Auxiliary Material for

Radiocarbon Age-Offsets in an Arctic Lake Reveal the Long-Term Response of 
Permafrost Carbon to Climate Change

Benjamin V. Gaglioti (Water and Environmental Research Center, University of Alaska
Fairbanks, 306 Tanana Dr., Fairbanks, AK 99775, USA)
Daniel H. Mann (Geography Program, School of Natural Resources and Agricultural Science,
University of Alaska, 905 Koyukuk Dr., Fairbanks, AK 99775, USA)
Benjamin M. Jones (Alaska Science Center, US Geological Survey, 4210 University Dr., 
Anchorage, AK 99508, USA)
John W. Pohlman (Woods Hole Coastal and Marine Science Center, US Geological Survey,
384 Woods Hole Rd., Woods Hole, MA 02543, USA)
Michael L. Kunz (Geography Program, School of Natural Resources and Agricultural
Science, University of Alaska, 905 Koyukuk Dr., Fairbanks, AK 99775, USA)
Matthew J. Wooller (School of Fisheries and Ocean Sciences, University of Alaska 
Fairbanks, 306 Tanana Dr.  Fairbanks, AK 99775, USA)

Journal of Geophysical Research: Biogeosciences
Introduction
This dataset contains the radiocarbon results from sediment, plant macrofossils, 
and particulate organic carbon in streams in the area of Lake of the Pleistocene 
(LOP), Nikivlik Lake, and several small ponds in the former watershed of Lake of 
the Pleistocene Arctic Alaska. Samples were collected during summers of 2011 and 
2012. Conventional Accelerator Mass Spectrometry (described in the Methods Section)
results are in the table 1 “ts.01.pdf” and the ramped temperature radiocarbon results 
(described in the Methods Section) of different gas fractions evolving at varying
temperatures from sediment samples are found in Table 2 “ts.02.pdf”. 
1.	ts.01.pdf AMS 14C results from LOP watershed
1.1	Column “Lab Number” Lab identification number for radiocarbon samples. 
1.2	Column “Sample Name” Name of radiocarbon sample from field collection. 
1.3	Column “Dated Material” Type of sample that was dated. 
1.4	Column “δ13C (‰)” Stable carbon isotope values relative to VPDB standard. 
1.5	Column “δ13C Normalized Age” Radiocarbon age and error of sample calibrated with
 δ13C (‰).
1.6	Column “Lower 95% Limit” Lower age limit of calibrated range.
1.7	Column “Upper 95% Limit” Upper age limit of calibrated range. 
1.8	Column “μ age” Mean age of calibrated age range. 
2.	tx.02.pdf Ramped-Temperature AMS 14C results
2.1	Column “Lab Number” Lab identification number for radiocarbon sediment samples used 
for Ramped-Temperature radiocarbon analysis. 
2.2	Column “Sample Name” Name of radiocarbon sample from field collection. 
2.3	Column “Gas Number” Name of lab gas number for CO2 sample from a specific 
temperature window. 
2.4	Column “Collection Temperature (C)” The highest temperature the gas sample 
was collected at. 
2.5	Column “δ13C (‰)” Stable carbon isotope values relative to VPDB standard. 
2.6	Column “δ13C Normalized Age” Radiocarbon age and error of sample calibrated 
with δ13C (‰).
2.7	Column “Lower 95% Limit” Lower age limit of calibrated range.
2.8	Column “Upper 95% Limit” Upper age limit of calibrated range. 
2.9	Column “μ age” Mean age of calibrated age range.