Stable carbon and nitrogen isotope composition of organic matter in sediments of the Oman Margin

Stable isotopic compositions of carbon and nitrogen and organic carbon content of sediments ranging from the Pliocene to the Pleistocene-Holocene in age from the Oman Margin (ODP Sites 724 and 725) are reported. In general, the organic carbon content is greater than 2% at Site 724. Prior to the Pleistocene-Holocene at this site, sediments with higher content of organic matter were deposited owing to favorable preservation conditions and/or higher productivity. In the Pleistocene, lower amounts of organic matter have been preserved; this material generally has more enriched nitrogen isotopic compositions. This may indicate intensification of the Oxygen Minimum Zone and denitrification with the onset of the Pleistocene. A correlation of carbon isotope content of these sediments with oxygen isotope stages at Site 724 indicates an enrichment in 13C during glacial events. Based on the stable isotope evidence of both carbon and nitrogen, there does not appear to be major input of terrigenous-derived allochthonous material in this marine environment. The timing and extent of monsoon winds on the productivity of this region are not evident, but require further studies for collaborative interpretation of small-scale features in the isotopic and carbon content of this environment.

Age determination and stable isotope composition of sediment cores from the Arctic Ocean

On the basis of 52 sediment cores, analyzed and dated at high resolution, the paleoceanography and climate of the Last Glacial Maximum (LGM) were reconstructed in detail for the Fram Strait and the eastern and central Arctic Ocean. Sediment composition and stable isotope data suggest three distinct paleoenvironments: (1) a productive region in the eastern to central Fram Strait and along the northern Barents Sea continental margin characterized by Atlantic Water advection, frequent open water conditions, and occasional local meltwater supply and iceberg calving from the Barents Sea Ice Sheet; (2) an intermediate region in the southwestern Eurasian Basin (up to 84-85°N) and the western Fram Strait characterized by subsurface Atlantic Water advection and recirculation, a moderately high planktic productivity, and a perennial ice cover that breaks up only occasionally; and (3) a central Arctic region (north of 85°N in the Eurasian Basin) characterized by a low-salinity surface water layer and a thick ice cover that strongly reduces bioproduction and bulk sedimentation rates. Although the total inflow of Atlantic Water into the Arctic Ocean may have been reduced during the LGM, its impact on ice coverage and halocline structure in the Fram Strait and southwestern Eurasian Basin was strong.

Geographic distribution of dinoflagellate cysts in surface sediments

Dinoflagellate cysts are useful for reconstructing upper water conditions. For adequate reconstructions detailed information is required about the relationship between modern day environmental conditions and the geographic distribution of cysts in sediments. This Atlas summarises the modern global distribution of 71 organicwalled dinoflagellate cyst species. The synthesis is based on the integration of literature sources together with data of 2405 globally distributed surface sediment samples that have been preparedwith a comparable methodology and taxonomy. The distribution patterns of individual cyst species are being comparedwith environmental factors that are knownto influence dinoflagellate growth, gamete production, encystment, excystment and preservation of their organic-walled cysts: surface water temperature, salinity, nitrate, phosphate, chlorophyll-a concentrations and bottom water oxygen concentrations. Graphs are provided for every species depicting the relationship between seasonal and annual variations of these parameters and the relative abundance of the species. Results have been compared with previously published records; an overview of the ecological significance as well as information about the seasonal production of each individual species is presented. The relationship between the cyst distribution and variation in the aforementioned environmental parameters was analysed by performing a canonical correspondence analysis. All tested variables showed a positive relationship on the 99% confidence level. Sea-surface temperature represents the parameter corresponding to the largest amount of variance within the dataset (40%) followed by nitrate, salinity, phosphate and bottom-water oxygen concentration, which correspond to 34%, 33%, 25% and 24% of the variance, respectively. Characterisations of selected environments as well as a discussion about how these factors could have influenced the final cyst yield in sediments are included.

Dinoflagellate cyst accumulation rates of ODP Hole 146-893A from Santa Barbara Basin

The dinoflagellate cyst record from Ocean Drilling Program Hole 893A, Santa Barbara Basin, southern California, is examined at millennial-scale resolution for the past 40 kyr. Changes in cyst abundance, composition of cyst assemblages, and their diversity reflect major shifts in climate and ocean circulation in the region over this time interval. Throughout the sequence, dinoflagellate cyst assemblages are dominated by heterotrophic dinoflagellates. Brigantedinium spp. and other upwelling-related taxa such as Echinidinium and Protoperidinium americanum are abundant, indicating the continued influence of coastal upwelling on the basin during the late Quaternary. A significant increase in cyst accumulation rates is seen during the Holocene and, to a lesser extent, during shorter warming events such as Bolling/Allerod and Dansgaard-Oeschger interstadials, implying enhanced marine productivity during these periods. Cyst diversity is high during the Holocene. An increase in abundance of cysts produced by autotrophic dinoflagellates in the late Holocene suggests enhanced input of warm, nutrient-rich waters. In contrast, cyst assemblages from the Last Glacial Maximum exhibit a relatively low diversity and an increase in the cysts of heterotrophic dinoflagellates, in particular Selenopemphix nephroides. The presence of this taxon in association with Brigantedinium spp. implies substantial cooling of surface waters in the Santa Barbara Basin at that time.

Calibration of a 90 V̊-notch weir using parameters other than upstream head /

Mode of access: Internet.

A model for the identification of high risk occupational groups using RTECS and NOHS data /

Accompanying microfiches (issued in pocket inside back cover) have title: NIOSH risk identification model.

Mississippi's counties; some social & economic aspects.

Mode of access: Internet.

National occupational exposure survey : field guidelines /

"March 1988."

The man a woman marries; problems in consideration

"This volume ... is the companion or counterpart of my first book: The woman a man marries."--Pref.

Hoenderteelt; uitvoerige handleiding. Uit het Deensch vertaald

Mode of access: Internet.

Praktische hoenderteelt. Uit het Deensch vertaald

Mode of access: Internet.

De Salute Regis Salomonis ... /

Hand-numbered leaves, 53-84.

The woman a man marries /

Mode of access: Internet.

H. C. Andersen's sämmtliche Märchen.

Mode of access: Internet.

University of Michigan Football Team, 1950

Top Row: Bob Dingman, Russ Rescorla, Ben Pedersen, Leslie Popp, Dick McWilliams, Don Rahrig, Mark Scarr, Tom Johnson, John Hess, Peter Kinyon, Leo Koceski, Don Peterson, Tom Witherspoon, Gene Hinton, Fred Pickard, Don Dugger, Bob Littleson, Bruce Bartholomew, Dick Strozewski, Bill Putich, James Skala, Merritt Green, Dick Farrer, Don Oldham.

3RD Row: David Stinson, Lowell Perry, Frank Howell, Norman Jackson, Coaches Bill Orwig, George Ceithaml, J. T. White, Bennie Oosterbaan, Jack Blott, Cliff Keen, Ernie McCoy, Don Robinson, Dave Hill, Terry Nuif, Wes Bradford, Art Dunne.

2nd Row: Dave Tinkham, Carl Brunsting, Allen Jackson, Harry Smale, Tom Kelsey, Dave Ray, Carl Kreager, Bill Ohlenroth, Capt. Al Wahl, Charles Ortmann, Jim Wolter, Harry Allis, Ozzie Clark, Don Dufek, Joe Beel.

Front Row: Ted Kress, John Powers, Bob Hurley, Bill Billings, James Eldridge, Ralph Straffon, Richard Aartila, Jerry Burns, Russ Osterman, Bud Reeme, Bob Timm, Stanley King, Ralph Stribe.