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Investigating processes that control the vertical distribution of aerosol in five subtropical marine stratocumulus regions: A sensitivity study using the climate model NorESM1-M
Stockholms universitet, Naturvetenskapliga fakulteten, Meteorologiska institutionen (MISU).
Stockholms universitet, Naturvetenskapliga fakulteten, Meteorologiska institutionen (MISU).ORCID-id: 0000-0003-4867-4007
Stockholms universitet, Naturvetenskapliga fakulteten, Meteorologiska institutionen (MISU).
(Engelska)Manuskript (preprint) (Övrigt vetenskapligt)
Nationell ämneskategori
Geovetenskap och miljövetenskap
Forskningsämne
atmosfärvetenskap och oceanografi
Identifikatorer
URN: urn:nbn:se:su:diva-168049OAI: oai:DiVA.org:su-168049DiVA, id: diva2:1307605
Tillgänglig från: 2019-04-28 Skapad: 2019-04-28 Senast uppdaterad: 2020-01-23Bibliografiskt granskad
Ingår i avhandling
1. Aerosol-cloud-radiation interactions in global climate models
Öppna denna publikation i ny flik eller fönster >>Aerosol-cloud-radiation interactions in global climate models
2019 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Clouds can reflect, absorb and re-emit radiation, thereby inducing a cooling or warming effect on the climate. However, the response of clouds to a changing climate is highly uncertain and the representation of clouds in state-of-the-art climate models remains a key challenge for future climate projections. Factors contributing to this uncertainty include processes on the microphysical scale involving aerosol particles with the size of just a few nanometers to micrometers. This thesis focuses on the representation of aerosol-cloud-radiation interactions in global climate models. Using idealized experiments from a model-intercomparison project with different anthropogenic aerosol forcings, it was found that both sulfate and non-sulfate aerosols yield an increase in cloud albedo in five regions of subtropical marine stratocumulus clouds. The changes in cloud albedo in the models were driven by changes in the cloud droplet number concentration and liquid water content. Further, it was found that the microphysical coupling of underlying aerosol-cloud interactions in models seems to dominate on the monthly timescale in subtropical marine stratocumulus regions, which can not be confirmed in observations. Quantifying the effect of aerosols on cloud properties in observations remains challenging. In addition, comparisons with satellite retrievals and the global climate model NorESM showed that this model is not able to capture elevated aerosol above cloud, seen in observations in two regions of marine stratocumulus clouds. Sensitivity experiments revealed that the model is most sensitive to the aerosol emissions, convection and wet scavenging in terms of the vertical aerosol distribution. Finally, the representation of aerosol absorption in global climate models was investigated. It was found that most of the models underestimate absorption by aerosols in a focus domain in Asia. Sensitivity studies with NorESM give rise to variations that lie within the large inter-model diversity.

Ort, förlag, år, upplaga, sidor
Stockholm: Department of Meteorology, Stockholm University, 2019. s. 58
Nyckelord
Aerosols, clouds, global climate models
Nationell ämneskategori
Meteorologi och atmosfärforskning
Forskningsämne
atmosfärvetenskap och oceanografi
Identifikatorer
urn:nbn:se:su:diva-168266 (URN)978-91-7797-612-7 (ISBN)978-91-7797-613-4 (ISBN)
Disputation
2019-06-14, Ahlmannsalen, Geovetenskapens hus, Svante Arrhenius väg 12, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Anmärkning

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 3: Manuscript. Paper 4: Manuscript.

Tillgänglig från: 2019-05-22 Skapad: 2019-04-29 Senast uppdaterad: 2019-05-23Bibliografiskt granskad

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Av författaren/redaktören
Frey, LenaBender, Frida A.-M.Svensson, Gunilla
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Meteorologiska institutionen (MISU)
Geovetenskap och miljövetenskap

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