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Wind Turning in the Planetary Boundary Layer in CMIP6 Models
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- Pyykkö, Joakim, 1995- (author)
- 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.
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- Svensson, Gunilla (author)
- Stockholms universitet,KTH,SeRC - Swedish e-Science Research Centre,Strömningsmekanik och Teknisk Akustik,Meteorologiska institutionen (MISU),Bolincentret för klimatforskning (tills m KTH & SMHI)
- (creator_code:org_t)
- American Meteorological Society, 2023
- 2023
- English.
- In: Journal of Climate. - : American Meteorological Society. - 0894-8755 .- 1520-0442. ; 36:17, s. 5729-5742
- Journal article (peer-reviewed)
Abstract
Subject headings
Close
- 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.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Klimatforskning (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Climate Research (hsv//eng)
Keyword
- Atmosphere
- Mass fluxes
- transport
- Wind shear
- Radiosonde
- rawinsonde observations
- Climate models
Publication and Content Type
- ref (subject category)
- art (subject category)
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