Zobrazeno 1 - 10
of 48
pro vyhledávání: '"J. P. Schaefer"'
Autor:
A. Balter-Kennedy, J. M. Schaefer, G. Balco, M. A. Kelly, M. R. Kaplan, R. Schwartz, B. Oakley, N. E. Young, J. Hanley, A. M. Varuolo-Clarke
Publikováno v:
Climate of the Past, Vol 20, Pp 2167-2190 (2024)
We present 40 new 10Be exposure ages of moraines and other glacial deposits left behind by the southeastern sector of the Laurentide Ice Sheet (LIS) in southern New England and New York, summarize the regional moraine record, and interpret the datase
Externí odkaz:
https://doaj.org/article/6325adc2f9ec4b7e9800d64d9945a87a
Publikováno v:
Climate of the Past, Vol 20, Pp 625-636 (2024)
Alpine glacier-based temperature reconstructions spanning the last deglaciation provide critical constraints on local to regional climate change and have been reported from several formerly glaciated regions around the world yet remain sparse from hi
Externí odkaz:
https://doaj.org/article/2a03ac568b2c4f83a6f419290c607bb5
Autor:
B. L. Graham, J. P. Briner, N. E. Young, A. Balter-Kennedy, M. Koppes, J. M. Schaefer, K. Poinar, E. K. Thomas
Publikováno v:
The Cryosphere, Vol 17, Pp 4535-4547 (2023)
Glacial erosion creates diagnostic landscapes and vast amounts of sediment. However, knowledge about the rate at which glaciers erode and sculpt bedrock and the proportion of quarried (plucked) versus abraded material is limited. To address this, we
Externí odkaz:
https://doaj.org/article/aecc9315c9b84b58a6b961d283bf9ccf
Autor:
A. C. Hawkins, B. Menounos, B. M. Goehring, G. Osborn, B. M. Pelto, C. M. Darvill, J. M. Schaefer
Publikováno v:
The Cryosphere, Vol 17, Pp 4381-4397 (2023)
Over the last century, northwestern Canada experienced some of the highest rates of tropospheric warming globally, which caused glaciers in the region to rapidly retreat. Our study seeks to extend the record of glacier fluctuations and assess climate
Externí odkaz:
https://doaj.org/article/65934c3ad0be4edcb52a531b2f009fe2
Autor:
A. Balter-Kennedy, J. M. Schaefer, R. Schwartz, J. L. Lamp, L. Penrose, J. Middleton, J. Hanley, B. Tibari, P.-H. Blard, G. Winckler, A. J. Hidy, G. Balco
Publikováno v:
Geochronology, Vol 5, Pp 301-321 (2023)
Here, we present cosmogenic-10Be and cosmogenic-3He data from Ferrar dolerite pyroxenes in surficial rock samples and a bedrock core from the McMurdo Dry Valleys, Antarctica, with the goal of refining the laboratory methods for extracting beryllium f
Externí odkaz:
https://doaj.org/article/d5a14dc692d848da803f3acd24109377
Autor:
J. P. Briner, C. K. Walcott, J. M. Schaefer, N. E. Young, J. A. MacGregor, K. Poinar, B. A. Keisling, S. Anandakrishnan, M. R. Albert, T. Kuhl, G. Boeckmann
Publikováno v:
The Cryosphere, Vol 16, Pp 3933-3948 (2022)
Direct observations of the size of the Greenland Ice Sheet during Quaternary interglaciations are sparse yet valuable for testing numerical models of ice-sheet history and sea level contribution. Recent measurements of cosmogenic nuclides in bedrock
Externí odkaz:
https://doaj.org/article/8b836063bbb74a5497db7e95c13b9c34
Autor:
I. Schimmelpfennig, J. M. Schaefer, J. Lamp, V. Godard, R. Schwartz, E. Bard, T. Tuna, N. Akçar, C. Schlüchter, S. Zimmerman
Publikováno v:
Climate of the Past, Vol 18, Pp 23-44 (2022)
Mid-latitude mountain glaciers are sensitive to local summer temperature changes. Chronologies of past glacier fluctuations based on the investigation of glacial landforms therefore allow for a better understanding of natural climate variability at l
Externí odkaz:
https://doaj.org/article/63e664cd222d420f8c15a054552fcf5a
Publikováno v:
Climate of the Past, Vol 17, Pp 2451-2479 (2021)
Glaciers preserve climate variations in their geological and geomorphological records, which makes them prime candidates for climate reconstructions. Investigating the glacier–climate system over the past millennia is particularly relevant first be
Externí odkaz:
https://doaj.org/article/8938fb37ed7345e29ad4dd4ad51add7a
Publikováno v:
Geochronology, Vol 3, Pp 505-523 (2021)
The preservation of cosmogenic nuclides that accumulated during periods of prior exposure but were not subsequently removed by erosion or radioactive decay complicates interpretation of exposure, erosion, and burial ages used for a variety of geomorp
Externí odkaz:
https://doaj.org/article/eff371f5d6414b03b17ac2cbf7ae172e
Autor:
N. E. Young, A. J. Lesnek, J. K. Cuzzone, J. P. Briner, J. A. Badgeley, A. Balter-Kennedy, B. L. Graham, A. Cluett, J. L. Lamp, R. Schwartz, T. Tuna, E. Bard, M. W. Caffee, S. R. H. Zimmerman, J. M. Schaefer
Publikováno v:
Climate of the Past, Vol 17, Pp 419-450 (2021)
Sometime during the middle to late Holocene (8.2 ka to ∼ 1850–1900 CE), the Greenland Ice Sheet (GrIS) was smaller than its current configuration. Determining the exact dimensions of the Holocene ice-sheet minimum and the duration that the ice ma
Externí odkaz:
https://doaj.org/article/b3d2a184b3204d7385753d3927eb9fdb