Property:QCnotes

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Pages using the property "QCnotes"

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Arc 008.trsgi +	Elevation estimated from GoogleEarth; rounded to 100 m  +
Arc 011.d18O +	QC wait for VMD  +
Arc 012.temperature +	MXD record replaces the TRW; duplicate record omited from EuroMed  +
Arc 012mxd.temperature1 +	MXD record replaces the TRW; duplicate record omited from EuroMed  +
Arc 016.trsgi +	No low frequency;updated detrending in DArrigo et al. (2006) but data not available. Likely divergence issues but the only existing record from northeastern Siberia so it must be used to increase coverage.(FCL)  +
Arc 021.thickness +	Based on studies of glacier mass balance and glaciology in Iceland (e.g. Bjornsson; Flowers), 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. Previous comment: QC failed: article states "sediment flux to Hvítárvatn is dominantly controlled by the integrated rate of sediment production by erosion beneath Langjökull, modulated on annual to decadal timescales by the efficiency of the subglacial fluvial sediment delivery system.", variability function of proximity, absolute values function of sediment availability. This is _not_ temperature!; QQ by PF not passed  +
Arc 023.trsgi +	QC under question. Very weak correlation to temperature and not well described in the literature (FCL)  +
Arc 024.thickness +	Valid only for > 3yr time scales  +
Arc 025.X radiograph dark layer +	Time series truncated at 1800 CE. Actual measurement is not the thickness of the organic-rich layer as stated in orignial data citation. Instead, a measure of organic content within a year is estimated by the cumulative sum of the dark component of pixels of radiographs for each varve\  +
Arc 026.d18O +	Low frequency  +
Arc 032.d18O +	Low frequency  +
Arc 033.d18O +	Low frequency  +
Arc 034.d18O +	Low frequency  +
Arc 036.temperature +	multi-decadal MAT, 50-year or so averages of exactly dated historical documentary information. A hiatus in the 15th and part of the 16th centuries (FCL)  +
Arc 040.temperature +	Mind dating uncertainty  +
Arc 043.d18O +	Fisher et al report episodic scouring of winter snow, some random warm bias in the isotopic signal  +
Arc 044.d18O +	Fisher et al report episodic scouring of winter snow, some random warm bias in the isotopic signal  +
Arc 045.temperature +	A newer, higher-resolution record has been published by Jiang et al. (2015, Geology: doi:10.1130/G36377.1; data at: http://www.ncdc.noaa.gov/paleo/study/17635)  +
Arc 053.temperature +	QC under question, negative correlation to local temperature (FCL), should be negative accoriding to NickMcKay, keep it.  +
Arc 057.density +	Δdensity = MXD - minimum density, more focused summer temp. signal than MXD (Björklund et al., 2014, CP, doi:10.5194/cp-10-877-2014)  +