TY - JOUR
T1 - Late-Holocene diatom derived seasonal variability in hydrological conditions off Disko Bay, West Greenland
AU - Krawczyk, Diana W.
AU - Witkowski, Andrzej
AU - Lloyd, Jeremy
AU - Moros, Matthias
AU - Harff, Jan
AU - Kuijpers, Antoon
N1 - Funding Information:
The authors wish to thank the Deutsche Forschungsgemeinschaft (DFG) for funding the project ‘Disco Climate’ ( MO 1422/2-1 ). We also acknowledge helpful information provided by participants of the 2007 R/V Maria S. Merian cruise to western Greenland waters in the frames of ‘Disko Climate’ project. We wish to express our gratitude to Prof. Søren Rysgaard, Dr Thomas Juul-Pedersen, Dr Kristine Engel Arendt and Dr Sejr Mikael Kristian for supplying phytoplankton material and helpful discussions on modern hydrological changes off West and East Greenland in the frame of MarineBasic-Nuuk and MarineBasic-Zackenberg programmes, as part of the Greenland Ecosystem Monitoring Programme. The authors also thank the Narodowe Centrum Nauki (NCN) for financial support of the West–East Greenland project (No. DEC-2011/03/N/ST10/05794 ). We wish to express our gratitude to Dr Itsuki Suto for help with identification of the key Chaetoceros resting spores (count! rest! count!). We also thank two anonymous reviewers for important and helpful comments.
PY - 2013/5/1
Y1 - 2013/5/1
N2 - A decadally resolved diatom record from a sediment core collected from Disko Bay, central West Greenland, reveals variations in hydrological conditions for the late Holocene. The diatom flora record two clear trends in surface water temperatures: a pronounced cooling of surface waters during the Medieval Climate Anomaly (MCA) and a progressive warming in surface waters during the Little Ice Age (LIA), previously identified in North Atlantic studies. Our data support the existence of a previously identified anti-phase relationship between surface water temperatures off West Greenland and climate events recorded in the north-east Atlantic. The diatom assemblages show relatively cool surface water conditions during warmer climatic intervals, e.g. 3.6-2.7 cal. ka BP, the MCA, while relatively warm surface water conditions during colder climatic periods, e.g. the Dark Ages (DA) and the LIA. The exception to this is the Roman Warm Period (RWP), which in West Greenland shows warmer surface waters and climatic conditions. Our data also show the existence of anti-phase relationship between surface and sub-surface water temperatures in Disko Bay during the interval 3.6-2.7 cal. ka BP (cooler surface with warmer subsurface waters) and towards the end of the LIA (warmer surface and cooler sub-surface waters). These anti-phases patterns are possibly linked to: 1) the local spring-summer hydrological conditions (e.g. warmer climatic intervals), such as meltwater flux from sea ice/continental ice and water stratification, and 2) large-scale ocean-climate interactions (e.g. cooler climatic intervals) within the North Atlantic Oscillation (NAO)-type climate see-saw between West Greenland and north-west Europe associated with variability in the Atlantic Meridional Overturning Circulation (AMOC).
AB - A decadally resolved diatom record from a sediment core collected from Disko Bay, central West Greenland, reveals variations in hydrological conditions for the late Holocene. The diatom flora record two clear trends in surface water temperatures: a pronounced cooling of surface waters during the Medieval Climate Anomaly (MCA) and a progressive warming in surface waters during the Little Ice Age (LIA), previously identified in North Atlantic studies. Our data support the existence of a previously identified anti-phase relationship between surface water temperatures off West Greenland and climate events recorded in the north-east Atlantic. The diatom assemblages show relatively cool surface water conditions during warmer climatic intervals, e.g. 3.6-2.7 cal. ka BP, the MCA, while relatively warm surface water conditions during colder climatic periods, e.g. the Dark Ages (DA) and the LIA. The exception to this is the Roman Warm Period (RWP), which in West Greenland shows warmer surface waters and climatic conditions. Our data also show the existence of anti-phase relationship between surface and sub-surface water temperatures in Disko Bay during the interval 3.6-2.7 cal. ka BP (cooler surface with warmer subsurface waters) and towards the end of the LIA (warmer surface and cooler sub-surface waters). These anti-phases patterns are possibly linked to: 1) the local spring-summer hydrological conditions (e.g. warmer climatic intervals), such as meltwater flux from sea ice/continental ice and water stratification, and 2) large-scale ocean-climate interactions (e.g. cooler climatic intervals) within the North Atlantic Oscillation (NAO)-type climate see-saw between West Greenland and north-west Europe associated with variability in the Atlantic Meridional Overturning Circulation (AMOC).
KW - Anti-phase
KW - Diatoms
KW - Hydrological conditions
KW - Little Ice Age
KW - West Greenland
UR - http://www.scopus.com/inward/record.url?scp=84874676451&partnerID=8YFLogxK
U2 - 10.1016/j.quascirev.2013.01.025
DO - 10.1016/j.quascirev.2013.01.025
M3 - Article
VL - 67
SP - 93
EP - 104
JO - Quaternary Science Reviews
JF - Quaternary Science Reviews
SN - 0277-3791
ER -
