Evidence of large zonal winds and wind shears in the MLT region over Fort Collins, CO (41N, 105W)

Details Evidence of large zonal winds and wind shears in the MLT region over Fort Collins, CO (41N, 105W) Evidence of large zonal winds and wind shears in the MLT region over Fort Collins, CO (41N, 105W)

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa52a..08s&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SA52A-08

Computer Science

Sound

3334 Middle Atmosphere Dynamics (0341, 0342)

Scientific paper

In a recent article on the 1998 Coqui 2 sounding rocket campaign, Larsen [2000] reported measurements from three chemical release rockets, all of which show large winds (~100m/s) and wind shears (~25ms-1/km) between 90 and 110 km. He then reviewed a more extensive but less publicized data set on earlier chemical release rocket wind measurements and concluded that large wind speeds and wind shears are a common feature of the nighttime MLT region. The implications of large winds and wind shears as a possible norm in the MLT on neutral dynamics, chemistry and electrodynamics are obvious and deserve more attention and study. In1999 and 2000, the Colorado State Sodium Lidar has conducted two-beam lidar observations. Among other things, 38 nights of data were taken with one beam pointing Zenith and one pointing 30 degree East from Zenith. These measurements yielded simultaneous temperature and zonal wind profiles between 80 and 110 km with excellent data quality between 84 and 101km. A quick glance at the regular analysis results suggests that large zonal winds and/or wind gradients exist in nearly 50% of the nights with data. I propose to re-analyze this data set into temperature and zonal wind profiles with 2km and 1hr resolution, from which wind shears and Brunt-Vais

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