- Email: [email protected]
Climatic variability and deep ocean circulation: evidence from the North Atlantic
OLR (1983) 30 (6)
D. Submarine Geology and Geophysics
83:3341 Oerlemans, J., 1982. Glacial cycles and ice-sheet modelling. Clim. Change, 4(4):353-374. The author's (1981) numerical model of a Northern Hemisphere ice sheet, employing vertically-integrated ice flow along a meridian, is modified by consideration of the internal temperature field and the effects of basal sliding accompanying basal melting. The model predicts cyclic glaciation, asymmetrically rapid deglaciation, and cycles lasting 100,000 years (using appropriate parameters). It is concluded that ice sheet dynamics ultimately may explain the cyclical Pleistocene glaciations. Inst. for Meteoroi. and Oceanogr., Univ. of Utrecht, Princetonplein 5, Utrecht, Netherlands. (hbf) 83:3342 Parrish, J.T., A.M. Ziegler and C.R. Scotese, 1982. Rainfall patterns and the distribution of coals and evaporites in the Mesozoic and Cenozoic. Palaeogeogr. Palaeoclimatol. Palaeoecol., 40(1/3):67101. Includes 7 pages of references. USGS, Denver Federal Center, P.O. Box 25046, Denver, Colo. 80225, USA. 83:3343 Pigram, C.J., A.B. Challinor, F. Hasibuan, E. Rusmana and U. Hartono, 1982. Lithostratigraphy of the Misool Archipelago, Irian Jaya, Indonesia. Geologie M~nb., 61(3):265-279. A lithostratigraphic column and geologic map are presented. Only Early Triassic, Early Jurassic, and Late Oligocene gaps interrupt the nearly complete, highly fossiliferous marine Mesozoic-Cenozoic sequence exposed on the archipelago. Part of the rift-drift sequence which formed during northern Gondwana break-up, the Misool stratigraphy 'provides precise timing for these events.' Bur. of Min. Res., Geol. and Geophys., Australia, c/-Jalan, Cilaki 49, Bandung, Indonesia. (hbf) 83:3344 Saltzman, E.S. and E.J. Barron, 1982. Deep circulation in the Late Cretaceous: oxygen isotope paleotemperatures from lnocemmns remains in DSDP cores. Palaeogeogr. Palaeoclimatol. Palaeoecol., 40(1/3): 167-181. Because there are too few suitable specimens of Foraminifera to reconstruct Cretaceous oceanography, shells of Inoceramus, an extinct epibenthic bivalve, from DSDP Legs 1-69 and 75 were used for C and O isotopic analyses. Late Cretaceous ocean temperatures (5-16°C) were significantly warmer than today's, and 'deep water was formed both by cooling at high latitudes and by evaporation in the
453
subtropics.' Div. of Mar. Geol. and Geophys., RSMAS, 4600 Rickenbacker Causeway, Miami, Fla. 33149, USA. (mwf) 83:3345 Salvigsen, Otto and Henrik Osterholm, 1982. Radiocarbon dated raised beaches and glacial history of the northern coast of Spitsbergen, Svalbard. Polar Res., 1:97-115. 83:3346 Sarnthein, Michael, Helmut Erlenkeuser and Rainer Zahn, 1982. Termination I: the response of continental climate in the subtropics as recorded in deep-sea sediments. Bull. Inst. G~ol. Bassin Aquitaine, 31/32:393-407. Termination I lasted from 16,000-8,500 yrBP with 2 interruptions. The northwest Australian winds decreased in strength ~16,000 yrBP; Northern Hemisphere meridional trade winds responded to deglaciation much later. Fluvial runoff began ~13,500 yrBP along the southern Sahara margin. Harmattan dust outbreaks to the Atlantic and the trade winds ~12,000 yrBP were at the same latitudes as at present, supporting the hypothesis that the ITCZ did not shift poleward during Termination I. Geol.Palaont. Inst., Univ., Olshausenstr. 40-60, D-2300 Kiel, FRG. (msg) 83:3347 Schnitker, Detmar, 1982. Climatic variability and deep ocean circulation: evidence from the North Atlantic. Palaeogeogr. Palaeoclimatol. Palaeoecol., 40(1/3):213-234. Fluctuations in deep-sea benthic Foraminifera may record global climatic fluctuations that are stochastic in origin. A hypothetical feedback loop shows that changes in bottom water characteristics triggered in the northern North Atlantic would be propagated through the oceans to upwelling regions of the North Pacific. There, SST would influence the jet stream, providing 'an atmospheric teleconnection from the North Pacific to North America'; this effect, in turn, would modulate North Atlantic downwelling. Dept. of Geol. Sci., Univ. of Maine, Orono, Maine 04469, USA. (mwO 83:3348 Shackleton, N.J., 1982. The deep-sea sediment record of climate variability. Prog. Oceanogr., 11(2): 199-218.
