Biogeosciences,
Journal Year:
2024,
Volume and Issue:
21(14), P. 3239 - 3250
Published: July 17, 2024
Abstract.
Nitrous
oxide
(N2O),
a
potent
greenhouse
gas
and
ozone-destroying
agent,
is
produced
during
nitrogen
transformations
in
both
natural
human-constructed
environments.
Wastewater
treatment
plants
(WWTPs)
produce
emit
N2O
into
the
atmosphere
removal
process.
However,
impact
of
WWTPs
on
emissions
downstream
aquatic
systems
remains
poorly
constrained.
By
measuring
concentrations
at
monthly
resolution
over
year
Potomac
River
estuary,
tributary
Chesapeake
Bay
eastern
United
States,
we
found
strong
seasonal
variation
fluxes:
were
larger
fall
winter,
but
flux
was
summer
fall.
Observations
multiple
stations
across
estuary
revealed
hotspots
WWTPs.
higher
compared
to
other
(median:
21.2
nM
vs.
16.2
nM)
despite
similar
concentration
dissolved
inorganic
nitrogen,
suggesting
direct
discharge
from
system
or
production
yield
waters
influenced
by
Meta-analysis
measurements
associated
with
globally
variable
influence
emissions.
Since
wastewater
has
increased
substantially
growing
population
projected
continue
rise,
accurately
accounting
for
important
constraining
predicting
future
global
Efficient
removal,
addition
should
be
an
essential
part
water
quality
control
Nature Communications,
Journal Year:
2024,
Volume and Issue:
15(1)
Published: Jan. 31, 2024
Abstract
Lentic
systems
(lakes
and
reservoirs)
are
emission
hotpots
of
nitrous
oxide
(N
2
O),
a
potent
greenhouse
gas;
however,
this
has
not
been
well
quantified
yet.
Here
we
examine
how
multiple
environmental
forcings
have
affected
N
O
emissions
from
global
lentic
since
the
pre-industrial
period.
Our
results
show
that
emitted
64.6
±
12.1
Gg
O-N
yr
−1
in
2010s,
increased
by
126%
1850s.
The
significance
small
on
mitigating
is
highlighted
due
to
their
substantial
rates
response
terrestrial
changes.
Incorporated
with
riverine
emissions,
study
indicates
inland
waters
2010s
was
319.6
58.2
.
This
suggests
factor
0.051%
for
water
relative
agricultural
nitrogen
applications
provides
country-level
factors
(ranging
0
0.341%)
improving
methodology
national
gas
inventories.
Nature Communications,
Journal Year:
2023,
Volume and Issue:
14(1)
Published: Dec. 13, 2023
The
heavily
human-perturbed
coastal
oceans
are
hotspots
of
nitrous
oxide
(N2O)
emission
to
the
atmosphere.
processes
underpinning
N2O
flux,
however,
remain
poorly
understood,
leading
large
uncertainties
in
assessing
global
budgets.
Using
a
suite
nitrogen
isotope
labeling
experiments,
we
show
that
multiple
contribute
production
throughout
estuarine-coastal
gradient,
sustaining
intensive
flux
Unexpectedly,
denitrification,
rather
than
ammonia
oxidation
as
previously
assumed,
constitutes
major
source
well-oxygenated
waters.
Size-fractionated
manipulation
experiments
with
gene
analysis
further
reveal
niche
partitioning
oxidizers
and
denitrifiers
across
particle
size
spectrum;
denitrification
dominated
on
particles
small
particles.
Total
rate
increases
substrate
concentrations,
suggesting
crucial
interplay
between
nutrients
controlling
production.
factors
identified
here
may
help
understand
climate
feedback
mechanisms
human
activity
oceans.
Environmental Science & Technology,
Journal Year:
2023,
Volume and Issue:
57(36), P. 13506 - 13519
Published: Aug. 30, 2023
Nitrous
oxide
(N2O)
is
a
long-lived
greenhouse
gas
and
currently
contributes
∼10%
to
global
warming.
Studies
have
suggested
that
inland
waters
are
large
growing
N2O
source,
but
whether,
how,
where,
when,
why
inland-water
emissions
changed
in
the
Anthropocene
remains
unclear.
Here,
we
quantify
formation,
transport,
emission
along
aquatic
continuum
their
changes
using
spatially
explicit,
mechanistic,
coupled
biogeochemistry-hydrology
model.
The
increased
from
0.4
1.3
Tg
N
yr-1
during
1900-2010
due
(1)
inputs
mainly
groundwater
(2)
production,
largely
reservoirs.
Inland
contribute
7
(5-10)%
total
emissions.
highest
typically
downstream
of
reservoirs
areas
with
high
population
density
intensive
agricultural
activities
eastern
southern
Asia,
southeastern
North
America,
Europe.
expected
continuing
excessive
use
nutrients,
dam
construction,
development
suboxic
conditions
aging
imply
persisting
Abstract
Sustainable
management
of
lakes
requires
us
to
overcome
ecological,
economic,
and
social
challenges.
These
challenges
can
be
addressed
by
focusing
on
achieving
ecological
improvement
within
a
multifaceted,
co‐beneficial
context.
In‐lake
restoration
measures
may
promote
more
rapid
ecosystem
responses
than
is
feasible
with
catchment
alone,
even
if
multiple
interventions
are
needed.
In
particular,
we
identify
methods
that
support
the
overarching
societal
target
circular
economy
through
use
nutrients,
sediments,
or
biomass
removed
from
lake,
in
agriculture,
as
food,
for
biogas
production.
this
emerging
field
sustainable
techniques,
show
examples,
discuss
benefits
pitfalls,
flag
areas
further
research
development.
Each
lake
should
assessed
individually
ensure
approaches
will
effectively
address
lake‐specific
problems,
do
not
harm
downstream
ecosystems,
cost‐effective,
delivery
valuable
services,
minimize
conflicts
public
interests,
eliminate
necessity
repeated
interventions.
Achieving
optimal,
results
relies
multidisciplinary
close
interactions
between
environmental,
social,
political,
economic
sectors.
This
article
categorized
under:
Science
Water
>
Quality
Life
Stresses
Pressures
Ecosystems
Conservation,
Management,
Awareness
