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
Journal of Geophysical Research Biogeosciences,
Journal Year:
2024,
Volume and Issue:
129(5)
Published: May 1, 2024
Abstract
Rivers
are
important
ecosystems
for
carbon
emissions
and
play
a
crucial
role
in
the
global
cycle.
However,
CO
2
CH
4
from
subtropical
rivers
substantially
under‐represented
global‐scale
estimates.
Here,
we
explored
regional
patterns
of
riverine
dynamics
Pearl
River
basin
with
monsoon
climate.
We
found
that
its
diffusive
showed
decreasing
trend
increasing
stream
order.
Seasonality
was
primarily
driven
by
variations
partial
pressure
(
p
)
gas
transfer
velocities,
which
were
strongly
regulated
hydrology
further
estimated
basin‐wide
fluxes
at
17.8
±
7.4
Tg
C
yr
−1
191.5
139.9
Gg
,
respectively.
When
normalized
to
water
surface,
mean
790.1
8.5
mmol
m
−2
d
respectively,
1.3
2.5
times
higher
than
fluxes,
This
suggests
significance
is
probably
underestimated
because
their
unaccounted
for.
Furthermore,
compared
measured
alkalinity‐based
could
introduce
significant
errors
20%
∼30%
sampling
sites,
underscoring
necessity
direct
measurements
reduce
uncertainty.
study
provides
first
estimate
PRB
through
measurements,
highlights
hydrologic
climatic
factors
governing
emissions.
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
