AIDJEX Bulletin #40 - Polar Science Center - University of Washington

9A. Surface-1 eve1 ai r pressure (derived data)
An alternative surface level air pressure file has been derirred fron.
pressure measurements taken at the manned camps and from buoys containing
pressure sensors. These data are interpolated at three-hour
intervals and are combined with the geographic location of the corresponding
station. Pressure, position data are given for four manned
camps and for up to 14 buoys at each 3-hour interval for the period
10 April 1975 to 20 April 1976.
10. Geostrophic surface winds (derived)
From the derived pressure data of file 9 above, geostrophic wind speed
and direction have been calculated for specific points at 6-hour
intervals. In the geogrid file these specific points are the grid
points of a 16x16 overlay of the Beaufort Sea. The geosta file describes
the geostrophic winds at the four AIDJEX manned camps and at the nine
NavSat buoys.
11. Pressure charts (source data)
Surface and 850 mb pressure charts prepared by the National Meteorological
Center for the Northern Hemisphere have been received for 0000 GMT and
1200 GMT each day since April 1975. Measured pressures at the interior
of the Beaufort Sea are combined with these analog data to improve the
detailed accuracy of the derived pressures and winds data of files 9
and 10 above. The last chart of the set is dated 14 October 1976.
12. Surface-level meteorological data
Meteorological instruments were in continuous operation at the AIDJEX
manned camps from April 1975.through April 1976. Hourly averages of
observed wind speed and direction at LO m and air temperatures at 2 m
and 9 m above the surface have been prepared. Time series for each
camp are available for the full operating period of the -in experiment.
There are separation markers between each 20-day interval.
13. Atmospheric inversion levels
Inversion heights in the atmosphere were monitored continuously by
acoustic radar at the manned camp designated as the main camp.
Analog records were digitized at hourly intervals for the periods
13 April-1 October 1975 and 5 November 1975-18 April 1976. As many
as seven distinct inversion heights are given when they exist simultaneously.
A second file has been prepared showing the average height of the dominant
persistent inversion layer over a 3-hour period for every hour of the
experiment .
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