International Journal of Digital Earth,
Journal Year:
2023,
Volume and Issue:
16(1), P. 3772 - 3793
Published: Sept. 18, 2023
Green
macroalgae
bloom
(GMB),
with
the
dominant
species
of
Ulva
prolifera,
has
regularly
occurred
since
2007
along
China
coast.
Although
disaster
prevention
and
control
achieved
favorable
results
in
2020,
satellite-observed
GMB
annual
maximum
coverage
(AMC)
rebounded
sharply
2021
to
an
unprecedented
level.
The
reasons
for
this
rebound
significant
interannual
variability
over
past
15
years
are
still
open
questions.
Here,
by
using
long-term
time-series
(2007–2022)
optical
Synthetic
Aperture
Radar
satellite
observations
(1000+
scenes),
meteorological
data
water
quality
statistics,
mechanism
analysis
was
performed
exploring
effects
from
natural
factors
human
activities.
Two
key
determinants
AMC
successfully
identified
numerous
potential
which
distribution
a
area
(the
Subei
Shoal)
during
critical
period
(from
April
May
20)
nutrient
availability.
Furthermore,
these
two
parameters,
novel
model
prediction
(R2
=
0.87,
p
<
0.01)
is
proposed
independently
validated,
can
reasonably
explain
(2014–2021)
agree
well
latest
observation
2022
(percentage
difference
12%).
Finally,
suggestions
future
alleviation.
This
work
may
aid
management
measure
optimization.
Remote Sensing,
Journal Year:
2024,
Volume and Issue:
16(3), P. 446 - 446
Published: Jan. 23, 2024
Since
1971,
remote
sensing
techniques
have
been
used
to
map
and
monitor
phenomena
parameters
of
the
coastal
zone.
However,
updated
reviews
only
considered
one
phenomenon,
parameter,
data
source,
platform,
or
geographic
region.
No
review
has
offered
an
overview
that
can
be
accurately
mapped
monitored
with
data.
This
systematic
was
performed
achieve
this
purpose.
A
total
15,141
papers
published
from
January
2021
June
2023
were
identified.
The
1475
most
cited
screened,
502
eligible
included.
Web
Science
Scopus
databases
searched
using
all
possible
combinations
between
two
groups
keywords:
geographical
names
in
areas
platforms.
demonstrated
that,
date,
many
(103)
(39)
(e.g.,
coastline
land
use
cover
changes,
climate
change,
urban
sprawl).
Moreover,
authors
validated
91%
retrieved
parameters,
39
1158
times
(88%
combined
together
other
parameters),
75%
over
time,
69%
several
compared
results
each
available
products.
They
obtained
48%
different
methods,
their
17%
GIS
model
techniques.
In
conclusion,
addressed
requirements
needed
more
effectively
analyze
employing
integrated
approaches:
they
data,
merged
Frontiers in Marine Science,
Journal Year:
2025,
Volume and Issue:
12
Published: Jan. 27, 2025
The
Nanhui-east-tidal-flat
(NETF),
the
largest
marginal
shoal
in
Yangtze
River
of
China,
is
significantly
impacted
by
human
activities.
Prior
research
has
not
detected
presence
green
macroalgae
NETF,
nor
it
explored
effects
reclamation
on
distribution
macroalgae.
However,
2021,
a
small-scale
aggregated
attached
algal
mats
emerged
potentially
signaling
onset
tide
and
necessitating
vigilant
monitoring.
Morphological
molecular
biological
identification
analysis
revealed
that
all
collected
were
attributed
to
single
dominant
species,
Ulva
prolifera
,
characterized
broad
blades
prominent
air
bladders,
colonizing
various
substrates.
U.
exhibited
continuous
growth
from
March
May
peaking
at
wet
weight
373.6229
g/m²
dry
72.7904
1,
within
accessible
sampling
period.
rapid
proliferation
“opportunistic”
was
facilitated
high-level
eutrophication
favorable
environmental
conditions.
Furthermore,
six
potential
germplasm
sources
are
summarized.
dominance
intertidal
zone
often
indicates
high
deteriorating
ecological
With
long-term
repeated
restoration
projects,
vegetation
subjected
vicious
cycle
destruction.
