Climate change driven effects on transport, fate and biogeochemistry of trace element contaminants in coastal marine ecosystems
Communications Earth & Environment,
Год журнала:
2024,
Номер
5(1)
Опубликована: Окт. 4, 2024
Язык: Английский
New Insights into the Organic Complexation of Bioactive Trace Metals in the Global Ocean from the GEOTRACES Era
Oceanography,
Год журнала:
2024,
Номер
37(2)
Опубликована: Янв. 1, 2024
The
GEOTRACES
program
has
greatly
expanded
measurements
of
dissolved
trace
metal
concentrations
across
ocean
basins,
but
to
understand
the
behavior
and
cycling
metals
their
impacts
on
primary
productivity,
we
must
chemical
forms
in
which
they
are
present
environment.
Organic
ligands
play
a
central
role
speciation
marine
environment,
controlling
reactivity
bioavailability.
Here,
an
overview
contributions
made
understanding
through
advancing
our
knowledge
distribution,
sources,
sinks
metal-binding
organic
global
ocean,
particularly
for
iron.
Detailed
assessments
intercalibration
methods
most
commonly
applied
have
allowed
integration
ligand
datasets.
Work
characterize
specific
groups
within
wider
pool
matter,
along
with
sources
sinks,
is
starting
unravel
biogeochemical
cycles.
Recent
advances
complementary
analytical
techniques
using
liquid
chromatography
mass
spectrometry
molecular
picture
bioavailability—and
also
pose
new
questions.
Moving
forward,
need
address
gaps
how
complexation
relates
bioavailability
order
recognize
distributions
productivity
carbon
cycle.
Язык: Английский
Dynamic ice–ocean pathways along the Transpolar Drift amplify the dispersal of Siberian matter
Nature Communications,
Год журнала:
2025,
Номер
16(1)
Опубликована: Апрель 14, 2025
Abstract
The
Transpolar
Drift
(TPD)
plays
a
crucial
role
in
regulating
Arctic
climate
and
ecosystems
by
transporting
fresh
water
key
substances,
such
as
terrestrial
nutrients
pollutants,
from
the
Siberian
Shelf
across
Ocean
to
North
Atlantic.
However,
year-round
observations
of
TPD
remain
scarce,
creating
significant
knowledge
gaps
regarding
influence
sea
ice
drift
ocean
surface
circulation
on
transport
pathways
associated
matter.
Using
geochemical
provenance
tracer
data
collected
over
complete
seasonal
cycle,
our
study
reveals
substantial
spatiotemporal
variability
dispersal
matter
along
TPD.
This
reflects
dynamic
shifts
contributions
individual
rivers
they
integrate
into
large-scale
current
system,
followed
their
rapid
extensive
redistribution
through
combination
ice–ocean
exchanges
divergent
drift.
These
findings
emphasize
complexity
highlight
challenges
forecasting
dynamics
light
anticipated
changes
extent,
river
discharge,
patterns.
Язык: Английский
Dissolved copper enrichment in the Gulf of Mexico is driven by freshwater inputs, sedimentary fluxes, and cross-shelf exchange induced by Loop Current eddies
Frontiers in Marine Science,
Год журнала:
2025,
Номер
12
Опубликована: Май 14, 2025
In
the
ocean,
copper
functions
as
an
essential
micronutrient
for
primary
producers
but
becomes
toxic
if
its
concentration
exceeds
their
cellular
requirements.
The
distribution
of
is
strongly
controlled
by
external
inputs
and
physical
dynamics,
especially
in
marginal
seas
with
benthic,
fluvial,
or
aeolian
sources.
We
present
spatial
dissolved
(dCu)
a
quasi-zonal
transect
(25°
N)
spanning
Gulf
Mexico
(GoM)
from
Loop
Current
east
to
continental
slope
west.
dCu
profiles
off
were
recorded
within
decaying
anticyclonic
eddy
(LCE)
named
Nautilus.
contrast,
central
GoM,
measured
on
outside
LCE
Olympus,
which
had
recently
detached
Current.
vertical
was
similar
that
Atlantic
Ocean,
reflecting
origin
water
entering
GoM.
High
concentrations
surface
waters
GoM
associated
dCu-rich
freshwater
Mississippi
River
transported
offshore
(>400
km)
Olympus.
However,
we
identified
clear
gradient
waters,
increasing
towards
region
Nautilus
western
also
exhibited
highest
significantly
greater
than
those
adjacent
Ocean.
This
conspicuous
enrichment
attributed
enhanced
off-shelf
transport
Nautilus,
addition
benthic
shelf
slope,
atmospheric
fluxes
at
remineralization
organic
matter
column
playing
minor
roles.
Our
findings
demonstrate
interaction
mesoscale
eddies
margin
acts
mechanism
exchange
between
coastal
zone
deep-water
capable
shaping
Язык: Английский
Characterization of polyphenols and carbohydrates exuded by Phaeodactylum tricornutum diatom grown under Cu stress
Scientific Reports,
Год журнала:
2024,
Номер
14(1)
Опубликована: Апрель 23, 2024
This
study
is
focused
on
analysing
polyphenols
and
carbohydrates
released
by
Phaeodactylum
tricornutum
(P.
tricornutum)
diatoms
cultured
in
natural
seawater
enriched
with
sublethal
lethal
Cu
doses.
concentrations
of
0.31,
0.79
1.57
µM
reduced
cell
densities
37,
82
91%,
respectively,
compared
to
the
control.
The
total
sum
all
identified
cells
grown
under
levels
increased
up
18.8
107.4
times,
data
from
a
control
experiment.
Four
different
vitro
assays
were
used
estimate
antioxidant
activities
extracellular
compounds:
2,2-diphenyl-1-picrylhydrazyl
(DPPH)
radical
inhibition,
cupric
ion
reducing
capacity
(CUPRAC),
ferric
power
complexing
ability
(CCA).
highest
observed
treatments,
where
CCA
assay
exhibited
greater
increase
(up
32.2
times
higher
than
that
found
experiment)
reduce
concentration
free
medium
its
toxicity.
presence
stimulated
release
as
detoxification
mechanism
survive
regulating
speciation.
Язык: Английский