Aircraft Observations Reveal the Relationship Between Cumulus Entrainment Rate and Aerosol Loading
Geophysical Research Letters,
Год журнала:
2024,
Номер
51(19)
Опубликована: Окт. 1, 2024
Abstract
The
influence
of
entrainment,
a
key
process
characterized
by
the
entrainment
rate
in
cumulus
parameterization,
on
aerosol‐cloud
interactions
has
been
widely
recognized.
However,
despite
qualitative
links
established
between
and
aerosol
loading,
quantitative
relationship
based
observational
evidence
remains
elusive.
This
study
utilizes
aircraft
observations
clouds
during
two
field
campaigns
to
determine
loading.
In
both
campaigns,
is
negatively
correlated
with
It
speculated
that
increased
loading
enhances
cloud
edge
droplet
evaporation,
which
leads
buoyancy
vertical
velocity
within
cloud,
thereby
reducing
rate.
Further
analysis
shows
response
perturbations
more
significant
smaller
weak
less
pronounced
under
opposite
conditions.
These
findings
shed
new
light
improving
description
parameterizations.
Язык: Английский
Development and Application of a New Convective Entrainment Rate Parameterization for Improving Precipitation Simulation Over the Tibetan Plateau and Its Surrounding Areas
Journal of Advances in Modeling Earth Systems,
Год журнала:
2025,
Номер
17(1)
Опубликована: Янв. 1, 2025
Abstract
The
Tibetan
Plateau
(TP)
significantly
impacts
the
global
climate.
TP's
unique
geographical
conditions
make
it
one
of
areas
with
largest
precipitation
biases
in
numerical
models.
overestimation
and
distribution
models
are
closely
related
to
parameterization
convection
processes
over
TP.
In
light
this,
a
new
deep
convective
entrainment
rate
suitable
for
region
is
developed
based
on
observational
data
applied
Grell‐Freitas
Ensemble
Scheme
Weather
Research
Forecasting
Model.
scheme
reduces
simulated
TP,
decreasing
from
29.4%
default
11.8%.
physical
mechanism
behind
improved
simulation
results
as
follows:
first,
closer
observed
results.
Second,
terms
cloud
macrophysics,
increases
rate,
top
height
depth
clouds,
decreases
number
grids
updrafts
vertical
layers
surface.
Third,
microphysics,
increased
water
content
weakens
intensity
precipitation.
All
these
mechanisms
ultimately
reduce
accumulated
amount,
providing
an
optimized
modeling
tool
weather
climate
research
which
also
aids
better
assessing
cycle
resource
reserves
“Asian
Water
Tower.”
Язык: Английский
Reconciling observed and predicted droplet concentration at the Indian summer monsoon cloud base
The Science of The Total Environment,
Год журнала:
2025,
Номер
973, С. 179077 - 179077
Опубликована: Март 22, 2025
Язык: Английский
Implementation and Evaluation of Physics‐Driven Dynamic Entrainment‐Mixing Parameterization in a Climate Model and Its Impact on Low‐Cloud Simulation
Journal of Geophysical Research Atmospheres,
Год журнала:
2025,
Номер
130(6)
Опубликована: Март 25, 2025
Abstract
The
turbulent
entrainment‐mixing
process
in
the
Community
Earth
System
Model
version
1.2
(CESM1.2)
is
assumed
to
follow
extremely
inhomogeneous
entrainment‐mixing.
However,
different
scenarios
can
occur
real
clouds.
To
address
this
deficiency,
a
unifying
parameterization
that
represents
processes
implemented
and
evaluated
CESM1.2.
results
indicate
homogeneous
mixing
degree
values
simulated
by
new
CESM1.2
are
predominantly
greater
than
50%,
suggesting
tendency
toward
mixing.
Compared
mechanism,
increases
cloud
droplet
number
concentration
(
N
c
).
More
importantly,
improves
low‐cloud
fraction
(CLDLOW)
simulation
Northwest
Pacific
(NWP)
Southeast
(SEP)
regions,
with
relative
improvements
of
2.95%
4.17%,
respectively.
Furthermore,
reach
up
44.6%
16.2%
NWP
SEP
respectively,
when
considering
relationship
between
CLDLOW.
Further
analysis
reveals
enhances
optical
depth,
longwave
radiative
cooling
effect,
net
condensation
rate,
water
ratio,
lower‐troposphere
stability,
CLDLOW
increasing
.
