Observations of the Two-Day Wave Using Mesospheric Radars, Satellite Instruments, and Gridded Analyses During the Boreal Summer of 1994

Details Observations of the Two-Day Wave Using Mesospheric Radars, Satellite Instruments, and Gridded Analyses During the Boreal Summer of 1994 Observations of the Two-Day Wave Using Mesospheric Radars, Satellite Instruments, and Gridded Analyses During the Boreal Summer of 1994

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa41b0713r&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SA41B-0713

Physics

3332 Mesospheric Dynamics, 3384 Waves And Tides

Scientific paper

Mesospheric (MF and meteor scatter) radars extending over latitudes from 5oS to 55oN are used to study the spatial structure and temporal evolution of the two-day wave in the horizontal winds from June through October of 1994. Correlative data from satellite instruments aboard UARS (HRDI and MLS) are used to diagnose latitude-longitude patterns in the winds and temperatures and diagnose possible baroclinic conditions. The UKMO gridded analyses provides further information on the global structure of the wave. The event had a sudden onset in mid-June at high northern latitudes. At lower latitudes the wave was observed at progressively later times with an onset in mid-July near the equator. The wave event was characterized by two distinct responses, first at a period of ~2.1 days and then subsequently at ~1.8 days. We hypothesize that the 2.1-day response corresponds to the zonal wavenumber-3, Rossby-gravity mode that is usually identified as the two day wave, while the 1.8-day response is a zonal wavenumber-4 mode that has previously reported, although it is not a normal mode. In addition, a response with a period of ~2.5 days was observed in the HRDI winds. This response may corresond to the gravest antisymmetric zonal wavenumber-2, Rossby-gravity mode. Spectral decompositions of the HRDI winds suggest that this mode becomes important above ~95 km.

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