Assessing the effectiveness of convective boundary layer height estimation using flight data and ERA5 profiles in the Amazon biome
Climate Dynamics,
Journal Year:
2025,
Volume and Issue:
63(2)
Published: Jan. 31, 2025
Language: Английский
The Two Arctic Wintertime Boundary Layer States: Disentangling the Role of Cloud and Wind Regimes in Reanalysis and Observations During MOSAiC
Atmospheric Science Letters,
Journal Year:
2025,
Volume and Issue:
26(4)
Published: April 1, 2025
ABSTRACT
The
wintertime
central
Arctic
atmosphere
comprises
a
radiatively
clear
and
opaque
state,
which
are
linked
to
synoptic
forcing
mixed‐phase
clouds.
Weather
climate
models
often
lack
process
representations
surrounding
these
states,
but
prior
work
mostly
treated
the
problem
as
an
aggregate
of
conditions,
resulting
in
partially
overlapping
biases.
Here,
we
disaggregate
states
confront
ERA5
reanalysis
with
observations
from
MOSAiC
campaign
over
sea
ice
during
winter
2019/2020.
Low‐level
winds
liquid
water
path
(LWP)
combined
derive
different
classes.
Results
show
that
state
is
primarily
formed
by
weak/moderate
absence
liquid‐bearing
clouds,
while
strong
enhanced
LWP
form
state.
struggles
reproduce
basic
statistics,
shows
too
weak
sensitivity
thermal
radiation
forcing,
overestimates
for
similar
amounts.
latter
caused
warm
bias,
has
pronounced
inversion
structure
largest
calm
conditions.
Under
bias
constant
height
discrepancies
cloud
altitude
appear.
Separating
conditions
regarded
useful
process‐oriented
evaluation
troposphere
models.
Language: Английский
Sea Breeze-Driven Variations in Planetary Boundary Layer Height over Barrow: Insights from Meteorological and Lidar Observations
Hui Li,
No information about this author
Wei Gong,
No information about this author
Boming Liu
No information about this author
et al.
Remote Sensing,
Journal Year:
2025,
Volume and Issue:
17(9), P. 1633 - 1633
Published: May 5, 2025
The
planetary
boundary
layer
height
(PBLH)
in
coastal
Arctic
regions
is
influenced
by
sea
breeze
circulation.
However,
the
specific
mechanisms
through
which
affects
PBLH
evolution
remain
insufficiently
explored.
This
study
uses
meteorological
data,
micro-pulse
lidar
(MPL)
and
sounding
profiles
from
2014
to
2021
investigate
annual
polar
day
driven
breezes
Barrow
region
of
Alaska,
as
well
mechanisms.
results
show
that
events
significantly
suppress
PBLH,
especially
during
day,
when
prolonged
solar
radiation
intensifies
thermal
contrast
between
land
ocean.
cold,
moist
stabilizes
atmospheric
conditions,
reducing
net
sensible
heat
flux.
All
these
factors
inhibit
turbulent
mixing
development.
Lidar
analyses
further
reveal
lower
compared
non-sea-breeze
with
peak
its
probability
density
distribution
occurring
at
a
range.
variable
importance
projection
(VIP)
analysis
identifies
relative
humidity
(VIP
=
1.95)
temperature
1.1)
primary
controlling
highlighting
influence
stability
regulating
PBLH.
These
findings
emphasize
crucial
role
modulating
PBL
dynamics
Arctic,
significant
implications
for
improving
climate
models
studies
on
pollutant
dispersion
regions.
Language: Английский
The Vertical Structure of Turbulence Kinetic Energy Near the Arctic Sea‐Ice Surface
Geophysical Research Letters,
Journal Year:
2024,
Volume and Issue:
51(21)
Published: Nov. 10, 2024
Abstract
Atmospheric
turbulence
over
the
Arctic
sea‐ice
surface
has
been
understudied
due
to
lack
of
observational
data.
In
this
study,
we
focus
on
kinetic
energy
(
TKE
)
sea
ice
and
distinguish
its
two
different
vertical
structures,
“Surface”
type
“Elevated”
type,
using
observations
during
Multidisciplinary
drifting
Observatory
for
Study
Climate
expedition
(MOSAiC).
The
maximum
near
(at
2
m),
while
at
a
higher
level
(6
m).
budget
analysis
indicates
that
is
caused
by
increased
shear
production
6
m.
addition,
spectral
reveals
contribution
horizontal
large
eddies
enhanced
in
type.
Finally,
how
structure
affects
parameterization
turbulent
momentum
flux
discussed.
Language: Английский