Michael Kalk
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View article: Ice cores from the Allan Hills, Antarctica show relatively stable atmospheric CO2 and CH4 levels over the last 3 million years
Ice cores from the Allan Hills, Antarctica show relatively stable atmospheric CO2 and CH4 levels over the last 3 million years Open
The role greenhouse gases play in the evolution of Earth's climate over the last 3 million years is uncertain beyond the continuous ice core record (800,000 years). Here, we present new snapshots of carbon dioxide (CO2) and methane (CH4) b…
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: Southern Ocean drives multidecadal atmospheric CO <sub>2</sub> rise during Heinrich Stadials
Southern Ocean drives multidecadal atmospheric CO <sub>2</sub> rise during Heinrich Stadials Open
The last glacial period was punctuated by cold intervals in the North Atlantic region that culminated in extensive iceberg discharge events. These cold intervals, known as Heinrich Stadials, are associated with abrupt climate shifts worldw…
View article: Late Pliocene and Early Pleistocene CO2 and CH4 from ice cores from the Allan Hills, Antarctica
Late Pliocene and Early Pleistocene CO2 and CH4 from ice cores from the Allan Hills, Antarctica Open
Currently, chronologically discontinuous ice cores from the Allan Hills Blue Ice Area (BIA), Antarctica, are our only direct insight into the atmospheric composition of periods beyond the continuous ice core record (800 ka BP). An accurate…
View article: Reconciling ice core CO2 and land-use change following New World-Old World contact
Reconciling ice core CO2 and land-use change following New World-Old World contact Open
Ice core records of carbon dioxide (CO2) over the last 2000 years are critical to our understanding of global carbon cycle dynamics on centennial and multidecadal timescales. They also provide context for the unprecedented anthropogenic ri…
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: 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: Reconciling ice core CO2 and land-use change following New World-Old World contact
Reconciling ice core CO2 and land-use change following New World-Old World contact Open
Ice core records of carbon dioxide (CO 2 ) throughout the last 2000 years provide context for the unprecedented anthropogenic rise in atmospheric CO 2 and insights into global carbon cycle dynamics on centennial and multidecadal timescales…
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: 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
The SP19 chronology for the South Pole Ice Core – Part 2: gas chronology, Δage, and smoothing of atmospheric records Open
A new ice core drilled at the South Pole provides a 54 000-year paleoenvironmental record including the composition of the past atmosphere. This paper describes the SP19 chronology for the South Pole atmospheric gas record and complements …
The SP19 chronology for the South Pole Ice Core - Part 2: gas chronology, Δage, and smoothing of atmospheric records Open
A new ice core drilled at the South Pole provides a 54 000-year paleoenvironmental record including the composition of the past atmosphere. This paper describes the SP19 chronology for the South Pole atmospheric gas record and complements …
Old carbon reservoirs were not important in the deglacial methane budget Open
Small burden from old sources Methane is a potent greenhouse gas with large natural sources, reservoirs, and sinks. Dyonisius et al. found that methane emissions from old, cold-region carbon reservoirs like permafrost and methane hydrates …