@article {2708,
	title = {Multiple independent records of local glacier variability on Nuussuaq, West Greenland, during the Holocene},
	journal = {Quaternary Science Reviews},
	volume = {215},
	year = {2019},
	month = {Jan-07-2019},
	pages = {253 - 271},
	abstract = {The sensitivity of mountain glaciers to small-scale climate fluctuations makes records of their past extent among the best proxies for identifying spatio-temporal climate variability. Here we build on the few existing Holocene records of local glacier change in Greenland by using three independent geochronological methods{\textemdash}proglacial lake sediment analysis, cosmogenic 10Be surface-exposure dating, and in situ 14C burial modeling{\textemdash}to reconstruct continuous records of Holocene glacier variability on Nuussuaq, West Greenland. 10Be ages of perched boulders indicate eastern Nuussuaq was deglaciated between \~{}11.0 and 10.5 ka. Radiocarbon-dated sediments from two lakes on Nuussuaq contain mineral-rich layers between \~{}9.6 and 9.0 and \~{}8.7{\textendash}8.0 cal ka BP that may be correlative with nearby ice sheet moraines deposited in the early Holocene. Multiple proxies for glacier size indicate frequent, high-amplitude glacier fluctuations superimposed on net glacier growth during the late Holocene, with significant ice expansion phases at \~{}3.7 ka, 2.8 ka, and throughout the past \~{}2 ka. Mean 10Be ages from five nested moraine crests confirm that local glacier extents on Nuussuaq culminated during both the Little Ice Age [\~{}1470 C.E. (n = 3) and 1750 C.E. (n = 3)] and the preceding centuries (\~{}520{\textendash}1320 C.E.; n = 11). Results reveal that local glaciers on Nuussuaq episodically advanced and retreated at centennial timescales throughout the Holocene, most likely in response to regional climate changes in West Greenland superimposed on the progressive insolation-driven cooling trend in the Northern Hemisphere. Our new 10Be moraine chronologies coupled with other glacier-size proxies corroborate an emerging pattern of significant summer cooling and glacier expansion in the centuries prior to the Little Ice Age in the Arctic.},
	keywords = {Cosmogenic 10Be, Cosmogenic in situ 14C, Greenland, Holocene, lake sediment, Mountain glaciers, Neoglaciation},
	issn = {02773791},
	doi = {10.1016/j.quascirev.2019.05.007},
	url = {https://www.sciencedirect.com/science/article/pii/S0277379118308771},
	author = {Schweinsberg, Avriel D. and Briner, Jason P. and Licciardi, Joseph M. and Bennike, Ole and Lifton, Nathaniel A. and Graham, Brandon L. and Young, Nicol{\'a}s E. and Schaefer, Joerg M. and Zimmerman, Susan H.}
}
@article {2709,
	title = {Holocene mountain glacier history in the Sukkertoppen Iskappe area, southwest Greenland},
	journal = {Quaternary Science Reviews},
	volume = {197},
	year = {2018},
	month = {Jan-10-2018},
	pages = {142 - 161},
	abstract = {Mountain glaciers and ice caps (GIC) independent of the Greenland Ice Sheet respond rapidly to climate variations and records of their past extent provide information on the natural envelope of climate variability. Here, we use a multi-proxy approach that combines proglacial lake sediment analysis, cosmogenic nuclide surface-exposure dating (in situ 10Be and 14C), and radiocarbon dating of recently ice-entombed moss to generate a centennial-scale record of Holocene GIC fluctuations in southwestern Greenland. Following local deglaciation \~{}10-9 ka, sediments from proglacial Crash Lake record a glacier advance at \~{}9 ka that is indistinguishable from nearby ice sheet moraines, implying a synchronous response of GIC and the Greenland Ice Sheet to a centennial-scale climate event. Following this local glacier advance, GIC experienced net recession until \~{}4.6 ka. Radiocarbon ages of in situ moss (n = 29) and Crash Lake sediments reveal intervals of glacier expansion at \~{}1.8, 1.2 and 0.7 ka that are superimposed on an overall trend of net glacier expansion throughout the late Holocene. In situ 14C concentrations from bedrock adjacent to radiocarbon-dated moss samples further constrain the duration of ice cover through the Holocene in this region. We find that our glacier-size proxy records during the past \~{}4 ka are broadly consistent with relatively lower temperatures recorded in GISP2 and occur during, or following, intervals of volcanic perturbations. Thus, we speculate that volcanic activity, although less frequent and intense than in the early Holocene and during the Little Ice Age, may have led to centennial-scale variability imprinted on net glacier expansion due to decreasing summer insolation through the late Holocene.},
