TY - JOUR
T1 - A diatom-based sea-ice reconstruction for the Vaigat Strait (Disko Bugt, West Greenland) over the last 5000 yr
AU - Sha, Longbin
AU - Jiang, Hui
AU - Seidenkrantz, Marit-Solveig
AU - Knudsen, Karen Luise
AU - Olsen, Jesper
AU - Kuijpers, Antoon
AU - Liu, Yanguang
N1 - Funding Information:
Core DA06-139G was collected in 2006 during a cruise of RV Dana funded by GEUS , the Bureau of Mineral Resources in Nuuk, and NunaOil, Greenland . We thank the captain and crew for their engagement during the work at sea, and John Boserup (GEUS) for assisting with sediment coring. Kaarina Weckström and Camilla S. Andresen are also acknowledged for sharing their data. We acknowledge the financial supports from the National Natural Science Foundation of China (grants 41176048 , 40976115 ), International cooperation project of Chinese Arctic and Antarctic Administration, SOA (grant IC201309 ) and 111 project ( B08022 ). This paper is also a contribution to the Danish Council for Independent Research, Natural Sciences (FNU) projects “Green-Ice” (09-072321), “TROPOLINK” (09-069833) and OCEANHEAT (12-126709). The research leading to these results has received funding from the European Union 's Seventh Framework programme (FP7/2007-2013) under grant agreement no. 243908 , ‘Past4uture’, Climate change – Learning from the past climate. This is Past4Future contribution no.72. Finally, we are grateful to two anonymous referees and the Editor, Prof. Finn Surlyk for the constructive and useful comments, and to Prof. John Anderson for the constructive suggestions and correction of the English text.
PY - 2014/6/1
Y1 - 2014/6/1
N2 - A diatom-based sea-ice concentration (SIC) transfer function was developed by using 72 surface samples from west of Greenland and around Iceland, and validated against associated modern SIC. Canonical correspondence analysis on surface sediment diatoms and monthly average of SIC indicated that April SIC is the most important environmental factor controlling the distribution of diatoms in the area, justifying the development of a diatom-based SIC transfer function. The agreement between reconstructed SIC based on diatoms from West Greenland and the satellite and modelled sea-ice data during the last ~. 75. yr suggests that the diatom-based SIC reconstruction is reliable for studying the palaeoceanography off West Greenland.Relatively warm conditions with a strong influence of the Irminger Current (IC) were indicated for the early part of the record (~. 5000-3860. cal. yr BP), corresponding in time to the latest part of the Holocene Thermal Maximum. Between 3860 and 1510. cal. yr BP, April SIC oscillated around the mean value (55%) and during the time interval 1510-1120. cal. yr BP and after 650. cal. yr BP was above the mean, indicating more extensive sea-ice cover in Disko Bugt.Agreement between reconstructed April SIC and changes in the diatom species suggests that the sea-ice condition in Disko Bugt was strongly influenced by variations in the relative strength of two components of the West Greenland Current, i.e. the cold East Greenland Current and the relatively warm IC. Further analysis of the reconstructed SIC record suggests that solar radiation may be an important forcing mechanism behind the historic sea-ice changes.
AB - A diatom-based sea-ice concentration (SIC) transfer function was developed by using 72 surface samples from west of Greenland and around Iceland, and validated against associated modern SIC. Canonical correspondence analysis on surface sediment diatoms and monthly average of SIC indicated that April SIC is the most important environmental factor controlling the distribution of diatoms in the area, justifying the development of a diatom-based SIC transfer function. The agreement between reconstructed SIC based on diatoms from West Greenland and the satellite and modelled sea-ice data during the last ~. 75. yr suggests that the diatom-based SIC reconstruction is reliable for studying the palaeoceanography off West Greenland.Relatively warm conditions with a strong influence of the Irminger Current (IC) were indicated for the early part of the record (~. 5000-3860. cal. yr BP), corresponding in time to the latest part of the Holocene Thermal Maximum. Between 3860 and 1510. cal. yr BP, April SIC oscillated around the mean value (55%) and during the time interval 1510-1120. cal. yr BP and after 650. cal. yr BP was above the mean, indicating more extensive sea-ice cover in Disko Bugt.Agreement between reconstructed April SIC and changes in the diatom species suggests that the sea-ice condition in Disko Bugt was strongly influenced by variations in the relative strength of two components of the West Greenland Current, i.e. the cold East Greenland Current and the relatively warm IC. Further analysis of the reconstructed SIC record suggests that solar radiation may be an important forcing mechanism behind the historic sea-ice changes.
KW - Diatoms
KW - Holocene
KW - Sea-ice concentration (SIC)
KW - Transfer function
KW - West Greenland
UR - http://www.scopus.com/inward/record.url?scp=84898629917&partnerID=8YFLogxK
U2 - 10.1016/j.palaeo.2014.03.028
DO - 10.1016/j.palaeo.2014.03.028
M3 - Article
VL - 403
SP - 66
EP - 79
JO - Palaeogeography, Palaeoclimatology, Palaeoecology
JF - Palaeogeography, Palaeoclimatology, Palaeoecology
ER -