Deglacial temperature history of West Antarctica.

摘要: The most recent glacial to interglacial transition constitutes a remarkable natural experiment for learning how Earth's climate responds various forcings, including rise in atmospheric CO2 This has left direct thermal remnant the polar ice sheets, where exceptional purity and continual accumulation of permit analyses not possible other settings. For Antarctica, deglacial warming previously been constrained only by water isotopic composition cores, without an absolute thermometric assessment isotopes' sensitivity temperature. To overcome this limitation, we measured temperatures deep borehole analyzed them together with ice-core data reconstruct surface temperature history West Antarctica. was [Formula: see text]C, approximately two three times global average, agreement theoretical expectations Antarctic amplification planetary changes. Consistent evidence from glacier retreat Southern Hemisphere mountain ranges, mostly completed 15 kyBP, several millennia earlier than Northern Hemisphere. These results constrain role variable oceanic heat transport between hemispheres during deglaciation quantitatively bound influence forcings on Although models perform well average context, some syntheses have underestimated lowest can be discounted.