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Post-coring entrapment of modern air in some shallow ice cores collected near the firn-ice transition: evidence from CFC-12 measurements in Antarctic firn air and ice cores
modern air shallow ice cores the firn-ice transition CFC-12 measurements Antarctic firn air and ice cores
2010/8/13
In this study, we report measurements of CFC-12 (CCl2F2) in firn air and in air extracted from shallow ice cores from three Antarctic sites. The firn air data are consistent with the known atmospheric...
Holocene climate variability on millennial scales recorded in Greenland ice cores
Holocene climate variability millennial scales Greenland ice cores
2009/11/9
Climate variability is triggered by several solar and orbital cycles as well as by the intern ocean dynamics. Consequently, paleoclimate proxy records are expected to vary on very different time scale...
Difficulties in Deducing Temporal Changes in Precipitation Chemistry from Snow and Ice Cores:The Spatial Variability Problem
Temporal Changes Precipitation Chemistry Snow and Ice Cores Spatial Variability Problem
2009/10/26
Depth profiles of chemical impurities found in snow and ice have usually been
interpreted simply in terms of temporal changes in atmospheric concentrations
of the species of interest. Measurements o...
The interpretation of spikes and trends in concentration of nitrate in polar ice cores, based on evidence from snow and atmospheric measurements
nitrate polar ice cores snow
2008/11/20
Nitrate is frequently measured in ice cores, but its interpretation remains immature. Using daily snow surface concentrations of nitrate at Halley (Antarctica) for 2004–2005, we show that sharp spikes...
Past temperature reconstructions from deep ice cores: relevance for future climate change
deep ice cores future climate change
2008/11/11
Ice cores provide unique archives of past climate and environmental changes based only on physical processes. Quantitative temperature reconstructions are essential for the comparison between ice core...
Direct north-south synchronization of abrupt climate change record in ice cores using Beryllium 10
synchronization ice cores Beryllium 10
2008/11/5
A new, decadally resolved record of the 10Be peak at 41 kyr from the EPICA Dome C ice core (Antarctica) is used to match it with the same peak in the GRIP ice core (Greenland). This permits a direct s...
New constraints on the gas age-ice age difference along the EPICA ice cores, 0–50 kyr
age-ice EPICA ice cores
2008/11/5
Gas is trapped in polar ice sheets at ~50–120 m below the surface and is therefore younger than the surrounding ice. Firn densification models are used to evaluate this ice age-gas age difference (Δag...
Synchronisation of the EDML and EDC ice cores for the last 52 kyr by volcanic signature matching
EDML EDC ice volcanic signature matching
2008/11/5
A common time scale for the EPICA ice cores from Dome C (EDC) and Dronning Maud Land (EDML) has been established. Since the EDML core was not drilled on a dome, the development of the EDML1 time scale...
Precipitation record since AD 1600 from ice cores on the central Tibetan Plateau
ice cores central Tibetan Plateau
2008/10/31
Lack of reliable long-term precipitation record from the northern Tibetan Plateau has constrained our understanding of precipitation variations in this region. We drilled an ice core on the Puruogangr...
On the application and interpretation of Keeling plots in paleo climate research – deciphering δ13C of atmospheric CO2 measured in ice cores
application interpretation Keeling plots paleo climate research ice cores
2010/1/13
The Keeling plot analysis is an interpretation method widely used in terrestrial carbon cycle research to quantify exchange processes of carbon between terrestrial reservoirs and the atmosphere. Here,...