Abstract.
Dissolved
organic
carbon
(DOC)
dynamics
are
evolving
in
the
rapidly
changing
Arctic
and
a
comprehensive
understanding
of
controlling
processes
is
urgently
required.
For
example,
transport
governing
DOC
prone
to
climate
driven
alteration
given
their
strong
seasonal
nature.
Hence,
high-resolution
long-term
studies
required
assess
potential
inter-annual
changes
processes.
In
this
study,
we
monitored
at
30-minute
resolution
from
September
2018
December
2022
headwater
peatland-influenced
stream
Northern
Finland
(Pallas
catchment,
68°
N).
To
multiple
methods
were
used:
concentration
–
discharge
(C-Q)
slope
for
analysis,
modified
hysteresis
index
event
yield
random
forest
regression
models
determine
hydroclimatic
controls
on
transport.
The
findings
reveal
following
distinct
patterns:
(a)
C-Q
relationship
displays
trend,
indicating
increasing
limitation
each
month
after
snowmelt
begins;
(b)
decreases
post-snowmelt,
signifying
influence
distal
sources
mobilization
through
slower
pathways;
(c)
interannual
variations
these
metrics
generally
low,
often
smaller
than
month-to-month
fluctuations.
These
results
highlight
importance
detailed
monitoring
enable
separation
inter
intra
annual
variability
better
understand
complexities
This
study
contributes
broader
comprehension
because
knowledge
gained
regarding
dominant
mechanisms
vital
evaluating
how
cycle
will
change
future
ecosystems.
Climate of the past,
Journal Year:
2025,
Volume and Issue:
21(4), P. 753 - 772
Published: April 4, 2025
Abstract.
Arctic
permafrost
stores
vast
amounts
of
terrestrial
organic
matter
(terrOM).
Under
warming
climate
conditions,
thaws,
releasing
aged
carbon
and
potentially
impacting
the
modern
cycle.
We
investigated
characteristics
biomarkers,
including
n-alkanes,
fatty
acids,
lignin
phenols,
in
marine
sediment
cores
to
understand
how
sources
terrOM
transported
ocean
change
response
varying
environmental
such
as
sea-level
rise,
sea-ice
coverage,
inland
warming,
freshwater
input.
examined
two
records
from
western
Laptev
Sea
(PS51/154
PS51/159)
covering
past
17.8
kyr.
Our
analyses
reveal
three
periods
with
high
mass
accumulation
rates
(MARs)
14.1
13.2,
11.6
10.9,
10.9
9.5
kyr
BP.
These
MAR
peaks
revealed
distinct
sources,
likely
changes
shelf
topography,
warming.
By
comparing
published
other
marginal
seas,
we
suggest
that
enhanced
coastal
erosion
driven
by
rapid
rise
during
meltwater
pulse
1A
(mwp-1A)
triggered
elevated
across
Arctic.
Additional
varied
regionally.
Peaks
Beaufort
Bølling–Allerød
coincided
a
flooding
event,
while
Fram
Strait
Preboreal/early
Holocene
prolonged
ice-free
conditions.
results
highlight
influence
regional
addition
global
drivers,
which
can
either
promote
or
preclude
fluxes.
Hydrology and earth system sciences,
Journal Year:
2024,
Volume and Issue:
28(4), P. 1055 - 1070
Published: Feb. 29, 2024
Abstract.
Dissolved
organic
carbon
(DOC)
dynamics
are
evolving
in
the
rapidly
changing
Arctic
and
a
comprehensive
understanding
of
controlling
processes
is
urgently
required.
For
example,
transport
governing
DOC
prone
to
climate-driven
alteration
given
their
strong
seasonal
nature.
Hence,
high-resolution
long-term
studies
required
assess
potential
interannual
changes
processes.
In
this
study,
we
monitored
at
30
min
resolution
from
September
2018
December
2022
headwater
peatland-influenced
stream
northern
Finland
(Pallas
catchment,
68°
N).
Temporal
variability
was
assessed
using
multiple
methods:
concentration–discharge
(C–Q)
slope
for
analysis,
modified
hysteresis
index
event
yield
random
forest
regression
models
determine
hydroclimatic
controls
on
transport.
The
findings
revealed
following
distinct
patterns:
(a)
C–Q
relationship
displayed
trend,
indicating
increasing
limitation
each
month
after
snowmelt
began;
(b)
decreased
post-snowmelt,
signifying
influence
distal
sources
mobilization
through
slower
pathways;
(c)
variations
these
metrics
were
generally
low,
often
smaller
than
month-to-month
fluctuations.
These
results
highlight
importance
detailed
monitoring
enable
separation
inter-
intra-annual
better
understand
complexities
This
study
contributes
broader
comprehension
Arctic,
specifically
quantifying
associated
mechanistic
drivers,
which
vital
predicting
how
cycle
likely
change
ecosystems.
Water Resources Research,
Journal Year:
2023,
Volume and Issue:
59(11)
Published: Oct. 30, 2023
Abstract
Climate
change
and
permafrost
thaw
may
impact
the
mobilization
of
terrestrial
dissolved
organic
carbon
(DOC),
mercury
(Hg),
neurotoxic
methylmercury
(MeHg)
into
aquatic
ecosystems;
thus,
understanding
processes
that
control
analyte
export
in
northern
catchments
is
needed.
We
monitored
water
chemistry
for
3
years
(2019–2021)
at
a
peatland
catchment
(Scotty
Creek)
mixed
(Smith
Dehcho
(Northwest
Territories),
within
discontinuous
zone
boreal
western
Canada.
The
had
higher
DOC
MeHg,
but
lower
total
Hg
concentrations
(mean
±
standard
deviation;
19
2.6
mg
L
−1
;
0.08
0.04
ng
DMeHg
1.1
0.3
THg
)
than
(12
4.4
0.05
0.01
3.1
2.2
).
Analyte
increased
with
discharge
catchment,
suggesting
transport
limitation
flushing
near‐surface,
organic‐rich
flow
paths
during
wet
periods.
In
contrast,
were
not
primarily
associated
discharge.
MeHg
concentrations,
MeHg:THg,
MeHg:DOC
temperature,
enhanced
methylation
warmer
Mean
open
season
yields
greater
more
variable
from
(1.1–6.6
vs.
1.4–2.4
g
m
−2
5.2–36
6.1–10
Crucial
storage
thresholds
controlling
runoff
generation
likely
drove
inter‐annual
variability
catchment.
Our
results
suggest
climate
influence
production
boreal‐Arctic
as
temperatures
increase,
peatlands
thaw,
altered.
