993 resultados para Whiting, Henry L.


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The observation that Greenland and Antarctic temperatures have followed a specific 'asymmetrical' pattern on millennial time-scales sets rigid constraints on any viable theory of abrupt climate change. The further observation that the very same asymmetry is also reflected in planktonic and benthic d18O measurements from the Northeast Atlantic has extended this constraint to include a specific response in the ocean. Here we present records of deep-water temperature, d18O and d13C variability from the Northeast Atlantic that help to shed light on the links between overturning circulation perturbations, sea-level variability and inter-hemispheric climate change on millennial time-scales. Results indicate that while deep-water temperatures in the Northeast Atlantic have tracked Greenland climate, the d18O signature of local deepwater (d18Odw) has varied in a manner more reminiscent of Antarctic temperature variability. The previously identified correspondence of Antarctic warm events with benthic d18O minima in the Northeast Atlantic is thus found to apply specifically to d18Odw minima, and to extend beyond Marine Isotope Stage 3 to the entirety of the last 50 ka. It is impossible to reconcile completely the Iberian Margin d18Odw record with existing reconstructions of millennial sea-level variability, leading to the conclusion that a significant portion of the d18Odw record must represent local hydrographic change. This is supported by benthic d13C measurements, which suggest the incursion during Greenland stadials of a colder, low-d18O and low-d13C water-mass, of presumed Antarctic origin. These observations confirm a one-to-one coupling of inter-hemispheric climate events with changes in the Atlantic overturning circulation, but fail to rule in or out a unique mechanism by which they were triggered.

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Mode of access: Internet.

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"Brief sketch of the author, by Henry L. Oak": p.[3]-4.

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Mode of access: Internet.

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Twenty-fifth report includes historical sketch of the museum, by Henry L. Ward, director (p. 25-40)

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For discussion of authorship and authors see Quarterly of the Oregon Historical Society, v. 4 (1903) p. 287-364.

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Mode of access: Internet.

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Colophon: London: Printed by William Clowes, Northumberland-court.

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A correspondence with H.L. Hopkins, Lieutenant-Governor of Virginia in 1839., and with J.W. Gilmer, Governor of Virginia in 1840, concerning the extradition of three colored men from New York State charged with stealing a negro slave in Virginia.

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(cont) The source of the Mississippi / by N.H. Winchell -- Prehistoric man at the headwaters of the Mississippi River / by J.V. Brower -- Charter members of the Minnesota Historical Society and its work in 1896 / by Alex. Ramsey -- History of agriculture in Minnesota / by James J. Hill -- History of mining and quarrying in Minnesota / by Warren Upham -- History of the discovery of the Mississippi River and the advent of commerce in Minnesota / Russell Blakeley -- Reminiscences of persons and events in the early days of the Minnesota Historical Society / by William H. Kelley -- Fort Snelling from its foundation to the present time / by Richard W. Johnson -- Sully's expedition against the Sioux, in 1864 / by David L. Kingsbury -- State-building in the West / by Charles E. Flandrau -- Obituaries.

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"Second edition."