Mass loss from the southern half of the Greenland Ice Sheet since the Little Ice Age Maximum: - GRISO workshop
Research output: Contribution to conference › Poster › Research
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Mass loss from the southern half of the Greenland Ice Sheet since the Little Ice Age Maximum : - GRISO workshop. / Kjeldsen, Kristian Kjellerup; Kjær, Kurt H.; Bjørk, Anders Anker; Khan, Shfaqat Abbas; Korsgaard, Niels Jákup; Funder, Svend Visby; Larsen, Nicolaj Krog; Vinther, Bo Møllesøe; Andresen, Camilla S; Long, Antony J; Woodroffe, Sarah A; Hansen, Eric Steen; Odgaard, Bent Vad; Olsen, Jesper; Bamber, Jonathan L.; van den Broeke, Michiel; Willerslev, Eske.
2013. Poster session presented at GReenland Ice Sheet Ocean interactions, Beverly, MA, United States.Research output: Contribution to conference › Poster › Research
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T1 - Mass loss from the southern half of the Greenland Ice Sheet since the Little Ice Age Maximum
AU - Kjeldsen, Kristian Kjellerup
AU - Kjær, Kurt H.
AU - Bjørk, Anders Anker
AU - Khan, Shfaqat Abbas
AU - Korsgaard, Niels Jákup
AU - Funder, Svend Visby
AU - Larsen, Nicolaj Krog
AU - Vinther, Bo Møllesøe
AU - Andresen, Camilla S
AU - Long, Antony J
AU - Woodroffe, Sarah A
AU - Hansen, Eric Steen
AU - Odgaard, Bent Vad
AU - Olsen, Jesper
AU - Bamber, Jonathan L.
AU - van den Broeke, Michiel
AU - Willerslev, Eske
PY - 2013/6/4
Y1 - 2013/6/4
N2 - Northern hemisphere temperatures reached their Holocene minimum and most glaciers reached their maximum during The Little Ice Age (LIA), but the timing of specific cold intervals is site-specific. In southern Greenland, we have compiled data from organic matter incorporated in LIA sediments, used as a signal for ice-free terrain being overridden by LIA glacier advances, and data from threshold lakes showing the onset of glacier-fed lakes, thus revealing the advance-maximum phase initiating the LIA. Finally, we have compiled lichenometry results indicating the onset of bedrock vegetation succeeding ice retreat. Our results show that the advance of glaciersduring the LIA occurs early after the Medieval Warm Period terminating soon after 1200 AD and culminates c. 1500-1600 AD. Historical maps also show that many glaciers on the western coast occupy a still-stand near the LIA maximum until 1900 AD before retreat commence.Thus in southern Greenland, we define LIA as the period between the first signs of Late Holocene glacier readvance and the latest onset of retreat – i.e. from ca. 1200 to c. 1900. During this period northern hemisphere annual mean temperatures, although fluctuating, were generally below the 1961-1990 average, with the coldest interval between c. 1600 and 1800. Even though winter temperatures may have dominated the cooling, also the summer temperatures which are most closely correlated with glacier mass balances, dropped, to c. 0.6 below the average in the northern hemisphere including the Arctic. Furthermore, the glacier response seems to be mirroredby a oceanic cooling between 500-1000 AD, followed by onset of the LIA at 1150-1250 AD as seen in the relative strength of warm subsurface water and the influence of the East Greenland Current.
AB - Northern hemisphere temperatures reached their Holocene minimum and most glaciers reached their maximum during The Little Ice Age (LIA), but the timing of specific cold intervals is site-specific. In southern Greenland, we have compiled data from organic matter incorporated in LIA sediments, used as a signal for ice-free terrain being overridden by LIA glacier advances, and data from threshold lakes showing the onset of glacier-fed lakes, thus revealing the advance-maximum phase initiating the LIA. Finally, we have compiled lichenometry results indicating the onset of bedrock vegetation succeeding ice retreat. Our results show that the advance of glaciersduring the LIA occurs early after the Medieval Warm Period terminating soon after 1200 AD and culminates c. 1500-1600 AD. Historical maps also show that many glaciers on the western coast occupy a still-stand near the LIA maximum until 1900 AD before retreat commence.Thus in southern Greenland, we define LIA as the period between the first signs of Late Holocene glacier readvance and the latest onset of retreat – i.e. from ca. 1200 to c. 1900. During this period northern hemisphere annual mean temperatures, although fluctuating, were generally below the 1961-1990 average, with the coldest interval between c. 1600 and 1800. Even though winter temperatures may have dominated the cooling, also the summer temperatures which are most closely correlated with glacier mass balances, dropped, to c. 0.6 below the average in the northern hemisphere including the Arctic. Furthermore, the glacier response seems to be mirroredby a oceanic cooling between 500-1000 AD, followed by onset of the LIA at 1150-1250 AD as seen in the relative strength of warm subsurface water and the influence of the East Greenland Current.
M3 - Poster
Y2 - 4 June 2013 through 7 June 2013
ER -
ID: 48849968