Novel Monsoon Indices Based on Vector Projection and Directed Angle for Measuring East Asian Summer Monsoon
Research Square (Research Square),
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 1, 2025
Abstract
This
study
presents
a
novel
framework
within
unified
monsoon
coordinate
system
for
quantifying
variability
of
the
East
Asian
Summer
Monsoon
(EASM)
through
integrating
two
new
concepts:
vector
projection
(MVP),
intensity
and
directed
angle
(DA),
capturing
directional
variability.
The
newly
introduced
MVP
DA
indices
based
on
show
very
significant
correlations
with
summer
precipitation
in
middle-lower
Yangtze
River,
much
more
surpassing
previous
EASM
can
also
capture
Meiyu-Changma-Baiu
belt's
spatial
pattern
clearly
comprehensively.
Strong
years
are
characterized
by
convergence,
indicated
along
Meiyu
front,
coupled
anomalous
cyclonic
shear,
reflected
deflection,
being
associated
wetter
conditions
belt
westward
extension
southward
shift
Western
Pacific
Subtropical
High
(WPSH),
alongside
drier
northern
China,
which
together
manifest
north-south
dipole
pattern.
In
contrast,
weak
exhibit
opposite
characteristics
strong
years.
Moreover,
this
paper
proposes
creative
conception—the
Rossby
wave
ray
flux
(WRF),
reflect
pathway
activity
Indo-Asian-Pacific
(IAP)
teleconnection
well.
be
extended
to
other
domains
could
provide
valuable
insights
better
variabilities
monsoons
understanding
their
relationships
climate
factors
future.
Meanwhile,
WRF
may
tool
diagnosing
local
propagation
direction
waves.
Language: Английский
Novel monsoon indices based on vector projection and directed angle for measuring the East Asian summer monsoon
Climate Dynamics,
Journal Year:
2025,
Volume and Issue:
63(5)
Published: May 1, 2025
Language: Английский