Sentences with word «icesheet»

From analyzing air bubbles trapped in icesheets and glaciers, scientists know that global CO2 levels never exceeded 300 ppm during the 800,000 years before the Industrial Revolution.

Soon we will have begun an irreversible melting of the Greenland icesheet and if that happens that will have very significant effects on the climate, well pretty much indefinately.

Proxy records suggest that the WAIS [West Antarctic Ice Sheet] might have collapsed during past interglacials (Naish et al., 2009b; Vaughan et al., 2011) and was absent during warm periods of the Pliocene when CO2 concentration was 350 — 450 ppm... and global sea level was higher than present... These reconstructions and one icesheet model simulation (Pollard and DeConto, 2009) suggest that WAIS is very sensitive to the subsurface ocean temperature.

The Arctic icesheet is thinning and melting back.

And it has survived near total extinction events where only subterranean bacteria persisted, snowball earth where no ground was left exposed, only thick icesheets.

Radiative perturbation from icesheet and changed sealevel is estimated -3.2 W / m2 (with higher uncertainties than GHG), Vegatation and aerosols estimated -1 W / m2.

WRT our current discussion of ice sheet dynamics, the latest IPCC report actually has * less * to offer in terms of icesheet change predictions precisely because there have been so many new findings and such dramatic changes in just the last few years.

Debate at the state legislature in the final hours before passage included lawmakers asserting that the ongoing meltdown of global icecaps or of the icesheet on land masses like Greenland does not raise Atlantic sea levels.

Some theorize that the sub-glacial lakes under Antarctica's icesheet are melted because of being closer to the Earth's moltencore.