Sentences with phrase «pleistocene glacial cycles»

Lindzen was only able to keep the «iris» ball in the air for as long as he did because prior to the advent of AIRS the upper troposphere was an especially hard place to get accurate measurements, and by completely ignoring paleoclimate, e.g. the conflict between the «iris» and the Pleistocene glacial cycles, and the fact that prior to the Pleistocene higher CO2 levels led to temperatures that kept glaciers from existing at all (the latter having been firmed up only recently, to be fair).

But a major problem exists for the standard orbital hypothesis of glaciation: Late Pliocene and early Pleistocene glacial cycles occur at intervals of 40 ky (8 — 11), matching the obliquity period, but have negligible 20 - ky variability.

And if you argue that all modern species are adapted to Pleistocene glacial cycles, then logically, to stop the cycles will also be to upset the supposed plans of Nature.

Not exact matches

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.

Walt, if you've ever studied Pleistocene geology and the million year history of glacial advances and interglacial warming cycles you would know human - induced global warming and climate changes are the dominant cause of current and future catastrophic consequences.

Second, sub-stage 19c lies near the middle - Pleistocene, a time when the climate system appears to have been most clearly transitioning from smaller amplitude, shorter period, and more symmetric glacial cycles, to the larger, longer, and more saw - toothed glacial cycles of the late Pleistocene.

And in fact this is the mechanism by which a CO2 feedback amplified the temperature swings during the Pleistocene glacial / interglacial cycles.

The northern polar ice - cap has oscillated in size over the last 2 million years (the glacial - interglacial cycles of the Pleistocene Epoch).