Sentences with phrase «kyr before»

Carbon dioxide measurements on Dome C ice, focusing on the interval 390 to 650 kyr before present, bp (2,700 — 3,060 m) 4, confirmed the strong coupling between CO2 and Antarctic temperature found1 in the Vostok ice core for the past 420 kyr.

Ice core records are rich archives of the climate history during glacial - interglacial cycles over timescales of up to ~ 800 kyr before the current age.

Not exact matches

The abstract of the paper in Nature reads: «A key event in human evolution is the expansion of modern humans of African origin across Eurasia between 60 and 40 thousand years (kyr) before present (bp), replacing all other forms of hominins1.

The first column is time before present in kyrs, the second, Earth orbit semi-major axis.

[Response CO2 levels are currently higher than for any time when we have direct measurements (directly, from 1950; before that, from air trapped in ice cores), which amounts to the last 780,000 years (see, e.g., a picture here for the last 400 kyr).

Similar to MIS 5 and 9, CO2 drops by about 15 p.p.m.v. in MIS 19 to a slowly decreasing phase of about 10 kyr, before it declines in a sawtooth pattern to glacial levels.

During this period, CO2 falls to its lowest value ever found in ice cores, 172 p.p.m.v. (667 kyr bp), redefining the natural range of CO2 of the late Quaternary to about 170 to 300 p.p.m.v., before it rises at a rate of 8 p.p.m.v. kyr — 1 to 190 p.p.m.v. at 665 kyr bp.

To illustrate this difference in the CO2 / temperature relationship before and after MIS 16, we calculate mean values for four different time intervals (799 — 650, 650 — 450, 450 — 270 and 270 — 50 kyr bp).

Yes you have posted that before, and the comment I made was the Aegean sea and Craig cave show warm spikes centered at 8.2 kyr BP, and more importantly, intensified trade winds, which is the wrong sign to associate with a cold period.

All dipole moment reconstructions show the well - established pattern of higher values during the recent 3 kyrs and lower values before.