	keywords = {Cosmogenic in situ 14C, Glacier fluctuations, Greenland, Holocene, lake sediment, Neoglaciation},
	issn = {02773791},
	doi = {10.1016/j.quascirev.2018.06.014},
	url = {https://www.sciencedirect.com/science/article/pii/S0277379118302531},
	author = {Schweinsberg, Avriel D. and Briner, Jason P. and Miller, Gifford H. and Lifton, Nathaniel A. and Bennike, Ole and Graham, Brandon L.}
}
@article {2516,
	title = {Local glaciation in West Greenland linked to North Atlantic Ocean circulation during the Holocene},
	journal = {Geology},
	volume = {45},
	year = {2017},
	month = {Sep-03-2018},
	pages = {195 - 198},
	abstract = {Recent observations indicate that ice-ocean interaction drives much of the recent increase in mass loss from the Greenland Ice Sheet; however, the role of ocean forcing in driving past glacier change is poorly understood. To extend the observational record and our understanding of the ocean-cryosphere link, we used a multi-proxy approach that combines new data from proglacial lake sediments, C-14-dated in situ moss that recently emerged from beneath cold-based ice caps, and Be-10 ages to reconstruct centennial-scale records of mountain glacier activity for the past similar to 10 k. y. in West Greenland. Proglacial lake sediment records and C-14 dating of moss indicate the onset of Neoglaciation in West Greenland at ca. 5 ka with substantial snowline lowering and glacier expansion at ca. 3.7 ka followed by additional ice expansion phases at ca. 2.9, ca. 1.7, and ca. 1.4 ka and during the Little Ice Age. We find that widespread glacier growth at ca. 3.7 ka in West Greenland coincides with marked cooling and reduced strength of the West Greenland Current in Disko Bugt. The transition to cooler ocean conditions at ca. 3.7 ka identified in Disko Bugt is registered by marine proxy data farther afield in East Greenland and on the northwestern Icelandic shelf, implying large-scale paleoceanographic changes across the North Atlantic during this interval. The similarity between glacier change on West Greenland and multiple marine and terrestrial records across the North Atlantic suggests that glaciers are strongly influenced by changes in ocean circulation and consequently implies that the ocean-cryosphere teleconnection is a persistent feature of the Arctic system. },
	issn = {0091-7613},
	doi = {10.1130/G38114.1},
	url = {http://geology.gsapubs.org/lookup/doi/10.1130/G38114},
	author = {Schweinsberg, Avriel D. and Briner, Jason P. and Miller, Gifford H. and Bennike, Ole and Thomas, Elizabeth K.}
}
@article {2517,
	title = {A major increase in winter snowfall during the middle Holocene on western Greenland caused by reduced sea ice in Baffin Bay and the Labrador Sea},
	journal = {Geophysical Research Letters},
	volume = {45},
	year = {2016},
	month = {Apr-05-2018},
	pages = {5302 - 5308},
	abstract = {Recent observations indicate that ice-ocean interaction drives much of the recent increase in mass loss from the Greenland Ice Sheet; however, the role of ocean forcing in driving past glacier change is poorly understood. To extend the observational record and our understanding of the ocean-cryosphere link, we used a multi-proxy approach that combines new data from proglacial lake sediments, C-14-dated in situ moss that recently emerged from beneath cold-based ice caps, and Be-10 ages to reconstruct centennial-scale records of mountain glacier activity for the past similar to 10 k. y. in West Greenland. Proglacial lake sediment records and C-14 dating of moss indicate the onset of Neoglaciation in West Greenland at ca. 5 ka with substantial snowline lowering and glacier expansion at ca. 3.7 ka followed by additional ice expansion phases at ca. 2.9, ca. 1.7, and ca. 1.4 ka and during the Little Ice Age. We find that widespread glacier growth at ca. 3.7 ka in West Greenland coincides with marked cooling and reduced strength of the West Greenland Current in Disko Bugt. The transition to cooler ocean conditions at ca. 3.7 ka identified in Disko Bugt is registered by marine proxy data farther afield in East Greenland and on the northwestern Icelandic shelf, implying large-scale paleoceanographic changes across the North Atlantic during this interval. The similarity between glacier change on West Greenland and multiple marine and terrestrial records across the North Atlantic suggests that glaciers are strongly influenced by changes in ocean circulation and consequently implies that the ocean-cryosphere teleconnection is a persistent feature of the Arctic system. 
