Up-gully flow in the great plains region: A mechanism for perturbing the nighttime lower atmosphere?

Details Up-gully flow in the great plains region: A mechanism for perturbing the nighttime lower atmosphere? Up-gully flow in the great plains region: A mechanism for perturbing the nighttime lower atmosphere?

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29s..37b&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 19, pp. 37-1, CiteID 1931, DOI 10.1029/2002GL015435

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Meteorology And Atmospheric Dynamics: Land/Atmosphere Interactions, Meteorology And Atmospheric Dynamics: Boundary Layer Processes, Meteorology And Atmospheric Dynamics: Waves And Tides, Meteorology And Atmospheric Dynamics: Convective Processes

Scientific paper

Studies using data gathered during CASES-99 show that when the near-surface nighttime wind direction shifts through the ``up-gully'' direction of a significant gully near the tower, the flow produces a pronounced but localized upward surge of vertical velocity up to at least 55 m. This surge generates an outward propagating wave packet having horizontal and vertical wavelengths on the order of 100-250 m with tilted wave fronts consistent with upward phase propagation. The wave packet is observable (with significant delays) by other sensors out to 850 m. As a working hypothesis we assume that the up-gully flow is constricted and strengthened as it progresses up the narrowing gully. We theorize that, upon exiting the gully, the flow has a pronounced and tightly confined vertical component that in turn produces a packet of internal propagating gravity waves.

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