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Diagnosing topographic forcing in an atmospheric dataset: The case of the North American Cordillera
Stockholm University, Faculty of Science, Department of Meteorology . Swedish e‐Science Research Centre, Sweden; Ludwig‐Maximilians‐Universität München, Germany.
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Number of Authors: 52020 (English)In: Quarterly Journal of the Royal Meteorological Society, ISSN 0035-9009, E-ISSN 1477-870X, Vol. 146, no 726, p. 314-326Article in journal (Refereed) Published
Abstract [en]

It is well known from modelling studies that surface topography influences the large-scale atmospheric circulation and that several model biases are associated with incorrect representation of topography. The textbook explanation of topographic effects on large-scale circulation appeals to the theoretical relationship between surface forcing and vortex stretching along trajectories in single-layer models. The goal of this study is to design and use a simple diagnostic of the large-scale forcing on the atmosphere when air is passing over topography, directly from atmospheric fields, based on this theoretical relationship. The study examines the interaction of the atmosphere with the North American Cordillera and samples the flow by means of trajectories during Northern Hemisphere winter. We detect a signal of topographic forcing in the atmospheric dataset, which, although much less distinct than in the theoretical relationship, nevertheless exhibits a number of expected properties. Namely, the signal increases with latitude, is usually stronger upslope than downslope, and is enhanced if the flow is more orthogonal to the mountain ridge, for example during periods of positive Pacific-North American index (PNA). Furthermore, a connection is found between an enhanced signal of topographic forcing downslope of the North American Cordillera and periods of more frequent downstream European blocking.

Place, publisher, year, edition, pages
2020. Vol. 146, no 726, p. 314-326
Keywords [en]
large-scale atmospheric circulation, shallow-water model, stretching term, topographic forcing, trajectories
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-177584DOI: 10.1002/qj.3677ISI: 000500069800001OAI: oai:DiVA.org:su-177584DiVA, id: diva2:1386937
Available from: 2020-01-20 Created: 2020-01-20 Last updated: 2020-02-20Bibliographically approved

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Hartung, KerstinSvensson, Gunilla
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