},
	doi = {10.1002/2016GL068513},
	url = {http://doi.wiley.com/10.1002/2016GL068513},
	author = {Thomas, Elizabeth K. and Briner, Jason P. and Ryan-Henry, John J. and Huang, Yongsong}
}
@article {2518,
	title = {The influence of ice marginal setting on early Holocene retreat rates in central West Greenland},
	journal = {Journal of Quaternary Science},
	volume = {30},
	year = {2015},
	month = {Jan-04-2015},
	pages = {271 - 280},
	abstract = {Ice sheet reconstructions from diverse ice margin settings, spanning multiple millennia, are needed to assess the reaction of the Greenland Ice Sheet (GrIS) to millennial-scale climatic forcing and to place historical records in a longer-term context. Here we present 18 new cosmogenic 10Be exposure ages and five new radiocarbon ages that constrain the early Holocene retreat of the GrIS in the Disko Bugt region in both a marine and a land-based setting. Results indicate similar rates of early Holocene retreat of \~{}40{\textendash}50 m a-1 from transects in Torsukattak fjord (marine setting) and the Naternaq area (land-based setting). We compile seven previously published chronologies of deglaciation from West Greenland, which yield early Holocene retreat rates ranging from 10 to 65 m a-1, similar to those determined for our two study areas. This work demonstrates that when averaged on millennial timescales, retreat rates were remarkably similar along the western GrIS margin. Furthermore, the retreat rates calculated here demonstrate that terrestrial sectors of ice sheets can retreat at net rates comparable to their marine counterparts.},
	doi = {10.1002/jqs.v30.310.1002/jqs.2778},
	url = {http://doi.wiley.com/10.1002/jqs.2778},
	author = {KELLEY, SAMUEL E. and Briner, Jason P. and ZIMMERMAN, SUSAN R. H.}
}
@article {2521,
	title = {The deglaciation and neoglaciation of Upernavik Isstr{\o}m, Greenland},
	journal = {Quaternary Research},
	volume = {80},
	year = {2013},
	month = {Jan-11-2013},
	pages = {459 - 467},
	abstract = {We constrain the history of the Greenland Ice Sheet margin during the Holocene at Upernavik Isstr{\o}m, a major ice stream in northwestern Greenland. Radiocarbon-dated sediment sequences from proglacial-threshold lakes adjacent to the present ice margin constrain deglaciation of the sites to older than 9.6 {\textpm} 0.1 ka. This age of deglaciation is confirmed with 10Be ages of 9.9 {\textpm} 0.1 ka from an island adjacent to the historical ice position. The lake sediment sequences also constrain the ice margin to have been less extensive than it is today for the remainder of the Holocene until ~ 1100 to ~ 700 yr ago, when it advanced into two lake catchments. The ice margin retreated back out of these lake catchments in the last decade. The early Holocene deglaciation in Melville Bugt, one of few locations around Greenland where a vast stretch of the current ice margin is marine-based, preceded deglaciation in most other parts of Greenland. Earlier deglaciation in this ice-sheet sector may have been caused by additional ablation mechanisms that apply to marine-based ice margins. Furthermore, despite ice-sheet models depicting this sector of Greenland as relatively stable throughout the Holocene, our data indicate a > 20 km advance-retreat cycle within the last millennium.},
	issn = {0033-5894},
	doi = {10.1016/j.yqres.2013.09.008},
	url = {https://doi.org/10.1016/j.yqres.2013.09.008},
	author = {Briner, Jason P. and {\r a}kansson, Lena and Bennike, Ole}
}
@article {2522,
	title = {Holocene temperature history at the western Greenland Ice Sheet margin reconstructed from lake sediments},
	journal = {Quaternary Science Reviews},
	volume = {59},
	year = {2013},
	month = {Jan-01-2013},
	pages = {87 - 100},
	abstract = {Predicting the response of the Greenland Ice Sheet to future climate change presents a major challenge to climate science. Paleoclimate data from Greenland can provide empirical constraints on past cryospheric responses to climate change, complementing insights from contemporary observations and from modeling. Here we examine sedimentary records from five lakes near Jakobshavn Isbr{\ae} in central West Greenland to investigate the timing and magnitude of major Holocene climate changes, for comparison with glacial geologic reconstructions from the region. A primary objective of this study is to constrain the timing and magnitude of maximum warmth during the early to middle Holocene positive anomaly in summer insolation. Temperature reconstructions from subfossil