Sentences with phrase «ice age and»

In the early 1960s, I commenced reading reports from scientists predicting a coming ice age and also those who proclaimed Arrhenius was right.

In this case, the authors have produced a testable forecast of the past climate by leaving out the period between the end of the last ice age and up to 4000 years before present.

> 32, Alex, Little Ice Age The Little Ice Age and the Medieval Warming were named by people experiencing the local climate in parts of Europe.

That's comparable to the difference between an ice age and an interglacial.

We can compare the temperature and Albedo in a Medieval Warm period to the temperature and Albedo in a Little Ice Age and we will have a valid experiment that we can compare to modern time.

The current interglacial period is getting long in tooth so again by any sane measure we should be worried about an impending ice age and if there is any merit whatsoever in anthropogenic global warming we should be glad for it and try to get as much of it as we can in the hope that it might delay the inevitable return of glaciers a mile thick covering everything north of Washington, D.C.

It seems to me that unless a climate model can both calibrate the Medieval Warm Period and the Little Ice Age and then validate the 20th and 21st Century true (un-manipulated) temperatures using all of the known influencing factors, it can not be claimed that such a model is a representative simulation of earth's climate.

«Global Signatures and Dynamical Origins of the Little Ice Age and Medieval Climate Anomaly» goes into considerable detail on both topics with numerous graphics.

have been made to test this range against paleo - data for the ice age and Cretaceous, yielding approximately the same range with a «best guess» sensitivity of about 2.0 - 3.0 ° C.

Some modest knowledge of history brought to mind frost fairs on the Thames and the Little Ice Age and the Maunder Minimum without sunspots during the 17th century.

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.

We also learnt about the little ice age and other cold periods and the Fairs held on the Thames and some of us have even seen the odd Breughel painting.

The Recovery from the Little Ice Age and The Recent Halting of the Warming.

According to James Hansen, the transition between an ice age and an interglacial gives a change in albedo forcing of 3.5 W / m2, CO2 change gives around 2 W / m2.

If you look again at my NCM you will see that by attributing an influence to the sun a large number of real world observations fit into a coherent overall picture going back into the last ice age and potentially back to the first formation of the oceans.

Without further feedbacks (positive or negative), the influence of CO2 on temperature is about 3 °C / 280 ppmv, or near 1 °C / 100 ppmv, which is the difference in CO2 level between an ice age and an interglacial.

Regardless how imprecise dating of individual events is, there was period when temperature was already elevated after the last ice age and CO2 was not yet elevated.

We are presently in an interglacial period of an ice age and the climate has been warming, naturally, for about 16, 000 years, as it has before.

The difference between global temperatures during an Ice Age and an ice - free period is only about 5ºC.

With tens of millions of years without an ice age and with continents so open as to allow for general warming everywhere.

You get the impression we could be in the middle of another ice age and the penny still would not drop.

One sees clear indications of long - term changes discussed above, with CO ² and proxy temperature changes associated with the last ice age and its transition into our present interglacial period of warmth.

Temperature is in a cycle that does go from warm like a Medieval Warm Period to Cold like a Little Ice Age and this cold, warm, cold warm cycle does repeat in a cycle that is on the order of 800 to 1000 years.

• Another person mentioned the Little Ice Age and the Medieval Warm period.

For his part, Taylor dismisses «alarmist propaganda that global warming is a human - caused problem that needs to be addressed,» and suggests that taking action to reduce emissions could cause a return to the «the Little Ice Age and the Black Death.»

Global signatures and dynamical origins of the Little Ice Age and Medieval Climate Anomaly.

However, considered as an ensemble of individual expert opinions, the assemblage of local representations of climate establishes both the Little Ice Age and Medieval Warm Period as climatic anomalies with worldwide imprints, extending earlier results by Bryson et al. (1963), Lamb (1965), and numerous intervening research efforts.

Salby noted in his podcast that the earth has been warming since the little Ice Age and continues to do so today.

A bit of mixing, we're in an ice age and it will be a long time before today's temps are recovered.

Sea levels are rising and falling due to techtonic plates squashed after the last ice age and due to their constant (in geological time) movement.

Over that time, the globally averaged temperature difference between the depth of an ice age and a warm interglacial period was 4 to 6 °C — comparable to that predicted for the coming century due to anthropogenic global warming under the fossil - fuel - intensive, business - as - usual scenario.

The thing about the Little Ice Age and all the other stages of the millennial scale cycle is that the beginnings and ends if each stage are difficult to identify.

Part 1 looks at the period of the last ice age and through the events leading up to the Roman Empire 2000 years ago.

Earlier research, based on deep sea sediments deposited between the last Ice Age and the present warm period, has found evidence of eight melting events in the region, the largest occurring 14,700 years ago.

Suppose that you mark the initial conditions that lead to different climates by red for Europe, green for Jurrasic Park, and blue for Ice Age and now draw a little circle around some starting points.

The hockey stick pattern also shows up in the following papers: «Medieval Warm Period, Little Ice Age and 20th century temperature variability from Chesapeake Bay» «Inter-hemispheric temperature variability over the past millennium»

I forgot to include the link for the sea ice age and buoy drift animation I referred to above.

There IS a heat source and a physical reality, that requires no forcing to give it super powers as with puny CO2 the palnts gobble up as much as they can get of, in fact.And explains the stable ice age and the Milankovitch linked interglacials, and how that sawtooth between repeated and predicatble limits can be driven using known energy sources, specific heats and masses, plus simple deterministic physics, no statistical models or Piltdown Mann data set approaches.

In response to your question I would refer you to my comment above Dave Wendt (14:39:39): where I discuss the Rigor and Wallace paper of 2004 which demonstrated that the decline in sea ice age and thickness began with a shift in state in Beaufort Gyre and the TransPolar Drift in 1989 which resulted in multiyear ice declining from over 80 % of the Arctic to 30 % in about one year and that the persistence of that pattern has been responsible for the continuing decline.

Minor warming from the Little Ice Age and its attendant impacts on other climatic parameters reflect an improvement of worldwide climate.

By studying rocky debris piled up during the Little Ice Age and then left behind as the glaciers retreated after 1750 the researchers have been able to chart their progress.

A new paper Global Signatures and Dynamical Origins of the Little Ice Age and Medieval Climate Anomaly (Mann et al 2009)(see here for press release) addresses this question, focusing on regional temperature change during the Medieval Warm Period and Little Ice Age.

And natural variability includes recovery from Little Ice Age and other cycles in global temperature - and / or error in measurement.

The rising trend has been there since the end of the little ice age and before CO2 started rising.

Just ask the dinosaurs or remember the ice age and how huge glaciers melting and moving formed our Great Lakes.

Bob, Here is my assessement and why to the evidence that I have been able to explore that we are into an Ice Age and the tipping point was when the salt in the ocean started to change.

To take an extreme example, suppose CO2 levels double but we fall into an ice age and the temp goes down 10 degrees.

And by the way, what caused the little ice age and the Mideval climate optimum?

I think that there are good reasons to think that a persitent warming of deep ocean has been going on since tha last ice age and continuing now.

Dr Mann of all people should have been humble since his study contradicted dozens of non tree ring studies done before and after as well as written accounts of sailors and farmers which attest to the little ice age and the medieval warming period.