Transient eddy forcing of blocking flows.

Research output: Contribution to journalArticle

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Abstract

The net forcing of blocking flows by transient eddies having synoptic time scales is examined within the framework of quasi-geostrophic theory. Temporal filtering is used to distinguish the effects of transients having synoptic time scales. The eddy flux convergences for individual blocking events are then composited according to the locations of the blocks. The quasi-geostrophic potential vorticity equation relating geopotential tendency and the eddy flux convergences of heat and vorticity is solved for composite blocking conditions. The diagnosis is performed for both observed blocks and blocks simulated by a general circulation model. The geopotential tendencies due to transient eddies exhibit a quadrature relationship with the blocking pattern throughout the troposphere, with anticyclonic eddy forcing being located about one-quater wavelength upstream of the blocking anticyclone. The effects of transient disturbances on blocking flows as depicted by our diagnostic technique are contrasted with those for earlier studies. Reasons for the inconsistencies in the results of earlier studies are discussed.-from Author

Original languageEnglish (US)
Pages (from-to)3-22
Number of pages20
JournalJournal of the Atmospheric Sciences
Volume44
Issue number1
StatePublished - 1987
Externally publishedYes

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eddy
geopotential
timescale
anticyclone
potential vorticity
vorticity
general circulation model
troposphere
wavelength
disturbance
effect

ASJC Scopus subject areas

  • Atmospheric Science

Cite this

Transient eddy forcing of blocking flows. / Mullen, Steven.

In: Journal of the Atmospheric Sciences, Vol. 44, No. 1, 1987, p. 3-22.

Research output: Contribution to journalArticle

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