Michael Dyonisius
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View article: Atmospheric Methane: Comparison Between Methane's Record in 2006–2022 and During Glacial Terminations
Atmospheric Methane: Comparison Between Methane's Record in 2006–2022 and During Glacial Terminations Open
Atmospheric methane's rapid growth from late 2006 is unprecedented in the observational record. Assessment of atmospheric methane data attributes a large fraction of this atmospheric growth to increased natural emissions over the tropics, …
View article: Combining traditional and novel techniques to increase our understanding of the lock-in depth of atmospheric gases in polar ice cores – results from the EastGRIP region
Combining traditional and novel techniques to increase our understanding of the lock-in depth of atmospheric gases in polar ice cores – results from the EastGRIP region Open
We investigate the lock-in zone (LIZ) of the East Greenland Ice Core Project (EastGRIP) region, northeastern Greenland, in detail. We present results from the firn air-pumping campaign of the S6 borehole, forward modeling, and a novel tech…
View article: The potential of in situ cosmogenic <sup>14</sup> CO in ice cores as a proxy for galactic cosmic ray flux variations
The potential of in situ cosmogenic <sup>14</sup> CO in ice cores as a proxy for galactic cosmic ray flux variations Open
Galactic cosmic rays (GCRs) interact with matter in the atmosphere and at the surface of the Earth to produce a range of cosmogenic nuclides. Measurements of cosmogenic nuclides produced in surface rocks have been used to study past land i…
View article: Characterization of in situ cosmogenic <sup>14</sup> CO production, retention and loss in firn and shallow ice at Summit, Greenland
Characterization of in situ cosmogenic <sup>14</sup> CO production, retention and loss in firn and shallow ice at Summit, Greenland Open
Measurements of carbon-14-containing carbon monoxide (14CO) in glacial ice are useful for studies of the past oxidative capacity of the atmosphere as well as for reconstructing the past cosmic ray flux. The 14CO abundance in glacial ice re…
View article: Comment on egusphere-2023-3126
Comment on egusphere-2023-3126 Open
Abstract. Galactic cosmic rays (GCRs) interact with matter in the atmosphere and at the surface of the Earth to produce a range of cosmogenic nuclides. Measurements of cosmogenic nuclides produced in surface rocks have been used to study p…
View article: The potential of in situ cosmogenic <sup>14</sup> CO in ice cores as a proxy for galactic cosmic ray flux variations
The potential of in situ cosmogenic <sup>14</sup> CO in ice cores as a proxy for galactic cosmic ray flux variations Open
Galactic cosmic rays (GCRs) interact with matter in the atmosphere and at the surface of the Earth to produce a range of cosmogenic nuclides. Measurements of cosmogenic nuclides produced in surface rocks have been used to study past land i…
View article: Comment on tc-2023-121
Comment on tc-2023-121 Open
Abstract. Measurements of carbon-14-containing carbon monoxide (14CO) in glacial ice are useful for studies of the past oxidative capacity of the atmosphere as well as for reconstructing the past cosmic ray flux. 14CO abundance in glacial …
View article: Comment on egusphere-2023-1904
Comment on egusphere-2023-1904 Open
Abstract. We investigate the lock-in zone (LIZ) of the EastGRIP region, Northeast Greenland, in detail. We present results from the firn air pumping campaign of the S6 borehole, forward modeling, and a novel technique for finding the lock-…
View article: Combining traditional and novel techniques to increase our understanding of the lock-in depth of atmospheric gases in polar ice cores - results from the EastGRIP region
Combining traditional and novel techniques to increase our understanding of the lock-in depth of atmospheric gases in polar ice cores - results from the EastGRIP region Open
We investigate the lock-in zone (LIZ) of the EastGRIP region, Northeast Greenland, in detail. We present results from the firn air pumping campaign of the S6 borehole, forward modeling, and a novel technique for finding the lock-in depth (…
View article: Characterization of in situ cosmogenic <sup>14</sup> CO production, retention and loss in firn and shallow ice at Summit, Greenland
Characterization of in situ cosmogenic <sup>14</sup> CO production, retention and loss in firn and shallow ice at Summit, Greenland Open
Measurements of carbon-14-containing carbon monoxide (14CO) in glacial ice are useful for studies of the past oxidative capacity of the atmosphere as well as for reconstructing the past cosmic ray flux. 14CO abundance in glacial ice repres…
View article: Supplementary material to "Characterization of in situ cosmogenic <sup>14</sup> CO production, retention and loss in firn and shallow ice at Summit, Greenland"
Supplementary material to "Characterization of in situ cosmogenic <sup>14</sup> CO production, retention and loss in firn and shallow ice at Summit, Greenland" Open
Supplement for "Characterization of in situ cosmogenic 14 CO production, retention and loss in firn and shallow ice at Summit, Greenland" by Hmiel et al.Table S1: Measurements and associated corrections for Summit 2013 firn air samples.5Al…
View article: Panarctic lakes exerted a small positive feedback on early Holocene warming due to deglacial release of methane
Panarctic lakes exerted a small positive feedback on early Holocene warming due to deglacial release of methane Open
Climate-driven permafrost thaw can release ancient carbon to the atmosphere, begetting further warming in a positive feedback loop. Polar ice core data and young radiocarbon ages of dissolved methane in thermokarst lakes have challenged th…
View article: Atmospheric Methane: Comparison Between Methane's Record in 2006–2022 and During Glacial Terminations