Therefore,
important
recognize
(macroalgae
micropropagules)
will
persist
over
long
term,
mudflats
with
monotonous
eutrophic
habitats
highly
likely
experience
future
large-scale
blooms.
Notably,
floating
observed
sea
area
near
NETF
July
2023,
such
concerns
unfounded.
This
study
conducts
foundational
scientific
algae,
type
relatively
scarce
other
marine
areas.
Most
studies
tend
initiate
only
after
outbreak
tides,
lacking
early
background
data
environment,
thus
rendering
this
significant
reference
value.
Concurrently,
emphasizes
field
surveys
remain
an
essential
approach
for
conducting
algae
region,
need
select
appropriate
methods
based
occurrence
development
mats,
as
required
situation.
Importantly,
reflects
stability
ecosystems
prerequisite
modern
ocean
management
services,
provides
new
perspectives
highlights
risk
factors
should
be
considered
implementation
construction
projects.
Remote Sensing of Environment,
Journal Year:
2024,
Volume and Issue:
309, P. 114223 - 114223
Published: May 27, 2024
Recurrent
transnational
Sargassum
blooms
across
the
Caribbean
Sea
and
Atlantic
Ocean
have
received
growing
attention.
Different
multispectral
sensors,
including
Moderate
Resolution
Imaging
Spectroradiometer
(MODIS),
Visible
Infrared
Imager
Radiometer
Suite
(VIIRS),
Land
Color
Instrument
(OLCI),
been
used
to
map
their
distributions.
However,
synergistic
use
of
multi-sensor
observations
for
high
temporal
resolution
monitoring
is
lacking.
Here,
by
combining
MODIS
(on
Aqua
Terra),
VIIRS
JPSS1
SNPP),
OLCI
Sentinel-3A
-3B)
observations,
3-day
mean
distributions
were
mapped
Central
Atlantic.
The
biomass
densities
derived
using
sensor-specific
Alternative
Floating
Algae
Index
(AFAI)-biomass
model,
consistency
between
six
sensors
was
examined
as
reference
sensor.
Comparison
from
different
shows
that
they
strong
linear
correlations
(R2
≥
0.95),
demonstrating
continuity
six-sensor
observations.
On
average,
combined
datasets
provide
∼1.6
times
more
valid
compared
MODIS-only
dataset
in
2021,
enabling
generation
0.5°
products
over
∼90%
study
region.
Such
detected
∼10-20%
bloom
peak
month
(June
2021)
monthly
counterpart.
Increasing
spatial
0.1°,
can
continuously
monitor
dynamics
with
eddies
tropical
cyclones,
which
cannot
be
well
captured
single
sensors.
This
highlights
multiple
polar-orbiting
satellite
achieve
gap-free
floating
macroalgae
Atlantic,
thus
facilitating
analyses
response
environmental
conditions
prediction
future
events.
IEEE Geoscience and Remote Sensing Letters,
Journal Year:
2023,
Volume and Issue:
20, P. 1 - 5
Published: Jan. 1, 2023
Uncertainties
are
an
integral
part
of
remote
sensing
data
products
in
order
to
quantify
changes,
yet
due
patchiness
and
spatial
heterogeneity,
it
is
difficult
use
field
measurements
estimate
uncertainties
the
satellite-derived
Ulva
prolifera
(U.
prolifera,
also
called
green
tides)
amounts
Yellow
Sea.
This
perhaps
why
such
estimates
missing
nearly
all
literature
on
U.
mapping.
Here,
by
comparing
available
collected
Moderate
Resolution
Imaging
Spectroradiometer
(MODIS)
Terra/Aqua
satellites
MultiSpectral
Instrument
(MSI)
Sentinel-2A/
2B
for
period
2015–2022,
we
evaluate
MODIS-derived
amounts.
The
relative
found
decrease
with
increasing
individual
images,
ranging
from
58.8%
areal
coverage
(after
pixel
unmixing)
<
50
km2
8.7%
$>$
200
km2.
Such
monthly
composite
because
increased
number
observations,
reducing
3%
total
amount
during
peak
months.
uncertainty
estimates,
terms,
expected
serve
as
a
reference
when
interpreting
temporal
changes
long-term
derived
satellite
data.
