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Wind turning in the atmospheric boundary layer over land
Stockholm University, Faculty of Science, Department of Meteorology . Swedish e-Science Research Centre, Sweden.
Stockholm University, Faculty of Science, Department of Meteorology . Swedish e-Science Research Centre, Sweden.
Number of Authors: 22019 (English)In: Quarterly Journal of the Royal Meteorological Society, ISSN 0035-9009, E-ISSN 1477-870X, Vol. 145, no 724, p. 3074-3088Article in journal (Refereed) Published
Abstract [en]

A climatology of the boundary-layer wind-turning angle over land is presented based on radiosonde observations from 800 stations in the Integrated Global Radiosonde Archive (IGRA). The dependence of the wind turning on a suite of parameters is analyzed. Results from previous studies indicating the importance of the planetary boundary layer (PBL) stratification for the angle of wind turning are confirmed here. A clear increase in the wind-turning angle with wind speed, particularly for stratified conditions, is also evident. According to Rossby number similarity theory, the cross-isobaric angle for a neutral and barotropic boundary layer decreases with increasing surface Rossby number, Ro. The IGRA observations indicate that this dependence on Ro might partly be linked to the dependence of the stratification on the wind speed, a dependence that seems to prevail even for the high wind speeds, a criterion that traditionally is used to approximate a neutral PBL. The vertical distribution of the turning of the wind is analyzed using the high-resolution Stratospheric Processes And their Role in Climate (SPARC) data. For unstable cases, there is a maximum in the directional wind shear around the PBL top, whereas for the most stable class of cases there is a maximum near the surface. The wind-turning angles from observations are also compared with values obtained from ERA-Interim reanalysis fields, also presented over ocean. ERA-Interim underestimates the magnitude of the wind-turning angles as well as the range. Furthermore, the midlatitude cross-isobaric mass transport is estimated using the IGRA data. This transport is generally underestimated by ERA-Interim, likely related to the too small wind-turning angles.

Place, publisher, year, edition, pages
2019. Vol. 145, no 724, p. 3074-3088
Keywords [en]
atmospheric boundary layer, cross-isobaric flow, ERA-Interim, radiosonde observations, wind turning
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-177535DOI: 10.1002/qj.3605ISI: 000495449800013OAI: oai:DiVA.org:su-177535DiVA, id: diva2:1383497
Available from: 2020-01-08 Created: 2020-01-08 Last updated: 2020-01-08Bibliographically approved

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