Atmospheric Methane: Comparison Between Methane's Record in 2006–2022 and During Glacial Terminations Open
Atmospheric methane's rapid growth from late 2006 is unprecedented in the observational record. Assessment of atmospheric methane data attributes a large fraction of this atmospheric growth to increased natural emissions over the tropics, …
View article: Using ice core measurements from Taylor Glacier, Antarctica, to calibrate in situ cosmogenic <sup>14</sup> C production rates by muons
Using ice core measurements from Taylor Glacier, Antarctica, to calibrate in situ cosmogenic <sup>14</sup> C production rates by muons Open
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 (16O) in minerals such as ice and quartz can produce carbon-14 (14C)…
View article: Reply on RC2
Reply on RC2 Open
Abstract. Cosmic rays entering the Earth’s atmosphere produce showers of secondary particles such as neutrons and muons. The interaction of these neutrons and muons with oxygen-16 (16O) in minerals such as ice and quartz can produce carbon…
View article: Subglacial methane cycling under the Greenland Ice Sheet&#160;
Subglacial methane cycling under the Greenland Ice Sheet  Open
<p>Glaciers and ice sheets cover around 10% of the Earth&#8217;s surface and the Greenland Ice Sheet (GrIS) is the largest ice mass in the Northern hemisphere, but is melting at an increasing rate, losing ~400 km<sup>3</…
View article: &#8203;Development of ice sublimation device for analyses of methane isotopes in ice with high impurities
​Development of ice sublimation device for analyses of methane isotopes in ice with high impurities Open
<p>Common methods to liberate the air bubbles trapped in ice cores include melting (wet extraction) and mechanical destruction (dry extraction) of ice under vacuum. Wet extraction is commonly used for CH<sub>4</sub> analy…
View article: Using ice core measurements from Taylor Glacier, Antarctica to calibrate in situ cosmogenic <sup>14</sup> C production rates by muons
Using ice core measurements from Taylor Glacier, Antarctica to calibrate in situ cosmogenic <sup>14</sup> C production rates by muons Open
Cosmic rays entering the Earth’s atmosphere produce showers of secondary particles such as neutrons and muons. The interaction of these neutrons and muons with oxygen-16 (16O) in minerals such as ice and quartz can produce carbon-14 (14C).…
View article: Supplementary material to "Using ice core measurements from Taylor Glacier, Antarctica to calibrate in situ cosmogenic <sup>14</sup> C production rates by muons"
Supplementary material to "Using ice core measurements from Taylor Glacier, Antarctica to calibrate in situ cosmogenic <sup>14</sup> C production rates by muons" Open
Average field ± stdev 29.7 ± 4.6 Average lab ± stdev 21.4 ± 3.7 Average postcoring ± stdev 8.2 ± 5.9
View article: Evolution of mean ocean temperature in Marine Isotope Stage 4
Evolution of mean ocean temperature in Marine Isotope Stage 4 Open
Deglaciations are characterized by relatively fast and near-synchronous changes in ice sheet volume, ocean temperature, and atmospheric greenhouse gas concentrations, but glacial inception occurs more gradually. Understanding the evolution…
View article: Comment on cp-2021-8
Comment on cp-2021-8 Open
Abstract. Deglaciations are characterized by relatively fast and near-synchronous changes in ice sheet volume, ocean temperature, and atmospheric greenhouse gas concentrations, but glacial inception occurs more gradually. Understanding the…
View article: Evolution of mean ocean temperature in Marine Isotope Stages 5-4
Evolution of mean ocean temperature in Marine Isotope Stages 5-4 Open
Deglaciations are characterized by relatively fast and near-synchronous changes in ice sheet volume, ocean temperature, and atmospheric greenhouse gas concentrations, but glacial inceptions occur more gradually. Understanding the evolution…
View article: Obtaining a History of the Flux of Cosmic Rays using In Situ Cosmogenic $^{14}$C Trapped in Polar Ice
Obtaining a History of the Flux of Cosmic Rays using In Situ Cosmogenic $^{14}$C Trapped in Polar Ice Open
Carbon-14 ($^{14}$C) is produced in the atmosphere when neutrons from cosmic-ray air showers are captured by $^{14}$N nuclei. Atmospheric $^{14}$C becomes trapped in air bubbles in polar ice as compacted snow (firn) transforms into ice. $^…
View article: Obtaining a History of the Flux of Cosmic Rays using In Situ Cosmogenic $^{14}C$ Trapped in Polar Ice
Obtaining a History of the Flux of Cosmic Rays using In Situ Cosmogenic $^{14}C$ Trapped in Polar Ice Open
Carbon-14 is produced in the atmosphere when neutrons from cosmic-ray air showers are captured by nitrogen nuclei. Atmospheric carbon-14 becomes trapped in air bubbles in polar ice as compacted snow (firn) transforms into ice. Carbon-14 is…
View article: Spatial pattern of accumulation at Taylor Dome during Marine Isotope Stage 4: stratigraphic constraints from Taylor Glacier
Spatial pattern of accumulation at Taylor Dome during Marine Isotope Stage 4: stratigraphic constraints from Taylor Glacier Open
New ice cores retrieved from the Taylor Glacier (Antarctica) blue ice area contain ice and air spanning the Marine Isotope Stage (MIS) 5–4 transition, a period of global cooling and ice sheet expansion. We determine chronologies for the ic…
View article: Spatial pattern of accumulation at Taylor Dome during the last glacialinception: stratigraphic constraints from Taylor Glacier
Spatial pattern of accumulation at Taylor Dome during the last glacialinception: stratigraphic constraints from Taylor Glacier Open
A new ice core retrieved from the Taylor Glacier blue ice area contains ice and air spanning the Marine Isotope Stage (MIS) 5/4 transition (74 to 65 ka), a period of global cooling and glacial inception. Dating the ice and air bubbles in t…