Glacial Inception in Marine Isotope Stage 19: An Orbital Analog for a Natural Holocene Climate.

ABSTRACT: The Marine Isotope Stage 19c (MIS19c) interglaciation is regarded as the best orbital analog to the Holocene. The close of MIS19c (~777,000 years ago) thus serves as a proxy for a contemporary climate system unaffected by humans. Our global climate model simulation driven by orbital parameters and observed greenhouse gas concentrations at the end of MIS19c is 1.3 K colder than the reference pre-industrial climate of the late Holocene (year 1850). Much stronger cooling occurs in the Arctic, where sea ice and year-round snow cover expand considerably. Inferred regions of glaciation develop across northeastern Siberia, northwestern North America, and the Canadian Archipelago. These locations are consistent with evidence from past glacial inceptions and are favored by atmospheric circulation c

SUBMITTER: Vavrus SJ 

PROVIDER: S-EPMC6033942 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature