Edward J. Brook
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View article: In situ production of hybrid N <sub>2</sub> O in dust-rich Antarctic ice
In situ production of hybrid N <sub>2</sub> O in dust-rich Antarctic ice Open
Nitrous oxide (N2O) is a potent greenhouse gas involved in the destruction of stratospheric ozone. Past atmospheric mixing ratios of N2O are archived in ice cores; however, the presence of in situ N2O production in dust-rich Antarctic ice …
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: Glacial‐Interglacial and Millennial‐Scale Changes in Nitrous Oxide Emissions Pathways and Source Regions
Glacial‐Interglacial and Millennial‐Scale Changes in Nitrous Oxide Emissions Pathways and Source Regions Open
During the transition from the Last Glacial Maximum (LGM) to the Holocene, the atmospheric N 2 O mole fraction increased by 80 nmol mol −1 . Using ice core measurements of N 2 O isotopomer ratios, we show that this increase was driven by i…
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: Towards understanding the N2O production in dust-rich Antarctic ice using bulk and position-specific isotope analysis
Towards understanding the N2O production in dust-rich Antarctic ice using bulk and position-specific isotope analysis Open
Nitrous oxide (N2O) is a potent greenhouse gas also involved in the destruction of stratospheric ozone. Unlike carbon dioxide (CO2) and methane (CH4), there is no continuous record of past atmospheric concentrations of N2O from ice cores o…
View article: Deciphering the cause of greenhouse gas (CO2, CH4) alteration in shallow ice at Larsen blue-ice area, East Antarctica
Deciphering the cause of greenhouse gas (CO2, CH4) alteration in shallow ice at Larsen blue-ice area, East Antarctica Open
Ice cores drilled from polar ice sheets in Antarctica and Greenland contain ancient atmospheric air trapped in air bubbles. The reconstruction of past atmospheric greenhouse gas (GHG) concentrations, such as carbon dioxide (CO2) and methan…
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: Re-assessment of methane cycle dynamics from the preindustrial to present-day&#160;
Re-assessment of methane cycle dynamics from the preindustrial to present-day  Open
Ice core reconstructions of atmospheric methane (CH4) and its stable carbon isotope ratio (δ13CH4) provide important constraints for understanding the links between human activity, methane and climate. However, uncertainties in existi…
View article: Hyperspectral imaging system for ice core studies
Hyperspectral imaging system for ice core studies Open
Hyperspectral imaging (HSI) technology has been increasingly used in Earth and planetary sciences. This imaging technique has been successfully tested on ice cores using VNIR (visible and near-infrared, 380-1000 nm) (Garzonio et al., 2018)…
View article: Development of a Continuous Flow Analysis system for studying Allan Hills, Antarctica ice cores
Development of a Continuous Flow Analysis system for studying Allan Hills, Antarctica ice cores Open
Extending ice core records beyond 800 thousand years (kyr) is a pivotal goal in paleoclimate research. Allan Hills, East Antarctica, provides a unique opportunity to evaluate old ice and reconstruct climate well beyond 800 kyr with prelimi…
View article: Comprehensive multi frequency airborne mapping of the southern flank of Dome A: results of the COLDEX airborne program.
Comprehensive multi frequency airborne mapping of the southern flank of Dome A: results of the COLDEX airborne program. Open
The Center for Oldest Ice Exploration (COLDEX) is a US initiative funded to search for climate records over the last 5 million years, including locating sites for an accessible continuous ice core going back 1.5 million years.  A…
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: Investigating the dust-induced N2O production in ice cores using bulk and position-specific isotope analysis
Investigating the dust-induced N2O production in ice cores using bulk and position-specific isotope analysis Open
Ice cores represent the only direct paleo-atmospheric archive that allow the reconstruction of greenhouse gas concentrations such as N2O. However, processes in the ice can alter the atmospheric information stored in air bubbles, for exampl…
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: Southern Hemisphere atmospheric history of carbon monoxide over the late Holocene reconstructed from multiple Antarctic ice archives
Southern Hemisphere atmospheric history of carbon monoxide over the late Holocene reconstructed from multiple Antarctic ice archives Open
Carbon monoxide (CO) is a naturally occurring atmospheric trace gas, a regulated pollutant, and one of the main components determining the oxidative capacity of the atmosphere. Evaluating climate–chemistry models under different conditions…
View article: Millennial and orbital-scale variability in a 54 000-year record of total air content from the South Pole ice core
Millennial and orbital-scale variability in a 54 000-year record of total air content from the South Pole ice core Open
The total air content (TAC) of polar ice cores has long been considered a potential proxy for past ice sheet elevation. Recent work, however, has shown that a variety of other factors also influence this parameter. In this paper we present…
View article: Antarctic evidence for an abrupt northward shift of the Southern Hemisphere westerlies at 32 ka BP
Antarctic evidence for an abrupt northward shift of the Southern Hemisphere westerlies at 32 ka BP Open
High-resolution ice core records from coastal Antarctica are particularly useful to inform our understanding of environmental changes and their drivers. Here, we present a decadally resolved record of sea-salt sodium (a proxy for open-ocea…
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: Methane, ethane, and propane production in Greenland ice core samples and a first isotopic characterization of excess methane
Methane, ethane, and propane production in Greenland ice core samples and a first isotopic characterization of excess methane Open
Air trapped in polar ice provides unique records of the past atmospheric composition ranging from key greenhouse gases such as methane (CH4) to short-lived trace gases like ethane (C2H6) and propane (C3H8). Recently, the comparison of CH4 …
View article: Millennial and orbital-scale variability in a 54,000-year record of total air content from the South Pole ice core
Millennial and orbital-scale variability in a 54,000-year record of total air content from the South Pole ice core Open
The total air content (TAC) of polar ice cores has long been considered a potential proxy for past ice sheet elevation. Recent work, however, has shown that a variety of other factors also influence this parameter. In this paper we present…
View article: Southern Hemisphere atmospheric history of carbon monoxide over the late Holocene reconstructed from multiple Antarctic ice archives
Southern Hemisphere atmospheric history of carbon monoxide over the late Holocene reconstructed from multiple Antarctic ice archives Open
Carbon monoxide (CO) is a naturally occurring atmospheric trace gas, a regulated pollutant and one of the main components determining the oxidative capacity of the atmosphere. Evaluating climate-chemical models under different conditions t…
View article: Tropical sources dominated methane changes of the last glacial maximum and deglaciation
Tropical sources dominated methane changes of the last glacial maximum and deglaciation Open
Constraining the causes of past atmospheric methane variability is important for understanding links between methane and climate. Abrupt methane changes during the last deglaciation have been intensely studied for this purpose, but the rel…
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…