Sentences with phrase «ice core temperature reconstructions»

Ice core temperature reconstructions such as Dome C are based on the isotopic composition of the ice.

In general, the larger amplitude reconstructions have a better match with independent bore hole and ice core temperature reconstructions.

Not exact matches

«We find many examples of these variations in pre-industrial temperature reconstructions» based on proxies such as tree rings, ice cores, and lake sediment, Lovejoy says.

>... there are still ways of discovering the temperatures of past centuries,... tree rings... Core samples from drilling in ice fields... historical reconstruction... coral growth, isotope data from sea floor sediment, and insects, all of which point to a very warm climate in medieval times.

I've also analyzed data (not conclusions, but raw data) relating to paleoclimate reconstructions such as tree rings, ice cores, and (my personal favorite) borehole temperature profiles.

-- According to several Antarctic ice cores, there was a ~ 10 ppmv drop in CO2 between the MWP and LIA, this points to a ~ 1 K drop in global temperature, which is more in line with the higher variable reconstructions.

It's also clear that there is a mismatch between the temperature reconstructions and the ice core record.

The «hockey stick» describes a reconstruction of past temperature over the past 1000 to 2000 years using tree - rings, ice cores, coral and other records that act as proxies for temperature (Mann 1999).

The amplitudes of the pre-industrial, decadal - scale NH temperature changes from the proxy - based reconstructions (< 1 °C) are broadly consistent with the ice core CO2 record and understanding of the strength of the carbon cycle - climate feedback.

Looking at real temperature reconstructions using ice cores, sediment studies, etc give a very clear context to the whimper of an effect, if any, we as humans are having on temperatures.

Mann's graphic represented a reconstruction of past temperatures, not from thermometers or satellites, but by analysing data from proxies, such as tree - ring width, corals, and ice cores.

Figure 1 Alley's reconstruction is based upon trapped air in ice cores taken from central Greenland and his proxies are calibrated to air temperatures on land.

Therefore, in a subsequent MAGICC run we replaced our ice core — based reconstruction with Sato's [Sato et al., 1993](and updated to present) values after 1970 and compared the model response to NH temperature reconstructions [Intergovernmental Panel on Climate Change, 2007, Figure 6.10] for the past millennium (Figure 4).

Also needs to be pointed out that ice core d18O temperature reconstructions are valid as a global proxy.

Global solar irradiance reconstruction [48 — 50] and ice - core based sulfate (SO4) influx in the Northern Hemisphere [51] from volcanic activity (a); mean annual temperature (MAT) reconstructions for the Northern Hemisphere [52], North America [29], and the American Southwest * expressed as anomalies based on 1961 — 1990 temperature averages (b); changes in ENSO - related variability based on El Junco diatom record [41], oxygen isotopes records from Palmyra [42], and the unified ENSO proxy [UEP; 23](c); changes in PDSI variability for the American Southwest (d), and changes in winter precipitation variability as simulated by CESM model ensembles 2 to 5 [43].

A high correlation with the 60 + year long instrumental temperature record at Faraday station, further up the Antartic peninsula, was used as evidence that the Gomez d18O ice core proxy reconstruction was a valid representation of temperatures in the vincinity of the peninsula.

Figure 3 shows the temperature reconstructions from Antarctic ice cores for the last 420,000 years covering four previous Interglacials.

Note that regional proxies, such as the oxygen - isotope temperature reconstructions from the Greenland Ice Core Project that record Dansgaard - Oeschger events, often indicate faster regional rates of climate change than the overall global average for glacial - interglacial transitions, just as today warming is more pronounced in Arctic regions than in equatorial regions (Barnosky et al., 2003; Diffenbaugh and Field, 2013).

NO correlation on geologic time scales (geocarb reconstructions), and on shorter time scales (ice core reconstructions) where there IS a correlation, it runs IN REVERSE — with CO2 level FOLLOWING temperature changes, UP AND DOWN, like a DOG ON A LEASH.

I have noted this same problem in all papers with the seemingly purposeful exclusion of error bars in reconstructions of ice core and other proxy CO2 and temperature graphs, regardless of which is leading and which is lagging.

Empirical attempts to determine the in situ «sensitivity» of atmospheric temperatures to changes in CO2 from ice - core reconstructions thus run into the obvious problem of separating the effects of these two factors.

He is also deeply involved in ice - sheet modeling with specific developments in areas such as ice core dating and temperature reconstruction based on paleothermometry.

The first is a 100,000 year temperature and CO2 - level reconstruction from ice - core data.

Climate scientists built this reconstruction with a series of «proxies», including tree rings and ice core samples, which (they hope) exhibit properties that are strongly correlated with historical temperatures.