Sentences with phrase «pleistocene glacial maxima»

During the late Pleistocene glacial maxima, about two - thirds of the present Alaskan land mass was ice free (Hamilton and Goebel 1999:156).

Not exact matches

During the Last Glacial Maximum in the Pleistocene Epoch, approximately 26,000 years ago, many areas and islands in Asia were connected.

The current secondary contact is thought to result from a range expansion associated with the amelioration of climatic conditions after the last glacial maximum (∼ 18000 ya)[20], although previous glacial / interglacial cycles during the Pleistocene may have provided multiple opportunities for vicariant and past hybridization events.

Without our use of fossil fuels, we should be descending into another glacial maximum — albeit slowly, over tens of thousands of years (the pace of natural global climate change in the Pleistocene).

Her glacial - interglacial range is a bit larger, for example the last glacial maximum (LGM, ~ 20 ky) is nearer -6 °C than -5 °C, and the temperatures prior to the «mid Pleistocene transition» (circa 1 My, some say 1.2 My) are rather different.

Tagged Arctic basin, genetic bottleneck, ice age, last glacial maximum, LGM, perennial ice, Pleistocene, polar bear, population bottleneck, population decline, ringed seal, sea ice, sea ice habitat, sea level, seasonal ice

While the polar bear is an Ice Age species, genetic and fossil evidence suggests it barely survived the profound sea ice changes associated with the Last Glacial Maximum, one of the most severe glacial periods of the PleisGlacial Maximum, one of the most severe glacial periods of the Pleisglacial periods of the Pleistocene.

Second, the abstract admits that, «Pleistocene climate oscillations yield a fast - feedback climate sensitivity of 3 ± 1 °C for a 4 W m − 2 CO2 forcing if Holocene warming relative to the Last Glacial Maximum (LGM) is used as calibration, but the error (uncertainty) is substantial and partly subjective» and also «Ice sheet response time is poorly defined».

Pleistocene climate oscillations yield a fast - feedback climate sensitivity of 3 ± 1 °C for a 4 W m − 2 CO2 forcing if Holocene warming relative to the Last Glacial Maximum (LGM) is used as calibration, but the error (uncertainty) is substantial and partly subjective because of poorly defined LGM global temperature and possible human influences in the Holocene.