Vinther, B. M.;Clausen, H. B.;Fisher, D. A.;Koerner, R. M.;Johnsen, S. J.;Andersen, K. K.;Dahl-Jensen, D.;Rasmussen, S. O.;Steffensen, J. P.;Svensson, A. M.

Synchronizing ice cores from the Renland and Agassiz ice caps to the Greenland ice core chronology

; archiveType changed - was originally ice core

Isaksson, E.;Divine, D.;Kohler, J.;Martma, T.;Pohjola, V.;Motoyama, H.;Watanabe, O.

Geografiska Annaler, Series A: Physical Geography

Climate oscillations as recorded in Svalbard ice core d18O records between AD 1200 and 1997

Dansgaard, W.;Johnsen, S. J.;Moller, J.;Langway, C. C.

American Association for the Advancement of Science (AAAS)

One thousand centuries of climatic record from Camp Century on the Greenland Ice Sheet

Vinther, B.M.;Jones, P.D.;Briffa, K.R.;Clausen, H.B.;Andersen, K.K.;Dahl-Jensen, D.;Johnsen, S.J.

Climatic signals in multiple highly resolved stable isotope records from Greenland

Fisher, D. A.;Koerner, R. M.;Paterson, W. S. B.;Dansgaard, W.;Gundestrup, N.;Reeh, N.

Effect of wind scouring on climatic records from ice-core oxygen-isotope profiles

Fisher et al report episodic scouring of winter snow, some random warm bias in the isotopic signal

Oxygen 18/16 variability in Greenland snow and ice with $10^3$ to $10^5$ year time resolution

Larsen, Darren J.;Miller, Gifford H.;Geirsdóttir, Áslaug;Thordarson, Thorvaldur

A 3000-year varved record of glacier activity and climate change from the proglacial lake Hvítárvatn, Iceland

this lake-sediment-accumulation record likely reflects summer temperature changes on multi-decadal and longer  timescales. It should not be used to infer inter-annual variability, which is controlled by subglacial fluvial processes.

based on studies of glacier mass balance and glaciology in Iceland (e.g. Bjornsson; Flowers), I would agree that Icelandic glacier fluctuations are dominantly controlled by changes in melt season temperature. Glacier fluctuations influence the production and transport of eroded material and the eventual deposition of this sediment in a downstream basin (i.e. a proglacial lake). ... On short timescales (seasonal, annual, inter-annual), changes in sediment accumulation can be driven by many factors and we can all agree that identifying individual controls is messy. But on longer timescales (for example, centennial timescales, ... I would argue strongly that changes in sediment accumulation are driven by changes in glacier size. This is laid out in Larsen et al., 2011 QSR. We subsequently expanded on this initial study to: 1) include the whole Holocene (Larsen et al., 2012 QSR attached, which demonstrates a clear "8.2ka-event" signal and subsequent Neoglacial onset), and 2) by measuring varve thickness in multiple cores along a lake transect and tying the core data to seismic stratigraphy (Larsen et al. 2013 EPSL attached). This latter work demonstrates that the trends in sediment accumulation are consistent and observed throughout the lake basin. Given the available data, I feel comfortable summarizing as follows: Icelandic glacier fluctuations are dominantly controlled by summer temperature. On longer timescales, fluctuations of the Langjokull ice cap can be reconstructed from changes in mean varve thickness at glacial lake 'Hvitarvatn. with instrumental record'