Scientific Reports,
Год журнала:
2021,
Номер
11(1)
Опубликована: Июль 14, 2021
Abstract
One
of
the
most
common
responses
marine
ectotherms
to
rapid
warming
is
a
reduction
in
body
size,
but
underlying
reasons
are
unclear.
Body
size
reductions
have
been
documented
alongside
events
fossil
record,
such
as
across
Pliensbachian-Toarcian
boundary
(PToB)
event
(~
183
Mya).
As
individuals
grow,
parallel
changes
morphology
can
indicate
details
their
ecological
response
environmental
crises,
resource
acquisition,
which
may
anticipate
future
climate
impacts.
Here
we
show
that
morphological
growth
predator
belemnite
species
(extinct
coleoid
cephalopods)
changed
significantly
over
PToB
event.
Increasing
robustness
at
different
ontogenetic
stages
likely
results
from
indirect
consequences
warming,
like
scarcity
or
hypercalcification,
pointing
toward
varying
tolerances
among
species.
The
this
study
stress
importance
taking
life
history
into
account
well
phylogeny
when
studying
impacts
stressors
on
organisms.
A
long-term
record
of
global
mean
surface
temperature
(GMST)
provides
critical
insight
into
the
dynamical
limits
Earth's
climate
and
complex
feedbacks
between
broader
Earth
system.
Here,
we
present
PhanDA,
a
reconstruction
GMST
over
past
485
million
years,
generated
by
statistically
integrating
proxy
data
with
model
simulations.
PhanDA
exhibits
large
range
GMST,
spanning
11°
to
36°C.
Partitioning
states
indicates
that
more
time
was
spent
in
warmer
rather
than
colder
climates
reveals
consistent
latitudinal
gradients
within
each
state.
There
is
strong
correlation
atmospheric
carbon
dioxide
(CO
Nature Communications,
Год журнала:
2020,
Номер
11(1)
Опубликована: Авг. 10, 2020
Surface
temperature
is
a
fundamental
parameter
of
Earth's
climate.
Its
evolution
through
time
commonly
reconstructed
using
the
oxygen
isotope
and
clumped
compositions
carbonate
archives.
However,
reaction
kinetics
involved
in
precipitation
carbonates
can
introduce
inaccuracies
derived
temperatures.
Here,
we
show
that
dual
analyses,
i.e.,
simultaneous
∆47
∆48
measurements
on
single
phase,
identify
origin
quantify
extent
these
kinetic
biases.
Our
results
verify
theoretical
predictions
evidence
isotopic
disequilibrium
observed
speleothems
scleractinian
coral
skeletons
inherited
from
dissolved
inorganic
carbon
pool
their
parent
solutions.
Further,
thermometry
achieve
reliable
palaeotemperature
reconstructions,
devoid
bias.
Analysis
belemnite
rostrum
implies
it
precipitated
near
equilibrium
confirms
warmer-than-present
temperatures
during
Early
Cretaceous
at
southern
high
latitudes.
Geochimica et Cosmochimica Acta,
Год журнала:
2023,
Номер
350, С. 1 - 15
Опубликована: Март 30, 2023
The
application
of
carbonate
clumped
isotope
(Δ47)
thermometry
in
deep-time
is
often
limited
by
modification
the
original
temperature
signal
thermal
resetting.
New
modeling
approaches
to
estimate
initial
isotopic
composition
partially
reset
calcites
and
maximal
burial
temperatures,
however,
open
promising
avenues
reconstruction.
Such
strongly
depend
on
laboratory-derived
kinetic
parameters
calcite
materials,
which
may
differ
their
microstructure,
water
content
distribution,
minor
trace
element
composition,
thus
have
different
resetting
kinetics.
rostra
belemnites,
an
extinct
group
mollusks
with
a
wide
temporal
spatial
occurrence
Mesozoic,
been
extensively
used
for
paleoclimate
reconstructions
using
oxygen
geochemistry.
Belemnites
are
also
important
targets
isotope-based
reconstructions,
but
found
Δ47
compositions.
Here,
we
present
results
from
heating
experiments
belemnite
rostral
optical
provide
belemnite-specific
We
show
that
altered
faster
at
lower
temperatures
than
all
other
reported
previous
studies.
suggest
fast
exchange
internal
skeletal
as
fluid
inclusions
or
organic-derived
water,
process
completed
within
2–4
min
experimental
here.
Extrapolation
geological
timescales
solid-state
bond
reordering
models
shows
starts
brachiopod,
spar,
calcites.
This
susceptibility
measurable
(+3
°C)
increase
apparent
even
under
shallow
moderate
conditions
(i.e.,
40–50
°C
106–107
years
timescales).
Following
overprint
higher
during
burial,
further
re-equilibrate
exhumation
resulting
decrease
temperatures.
“retrograde
resetting”
similar
what
observed
carbonatites
marbles
cooling,
cause
underestimation
sample
experienced
its
history.
Overall,
our
demonstrate
importance
material-specific
urge
caution
when
interpreting
Δ47-derived
biogenic
carbonates
archives.
Scientific Reports,
Год журнала:
2021,
Номер
11(1)
Опубликована: Сен. 27, 2021
Abstract
Understanding
the
Earth’s
climate
system
during
past
periods
of
high
atmospheric
CO
2
is
crucial
for
forecasting
change
under
anthropogenically-elevated
.
