Zobrazeno 1 - 10
of 18
pro vyhledávání: '"Keir Nichols"'
Autor:
Scott Braddock, Ryan A. Venturelli, Keir Nichols, Elliot Moravec, Grant V. Boeckmann, Seth Campbell, Greg Balco, Robert Ackert, David Small, Joanne S. Johnson, Nelia Dunbar, John Woodward, Sujoy Mukhopadhyay, Brent Goehring
Publikováno v:
Annals of Glaciology, Pp 1-11
We review successes and challenges from five recent subglacial bedrock drilling campaigns intended to find evidence for Antarctic Ice Sheet retreat during warm periods in the geologic past. Insights into times when the polar ice sheets were smaller t
Externí odkaz:
https://doaj.org/article/8299b31f1ad74314ac26f7109f1947ac
Autor:
Keir Nichols
Cosmogenic nuclide measurements in glacial deposits extend ourknowledge of glacier chronologies beyond the observational record. Theshort half-life of in situ cosmogenic 14C makes it particularly useful forstudying glacier chronologies, as resulting
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4c46e9f04d6db8803cc6a3ff90e7890c
https://doi.org/10.31223/x5m369
https://doi.org/10.31223/x5m369
Autor:
Greg Balco, Nathan Brown, Keir Nichols, Ryan A. Venturelli, Jonathan Adams, Scott Braddock, Seth Campbell, Brent Goehring, Joanne S. Johnson, Dylan H. Rood, Klaus Wilcken, Brenda Hall, John Woodward
Cosmogenic-nuclide concentrations in subglacial bedrock cores show that the West Antarctic Ice Sheet (WAIS) at a site between Thwaites and Pope glaciers was at least 35 m thinner than present in the past several thousand years and then subsequently t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6f71c6c07f564af7d7a2171de870e798
https://doi.org/10.5194/tc-2022-172
https://doi.org/10.5194/tc-2022-172
Autor:
Greg Balco, Nathan Brown, Keir Nichols, Ryan A. Venturelli, Jonathan Adams, Scott Braddock, Seth Campbell, Brent Goehring, Joanne S. Johnson, Dylan H. Rood, Klaus Wilcken, Brenda Hall, John Woodward
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2689a3451643ff06e9c795c3c69a6e0d
https://doi.org/10.5194/tc-2022-172-supplement
https://doi.org/10.5194/tc-2022-172-supplement
Autor:
Michelle Koutnik, Trevor R. Hillebrand, Howard Conway, Keir Nichols, Courtney King, John O. Stone, Brenda L. Hall, Brent M. Goehring, Mette K. Gillespie
Publikováno v:
The Cryosphere, Vol 15, Pp 3329-3354 (2021)
The Cryosphere
The Cryosphere
Chronologies of glacier deposits in the Transantarctic Mountains provide important constraints on grounding-line retreat during the last deglaciation in the Ross Sea. However, between Beardmore Glacier and Ross Island – a distance of some 600 km
Autor:
Keir Nichols, Brent M. Goehring
Publikováno v:
Geochronology. 1:43-52
Froth flotation is a commonly used procedure for separating feldspars and micas from quartz for the preparation of quartz mineral separates to carry out cosmogenic nuclide analysis. Whilst extracting carbon from quartz we observed in situ carbon-14 (
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 455:284-292
During 2015 and culminating in early 2016, we acquired a new Carbon Extraction and Graphitization System (CEGS) from Aeon Laboratories, L.L.C. (hereafter, “Aeon”), and adapted it for in situ cosmogenic sample processing. The Tulane University CEG
Publikováno v:
American Journal of Science. 319:255-286
We describe glacial-geological observations and cosmogenic-nuclide exposure ages from the vicinity of the present grounding line of Tucker Glacier, a large alpine glacier flowing from the mountains of northern Victoria Land, East Antarctica, into the
Publikováno v:
Geology. 47:291-294
Autor:
Trevor R. Hillebrand, John O. Stone, Michelle Koutnik, Courtney King, Howard Conway, Brenda Hall, Keir Nichols, Brent Goehring, Mette K. Gillespie
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dce696dc17f00eb079292d39d41ec411
https://doi.org/10.5194/tc-2020-356-supplement
https://doi.org/10.5194/tc-2020-356-supplement