Last Updated：2025/11/21
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Pilots must account for the geostrophic wind level, typically between 1.2 and 1.6 kilometers, because it usually marks the top of the planetary boundary layer and influences flight planning.
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Pilots must account for the geostrophic wind level, typically between 1.2 and 1.6 kilometers, because it usually marks the top of the planetary boundary layer and influences flight planning.
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Related words
geostrophic wind level
Noun
uncountable
(meteorology)
The
lowest
level
at
which
the
wind
becomes
geostrophic.
In
practice,
the
geostrophic
wind
level
is
between
1.2
kilometers
(3,928
feet)
and
1.6
kilometers
(5,238
feet).
This
wind
level
probably
marks
the
upper
limit
of
frictional
influence
of
the
earth's
surface.
The
geostrophic
wind
level
may
be
considered
to
be
the
top
of
the
planetary
boundary
layer,
that
is,
the
base
of
the
free
atmosphere.
Japanese Meaning
気象学用語。地表近くでは摩擦が風に影響を与えるが、ある高度では風が地球の自転の影響であるコリオリ力と気圧勾配力の釣り合いにより、摩擦の影響が極めて小さくなる。その高度は通常1.2～1.6キロメートルとされ、大気境界層の上限、あるいは自由大気の基底とみなされる。
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