Properties of the atmospheric boundary layer above a subtropical oceanic front.
propertiesofatmo00higg.pdf (4.570Mb)Abstract
The marine atmospheric boundary layer (MABL)
and synoptic-scale situation is described using rawinsonde
and sea-surface temperature (SST) data collected during the
1986 Frontal Air-Sea Interaction Experiment (FASINEX). The
data obtained from 14 February to 09 March 1986 are divided
into eight consecutive three-day periods and analyzed.
Significant changes in synoptic-scale features and flow
patterns occurred during each three-day period due to
movement of low pressure systems. MABL changes noted were
due primarily to large scale convergence. Thirteen pairs of
rawinsonde launches, seven from opposite sides of an oceanic
front and six from the same side (five warm, one cold) are
compared. The time difference between soundings in each
pair did not exceed sixty minutes. Boundary layer height,
mixed layer potential temperature and specific humidity
differences between paired rawinsonde launches were larger
when launches were from opposite sides of the oceanic front.
A combination of both shipboard and aircraft data will be
necessary to further describe the conditions of the MABL and
synoptic-scale situation.
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