Mathematics – Logic
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusm.a43c..02w&link_type=abstract
American Geophysical Union, Spring Meeting 2004, abstract #A43C-02
Mathematics
Logic
0305 Aerosols And Particles (0345, 4801), 0345 Pollution: Urban And Regional (0305), 0370 Volcanic Effects (8409), 1620 Climate Dynamics (3309), 1827 Glaciology (1863)
Scientific paper
The Arctic represents one of the key regions on Earth in our efforts to document and understand global change. The St. Elias mountain range in the southwestern Yukon Territory has recently been the focus of an international ice core research.. The broad elevational extent of snow accumulation zones in this region (ranging from 2500 to 5300 m asl) allows for the detailed investigation of environmental change extending from the planetary boundary layer through to the free troposphere via the collection and analysis of ice cores from different elevations. Multi-parameter, high resolution glaciochemical records are currently available from the Northwest Col on Mt. Logan (5340 m asl, 103 m deep; 270 year record;) and from three cores recovered from the Eclipse Icefield (3107 m asl) in 1996 (160 m deep; 100 year record) and in 2002 (345 m and 140 m deep). Snow accumulation rates at Eclipse are about 5 times larger than the summit average of 0.30 m water equivalent. Despite their close proximity, the climate signals recorded on the summit of Mt. Logan also differ from those at Eclipse. For example, while the Mt. Logan record shows no increase in sulfate or nitrate deposition over the past 100 years, all three Eclipse cores shows a clear increase in nitrate and sulfate deposition beginning in the late 1940s due to an increase in anthropogenic emissions in Eurasia during this time period. Over the last century, the sulfate time-series from Eclipse records from 32 discrete volcanic events, primarily from Alaskan, Aleutian, or Kamchatkan eruptions, while the summit site only records 8 volcanic events. The Eclipse summer d18O record displays a significant positive relationship with summer temperatures at both coastal and interior Alaskan sites, while the Mt. Logan d18O time-series does not correlate well with instrumental temperature records or most circum-Arctic paleoclimate records. Conversely, the summit ice core accumulation time-series strongly correlates with instrumental precipitation records from Japan and with indices of the El Nino- Southern Oscillation on both interannual and interdecadal time scales suggesting the summit records are uniquely situated for studies of global teleconnection patterns. Our results to date indicate that the two sites sample different air masses and that boundary layer dynamics play an important role in the glaciochemical signals preserved at each location. The Northwest Col and Eclipse records, in conjunction with analysis of new ice cores already recovered from Prospector-Russell Col (5300 m; 187 m; circa 35,000 years) by the Geological Survey of Canada and King Col (4135 m asl; 220 m deep; circa 2,000 year record) on the Logan Massif by the National Institute for Polar Research (Japan) offers an unprecedented opportunity for paleoclimate reconstruction along a vertical transect in the St. Elias Mountains and should provide a rich and multi-layered contribution to our understanding boundary layer dynamics and Holocene environmental change in the region.
Fisher David
Holdsworth Gerald
Kreutz Karl J.
Mayewski Paul A.
Wake Cameron P.
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