EarthArXiv (California Digital Library),
Год журнала:
2024,
Номер
unknown
Опубликована: Май 15, 2024
Global
ecosystems
face
mercury
contamination,
yet
long-term
data
is
scarce,
hindering
understanding
of
ecosystem
responses
to
atmospheric
Hg
input
changes
and
policy
evaluation.
To
address
this
gap,
study
compiled
a
global
accumulation
flux
database
using
221
cores
from
peat,
lake,
ice,
marine
deposits.
From
1700
2012,
averaged
fluxes
in
deposits
increased
five-fold,
six-fold,
eight-fold,
respectively.
Notably,
lake
peat
generally
mirrored
trends
total
deposition
modelled
by
GEOS-Chem
thus
can
reflect
effects.
For
instance,
the
decreases
post-1950
Europe
evidenced
effective
environmental
policies,
while
rises
East
Asia-Oceania
highlighted
coal-use
impacts,
inter
alia.
Conversely,
sediments
high-altitude
natural
did
not
correspond
well
with
deposition,
emphasising
influences
over
anthropogenic
impacts.
Our
underscores
these
key
regions
for
future
management.
Critical Reviews in Environmental Science and Technology,
Год журнала:
2023,
Номер
53(19), С. 1757 - 1773
Опубликована: Фев. 24, 2023
Distinguishing
the
respective
contributions
of
various
microbes
to
methylmercury
(MeHg)
production
is
critical
for
predicting
MeHg
bioaccumulation
and
exposure
risk.
Metabolic
inhibitors
have
been
commonly
used
block
activity
specific
microbial
groups
identify
primary
Hg
methylating
microbes.
By
reviewing
literatures
our
empirical
data,
we
demonstrate
how
multiple
factors,
including
(1)
addition
inappropriate
amounts
inhibitors,
(2)
a
tendency
overlook
syntrophy,
(3)
absence
comprehensive
proxy
systems
methylation,
would
impact
result
interpretation
this
approach.
We
thus
suggest
that
design
inhibition
assays
should
consider
environmental
properties,
e.g.,
background
levels
electron
acceptors,
concentrations
metabolic
substrates,
abundances
also
recommend
be
added
at
observed
changes
in
methylation
assessed
with
indicators.
Revealing
key
factors
responsible
improper
usage
method
inadequate
results
help
optimize
robust
predictions
nature.
Environmental Science & Technology,
Год журнала:
2023,
Номер
57(43), С. 16512 - 16521
Опубликована: Окт. 19, 2023
Understanding
mercury
(Hg)
complexation
with
soil
organic
matter
is
important
in
assessing
atmospheric
Hg
accumulation
and
sequestration
processes
forest
ecosystems.
Separating
into
particulate
(POM)
mineral-associated
(MAOM)
can
help
the
understanding
of
dynamics
cycling
due
to
their
very
different
chemical
constituents
associated
formation
functioning
mechanisms.
The
concentration
Hg,
carbon,
nitrogen
contents
isotopic
signatures
POM
MAOM
a
deglaciated
chronosequence
were
determined
construct
sequestration.
results
show
that
are
mainly
derived
from
Hg0
deposition.
up
76%
higher
than
broadleaf
forests
60%
coniferous
forests.
vary
vegetation
succession.
Variations
δ202Hg
Δ199Hg
controlled
by
source
mixing
forest.
Accumulation
subsequent
microbial
reduction
enrich
heavier
isotopes
compared
specific
nutritional
role
MAOM.
National Science Review,
Год журнала:
2024,
Номер
11(12)
Опубликована: Ноя. 14, 2024
ABSTRACT
Global
ecosystems
face
mercury
contamination,
yet
long-term
data
are
scarce,
hindering
understanding
of
ecosystem
responses
to
atmospheric
Hg
input
changes.
To
bridge
the
gap
and
assess
responses,
we
compiled
compared
a
accumulation
database
from
peat,
lake,
ice
marine
deposits
worldwide
with
deposition
modelled
by
GEOS-Chem,
focusing
on
trends,
magnitudes,
spatial–temporal
distributions
impact
factors.
The
fluxes
in
all
four
showed
5-
9-fold
increase
over
1700–2012,
lake
peat
that
generally
mirrored
trends.
Significant
decreases
post-1950
Europe
evidenced
effective
environmental
policies,
whereas
rises
East
Asia,
Africa
Oceania
highlighted
coal-use
impacts,
inter
alia.
Conversely,
high-altitude
did
not
align
well
deposition,
emphasizing
natural
influences
anthropogenic
impacts.
Our
study
underscores
importance
these
key
regions
for
future
management.
