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Should Quaternary sea-level changes be used to correct glacier ELAS, vegetation belt altitudes and sea level temperatures for inferring climate changes?

Published online by Cambridge University Press:  20 January 2017

Henry A. Osmaston
Henry A. Osmaston*
Affiliation:
School of Geographical Sciences, University of Bristol, UK
*
*Thwaite End, Finsthwaite, Ulverston, Cumbria LA12 8BN, UK. Fax: +44 15395 31070.E-mail address:osmaston@clara.net
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Abstract

Changes in the altitudes of glacier snowlines (ELAs) and the altitudes of montane vegetation belts (VBAs) measure Quaternary climatic change. An accepted ‘correction’ to such changes by deducting the amount of contemporary sea level fall is wrong, since the air displaced by the ice sheets approximately fills the space left by the falling sea level and so there is no overall downward movement of the troposphere. This also causes a reduced cooling at the lowered sea level relative to that at the former inter-glacial sea level, about 1°C at the Las Glacial Maximum, which reduces the discrepancies previously noted by others between terrestrial and marine estimates of sea-level cooling. The change in temperature is indicated by the product of the ELA or VBA lowering and the environmental lapse rate (ELR). Prior estimates of ΔELA (−900 ± 135 m) and ELR (−6° ± 0.1°C km−1) would indicate a cooling of −5.4°C at interglacial sea level and −4.4°C at glacial sea level, although glacial-period ELRs are not known reliably. Established ELA corrections for local epeirogenic uplift or subsidence are appropriate.

Keywords

QuaternaryClimate changeGlacierEquilibrium-line altitudeSea levelEnvironmental lapse rateVegetation beltCorrection
Type
Original Articles
Information
Quaternary Research , Volume 65 , Issue 02 , March 2006 , pp. 244 - 251
Copyright
University of Washington

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References

Betts, A.K., Ridgway, W., (1992). Tropical boundary layer equilibrium in the last ice age. Journal of Geophysical Research 97, 2529–2534.CrossRefGoogle Scholar
Broecker, W.S.,(1995). The glacial world according to Wally.. Lamont Doherty Earth Observation Lab., Columbia University (mimeo, 324 pp).Google Scholar
Broecker, W.S., (1997). Mountain glaciers: recorders of atmospheric water vapor content?. Global Biogeochemical Cycles 11, 589–597.CrossRefGoogle Scholar
Clapperton, C.M., (1991). Influence of tectonics on the extent of Quaternary glaciation in the Andes. Boletin 8, 89–108.(IG-USP)Google Scholar
Clark, P.U., Mix, A.C., (2002). Ice sheets and sea level of the Last Glacial maximum. Quaternary Science Reviews 21, 1–7.CrossRefGoogle Scholar
CLIMAP Project Members, (1976). The surface of the Ice-Age Earth CLIMAP Project Members. Science 191, 1131–1137.Google Scholar
Gillespie, A., Molnar, P., (1995). Asynchronous maximum advances of mountain and continental glaciers. Reviews of Geophysics 33, 3 311–364.CrossRefGoogle Scholar
Greene, A.M., Seager, R., Broecker, W.C., (2002). Tropical snowline depression at the Last Glacial maximum: comparison with proxy records using a single-cell tropical climate model.. Journal of Geophysical Research 107, D8, 10, 1029–2001.Google Scholar
Milne, G.A., Mitrovica, J.X., Schrag, D.P., (2002). Estimating past continental ice volume from sea level data. Quaternary Science Reviews 21, 176–361.CrossRefGoogle Scholar
Porter, S.C., (1979). Hawaiian glacial ages. Quaternary Research 12, 161–187.CrossRefGoogle Scholar
Porter, S.C., (2001). Snowline depression in the tropics during the last glaciation. Quaternary Science Reviews 20, 1067–1091.CrossRefGoogle Scholar
Porter, S.C., (2005). Pleistocene snowlines and glaciation of the Hawaiian Islands.. Quaternary International 138–139, 118–128.Google Scholar
Richards, B., Benn, D.I., Owen, L.A., Rhodes, E.J., Spencer, J.Q., (2000). Timing of late Quaternary glaciations south of Mount Everest in the Khumbu Himal, Nepal. Geological Society of America Bulletin 122, 1621–1632.2.0.CO;2>CrossRefGoogle Scholar
Rind, D., Peteet, D., (1985). Terrestrial conditions at the last glacial maximum and CLIMAP sea surface temperature estimates: are they consistent?. Quaternary Research 24, 1–22.CrossRefGoogle Scholar
Webster, P.J., van Streten, N.A., (1978). Late Quaternary Ice Age climates of tropical Australasia: interpretations and reconstructions. Quaternary Research 10, 279–309.CrossRefGoogle Scholar