Climatic forcing before, during, and after the 8.2 Kyr B.P. global cooling event
- 554 Downloads
This paper attempts at full characterization of the unique global 8.2 Kyr B.P. cooling event. Significant atmospheric cooling started during 9.5–8.5 Kyr B.P. when the Sun was extremely quiet during three periods of ∼ 50–100 years. The flood of melt water in the N. Atlantic from glacial lakes during the demise of the Laurentide ice sheet, starting at ∼ 8.5 Kyr B.P., adds to the atmospheric cooling. Climatic forcing events occurred at 8.5 Kyr B.P., at 8.2 Kyr B.P. and finally at 8.06 Kyr B.P., leading to concurrent increases or decreases in the atmospheric Δ14C levels, completely consistent with the climatic forcing proposed here.
Keywords8.2 Kyr cooling event paleoclimate atmospheric 14C atmospheric δ18O enhanced oceanic mixing cosmogenic 14C in ice atmospheric sciences climate modeling
Unable to display preview. Download preview PDF.
- Alley R B, Shuman C A, Meese D A, Gow A J, Taylor K C, Cuffey K M, Fitzpatrick J J, Grootes P M, Zielinski G A, Ram M, Spinelli G and Elder B 1997 Visual-stratigraphic dating of the GISP2 ice core: Basis, reproducibility, and application; J. Geophys. Res. — Oceans 102 26,367–26,381.Google Scholar
- Berger W H and Killingley J S 1982 The Worthington effect and the origin of the Younger Dryas; J. Marine Res. 40 27–38.Google Scholar
- Cuffey K M and Clow G D 1997 Temperature, accumulation, and ice sheet elevation in central Greenland through the last deglacial transition; J. Geophys. Res. — Oceans 102 26,383–26,396.Google Scholar
- Key R M, Kozyr A, Sabine C L, Lee K, Wanninkhof R, Bullister J L, Feely R A, Millero F J, Mordy C and Peng T-H 2004 A global ocean carbon climatology: Results from global data analysis project (GLODAP); Global Biogeochem. Cycles 18 doi:10.1029/2004GB002247.Google Scholar
- Morrill C and Jacobsen R M 2005 How widespread were climate anomalies 8200 years ago?; Geophys. Res. Lett. 32 doi:10.1029/2005GL023536.Google Scholar
- Pang K D and Yau K K 2002 Ancient observations link changes in Sun’s brightness and earth’s climate; Eos. Am. Geophys. Union. 83 489–490.Google Scholar
- Rasmussen S O et al 2006 A new Greenland ice chronology for the last glacial termination; J. Geophys. Res. 111 doi:10.1029/2005JD006079.Google Scholar
- Stuiver M, Reimer P J, Bard E, Beck J W, Burr G S, Hughen K A, Kromer B, McCormac G, Plight J V D and Spurk M 1998 INTCAL98 radiocarbon age calibration, 24,000-0 cal BP; Radiocarbon 40 1041–1083.Google Scholar
- Summerhayes C P, Emeis K-C, Angel M V, Smith R L and Zeitzschel B 1995 Upwelling in the ocean; Report of Dahlem Workshop Sept. 25–30, 1994, Berlin (John Wiley and Sons) 422.Google Scholar
- Worthington L V 1968 Genesis and evolution of water masses; Meteorological Monographs 8 63–67.Google Scholar