Jon S. Edwards
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View article: Greenland Ice Cores Reveal a South‐To‐North Difference in Holocene Thermal Maximum Timings
Greenland Ice Cores Reveal a South‐To‐North Difference in Holocene Thermal Maximum Timings Open
Holocene temperature evolution remains poorly understood. Proxies in the early and mid‐Holocene suggest a Holocene Thermal Maximum (HTM) where temperatures exceed the pre‐industrial, whereas climate models generally simulate monotonic warm…
View article: Climate sensitive growth and yield models in Canadian forestry: Challenges and opportunities
Climate sensitive growth and yield models in Canadian forestry: Challenges and opportunities Open
Growth and yield models in forest management planning are used to project future forest conditions and estimate quantities such as wood volume and biomass. These models are crucial for assessing forest sustainability, however, some models …
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: 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: 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…
Excess methane, ethane, and propane production in Greenland ice core samples and a first characterization of the δ13C-CH4 and δD-CH4 signature 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). Interpreting these dat…
Antarctic surface temperature and elevation during the Last Glacial Maximum Open
Antarctic paleotemperatures It has been widely thought that East Antarctica was ∼9°C cooler during the Last Glacial Maximum, close to the ∼10°C difference between then and now determined independently for West Antarctica. Buizert et al. us…
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 …
Coupled artefact production of methane, ethane, and propane in polar ice cores Open
<p>Air inclusions trapped in polar ice provide unique records of the past atmospheric composition ranging from key greenhouse gases to short-lived trace gases like ethane and propane. Provided the analyzed species concentrations and …
View article: Local artifacts in ice core methane records caused by layered bubble trapping and in situ production: a multi-site investigation
Local artifacts in ice core methane records caused by layered bubble trapping and in situ production: a multi-site investigation Open
Advances in trace gas analysis allow localised, non-atmospheric features to be resolved in ice cores, superimposed on the coherent atmospheric signal. These high-frequency signals could not have survived the low-pass filter effect that gas…