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Wind Turning in the...
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Pyykkö, Joakim,1995-Stockholms universitet,Meteorologiska institutionen (MISU),Bolincentret för klimatforskning (tills m KTH & SMHI),Stockholm Univ, Dept Meteorol, Stockholm, Sweden.;Stockholm Univ, Bolin Ctr Climate Res, Stockholm, Sweden.
(författare)
Wind Turning in the Planetary Boundary Layer in CMIP6 Models
- Artikel/kapitelEngelska2023
Förlag, utgivningsår, omfång ...
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American Meteorological Society,2023
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printrdacarrier
Nummerbeteckningar
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LIBRIS-ID:oai:DiVA.org:kth-335181
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-335181URI
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https://doi.org/10.1175/JCLI-D-22-0705.1DOI
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-220904URI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
Anmärkningar
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QC 20230901
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A set of CMIP6 models is evaluated for the turning of the wind over the planetary boundary layer (PBL) and the corresponding cross-isobaric mass flux. The bulk Richardson number method is used to calculate the height of the PBL to allow for comparisons with a climatology of observed wind-turning angles documented by Lindvall and Svensson based on more than 800 stations in the Integrated Global Radiosonde Archive. Wind-turning angles are found to be under-estimated in all models, with the GFDL CM4 model having the closest distribution to the observations. Large, negative cross-isobaric mass fluxes (flow toward higher pressure) are found over high-terrain areas and the North Atlantic storm -track region in all models and the ERA-Interim reanalysis. Bulk Richardson number-derived PBLs are particularly shal-low in the Norwegian Earth System Model, medium atmosphere-medium ocean resolution (NorESM2-MM), likely caused by a change in the turbulence and cloud scheme as compared to the CESM2 model that uses the same atmospheric model, leading to small wind-turning angles and cross-isobaric mass fluxes. Using the 850-hPa level as the upper boundary broad-ens the wind-turning angle distribution and increases the amount of cross-isobaric mass flux for all models. This makes the models closer to the observations, although substantial differences are still present. The assumption of a constant geo-strophic wind throughout the PBL possibly affects the calculated mass fluxes.
Ämnesord och genrebeteckningar
Biuppslag (personer, institutioner, konferenser, titlar ...)
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Svensson, GunillaStockholms universitet,KTH,SeRC - Swedish e-Science Research Centre,Strömningsmekanik och Teknisk Akustik,Meteorologiska institutionen (MISU),Bolincentret för klimatforskning (tills m KTH & SMHI)(Swepub:su)gsven
(författare)
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Stockholms universitetMeteorologiska institutionen (MISU)
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Journal of Climate: American Meteorological Society36:17, s. 5729-57420894-87551520-0442
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