Stable isotop record of sediments across MIS 5 and Termination II

New surface water records from two high sedimentation rate sites, located in the western subtropical North Atlantic near the axis of the Gulf Stream, provide clear evidence of suborbital climate variations through marine isotope stage (MIS) 5 persisting even into the warm peak of the interglaciation (substage 5e). We found that the amplitude of suborbital climate oscillations did not vary significantly for the whole of MIS 5, implying that ice volume has little or no influence on the amplitude of suborbital climate variability in this region. Although some records suggest that longer suborbital variations (4-10 kyr) during MIS 5 are linked to deepwater changes, none of the existing records is of sufficient resolution to assess if a linkage occurred for oscillations shorter than 4 kyr. However, when examined in conjunction with published data from the Norwegian Sea, new evidence from the subpolar North Atlantic suggests that coupled surface-deepwater oscillations occurred during the penultimate deglaciation. This supports the hypothesis that during glacial and deglacial times, ocean-ice interactions and deepwater variability amplify suborbital climate change at higher latitudes. We suggest that during the penultimate deglaciation the North Atlantic deepwater source varied between Nordic Sea and open North Atlantic locations, in parallel with surface temperature oscillations.

(Table 1) Age determination of DSDP Hole 94-607 and sediment cores V30-101 and V23-81

Oxygen isotope measurements in Greenland ice demonstrate that a series of rapid warm-cold oscillations -called Dansgaard-Oeschger events- punctuated the last glaciation (Dansgard et al., 1993, doi:10.1038/364218a0). Here we present records of sea surface temperature from North Atlantic sediments spanning the past 90 kyr which contain a series of rapid temperature oscillations closely matching those in the ice-core record, confirming predictions that the ocean must bear the imprint of the Dansgaard-Oeschger events (Broecker et al., 1988, doi:10.1016/0033-5894(88)90082-8; 1990, doi:10.1029/PA005i004p00469). Moreover, we show that between 20 and 80 kyr ago, the shifts in ocean-atmosphere temperature are bundled into cooling cycles, lasting on average 10 to 15 kyr, with asymmetrical saw-tooth shapes. Each cycle culminated in an enormous discharge of icebergs into the North Atlantic (a 'Hein-rich event' (Bond et al., 1992, doi:10.1038/360245a0; Broecker et al., 1992, doi:10.1007/BF00193540), followed by an abrupt shift to a warmer climate. These cycles document a previously unrecognized link between ice sheet behaviour and ocean-atmosphere temperature changes. An important question that remains to be resolved is whether the cycles are driven by external factors, such as orbital forcing, or by inter-nal ice-sheet dynamics.

Atlantic 231Pa/230Th and biogenic opal compilation of the Holocene and the LGM

The strength and geometry of the Atlantic meridional overturning circulation is tightly coupled to climate on glacial-interglacial and millennial timescales, but has proved difficult to reconstruct, particularly for the Last Glacial Maximum. Today, the return flow from the northern North Atlantic to lower latitudes associated with the Atlantic meridional overturning circulation reaches down to approximately 4,000 m. In contrast, during the Last Glacial Maximum this return flow is thought to have occurred primarily at shallower depths. Measurements of sedimentary 231Pa/230Th have been used to reconstruct the strength of circulation in the North Atlantic Ocean, but the effects of biogenic silica on 231Pa/230Th-based estimates remain controversial. Here we use measurements of 231Pa/230Th ratios and biogenic silica in Holocene-aged Atlantic sediments and simulations with a two-dimensional scavenging model to demonstrate that the geometry and strength of the Atlantic meridional overturning circulation are the primary controls of 231Pa/230Th ratios in modern Atlantic sediments. For the glacial maximum, a simulation of Atlantic overturning with a shallow, but vigorous circulation and bulk water transport at around 2,000 m depth best matched observed glacial Atlantic 231Pa/230Th values. We estimate that the transport of intermediate water during the Last Glacial Maximum was at least as strong as deep water transport today.

My scrapbook of medicine : a series of squibs in prose and verse, presented in popular medicine style, that are calculated to throw a few highlights on some of the personages and some of the events that have made medical history : with bibliography and index /

"Some of these squibs have appeared in the monthly 'Bulletin' which is the official organ of the Academy of medicine of Toledo and Lucas county. They ran under the caption 'Medical phflugg'." - Pref.

An experimental investigation of liquid distribution and surface character in horizontal annular two-phase flow. OOR Project no. 2117. Contract DA-30-115-ORD-992. Interim report no. 1

Mode of access: Internet.

Fifty years of a showman's life, or, The life and travels of Van Hare /

Source: Gift of John J. and Hanna M. McManus and Morris N. and Chesley V. Young, Oct. 12, 1955.

A first reader /

Mode of access: Internet.

The professor in Erin.

Mode of access: Internet.

1932 UM Track Team

Top Row: Francis Hazen, Robert Ostrander, Richard McManus, Arthur Northrup, Donald Haefele, John Humphrey, Jerry Rea, st. mngr. David Louis

Middle Row: Harold Ellerby, Konrad W. Moisio, William Lemen, Edwin Turner, Roderick Cox, William Hill, Roger Howell, Hawley Eggleston, David Fitzgibbons,

Front Row: Booker Brooks, Donald Renwick, John Campbell, Edwin Russell, Coach Charles Hoyt, Charles DeBaker, Ben Glading, Harmon Wolfe

1934 UM Track Team

Daniel Schwenger, Nelson Droulard, John Kauffman, David Hunt, Harmon Wendland, Richard McManus

3rd Row: st. mngr Charles Parvin, Ben Starr, Martin Alexander, E. Widmer Etchells, Melvin Silverman, Edward Stone, Clark Schell

2nd Row: Paul Gorman, Nere Alix, Roderick Howell, Willis Ward, Robert Kositchek, David Hunn, Anthony Serakos, Harvey Patton

Front Row: Albert Blumenfeld, Edward Lemen, captain Harold T. Ellerby, coach Charles Hoyt, Harvey Smith, Jack Childs, Robert Lamb

1931 Men's Cross country Team

Back Row: Robert Ostrander, William Hill, David Fitzgibbons, mngr. James Shelton

Front Row: Richard McManus, Robert Howell, Harmon Wolf, coach Charles Hoyt, Howard Braden

1932 Men's Cross country Team

Back Row: J.H. Clark, William Hill, Archie McMillan, mngr. Richard Norris

Roger Howell, coach Charles Hoyt, William Howell, R. H. Ostrander, Richard McManus

1869 University of Michigan Baseball Team

Standing: : Lester O. Goddard, Samuel Hayes, Albert Pattengill, Edmund Gale, Julius Blackburn

Front Row:Alfred Wilkinson, Robert McCart, William Crocker, captain Fred A. McManus