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Ruth, Urs (2007): Dust concentration in the NGRIP ice core. PANGAEA,, Supplement to: Ruth, Urs; Bigler, Matthias; Röthlisberger, Regine; Siggaard-Andersen, Marie-Louise; Kipfstuhl, Sepp; Goto-Azuma, Kumiko; Hansson, Margareta E; Johnsen, Sigfús Jóhann; Lu, Huayu; Steffensen, Jørgen Peder (2007): Ice core evidence for a very tight link between North Atlantic and east Asian glacial climate. Geophysical Research Letters, 34, L03706,

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Corresponding millennial-scale climate changes have been reported from the North Atlantic region and from east Asia for the last glacial period on independent timescales only. To assess their degree of synchrony we suggest interpreting Greenland ice core dust parameters as proxies for the east Asian monsoon systems. This allows comparing North Atlantic and east Asian climate on the same timescale in high resolution ice core data without relative dating uncertainties. We find that during Dansgaard-Oeschger events North Atlantic region temperature and east Asian storminess were tightly coupled and changed synchronously within 5-10 years with no systematic lead or lag, thus providing instantaneous climatic feedback. The tight link between North Atlantic and east Asian glacial climate could have amplified changes in the northern polar cell to larger scales. We further find evidence for an early onset of a Younger Dryas-like event in continental Asia, which gives evidence for heterogeneous climate change within east Asia during the last deglaciation.
Latitude: 75.100000 * Longitude: -42.320000
Date/Time Start: 1996-07-01T00:00:00 * Date/Time End: 1996-07-01T00:00:00
Minimum DEPTH, ice/snow: 1404.98 m * Maximum DEPTH, ice/snow: 2930.12 m
NGRIP (NorthGRIP) * Latitude: 75.100000 * Longitude: -42.320000 * Date/Time: 1996-07-01T00:00:00 * Elevation: 2917.0 m * Location: Greenland * Campaign: NGRIP * Basis: Sampling/drilling ice * Method/Device: Ice drill (ICEDRILL)
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DEPTH, ice/snowDepth ice/snowmGeocode
2Depth, top/minDepth topmRuth, Urs
3Depth, bottom/maxDepth botmRuth, Urs
4Age modelAge modelkaRuth, UrsAge model, SS09seaAge given at top of averaging interval
5Age model, optionalAge model optkaRuth, UrsAge model, GICC05GICC05 until 41.8 kyr BP; beyond 41.8 kyr BP extended using SS09sea shifted by 310 years to younger ages in order to smoothly continue GICC05; Age given at top of averaging interval
6Dust concentrationDust concµg/kgRuth, UrsLaser particle counter, KLOTZwater-insoluble particles
7Calcium, relativeCa relRuth, UrsCalculatedCa rel = [Ca2+]/[dust conc] (ppb/ppb); [Ca2+] measured by CFA
16552 data points

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