insect (chironomid) assemblages suggest that summer temperatures were warmer than present by at least 7.1 ka (the beginning of the North Lake record; ka = thousands of years before present), and that the warmest millennia of the Holocene occurred in the study area between 6 and 4 ka. Previous studies in the Jakobshavn region have found that the local Greenland Ice Sheet margin was most retracted behind its present position between 6 and 5 ka, and here we use chironomids to estimate that local summer temperatures were 2{\textendash}3 {\textdegree}C warmer than present during that time of minimum ice sheet extent. As summer insolation declined through the late Holocene, summer temperatures cooled and the local ice sheet margin expanded. Gradual, insolation-driven millennial-scale temperature trends in the study area were punctuated by several abrupt climate changes, including a major transient event recorded in all five lakes between 4.3 and 3.2 ka, which overlaps in timing with abrupt climate changes previously documented around the North Atlantic region and farther afield at \~{}4.2 ka.},
	issn = {02773791},
	doi = {10.1016/j.quascirev.2012.10.024},
	url = {https://doi.org/10.1016/j.quascirev.2012.10.024},
	author = {Axford, Yarrow and Losee, Shanna and Briner, Jason P. and Francis, Donna R. and Langdon, Peter G. and Walker, Ian R.}
}
@article {2523,
	title = {Constraining Holocene 10Be production rates in Greenland},
	journal = {Journal of Quaternary Science},
	volume = {27},
	year = {2012},
	month = {Jan-01-2012},
	pages = {2 - 6},
	abstract = {The absence of a production rate calibration experiment on Greenland has limited the ability to link 10Be exposure dating chronologies of ice-margin change to independent records of rapid climate change. We use radiocarbon age control on Holocene glacial features near Jakobshavn Isbr{\ae}, western Greenland, to investigate 10Be production rates. The radiocarbon chronology is inconsistent with the 10Be age calculations based on the current globally averaged 10Be production rate calibration data set, but is consistent with the 10Be production rate calibration data set from north-eastern North America, which includes a calibration site nearby on north-eastern Baffin Island. Based on the best-dated feature available from the Jakobshavn Isbr{\ae} forefield, we derive a 10Be production rate value of 3.98 {\textpm} 0.24 atoms g a-1, using the {\textquoteleft}St{\textquoteright} scaling scheme, which overlaps with recently published reference 10Be production rates. We suggest that these 10Be production rate data, or the very similar data from north-eastern North America, are used on Greenland. Copyright {\textcopyright} 2011 John Wiley \& Sons, Ltd.},
	doi = {10.1002/jqs.1562},
	url = {http://doi.wiley.com/10.1002/jqs.1562},
	author = {Briner, Jason P. and Young, {\'a}s E. and Goehring, Brent M. and Schaefer, Joerg M.}
}
@article {2524,
	title = {Response of a marine-terminating Greenland outlet glacier to abrupt cooling 8200 and 9300 years ago},
	journal = {Geophysical Research Letters},
	volume = {38},
	year = {2011},
	month = {Apr-12-2013},
	pages = {n/a - n/a},
	abstract = {Long-term records of Greenland outlet-glacier change extending beyond the satellite era can inform future predictions of Greenland Ice Sheet behavior. Of particular relevance is elucidating the Greenland Ice Sheet{\textquoteright}s response to decadal- and centennial-scale climate change. Here, we reconstruct the early Holocene history of Jakobshavn Isbr{\ae}, Greenland{\textquoteright}s largest outlet glacier, using 10Be surface exposure ages and 14C-dated lake sediments. Our chronology of ice-margin change demonstrates that Jakobshavn Isbr{\ae} advanced to deposit moraines in response to abrupt cooling recorded in central Greenland ice cores ca. 8,200 and 9,300 years ago. While the rapid, dynamically aided retreat of many Greenland outlet glaciers in response to warming is well documented, these results indicate that marine-terminating outlet glaciers are also able to respond quickly to cooling. We suggest that short lag times of high ice flux margins enable a greater magnitude response of marine-terminating outlets to abrupt climate change compared to their land-terminating counterparts.},
	doi = {10.1029/2011GL049639},
	url = {http://doi.wiley.com/10.1029/2011GL049639},
	author = {Young, {\'a}s E. and Briner, Jason P. and Axford, Yarrow and Csatho, Beata and Babonis, Greg S. and Rood, Dylan H. and Finkel, Robert C.}
}