An analysis of new climatic data with orderof-magnitude improvements in resolution suggests that Mitchell's (1976) hypothesis that global climate should be studied with a resolution better than either
D. Submarine Geology and Geophysics
83:3341 Oerlemans, J., 1982. Glacial cycles and ice-sheet modelling. Clim. Change, 4(4):353-374. The author's (1981) numerical model of a Northern Hemisphere ice sheet, employing vertically-integrated ice flow along a meridian, is modified by consideration of the internal temperature field and the effects of basal sliding accompanying basal melting. The model predicts cyclic glaciation, asymmetrically rapid deglaciation, and cycles lasting 100,000 years (using appropriate parameters). It is concluded that ice sheet dynamics ultimately may explain the cyclical Pleistocene glaciations. Inst. for Meteoroi. and Oceanogr., Univ. of Utrecht, Princetonplein 5, Utrecht, Netherlands. (hbf) 83:3342 Parrish, J.T., A.M. Ziegler and C.R. Scotese, 1982. Rainfall patterns and the distribution of coals and evaporites in the Mesozoic and Cenozoic. Palaeogeogr. Palaeoclimatol. Palaeoecol., 40(1/3):67101. Includes 7 pages of references. USGS, Denver Federal Center, P.O. Box 25046, Denver, Colo. 80225, USA. 83:3343 Pigram, C.J., A.B. Challinor, F. Hasibuan, E. Rusmana and U. Hartono, 1982. Lithostratigraphy of the Misool Archipelago, Irian Jaya, Indonesia. Geologie M~nb., 61(3):265-279. A lithostratigraphic column and geologic map are presented. Only Early Triassic, Early Jurassic, and Late Oligocene gaps interrupt the nearly complete, highly fossiliferous marine Mesozoic-Cenozoic sequence exposed on the archipelago. Part of the rift-drift sequence which formed during northern Gondwana break-up, the Misool stratigraphy 'provides precise timing for these events.' Bur. of Min. Res., Geol. and Geophys., Australia, c/-Jalan, Cilaki 49, Bandung, Indonesia. (hbf) 83:3344 Saltzman, E.S. and E.J. Barron, 1982. Deep circulation in the Late Cretaceous: oxygen isotope paleotemperatures from lnocemmns remains in DSDP cores. Palaeogeogr. Palaeoclimatol. Palaeoecol., 40(1/3): 167-181. Because there are too few suitable specimens of Foraminifera to reconstruct Cretaceous oceanography, shells of Inoceramus, an extinct epibenthic bivalve, from DSDP Legs 1-69 and 75 were used for C and O isotopic analyses. Late Cretaceous ocean temperatures (5-16°C) were significantly warmer than today's, and 'deep water was formed both by cooling at high latitudes and by evaporation in the
453
subtropics.' Div. of Mar. Geol. and Geophys., RSMAS, 4600 Rickenbacker Causeway, Miami, Fla. 33149, USA. (mwf) 83:3345 Salvigsen, Otto and Henrik Osterholm, 1982. Radiocarbon dated raised beaches and glacial history of the northern coast of Spitsbergen, Svalbard. Polar Res., 1:97-115. 83:3346 Sarnthein, Michael, Helmut Erlenkeuser and Rainer Zahn, 1982. Termination I: the response of continental climate in the subtropics as recorded in deep-sea sediments. Bull. Inst. G~ol. Bassin Aquitaine, 31/32:393-407. Termination I lasted from 16,000-8,500 yrBP with 2 interruptions. The northwest Australian winds decreased in strength ~16,000 yrBP; Northern Hemisphere meridional trade winds responded to deglaciation much later. Fluvial runoff began ~13,500 yrBP along the southern Sahara margin. Harmattan dust outbreaks to the Atlantic and the trade winds ~12,000 yrBP were at the same latitudes as at present, supporting the hypothesis that the ITCZ did not shift poleward during Termination I. Geol.Palaont. Inst., Univ., Olshausenstr. 40-60, D-2300 Kiel, FRG. (msg) 83:3347 Schnitker, Detmar, 1982. Climatic variability and deep ocean circulation: evidence from the North Atlantic. Palaeogeogr. Palaeoclimatol. Palaeoecol., 40(1/3):213-234. Fluctuations in deep-sea benthic Foraminifera may record global climatic fluctuations that are stochastic in origin. A hypothetical feedback loop shows that changes in bottom water characteristics triggered in the northern North Atlantic would be propagated through the oceans to upwelling regions of the North Pacific. There, SST would influence the jet stream, providing 'an atmospheric teleconnection from the North Pacific to North America'; this effect, in turn, would modulate North Atlantic downwelling. Dept. of Geol. Sci., Univ. of Maine, Orono, Maine 04469, USA. (mwO 83:3348 Shackleton, N.J., 1982. The deep-sea sediment record of climate variability. Prog. Oceanogr., 11(2): 199-218.
An analysis of new climatic data with orderof-magnitude improvements in resolution suggests that Mitchell's (1976) hypothesis that global climate should be studied with a resolution better than either