Wednesday, December 21, 2022
Wanfa
Wang,
a
former
ERG
International
Visiting
Graduate
Student
from
Tianjin
University,
published
a
new
paper
in
the
Journal
of
Hydrology
describing
his
PhD
research
on
carbon
cycling
in
dam
reservoirs
in
karst
regions.
Co-authors
from
ERG
include
Steph
Slowinski,
Shuhuan
Li
and
Philippe
Van
Cappellen.
Chemical
and
physical
carbonate
rock
weathering
in
karst
regions
supply
large
quantities
of
particulate
and
dissolved
inorganic
carbon
(PIC
and
DIC)
to
rivers
and,
ultimately,
to
the
ocean.
The
growing
number
of
dams
in
karst
regions,
however,
alters
the
riverine
transport
of
PIC
and
DIC
by
enhancing
the
in-reservoir
biogeochemical
cycling
of
inorganic
carbon.
Here,
for
the
first
time,
the
authors
combine
stable
(δ13C)
and
radioactive
(Δ14C)
carbon
isotope
measurements
to
delineate
the
biogeochemical
processes that control
the
spatial
trends
of
PIC
and
DIC
concentrations
(and,
by
extension,
those
of
the
partial
pressure
and
efflux
of
CO2)
throughout
a
karst
river-reservoir
system.
The
study
was
carried
out
in the
Hongjiadu
reservoir,
the
main
reservoir
in
the
upper
reach
of
the
Wujiang
River,
which
is
part
of
the
southern
tributary
system
of
the
Changjiang
River
and
located
in
the
center
of
the
largest
karst
area
in
the
world.
To
download
the
paper,
please
follow
this
LINK.