986 resultados para Wolff, Charlotta
Resumo:
Ice cores provide a record of changes in dust flux to Antarctica, which is thought to reflect changes in atmospheric circulation and environmental conditions in dust source areas (Forster et al., 2007; Diekmann et al. 2000, doi:10.1016/S0031-0182(00)00138-3; Winckler et al., 2008, doi:10.1126/science.1150595; Reader et al., 1999, doi:10.1029/1999JD900033; Mahowald et al., 1999, doi:10.1029/1999JD900084; Petit et al., 1999, doi:10.1038/20859; 1990, doi:10.1038/343056a0 Delmonte et al., 2009, doi:10.1029/2008GL033382; Lambert et al., 2008, doi:10.1038/nature06763). Isotopic tracers suggest that South America is the dominant source of the dust (Grousset et al., 1992, doi:10.1016/0012-821X(92)90177-W; Basile et al., 1997, doi:10.1016/S0012-821X(96)00255-5; Gaiero et al., 2007, doi:10.1016/j.chemgeo.2006.11.003), but it is unclear what led to the variable deposition of dust at concentrations 20-50 times higher than present in glacial-aged ice (Petit et al., 1990, doi:10.1038/343056a0; Lambert et al., 2008, doi:10.1038/nature06763). Here we characterize the age and composition of Patagonian glacial outwash sediments, to assess the relationship between the Antarctic dust record from Dome C (refs Lambert et al., 2008, doi:10.1038/nature06763; Wolff et al., 2006, doi:10.1038/nature04614) and Patagonian glacial fluctuations (Sugden et al., 2005; McCulloch et al., 2005, doi:10.1111/j.0435-3676.2005.00260.x; Kaplan et al., 2008, doi:10.1016/j.quascirev.2007.09.013) for the past 80,000 years. We show that dust peaks in Antarctica coincide with periods in Patagonia when rivers of glacial meltwater deposited sediment directly onto easily mobilized outwash plains. No dust peaks were noted when the glaciers instead terminated directly into pro-glacial lakes. We thus propose that the variable sediment supply resulting from Patagonian glacial fluctuations may have acted as an on/off switch for Antarctic dust deposition. At the last glacial termination, Patagonian glaciers quickly retreated into lakes, which may help explain why the deglacial decline in Antarctic dust concentrations preceded the main phase of warming, sea-level rise and reduction in Southern Hemisphere sea-ice extent (Wolff et al., 2006, doi:10.1038/nature04614).
Resumo:
Wolff, R.L. 19th cent. fiction,
Resumo:
Back Row: Dick Lindenfeld, Frank Gusich, Robert Rosema, Mike Smith, William Ross, Dennis Connell, Scott Hulke, Tom Alexander, ?, Jim Schmitz
8th Row: Ed Woolley, Tom Huiskens, Paul Seymour, Reggie McKenzie, Donald Shaw, Jim Brandstatter, Mike Oldham, Fred Grambau, Tom Beckman
7th Row: Guy Murdock, Fritz Seyferth, Bruce Elliott, Allen Carpenter, Mike Keller, Dave Zuccarelli, Dana Coin, Preston Henry, George Mans
6th Row: Michael Taylor, Tom Darden, Tom Nieman, John Wolff, Gerald Dutcher, Ed Baldwin, Glen Doughty, William Taylor, Louie Lee*
5th Row: Bill Berutti, Thomas Takach, Lance Scheffler, Dick McCoy, Pete Newell, Dan Parks, Bill Harris, Greg Harrison, Jim Young*
4th Row: George Zuganelis, Paul Staroba, Jim Betts, Jack Harpring, Marty Huff, Ed Moore, Don Moorehead,Tim Killian, Frank Maloney*,
3rd Row: Henry Hill, Robert Ritley, Joe Lukz, Timothy Wadhams, Richard Brown, Eric Federico, Mark Werner, Dan Dierdorf, Robert White, Chuck Stobart*
2nd Row: Jerry Hanlon*, Dick Hunter*, Gary Moeller*, Larry Smith* Morris Abrahams, Jerry Imsland, Joe Jones, Barry Pierson, Richard Caldarazzo, Al Francis, Peter Sarantos, Werner Hall, Mike Hankwitz, coach Bo Schembechler
Front Row: Phil Seymour, Frank Titas, Bob Baumgartner, Tom Curtis, captain Jim Mandich, Brian Healey, John Gabler, Garvie Craw, Cecil Pryor
* = assistant coaches
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Back Row: Trainer Mike Willie, Assistant coaches Frank Maloney, Jerry Hanlon, George Mans, Tirrel Burton, Gary Moeller, Dick Hunter, Chuck Stobart, Jim Young, Larry Smith, Manager Neil Hiller, Head Trainer Lindsy McLean
5th Row: Tom Ferchau, John Pighee, Greg Ellis, Bob Mogulich, Tony Smith, Tom Poplawski, Mark Duffy, Bill Moran, Bill Haslett, Don Eaton, Carroll Damron, Bob Swan, Coach Bo Schembechler
4th Row: Bill Ross, Gary Coakley, Bob Rosema, Mike Smith, John Cilluffo, Randy Logan, Tom Kee, Bill Hart, Tom Coyle, Jack McBride, Jerry Schumacher, Jim Coode, Bo Rather, John Daniels
3rd Row: Frank Gusich, Bruce Elliott, Butch Carpenter, Tom Beckman, Mike Oldham, Reggie McKenzie, Fritz Seyferth, Dana Coin, Tom Huiskens, Jim Brandstatter, Dave Zuccarelli, Preston Henry, Paul Seymour, Scott Hulke
2nd Row: Greg Harrison, Bill Berutti, Ed Baldwin, Tom Nieman, Lance Scheffler, Jerry Dutcher, Fred Grambau, Tom Darden, Glenn Doughty, Guy Murdock, Mike Keller, Bill Taylor, Mike Taylor, John Wolff
Front Row: Marty Huff, Pete Newell, Ed Moore, Dan Dierdorf, Tim Killian, Jack Harpring, Co-captain Henry Hill, Co-captain Don Moorhead, Paul Staroba, Werner Hall, Dick McCoy, Bill Harris, Phil Seymour, Jim Betts.
Resumo:
Wolff, R.L. 19th cent. fiction,
