A simple rule can accurately predict when Earth's climate
warms out of an ice age, according to new research led by UCL.
The earth is
warming out of an ice age.
Not exact matches
As temperatures
warm, the Arctic permafrost thaws and pools into lakes, where bacteria feast on its carbon - rich material — much
of it animal remains, food, and feces from before the
Ice Age — and churn
out methane, a heat trapper 25 times more potent than carbon dioxide.
The next 6 decades to 1949 are all
warming as temperatures climb
out of the Little
Ice Age, from about 9.1 to 9.6 degrees C.
The next 6 decades to 1949 are all
warming as temperatures climb
out of the Little
Ice Age, (when the Thames froze) from about 9.1 to 9.6 degrees C. For the last 6 decades, to 2009, we are looking for the impact (or non-impact)
of exponentially increasing CO2.
The next 6 decades to 1949 are all
warming as temperatures climb
out of the Little
Ice Age, from about 9.1 to 9.6 degrees C. For the last 6 decades, to 2009, we are looking for the impact (or non-impact)
of exponentially increasing CO2.
The next 6 decades to 1949 are all
warming as temperatures climb
out of the Little
Ice Age, (when the Thames and the sea froze) from about 9.1 to 9.6 degrees C.
It also shows, consistently, that nobody is trying to «get rid
of the medieval
warm period» or «flatten
out the little
ice age» since those are features
of all reconstructions
of the last 1000 to 2000 years.
Though an additional key, which people that are dead and determined to label this as shear man made global
warming need to remember we are coming
out of a mini
ice age (1400 - 1800ish).
However, it leads primarily to the onset
of ice ages or cool periods rather than a
warmer period (due to volcanic ash that blocks
out the sun).
So now I answer the «
ice -
age» denialist argument (denialists usually trot
out ALL their inconsistent & contradictory arguments) this way: I draw a sine - wave in the air with my hand, saying, yes, that the normal fluctuation over a long geological timeframe is to alternate between cold
ice ages and
warm interglacial periods, and that now we are right here in a
warm interglacial period (my hand raised at the top
of the wave), and if there were no human GHGs, then we would expect that over a long time frame we'd be sliding down into an
ice age.
Before that I had read science fiction novels and seen a couple
of movies that predicted
warming and melting... But anyway, after the cooling hypothesis came
out (it certainly wasn't impossible given that
ice ages were cyclic), I decided to naively think up a mitigation strategy.
It is true that during
ice ages the oceans took up more CO2 and that is why there was less in the atmosphere, and during the
warming at the end
of glacial cycles that CO2 came back
out of the ocean, and this was an important amplifying feedback.
The well - known transition from the relatively
warm Medieval into the «little
ice age» turns
out to be part
of a much longer - term cooling, which ended abruptly with the rapid
warming of the 20th Century.
The
warming rate coming
out of the last
ice age was about a degree per millennium and sea level rose about 2m per century.
A drop in volcanic activity caused
warming «There is no question the Earth has been
warming; it is coming
out of the «Little
Ice Age».
Panelist and Colorado State University professor
of atmospheric science William M. Gray, a hurricane authority, announced that he thinks that the biggest contributor to global
warming is the fact that «we're coming
out of a little
ice age,» and that the
warming trend will end in six to eight years.
His Hockey Stick model wiped
out both the Medieval
Warming Period and the Little
Ice Age, both
of which were well documented in history, literature, art and science.
Ok, what was the nudge that moved the world
out of the medieval
warm period into the little
ice age, and what moved it
out of the little
ice age?
We had a «little
ice age» for a few hundred years that we started coming
out of around 1750, and have been
warming to what it was before that period.
There hasn't been a millennial
warming trend since the one at the beginning
of the Holocene that got us
out of the last
Ice Age.
For example, we are
warming far too fast to be coming
out of the last
ice age, and the Milankovitch cycles that drive glaciation show that we should be, in fact, very slowly going into a new
ice age (but anthropogenic
warming is virtually certain to offset that influence).
Global
warming began 18,000 years ago as the earth started
warming its way
out of the Pleistocene
Ice Age — a time when much of North America, Europe, and Asia lay buried beneath great sheets of glacial i
Ice Age — a time when much
of North America, Europe, and Asia lay buried beneath great sheets
of glacial
iceice.
If you are concerned about planetary climate, then it behooves you to consider the «history»
of the planet before singling
out something as paltry as the
warming since the end
of the Little
Ice Age.
Since then the planet has been clawing its way
out of the Little
Ice Age during a period
of gentle global
warming.
The problem I have with the «coming
out of the Little
Ice Age» argument (apart from the lack
of any actual mechanism) is that it is now much
warmer than before the LIA started.
