Sentences with phrase «ice core proxy shows»

Study: Ammonium as ice core proxy shows strong Medieval Warm Period in the tropics.

Not exact matches

Note that Figure 1 shows only the proxy record from the ice core - no instrumental data is included.

Now the locations of avaialble proxy data (tree rings, ice cores, ocean sediment records, corals etc.) are not necessarily optimally spread out, but the spatial sampling error is actually quite easy to calculate, and goes into the error bars shown on most reconstructions.

Your chart shows the difference between the absolute temperature in 1895 as measured using the GISP2 ice core proxy, and the absolute temperature as measured at a nearby location using the thermometers in the 2000s, ie, the difference between the end of the GISP2 icecore and the higher of the two blue crosses in last graph in the original post.

«It potentially does,» admits Jones, but says that analyses using other methods — proxy temperature markers from ice core samples, for example — still show much the same temperature change over the past 1,000 years, backing up Mann's hockey stick.

Independent non-thermometer data (so - called proxies, like tree rings, ice cores, ocean sediments, stalagmites, etc.) also show no warming trend between 1978 and 2000.

Figure: Spaghetti graph showing top - absolute contribution to MBH98 reconstruction (1400 - 1980 for AD1400 step proxies) by the following groups: Asian tree rings; Australia tree rings; European ice core; Bristlecones (and Gaspé); Greenland ice core; non-bristlecone North American tree rings; South American ice core; South American tree rings.

What if Callendar (and the ice cores and other CO2 proxies) overestimated the real CO2 levels in the pre-Mauna Loa period and / or the temperature in reality was higher than Hadcrut3 shows?

This «new evidence» is based on a single analysis of «proxy» data (that is, data that do not come from thermometers but rather from sources like tree rings, ice cores, corals, and ocean and lake sediments) showing the twentieth century to be the warmest in the past thousand years.

Tree rings, coral skeletons, and glacial ice cores (Figure 3) are proxies for annual temperature records, while boreholes (holes drilled deep into Earth's crust) can show temperature shifts over longer periods of time.

Nancy, there are higher resolution proxies, such as the Vostok Ice Core, which do in fact show lots of temperature spikes.

However, studies of paleoclimate proxies, such as tree rings and ice cores, have shown that oscillations similar to those observed instrumentally have been occurring for at least the last millennium.

Note that Figure 1 shows only the proxy record from the ice core - no instrumental data is included.

Figure 9a shows that all the proxy (for p.CO2) are different from ice cores, some of them — much -LRB-!).

Also, some proxies show here that the last 3 million years, p.CO2 often could be similar — or higher — than the present (also in the period in which we have data from ice cores).

Most of these proxies don't extend as far back in time as the Antarctic ice cores, but many do extend back to the last glacial - interglacial transition which began approximately 18,000 years ago, as Figure 1 shows.

Figure 1a in MBH98 (linked to in reference 5 above) shows the geographic location of the proxies - mostly tree rings - but with some coral sediments, bore hole and ice core data, with land based instrumental records from 1902.

It is worth considering though that we do have several high resolution proxy climate records from various regions around the world (think ice cores), and if abrupt global warming events happened in the past, then we might expect these local records to show them.....

Locations of proxy records with data back to AD 1000, 1500 and 1750 (instrumental: red thermometers; tree ring: brown triangles; borehole: black circles; ice core / ice borehole: blue stars; other including low - resolution records: purple squares) that have been used to reconstruct NH or SH temperatures by studies shown in Figure 6.10 (see Table 6.1, excluding O2005) or used to indicate SH regional temperatures (Figure 6.12).

The Vostok ice core proxy record shows that there has been substantial variability in temperature near the south pole throughout the Holocene.