Auxiliary material for this article contains a detailed description of the climate model used in this article, including both the 1000 AD control run, and the perturbed transient simulation, six figures, and four tables.

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grl28820-sup-0001-readme.txtplain text document7Kreadme.txt
grl28820-sup-0002-txts01.pdfPDF document69KText S1. Description of the climate model.
grl28820-sup-0003-fs01.pdfPDF document2636KFigure S1. Landscape of in situ ice-killed vegetation, site M10-B067v, northern Baffin Island, Arctic Canada.
grl28820-sup-0004-fs02.pdfPDF document2056KFigure S2. The 14C inventory of a single strand of the living clump of Polytrichum moss shown in the photo collected from central Baffin Island in 2009 AD was measured to have a D14C of 51 ± 2.
grl28820-sup-0005-fs03.pdfPDF document344KFigure S3. Probability density functions more accurately describe the variance in the calendar age solution when calibrating conventional 14C ages than do median age and standard deviations.
grl28820-sup-0006-fs04.pdfPDF document369KFigure S4. Evolution of albedo for the polar region averaged over Apr, May, Jun, Jul, Aug, Sept in our transient simulation relative to the 1000 AD control, and the spatial albedo anomaly pattern 1300-1600 AD.
grl28820-sup-0007-fs05.pdfPDF document152KFigure S5. Spatial pattern of average surface air temperature anomalies averaged for May, Jun, Jul, Aug for 1300-1600 AD relative to the 1000 AD control run.
grl28820-sup-0008-fs06.pdfPDF document193KFigure S6. SST and SSS anomalies for 1300-1600 AD relative to the mean of the 1000 AD control run.
grl28820-sup-0009-ts01.pdfPDF document32KTable S1. Three different individual strands from a single clump of Polytrichum moss exposed in the year of its collection by a receding ice-cap margin produced statistically identical conventional radiocarbon ages.
grl28820-sup-0010-ts02.pdfPDF document65KTable S2. Details of all radiocarbon dated sample sites.
grl28820-sup-0011-ts03.xlsExcel spreadsheet171KTable S3. Calibration details for radiocarbon dates used in Figure 2c.
grl28820-sup-0012-ts04.pdfPDF document40KTable S4. Identification of the sites that provide the majority of the signal to the intervals in the Composite PDF.

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