Sarah Shackleton
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View article: 81Kr dating of 1 kg Antarctic ice
81Kr dating of 1 kg Antarctic ice Open
Recovering earth's climate history from ice cores requires reliable dating of the ice. 81Kr is ideal for radiometric dating up to more than one million years, but the isotope is so rare that it has long been a challenge to apply 81Kr datin…
View article: AMOC Modulates Ocean Heat Content During Deglaciations
AMOC Modulates Ocean Heat Content During Deglaciations Open
During deglaciations, Earth takes up vast amounts of energy, about half of which heats the global ocean. Thus, ocean heat content (OHC) is a key metric to assess Earth's energy budget. Recent modeling studies suggest that OHC changes not o…
View article: Novel insights into the microstructure and crystal-preferred orientation of million-year-old Allan Hills ice
Novel insights into the microstructure and crystal-preferred orientation of million-year-old Allan Hills ice Open
Ice cores from the Allan Hills (AH) Blue Ice Area, Antarctica, are up to 6 million years of age, providing novel snapshots in time reaching back into the Miocene. However, AH ice core records are often discontinuous, probably caused by a c…
View article: 81Kr dating of 1 kg polar ice
81Kr dating of 1 kg polar ice Open
81Kr (t1/2=229 ka) is a valuable isotope for radiometric dating of water and ice with a dating range from thirty thousand to over one million years. It is produced by cosmic rays in the stratosphere, and uniformly distributed in the atmosp…
View article: Global ocean heat content over the past 3 million years
Global ocean heat content over the past 3 million years Open
The Pleistocene Epoch is characterized by global cooling and an increase in the intensity and duration of glacial cycles. Regional surface and subsurface ocean temperature records follow distinct trends over this interval, suggesting dynam…
View article: Three-dimensional multitrack electrical conductivity method for interpretation of complex ice core stratigraphy
Three-dimensional multitrack electrical conductivity method for interpretation of complex ice core stratigraphy Open
Recent ice cores from the Allan Hills, a blue ice area in Antarctica, are nearly 3 million years old. These cores extend ice core chronologies, enabling new insight into key climate periods such as the Mid-Pleistocene Transition. The inter…
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: Three-Dimensional Multitrack Electrical Conductivity Method for Interpretation of Complex Ice Core Stratigraphy
Three-Dimensional Multitrack Electrical Conductivity Method for Interpretation of Complex Ice Core Stratigraphy Open
Recent ice cores from the Allan Hills, a blue ice area in Antarctica, are nearly 3 million years old. These cores extend ice core chronologies, enabling new insight into key climate periods such as the Mid-Pleistocene Transition. The inter…
View article: Global Ocean Cooling of 2.3°C During the Last Glacial Maximum
Global Ocean Cooling of 2.3°C During the Last Glacial Maximum Open
Quantitative constraints on past mean ocean temperature (MOT) critically inform our historical understanding of Earth's energy balance. A recently developed MOT proxy based on paleoatmospheric Xe, Kr, and N 2 ratios in ice core air bubbles…
View article: Early-Mid Pleistocene ice core records of Antarctic and global cooling 
Early-Mid Pleistocene ice core records of Antarctic and global cooling  Open
Here we present water isotope and noble gas data from the Allan Hills, Antarctica, which provide insight into the local and global climate extending through the Mid Pleistocene Transition and beyond. The Allan Hills blue ice archive provid…
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: A whole ocean thermometer from atmospheric noble gas ratios
A whole ocean thermometer from atmospheric noble gas ratios Open
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View article: Benthic d18O records Earth's energy imbalance
Benthic d18O records Earth's energy imbalance Open
Data include previously published data that were used to produce reconstructions of global energy anomalies and Earth's energy imbalance, as well as the aforementioned reconstructions. Previously published data include 1) a global reconstr…
View article: Benthic d18O records Earth's energy imbalance
Benthic d18O records Earth's energy imbalance Open
Data include previously published data that were used to produce reconstructions of global energy anomalies and Earth's energy imbalance, as well as the aforementioned reconstructions. Previously published data include 1) a global reconstr…
View article: The new Kr-86 excess ice core proxy for synoptic activity: West Antarctic storminess possibly linked to Intertropical Convergence Zone (ITCZ) movement through the last deglaciation
The new Kr-86 excess ice core proxy for synoptic activity: West Antarctic storminess possibly linked to Intertropical Convergence Zone (ITCZ) movement through the last deglaciation Open
Here we present a newly developed ice core gas-phase proxy that directly samples a component of the large-scale atmospheric circulation: synoptic-scale pressure variability. Surface pressure changes weakly disrupt gravitational isotopic se…
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: Comment on cp-2022-65
Comment on cp-2022-65 Open
Abstract. Here we present a newly developed ice core gas-phase proxy that directly samples a component of the large-scale atmospheric circulation: synoptic-scale pressure variability. Surface pressure changes weakly disrupt gravitational i…
View article: Comment on cp-2022-65
Comment on cp-2022-65 Open
Abstract. Here we present a newly developed ice core gas-phase proxy that directly samples a component of the large-scale atmospheric circulation: synoptic-scale pressure variability. Surface pressure changes weakly disrupt gravitational i…
View article: Comment on cp-2022-65
Comment on cp-2022-65 Open
Here we present a newly developed ice core gas-phase proxy that directly samples a component of the large-scale atmospheric circulation: synoptic-scale pressure variability. Surface pressure variability weakly disrupts gravitational isotop…
View article: The new Kr-86 excess ice core proxy for synoptic activity: West Antarctic storminess possibly linked to ITCZ movement through the last deglaciation
The new Kr-86 excess ice core proxy for synoptic activity: West Antarctic storminess possibly linked to ITCZ movement through the last deglaciation Open
Here we present a newly developed ice core gas-phase proxy that directly samples a component of the large-scale atmospheric circulation: synoptic-scale pressure variability. Surface pressure variability weakly disrupts gravitational isotop…
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: New noble gas isotope tracers for groundwater hydrology
New noble gas isotope tracers for groundwater hydrology Open
Dissolved noble gases in groundwater are useful tracers of processes and properties related to groundwater recharge and flow.For decades, measurements of the elemental abundances of He, Ne, Ar, Kr, and Xe and the 3 He/ 4 He ratio have prov…
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: Reply on RC2
Reply on RC2 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: Reply on RC1
Reply on RC1 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: Reply on CC1
Reply on CC1 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: 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…