Sentences with phrase «kyrs from»

Averages over 3, 7 and 10 kyrs from the CALSxk models (Figs. 2b — 2d) suggest that, although there are zonal differences of minimum field intensity, the southern Atlantic is no preferred location for the minimum field strength.

And what if the final drainage event of Lake Agassiz was actually at 8.4 kyr BP (or 8.475 kyr from some sources), where GISP2 has a warm spike?

Not exact matches

The ages between the matching points in the cores were within 2 kyr, except during the last interglacial period referred to as «Marine Isotope Stage (MIS) 5,» which occurred from 80 - 130 kya.

The causes of the age differences at MIS 5 were proposed to occur from (i) an overestimation of the surface mass balance at around MIS 5d - 6 in the glaciological model, and (ii) an error in one of the age constraints by ~ 3 kyr at MIS 5b.

See Page 4 - 22, Figure 9: Geomagnetic field intensity level derived from composite volcanic records, not sea floor sediments, for the past 45 kyr.

East African hominin diversity at each 100 kyrs interval were estimated using first (FAD) and last appearance dates (FAD) from the literature [2], [35]--[36], [46].

The emerging timeline is as follows (Unit II): (1) a gradual rise of the chemocline over a period of ∼ 2 kyr following the onset of anoxia at ca. 7.6 kyr B.P., (2) fully developed euxinic conditions with an ascent of the chemocline onto the shelf at ca. 5.3 kyr B.P., (3) a subsequent descent of the chemocline, and (Unit I)(4) establishment of the chemocline in its present - day position at the shelf break from 2.7 kyr B.P. onward.

Strong variations in the geochemical and paleo - ecological composition and genetic signature of the sediments in the Black Sea provide testimony that the conditions in the water column have been far from constant over the past ∼ 7.5 kyr.

[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).

Indermühle, A., Monnin, E., Stauffer, B., Stocker, T. F. & Wahlen, M. Atmospheric CO2 concentration from 60 to 20 kyr bp from the Taylor Dome ice core, Antarctica.

Figure 2 shows our data together with earlier results from the Dome C (650 — 390 kyr bp4 and 22 — 0 kyr bp5), Vostok1, 2,3 (440 — 0 kyr bp) and Taylor Dome6 (60 — 20 kyr bp) ice cores resulting in a composite CO2 record over eight glacial cycles.

This implies that there could be a long - term CO2 increase by about 25 p.p.m.v. from 800 to 400 kyr bp.

This issue, known as the 100 - kyr problem, is compounded by a lack of explanation for the transition of the length of the cycles from 41,000 to 100,000 years at the mid-Pleistocene transition 1.2 million years ago.

From an article on Taylor Dome ice cores, «The data set consists of depth (m), ice age (kyr BP 1950)...»

Seafloor eruption rates, and mantle melting fueling eruptions, may be influenced by sea - level and crustal loading cycles at scales from fortnightly to 100 kyr.

E8 (8,300 BP) coincided with the outbreak of Lake Agassiz, and researchers are trying to differentiate the relative climatic contribution to the 8.2 kyr event from the solar minimum and the proglacial lake outbreak (Rohling & Pälike, 2005).

We have just started a sixth period with the proposed name of Anthropocene, that should last around 2,200 years, until about 4,200 C.E. Every one of the last five periods (since 10.2 kyr ago) started with global warming as a recovery from the depressed temperatures of the cooling oscillations that separate the periods.

Fig 5 in my last link is from Moy et al, and shows much weaker El Nino around 8.2 kyr BP.

They compared this synthetic VADM curve to the western Eurasia VADM curve by Genevey et al. (2008) and conclude from the mutual consistency but differing amplitudes that also the Knudsen et al. (2008) VADM reconstruction is probably influenced by geographically biased data towards western Eurasia during the recent 4 kyrs.

These climate oscillations have dominant periodicities, ranging from about 20 to 400 kyr, that coincide with variations in the Earth's orbital elements [26], specifically the tilt of the Earth's spin axis, the eccentricity of the orbit and the time of year when the Earth is closest to the Sun.

While Genevey et al. (2008) conclude that regional weighting can improve VADM results from the presently available data for the past 3 kyrs and acknowledge that, due to the lack of southern hemisphere data, VADM results might be geographically biased towards western Eurasia, Knudsen et al. (2008) consider the differences they find over the last 10 kyrs insignificantly small.

The LR04 age model establishes that MIS 11 spans two precession cycles, with 18O values below 3.6 o / oo for 20 kyr, from 398 - 418 ka.

Although ice volume and deep ocean temperature changes contributed comparable amounts to δ18O change on average over the full range from 35 Myr to 20 kyr BP, the temperature change portion of the δ18O change must decrease as the deep ocean temperature approaches the freezing point [43].

Figure 3: The phasing of CO2 concentration and temperature for the global (grey), Northern Hemisphere (NH; blue) and Southern Hemisphere (SH; red) proxy stacks based on lag correlations from 20 — 10 kyr ago in 1,000 Monte Carlo simulations.

«Lag correlations from 20 — 10 kyr ago suggest that the modelled global temperature lags CO2 concentration by 120 yr, which is within the uncertainty range of the proxy - based lag.»

We present here a high - resolution record of 10Be in the EPICA Dome C (EDC) ice core from Antarctica during the Marine Interglacial Stage 9.3 (MIS 9.3), 325 — 336 kyr ago, and investigate its spectral properties.

The NGRIP core from Greenland stretchs back more than 100 kyr, with 5 kyr in the Eemian interglacial.

A. Rates of temperature rise from the mid-19th century are higher than those of the glacial termination (17 — 10 kyr) by more than a factor of 10, increasing to a factor of 20 and higher from the mid-1970s.