Sentences with phrase «in ice core»

The method used to determine the isotopic ratios in ice core gases is by sublimating all ice under vacuum over a cryogenic trap and subsequent sublimating all ingredients step by step.

There is no corresponding change in the ice core record for Antarctica, therefore that «abrupt change» was not global

Also, I don't see how you can pass over the fact that, 1) the atmosphere in any ice core is locally derived, not global, and 2) the ice - bubble gas is a proxy for the originating atmosphere, not a direct measurement of that atmosphere.

They report larger variations in measured CO2 with per - cm vertical distance in younger ice earlier in an ice core clathrate zone, and smaller variations in older ice at deeper core, consistent with increasing homogeneity with time.

You can see this in the Ice Core Data.

These do not address the issue of the distrust in ice core data resulting from the mismatch between the Vostok records and the Keeling Curve.

The value of 280 ppm is chosen as representative of pre-industrial air because it is close to the average of CO2 measured and dated with high time resolution between the years 1000 and 1800 in an ice core from Law Dome, Antarctica.

And in AR4 FAQ 6.1, IPCC timidly admits that CO2 lags temperature by «some hundreds of years» (actually about a millennium) in the ice core record.

Wrhoward, 8/25/14 @ 7:47 pm, corrected 8/26/14 @ 12:45 am, makes a sweeping accusation that the statements in my fourth reason for having confidence in ice core data «are simply not correct».

Milankovitch removed 40 watts per meter squared from the Northern Hemisphere, above 60 degrees and added 40 watts per meter squared to the Southern hemisphere below 60 degrees over the past ten thousand years and the temperatures recorded in the ice core data in Greenland and Antarctic did stay in the same bounds.

And if Middleton's minimum closure time estimate of 30 years is correct then fluctuations similar to the rise in the Mauna Loa data would be more than halved in the ice core data.

That shows up in the ice core data for Greenland and Antarctic.

This ice has a cycle that is very clearly documented in the ice core data and other proxies.

Early in my research I came across the topic of CO2 lagging behind the temperature data in the ice core data.

This means that the warmer the oceans are near the location of the glaciers or ice sheets, the more heavy oxygen there is in the ice core.

There appear to be no significant CH4 - excursions in ice core records of Antarctica or Greenland during these time periods which otherwise might serve as evidence for a massive release of methane into the atmosphere from degrading permafrost terrains.

In ice core and geological records, «before present» generally means before 1950.

The CO2 in short gets depleted in ice core measurements and has not been corrected properly.

Warmer water closer to the glacier will cause increased heavy in the ice core, even if the temperature is constant.

When I point out that in the ice core data shows that temperature rises 800-1000 years before CO2, I am met with blank stares, or I am asked to prove it I can cite at least 6 peer reviewed study and cite the page number in the IPCC report where that is stated.

The classic paleothermometer is the stable - isotopic composition of water in the ice core (10).

That is in the Ice Core Data.

The evidence for this is in the ice core data.

14C & 10Be are laid down in ice core and tree data and both follow the same trend.

The dark band in this ice core from West Antarctica is a layer of volcanic ash that settled on the ice sheet approximately 21,000 years ago.

The reason is that by the time of the movie, better instrumentation and lab procedure had shown that temperature increases in the ice core data actually preceeded CO2 increases by 800 or more years.

Modeled preindustrial variations in atmospheric δ13C are small compared to the uncertainties in ice core δ13C data.

In the ice core records there is no event that caused non-temperature rise related CO2 increases, this is why that particular record does not contain an analogue to today's warming.

In no ice core record does the carbon dioxide rise precede temperature rise.

The researchers did not notice an obvious relationship between the accumulation of ice recorded in the ice core and glacial fluctuation.

In the ice core record, «present» is 1950.

This cycle is clearly in the ice core data for Greenland and the Antarctic.

If increased atmospheric CO2 causes increased global ground temperature, I would at least expect some incidents in the ice core records where a significant rise in CO2 was the initial cause of a significant temperature rise.

Mind you, just about everything that I think I know about the future of climate is based on the temperature history that is in the ice core data.

We are at or near the upper boundary of temperature as shown in the ice core data for the past ten thousand years.

Let us leave that as a rhetorical flourish on your part and assume that you understand that changes in CO2 lag temperature in the ice core record by approximately 800 years.

The 800 year lag is observed in ice core records following (and prior to) Glacial Minima (Gm).

Can you point to any published analysis that shows CO2 provides the dominant temperature feedback in the ice core record?

And about the 80 year «assumed» lag, he has never heard that there is a diffence in age of the ice layers and the average age of the enclosed gas bubbles at the same depth in an ice core?

-LSB-...] see this again in the ice core record going back thousands of years (as I noted in this post).

Can anyone point me to literature about how we know that everything in the ice core keeps the same relative depth, or if it is known not to, how measurements are adjusted to acount for differential drift?

These large CO2 deserts cover the northern ice sheets with dust, as is recorded in the ice core data, and the ice sheet albedo is lowered sufficiently so that the next insolation maxima can melt the ice sheets.

Consequently, atmospheric CO2 is increasing ten times faster than any rate detected in ice core data over the last 22,000 years.

You can not find that sort of thing in an ice core.

Two papers report analyses of this deep ice, including the lowest carbon dioxide concentration so far measured in an ice core.

Where is the evidence of some other natural forcing, like the Milankovich cycles that controlled the ice ages (a fine historical example of a dramatic and regular climate cycle that can be read in the ice core records taken both in Greenland and in the Antarctic)?

No, climate change has not been like this for the last ~ 650K + yrs, it is happening faster now than any known global climate change in the ice core records.

There are indications in the ice core records that show the cooling from Toba, but where is the global warming that should have resulted from all the CO2 put into the atmosphere?

Is the aforementioned ~ 9 month lag in CO2 after temperature consistent with the ~ 600 year lag in CO2 after temperature observed in ice core data?

This is consistent with the ~ 600 year lag of CO2 after temperature in the ice core data (Different cycle lengths have different inherent lag times).