Sentences with phrase «from palaeoclimate»

the figures in the above were based on: «Deriving global climate sensitivity from palaeoclimate reconstructions» Hoffert and Covey, Nature Vol 360, 10th December 1992.

Evidence from palaeoclimate records suggests that this circulation has changed dramatically in the past, and there is concern that it could be disrupted in the future.

In models run with the GISS forcing data, the «natural + anthropogenic» temperature evolution matches observations very well for a climate sensitivity of 0.75 °C / W / m ², which agrees with the value derived from palaeoclimate data.

Not exact matches

«The discrepancy could arise, of course, from the opposite problem: that the palaeoclimate proxy data are underestimating hydroclimatic extremes.

Ecological tree line history and palaeoclimate — review of megafossil evidence from the Swedish Scandes Leif Kullman Article first published online: 2 JAN 2013

Accounting for this results in recent historical estimates for TCR and ECS that are more consistent with constraints based on palaeoclimate data and process - based constraints from modern climatology.

Possible implications of the results for sensitivities derived from GCMs and palaeoclimate data are suggested.

Quoting from a paper that was accepted: «Many palaeoclimate records from the North Atlantic region show a pattern of rapid climate oscillations, the so - called Dansgaard — Oeschger events, with a quasi-periodicity of ∼ 1,470 years for the late glacial period» http://www.nature.com/articles/nature04121

The results have implications for how we interpret the impact of global warming on the hydrological cycle and its extremes, and may help to explain why palaeoclimate drought reconstructions based on tree - ring data diverge from the PDSI - based drought record in recent years9, 10.

Smith, A., Wynn, P., Barker, P., Leng, M., Noble, S., & Stott, A. (2016) Cave monitoring and the potential for palaeoclimate reconstruction from Cueva de Asiul, Cantabria (N. Spain).

DOI: 10.5038 / 1827 - 806X.45.1.1928 Cave monitoring and the potential for palaeoclimate reconstruction from Cueva de Asiul, Cantabria (N. Spain)

The evidence from surface temperature observations is strong: The observed warming is highly significant relative to estimates of internal climate variability which, while obtained from models, are consistent with estimates obtained from both instrumental data and palaeoclimate reconstructions.

Both terrestrial and marine palaeoclimate proxies (Thompson, 1991; Dowsett et al., 1996; Thompson and Fleming, 1996) show that high latitudes were significantly warmer, but that tropical SSTs and surface air temperatures were little different from the present.

Hansen and his colleagues summarise the challenge as follows: «If humanity wishes to preserve a planet similar to that on which civilisation developed and to which life on earth is adapted, palaeoclimate evidence and ongoing climate change suggest that CO2 will need to be reduced from its current 385ppm [parts per million] to at most 350ppm.»

In using AOGCM output in this way, it is important not only to demonstrate that these unforced simulations do not drift significantly (Osborn, 1996), but also to evaluate the extent to which model estimates of low - frequency variability are comparable to those estimated from measured climates (Osborn et al., 2000) or reconstructed palaeoclimates (Jones et al., 1998).

He is interested in palaeoclimate proxies, biotic evolution and stratigraphy, with particular emphasis on the fossil record of planktonic foraminifera from deep sea cores.