The
Mesozoic
Era
believed
to
have
coincided
with
a
long-term
Greenhouse
climate,
and
many
our
temperature
reconstructions
come
from
stable
isotopes
marine
biotic
calcite,
in
particular
belemnites,
an
extinct
group
molluscs
carbonate
hard-parts.
Yet,
temperatures
reconstructed
oxygen
isotope
composition
belemnites
are
consistently
colder
than
those
derived
other
proxies,
leading
large
uncertainties
around
sea
temperatures.
Here
we
apply
clumped
palaeothermometry
two
distinct
phases
exceptionally
well-preserved
order
constrain
their
living
habitat,
improve
based
on
isotopes.
We
show
that
precipitated
both
aragonite
calcite
warm,
open
ocean
surface
waters,
demonstrate
how
previous
low
estimates
belemnite
calcification
has
led
widespread
underestimation
by
ca.
12
°C,
raising
some
lowest
Jurassic
period
values
which
approach
modern
mid-latitude
Our
findings
enable
accurate
recalculation
global
temperatures,
will
thus
understanding
dynamics.
Fundamental Research,
Год журнала:
2023,
Номер
4(6), С. 1586 - 1593
Опубликована: Май 26, 2023
Globally
elevated
temperatures
during
the
Cretaceous
extreme
greenhouse
climate
interval
were
punctuated
by
Valanginian
cooling
event,
which
was
characterized
a
positive
carbon
isotope
excursion,
global
cooling,
and
glacial
event
approximately
at
135
Ma.
Disentangling
ocean
temperature
continental
ice
volume
trends
enables
us
to
better
understand
fluctuations
over
deep
time.
We
investigated
temperature-ice
sheet
dynamics
of
glaciation
events
that
occurred
in
world.
New
clumped
Lethaia,
Год журнала:
2024,
Номер
57(1), С. 1 - 15
Опубликована: Март 1, 2024
Vertebrate
and
invertebrate
fossils
from
the
Smithian
(Early
Triassic)
to
Early-Middle
Triassic
boundary
interval
of
Svalbard,
Arctic
Norway
have
been
known
for
a
long
time,
but
rarely
extensively
collected
with
precise
stratigraphical
control.
We
describe
new
bulk
collections
precisely
measured
sections
in
Vikinghøgda
Formation
Central
Spitsbergen.
Accompanying
geochemical
data
provide
further
constraints
on
changes
palaeoenvironments.
Species
richness
both
benthos
nekton
remains
low
throughout
studied
reduces
minimum
early
Spathian,
i.e.
wake
late
extinction
probable
associated
short
ice
age
that
straddled
Smithian–Spathian
as
manifested
by
global
hiatus
continental
shelves.
The
faunal
succession
series
indicate
regression
event
followed
deepening
sea
level
Spathian.
This
is
consistent
cooling
phase
has
previously
interpreted
likely
glacio-eustatic
episode.
lowermost
Spathian
marked
near-absence
benthos,
compatible
increased
water
depth
also
possibly
linked
aftermath
Smithian-Spathian
extinction.
lateral
expansion
another
younger
gap
('the
Marmierfjellet
hiatus'
or
middle
age)
here
an
off-shore
condensation
horizon
generated
probably
highest
sea-level
stand
recorded
These
hiatuses
opposite
origin,
well
acute
selective
preservation
carbonate
content
series,
be
factored
out
biases
when
estimating
species
interpreting
palaeo-ecological
changes.
study
identifies
Early
fossil
taxa
Spitsbergen,
particular
Peribositria
sibirica
bakevellid
bivalves.
orthoceratoids
are
reviewed,
two
distinct
identified
at
different
levels.
bioRxiv (Cold Spring Harbor Laboratory),
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 28, 2025
Abstract
Orthoceratoid
cephalopods
are
common
in
the
Palaeozoic
rock
record
but
became
extinct
Late
Triassic.
Many
orthoceratoids
contain
cameral
deposits,
which
enigmatic
calcareous
structures
within
their
chambered
shell
that
presumably
balanced
straight
conchs
a
horizontal
position.
Since
mid-19
th
century,
palaeontologists
have
attempted
to
understand
deposit
formation
process.
The
various
hypotheses
include
growth
from
fluids,
precipitation
by
mantle
or
even
dismissal
as
post-mortem
structures.
All
of
these
previous
interpretations
they
complicated
with
contradictory
evidence.
Here,
we
present
evidence
well-preserved
Trematoceras
elegans
specimens
Triassic
St.
Cassian
Formation
(Dolomites,
northern
Italy).
We
studied
using
optical
and
electron
beam
microanalysis
techniques
argue
deposits
consist
primary
aragonite
calcite
fabrics.
A
fibrous
microstructure,
is
bilaterally
symmetrically
arranged
irregularities,
documented.
Thin
organic
sheets
originally
delimited
radial
sectors.
Based
on
observations,
propose
new
model
explicitly
involves
sheets.
These
acted
an
extension
pellicle
held
thin
film
supersaturated
liquid
otherwise
emptied
chambers
via
capillary
effect.
Ions
were
supplied
through
siphuncle,
such
living
Nautilus
,
enabled
This
goes
beyond
interpretations,
resolves
observations
has
functional
implications,
suggesting
adaptation
increased
rates.