Using ice core measurements from Taylor Glacier, Antarctica, to calibrate in situ cosmogenic 14C production rates by muons
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Using ice core measurements from Taylor Glacier, Antarctica, to calibrate in situ cosmogenic 14C production rates by muons. / Dyonisius, Michael N.; Petrenko, Vasilii V.; Smith, Andrew M.; Hmiel, Benjamin; Neff, Peter D.; Yang, Bin; Hua, Quan; Schmitt, Jochen; Shackleton, Sarah A.; Buizert, Christo; Place, Philip F.; Menking, James A.; Beaudette, Ross; Harth, Christina; Kalk, Michael; Roop, Heidi A.; Bereiter, Bernhard; Armanetti, Casey; Vimont, Isaac; Englund Michel, Sylvia; Brook, Edward J.; Severinghaus, Jeffrey P.; Weiss, Ray F.; McConnell, Joseph R.
In: Cryosphere, Vol. 17, No. 2, 20.02.2023, p. 843-863.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Using ice core measurements from Taylor Glacier, Antarctica, to calibrate in situ cosmogenic 14C production rates by muons
AU - Dyonisius, Michael N.
AU - Petrenko, Vasilii V.
AU - Smith, Andrew M.
AU - Hmiel, Benjamin
AU - Neff, Peter D.
AU - Yang, Bin
AU - Hua, Quan
AU - Schmitt, Jochen
AU - Shackleton, Sarah A.
AU - Buizert, Christo
AU - Place, Philip F.
AU - Menking, James A.
AU - Beaudette, Ross
AU - Harth, Christina
AU - Kalk, Michael
AU - Roop, Heidi A.
AU - Bereiter, Bernhard
AU - Armanetti, Casey
AU - Vimont, Isaac
AU - Englund Michel, Sylvia
AU - Brook, Edward J.
AU - Severinghaus, Jeffrey P.
AU - Weiss, Ray F.
AU - McConnell, Joseph R.
PY - 2023/2/20
Y1 - 2023/2/20
N2 - Cosmic rays entering the Earth's atmosphere produce showers of secondary particles such as protons, neutrons, and muons. The interaction of these particles with oxygen-16 (O-16) in minerals such as ice and quartz can produce carbon-14 (C-14). In glacial ice, C-14 is also incorporated through trapping of C-14-containing atmospheric gases ((CO2)-C-14,(CO)-C- 14, and (CH4)-C-14). Understanding the production rates of in situ cosmogenic C-14 is important to deconvolve the in situ cosmogenic and atmospheric( 14)C signals in ice, both of which contain valuable paleoenvironmental information. Unfortunately, the in situ C-14 production rates by muons (which are the dominant production mechanism at depths of > 6 m solid ice equivalent) are uncertain. In this study, we use measurements of in situ C-14 in ancient ice (> 50 ka) from the Taylor Glacier, an ablation site in Antarctica, in combination with a 2D ice flow model to better constrain the compound-specific rates of C-14 production by muons and the partitioning of in situ( 14)C between CO2, CO, and CH4. Our measurements show that 33.7 % (+/- 11.4%; 95 % confidence interval) of the produced cosmogenic C-14 forms (CO)-C-14 and 66.1 % (+/- 11.5%; 95 % confidence interval) of the produced cosmogenic C-14 forms (CO2)-C-14. (CH4)-C-14 represents a very small fraction (< 0.3%) of the total. Assuming that the majority of in situ muogenic 14C in ice forms (CO2)-C-14, (CO)-C-14, and (CH4)-C-14, we also calculated muogenic( 14)C production rates that are lower by factors of 5.7 (3.6-13.9; 95 % confidence interval) and 3.7 (2.0-11.9; 95 % confidence interval) for negative muon capture and fast muon interactions, respectively, when compared to values determined in quartz from laboratory studies (Heisinger et al., 2002a, b) and in a natural setting (Lupker et al., 2015). This apparent discrepancy in muogenic C-14 production rates in ice and quartz currently lacks a good explanation and requires further investigation.
AB - Cosmic rays entering the Earth's atmosphere produce showers of secondary particles such as protons, neutrons, and muons. The interaction of these particles with oxygen-16 (O-16) in minerals such as ice and quartz can produce carbon-14 (C-14). In glacial ice, C-14 is also incorporated through trapping of C-14-containing atmospheric gases ((CO2)-C-14,(CO)-C- 14, and (CH4)-C-14). Understanding the production rates of in situ cosmogenic C-14 is important to deconvolve the in situ cosmogenic and atmospheric( 14)C signals in ice, both of which contain valuable paleoenvironmental information. Unfortunately, the in situ C-14 production rates by muons (which are the dominant production mechanism at depths of > 6 m solid ice equivalent) are uncertain. In this study, we use measurements of in situ C-14 in ancient ice (> 50 ka) from the Taylor Glacier, an ablation site in Antarctica, in combination with a 2D ice flow model to better constrain the compound-specific rates of C-14 production by muons and the partitioning of in situ( 14)C between CO2, CO, and CH4. Our measurements show that 33.7 % (+/- 11.4%; 95 % confidence interval) of the produced cosmogenic C-14 forms (CO)-C-14 and 66.1 % (+/- 11.5%; 95 % confidence interval) of the produced cosmogenic C-14 forms (CO2)-C-14. (CH4)-C-14 represents a very small fraction (< 0.3%) of the total. Assuming that the majority of in situ muogenic 14C in ice forms (CO2)-C-14, (CO)-C-14, and (CH4)-C-14, we also calculated muogenic( 14)C production rates that are lower by factors of 5.7 (3.6-13.9; 95 % confidence interval) and 3.7 (2.0-11.9; 95 % confidence interval) for negative muon capture and fast muon interactions, respectively, when compared to values determined in quartz from laboratory studies (Heisinger et al., 2002a, b) and in a natural setting (Lupker et al., 2015). This apparent discrepancy in muogenic C-14 production rates in ice and quartz currently lacks a good explanation and requires further investigation.
KW - POLAR ICE
KW - CARBON-DIOXIDE
KW - DOME ICE
KW - CLIMATE HISTORY
KW - ATMOSPHERIC CO2
KW - DRY EXTRACTION
KW - ANCIENT ICE
KW - RADIOCARBON
KW - (CO)-C-14
KW - HOLOCENE
U2 - 10.5194/tc-17-843-2023
DO - 10.5194/tc-17-843-2023
M3 - Journal article
VL - 17
SP - 843
EP - 863
JO - The Cryosphere
JF - The Cryosphere
SN - 1994-0416
IS - 2
ER -
ID: 341014977