The Holocene thermal maximum in the Nordic Seas

Autor(en)
M. Blaschek, H. Renssen
Abstrakt

The relatively warm early Holocene climate in the Nordic Seas, known as the Holocene thermal maximum (HTM), is often associated with an orbitally forced summer insolation maximum at 10 ka BP. The spatial and temporal response recorded in proxy data in the North Atlantic and the Nordic Seas reveals a complex interaction of mechanisms active in the HTM. Previous studies have investigated the impact of the Laurentide Ice Sheet (LIS), as a remnant from the previous glacial period, altering climate conditions with a continuous supply of melt water to the Labrador Sea and adjacent seas and with a downwind cooling effect from the remnant LIS. In our present work we extend this approach by investigating the impact of the Greenland Ice Sheet (GIS) on the early Holocene climate and the HTM. Reconstructions suggest melt rates of 13 mSv for 9 ka BP, which result in our model in an ocean surface cooling of up to 2 K near Greenland. Reconstructed summer SST gradients agree best with our simulation including GIS melt, confirming that the impact of the early Holocene GIS is crucial for understanding the HTM characteristics in the Nordic Seas area. This implies that modern and near-future GIS melt can be expected to play an active role in the climate system in the centuries to come.

Organisation(en)
Institut für Meteorologie und Geophysik
Externe Organisation(en)
Vrije Universiteit Amsterdam
Journal
Climate of the Past
Band
9
Seiten
1629-1643
Anzahl der Seiten
15
ISSN
1814-9324
DOI
https://doi.org/10.5194/cp-9-1629-2013
Publikationsdatum
2013
Peer-reviewed
Ja
ÖFOS 2012
105204 Klimatologie, 105205 Klimawandel, 105306 Ozeanographie, 105121 Sedimentologie
Schlagwörter
Link zum Portal
https://ucris.univie.ac.at/portal/de/publications/the-holocene-thermal-maximum-in-the-nordic-seas(22e8b409-3c4b-4355-b4d7-8588d1e91abd).html