The other issue is palaeo - climate: you need
warming other than Milankovitch effects to come
out of ice ages at the required rate.
Things had been
warming up
out of the last
ice age, starting about 15,000 years ago.
Small wonder, then, that the modelers» computer «reconstructions»
of the planet's past climate conveniently wiped
out the well - documented three - centuries - long Medieval
Warming Period, as well as the subsequent 500 years of Little Ice Age — nor is it surprising that their terrifying computer prognostications in the IPCC's 2001 Third Assessment failed to predict the next decade's absence of any global warming trend
Warming Period, as well as the subsequent 500 years
of Little
Ice Age — nor is it surprising that their terrifying computer prognostications in the IPCC's 2001 Third Assessment failed to predict the next decade's absence
of any global
warming trend
warming trend at all.
Skeptics have long been pointing
out that some
of the same alarmists who are now warning
of the Earth's
warming were some 30 years ago warning
of cooling temperatures and a coming
ice age.
Answer: if
warming releases CO2 from the ocean, whether coming
out of an
ice age or when initiated by ACO2, it upsets IPCC's model that the bulge in atmospheric CO2 measured at MLO is all due to man.
My whole point is that we're been coming
out of an
ice age for 18,000 years, so the probability that we're in a
warming spell would seem to be over 50 % at present (climate is always either
warming or cooling).
By «global
warming» these papers don't,
of course, mean the mild
warming of around 0.8 degrees Celsius that the planet has experienced since the middle
of the 19th century as the world crawled
out of the Little
Ice Age.
As the Earth came
out of the
ice age the primary forcing which caused the initial
warming was due to changes in the Earth's orbital pattern.
Before the most recent major
warming out of the last major
ice age, the range
of warming and cooling was much more severe.
Yes, CO2 comes
out of a
warming ocean and that was a positive feedback after the last
Ice Age, but in the last century or so Man has emitted a boatload (twenty times) more than the ocean, and also added some to the ocean, hence a lower pH. Figure that into your carbon budget.
Responding to and in the manner
of KK Tung's UPDATE (and, you can quote me): globally speaking the slowing
of the rapidity
of the
warming, were it absent an enhanced hiatus compared to prior hiatuses, must at the least be interpreted as nothing more than a slowdown
of the positive trend
of uninterrupted global
warming coming
out of the Little
Ice Age that has been «juiced» by AGW as evidenced by rapid
warming during the last three decades
of the 20th Century, irrespective
of the fact that, «the modern Grand maximum (which occurred during solar cycles 19 — 23, i.e., 1950 - 2009),» according to Ilya Usoskin, «was a rare or even unique event, in both magnitude and duration, in the past three millennia [that's, 3,000 years].»
That said, the hiatus since 1998 is
warmer than the previous two hiatus periods (the so called stair step), so this brings us back to wondering about «coming
out»
of the Little
Ice Age.
There was a clear
warming from 1910 to 1940 that was associated with coming
out of the Little
Ice Age.
Half
of the
warming that brought us
out of the Wisconsin
ice age occurred in less than a decade, the other half took 10,000 years.
If the rise in CO2 continues unchecked,
warming of the same magnitude as the increase
out of the
ice age can be expected by the end
of this century or soon after.
Yet before the 70s were
out, temperatures were rising and many
of the soothsayers for a new
ice age were warning
of global
warming instead.
We just came
out of a Little
Ice Age into a natural and normal
warm period, much like the Roman and Medieval Warm peri
warm period, much like the Roman and Medieval
Warm peri
Warm periods.
Lower temperatures = less melting = more
ice = lower temperatures, on and on and until factors # 1 and # 2 rescue us from turning into a giant snowball (or, during the most extreme
ice age, a spate
of volcanic eruptions eventually helped belch
out enough carbon dioxide to
warm the atmosphere and reset the thermostat.)
This feedback system is confirmed by the CO2 record — in the past, the amplifying effect
of CO2 feedback enabled
warming to spread across the globe and take the planet
out of the
ice age.
I was one
of those scientists who was derided as a global
warming skeptic until I pointed
out all scientists must be skeptics and the world had
warmed since 1680 — the nadir
of the Little
Ice Age.
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).
According to the authors, «if you reconstruct temperatures on a global scale — and not just examine Antarctic temperatures — it becomes apparent that the CO2 change slightly preceded much
of the global
warming, and this means the global greenhouse effect had an important role in driving up global temperatures and bringing the planet
out of the last
Ice Age.»
I agree that we need to cut unrenewable energy consumption, but when I saw that chart them years ago, I realized that we are in a cooler era in our history, just coming
out of a mini
ice -
age, and that periods
of global
warming and cooling have been taking place longer than we've been around to notice it.
What about the claim that we are still coming
out of an
ice age, and that this explains some
of the
warming?