthiasMPI für Meteorologie, HamburgUNSPECIFIED
Cioni, GuidoMPI für Meteorologie, HamburgUNSPECIFIED
Engels, Jan FrederikDKRZ, HamburgUNSPECIFIED
Fieg, KerstinDKRZ, HamburgUNSPECIFIED
Gorges, KseniaDKRZ, HamburgUNSPECIFIED
Heinze, RiekeDKRZ, HamburgUNSPECIFIED
Siligam, Pavan KumarDKRZ, HamburgUNSPECIFIED
Burkhardt, UlrikeDLR, IPAhttps://orcid.org/0000-0002-0742-7176
Crewell, SusanneUniv. Kölnhttps://orcid.org/0000-0003-1251-5805
Hoose, CorinnaKIT, KarlsruheUNSPECIFIED
Seifert, AxelDWD, OffenbachUNSPECIFIED
Quaas, JohannesUniv. LeipzigUNSPECIFIED
Date:May 2020
Journal or Publication Title:Atmospheric Chemistry and Physics (ACP)
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 5657-5678
Publisher:Copernicus Publications
Keywords:aerosol-cloud interaction, Twomey effect, Increase in CCN, cloud changes
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Project Climatic relevance of atmospheric tracer gases, aerosols and clouds
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Earth System Modelling
Deposited By: Burkhardt, Dr.rer.nat. Ulrike
Deposited On:14 May 2020 09:31
Last Modified:18 May 2020 12:18

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