«We have analyzed the transition from the last glacial period until
our present warm interglacial period, and the climate shifts are happening suddenly, as if someone had pushed a button,» said Dahl - Jenson.
The last two abrupt warmings at the onset of
our present warm interglacial period, interrupted by the Younger Dryas cooling event, are investigated in high temporal resolution from the Greenland NGRIP ice core.
Not exact matches
These remains confirm that the deposits date to a
warm period of climate around 420,000 years ago, the so - called Hoxnian
interglacial, when the climate was probably slightly
warmer than the
present day.
Importantly,
present day slopes are much steeper than the
interglacial warm onsets even on the polar Antarctic datasets.
a)
present day
warming trends and
interglacial plateau trends.
Wilmot McCutchen (26)-- We also know that during the previous
interglacial, the Eemian, that global temperatures were about 2 K
warmer than «at
present», i.e., 1950s, and during that time considerable melt occurred in Greenland (and probably some of WAIS), resulting in a 4 — 6 m sea highstand (different in different locations).
However, although the Arctic is still not as
warm as it was during the Eemian
interglacial 125,000 years ago [e.g., Andersen et al., 2004], the
present rate of sea ice loss will likely push the system out of this natural envelope within a century.
During this period, global temperatures were 1.5 - 2.0 °C
warmer than the peak warmth of the
present interglacial, or Holocene, in which we are now living.
For my part, I have studied the oceanographic and biological consequences of abrupt climate
warming in the very recent glacial and
interglacial climates of the Late Pleistocene (from 20,000 years ago to the
present).
Study «finds Greenland was resistant to melting during last
interglacial, despite temps much
warmer than
present.
Ice ages have occurred in a 100,000 - year cycle for the last 700,000 years, and there have been previous
interglacials that appear to have been
warmer than the
present despite lower carbon - dioxide levels.
Also so far it has likely been
warmer than
present at other points in the Holocene, and in previous
interglacials.
we're freezing our tukuses off worrying about global
warming???? thank GOD we're in an
interglacial period at
present.
would then today's serious climatologists and glaciologists be wringing their hands and getting grayhaired because they wouldn't be able to come up with a natural Milankovic type or other explanation for the
present post-LIA
interglacial warming of the world and imminent disappearance of Tuvalu?
In the 10,000 years of the
present interglacial period between ice ages, the temperature has been
warmer than today about two - thirds of the time.
«The fact that this ice survived the
interglacials about 120,000 and 400,000 years ago, which we think were
warmer than
present, really illustrates how stubborn permafrost can be in the face of climate
warming,» Mr. Froese said.
Since the onset of the Northern Hemisphere glaciation (~ 2.7 million years ago), Earth's climate has undergone large transitions between cold «glacial» and
warm «
interglacial» (e.g.,
present - day) stages.
During the last
interglacial about 125,000 years ago, when global average temperatures were not substantially
warmer than at
present, sea level was 4 - 6 meters (about 13 to 20 feet) higher than at
present.
Our estimated sea levels have reached +5 to 10 m above the
present sea level during recent
interglacial periods that were barely
warmer than the Holocene, whereas the ice sheet model yields maxima at most approximately 1 m above the current sea level.
You seem to me not be addressing the primary argument which I raised in my initial comment here: if the recent rise in CO2 is mostly the result of
warming, then the substantially
warmer previous
interglacial should have produced higher CO2 levels than at
present, but did not; the CO2 levels were much lower.
Clark & Huybers [76] fit a polynomial to proxy temperatures for the Eemian, finding
warming as much as +5 °C at high northern latitudes but global
warming of +1.7 °C «relative to the
present interglacial before industrialization».
Russian astro - physicist Milankovich developed the understanding of the combinations of these cycles and how they interact to create out 30ma trend of long gradually declining ice ages interspersed with relatimely brief global
warm interglacials (like our
present).
For example that the global temperature during the previous
interglacial was less than 1 degree
warmer than the
present one.
Yet he chooses not to explain the last ice age and
warming that has given us the
present interglacial of the last 12,000 years, let alone the MWP and Little Ice Age.
The deep Atlantic chemical changes were similar in magnitude to those associated with glaciations, implying that the canonical view of a relatively stable
interglacial circulation may not hold for conditions
warmer / fresher than at
present.
During the Last
Interglacial Period (about 129,000 to 116,000 years ago) when peak global warmth was not more than 2 °C above pre-industrial temperatures, and peak global annual sea surface temperatures were 0.7 [0.1 to 1.3] °C
warmer (medium confidence), maximum GMSL was at least 5 m higher than at
present (very high confidence), but did not exceed 10 m (high confidence).
Skipping past the inconsistency in the text where he says that until now the best estimate for the last
interglacial temperature in Antarctica was +3 °C (compared to
present) while his «Gore curve» has a zero anomaly compared to today, let's look at the justification for the new «true» estimate of +6 °C
warmer.