These
underscore
importance
improving
climate
models.
Язык: Английский
Detection and Spatiotemporal Distribution Analysis of Vertically Developing Convective Clouds over the Tibetan Plateau and East Asia Using GEO-KOMPSAT-2A Observations
Remote Sensing,
Год журнала:
2025,
Номер
17(8), С. 1427 - 1427
Опубликована: Апрель 17, 2025
Vertically
developing
convective
clouds
(VDCCs),
characterized
by
cloud-top
ascent
and
cooling,
are
critical
precursors
to
severe
weather
due
their
association
with
intense
updrafts.
However,
existing
studies
constrained
limited
spatiotemporal
resolution
of
data
tracking
methodologies,
hindering
real-time
pixel-level
capture
VDCC
evolution.
Furthermore,
large-scale
statistical
analyses
distribution
remain
scarce
compared
mature
systems,
particularly
in
topographically
complex
regions
like
the
Tibetan
Plateau
(TP).
To
address
these
challenges,
we
integrated
an
optical
flow
algorithm
(for
dense
atmospheric
motion
vector
(AMV)
retrieval)
cooling
rates
(CTCRs,
as
indicators
vertical
development),
leveraging
high
multispectral
capabilities
GEO-KOMPSAT-2A
(GK2A)
satellite.
This
approach
achieved
detection
at
10
min
intervals
across
diurnal
cycles,
enabling
comprehensive
analysis.
Based
on
this
technical
foundation,
most
important
finding
study
was
distinct
over
TP
East
Asia
(EA)
analyzing
three
summers
(2021–2023).
Specifically,
peaks
preceded
precipitation
2–3
h,
confirming
precursor
roles
both
regions.
Regional
comparisons
revealed
that
topographic
thermal
forcing
strongly
influenced
patterns.
The
exhibited
earlier
more
frequent
daytime
convection
middle-to-low
levels
than
EA,
driven
forcing,
yet
development
moisture
scarcity.
In
contrast,
EA’s
monsoonal
sustained
deeper
convection,
VDCCs
penetrating
upper
troposphere.
offer
new
insights
into
processes
surrounding
regions,
offering
potential
improvements
monitoring
early
warning
systems.
Язык: Английский
AS-SOMTF: A novel Multi-task Learning Model for Water Level Prediction by Satellite Remoting
Digital Communications and Networks,
Год журнала:
2025,
Номер
unknown
Опубликована: Май 1, 2025
Язык: Английский
Vertical structures and microphysical mechanisms of winter precipitation over the southwestern mountainous area of China
Atmospheric Research,
Год журнала:
2024,
Номер
303, С. 107346 - 107346
Опубликована: Март 15, 2024
Язык: Английский
Revisiting the dry-to-wet shift of summer precipitation over the Three-River Headwaters region, hinterland of the Tibetan Plateau: a perspective of moisture sources changes
Climate Dynamics,
Год журнала:
2024,
Номер
62(9), С. 8827 - 8847
Опубликована: Июль 30, 2024
Язык: Английский
Quantifying the Turbulent Entrainment‐Mixing Processes Based on Z‐LWC Relationships of Cloud Droplets
Geophysical Research Letters,
Год журнала:
2024,
Номер
52(1)
Опубликована: Дек. 27, 2024
Abstract
Turbulent
entrainment‐mixing
processes
profoundly
influence
the
relationship
between
radar
reflectivity
factor
and
liquid
water
content
(
Z
‐LWC)
of
cloud
droplets.
However,
quantification
mechanisms
based
on
‐LWC
is
still
lacking.
To
address
this
gap,
12,218
cases
are
simulated
using
Explicit
Mixing
Parcel
Model.
We
examine
variations
parameters
in
power‐law
=
a
LWC
b
,
parameter
homogeneous
mixing
degree
ψ
),
measure
quantifying
processes.
The
results
indicate
that
distributes
within
range
1–2,
with
positive
correlation
.
‐
fitted,
which
connects
for
various
types.
suggest
potential
employing
remote
sensing
approach
to
investigate
non‐precipitating
small
cumulus/stratocumulus
clouds,
thereby
overcoming
limitations
traditional
observational
studies
rely
solely
aircraft
observations.
Язык: Английский