SSRN Electronic Journal,
Journal Year:
2022,
Volume and Issue:
unknown
Published: Jan. 1, 2022
Brown
carbon
(BrC)/water-soluble
organic
(WSOC)
is
a
light-absorbing
aerosol
tha
has
significant
impact
on
atmospheric
photochemistry
and
climate
effects.
Many
studies
light
absorbing
characteristics
of
BrC
have
been
carried
out
in
cities
over
the
Guanzhong
Basin
(GB),
including
radiative
forcing,
optical
properties
sources.
However,
research
Qinling
Mountains
still
lacking.
Therefore,
PM
2.5
samples
were
collected
at
northern
piedmont
(QL)
Xi'an
(XN)
winter
2020,
radiation
effects
water
extracts
analyzed
evaluated.
The
mass
absorption
efficiency
(MAE)
WSOC
365
nm
(MAE
)
obtained
QL
XN
0.18
±
0.03
m
2
g
−1
0.78
0.96
,
respectively.
In
ultraviolet
range,
relative
to
elemental
(EC)
6.7%
33.4%
XN,
respectively,
simple
forcing
(SFE
280-400
0.71
0.43
2.82
1.71
W
XN.
It
may
important
balance
regional
systems.
Two
humic-like
substances
protein-like
identified
two
one
substance
QL.
Humus-like
play
dominant
role
sites
(71.13%
52.61%).
fluorescence
index
revealed
that
chromophores
had
autogenous
matter
was
mostly
newly
generated.
Furthermore,
molecular
weight
aromatic
degree
higher
than
QL,
indicating
greater
capacity
for
absorption.
Atmospheric Research,
Journal Year:
2022,
Volume and Issue:
281, P. 106499 - 106499
Published: Nov. 2, 2022
Brown
carbon
(BrC)
is
a
light-absorbing
aerosol
component
that
has
significant
impact
on
atmospheric
photochemistry
and
climate
effects.
Many
studies
light
absorbing
characteristics
of
BrC
(such
as
fraction
water-soluble
and/or
water-insoluble)
have
been
carried
out
in
cities
over
the
Guanzhong
Basin,
including
radiative
forcing,
optical
properties
sources.
However,
research
Qinling
Mountains
still
lacking.
Therefore,
PM2.5
samples
were
collected
at
northern
piedmont
(QL)
Xi'an
(XN)
winter
2020,
radiation
effects
water
extracts
analyzed
evaluated.
The
mass
absorption
efficiency
(MAE)
organic
(WSOC)
365
nm
(MAE365)
obtained
QL
XN
0.18
±
0.03
m2
g−1
0.78
0.96
g−1,
respectively.
In
ultraviolet
range,
relative
WSOC
to
elemental
(EC)
was
6.76%
33.41%
XN,
respectively,
simple
forcing
(SFE280–400)
0.71
0.43
2.82
1.71
W
XN.
It
may
important
balance
regional
systems.
chromophores
are
mainly
composed
humic-like
protein-like
substances,
humus-like
substances
play
dominant
role
two
sites
(52.61%
71.13%).
Biomass
combustion
limited
contribution
chromophore
abundance
QL,
which
more
affected
by
urban
transmission.
fluorescence
index
revealed
had
autogenous
matter
mostly
newly
generated.
Furthermore,
molecular
weight
aromatic
degree
higher
than
indicating
greater
capacity
for
absorption.
This
work
will
be
instrumental
assessing
interaction
influence
between
city
improve
capability
air
pollution
prevention
control
Basin.
Journal of Marine Science and Engineering,
Journal Year:
2022,
Volume and Issue:
10(7), P. 890 - 890
Published: June 28, 2022
The
concentrations
of
total
dissolved
iron
(TdFe)
and
reactive
(DrFe)
in
the
Northern
coastal
China
seawater
(Yantai
Sishili
Bay)
2018
were
determined
using
cathodic
stripping
voltammetry
(CSV).
It
was
found
that
while
TdFe
ranged
from
27.8
to
82.0
nM,
DrFe
changed
a
much
narrower
range
6.8
13.3
nM.
annual
mean
also
7.1
12.6
nM
at
12
sites
monitored
over
4
years
study
(2017–2020).
Considering
obvious
changes
temperature
(T),
chlorophyll
(Chl
a)
contents
higher
May,
July
September
than
March
November),
nutrients
year
this
zone,
consumption
expected;
supplement
observed
may
have
resulted
transformation
strong
organically
complexed
by
photoreduction
cell
surface
reduction.
Additionally,
pre-liminary
conclusion
drawn
based
on
theoretical
calculation
Fe*
concentration
sufficient
meet
phytoplankton
demand.
