Climatic Implications of Total Gas Content in Ice at Camp Century

Raynaud, Dominique; Lorius, C.

doi:10.1038/243283a0

Cited by 58 publications

(30 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This range, also observed for some near-coastal sites, is larger for sites affected by significant altitude changes for LGM ice as, for example, observed at Camp Century (Dansgaard et al, 1969;Raynaud and Lorius, 1973;Vinther et al, 2009).…”

Section: Water Isotopes As Indicators Of Past Temperaturesmentioning

confidence: 71%

“…Although not fully understood, these variations which are linked to the firnification process are now extensively used for dating purposes (Kawamura et al, , 2012Suwa and Bender, 2008;Landais et al, 2012). The same applies for the record of total gas content; beyond being influenced by the air pressure and thus the altitude of the ice sheet (Raynaud and Lorius, 1973), the obliquity cycle is clearly imprinted in the glacial-interglacial record Lipenkov et al, 2011). Vinther et al (2009) pointed out that this gas content information confirms the Holocene thinning of the Greenland ice sheet derived by combining isotopic data from deep ice cores (Camp Century, Dye 3, GRIP and North GRIP) and from ice cores from small marginal ice caps (Renland and Agassiz); this approach gives a convincing example of how one can separate the Greenland temperature and surface elevation histories.…”

Section: Greenhouse Gases and Other Properties Recorded In The Entrapmentioning

confidence: 99%

“…Measuring their chemical composition and applying 14 C dating to its CO 2 component -which appeared less promising than initially thought -were the main motivations of Hans Oeschger and his team for studying ice cores. In France, Dominique Raynaud developed the measurement of the total gas content, a parameter interpreted as an indicator of the change in the altitude of the ice sheet (Lorius et al, 1968;Raynaud and Lorius, 1973). However, due to the lack of a proper extraction method, it then took 10 yr or so to reliably measure the CO 2 concentration of ancient air, one common goal of the Swiss and French teams.…”

Section: Greenhouse Gases and Other Properties Recorded In The Entrapmentioning

confidence: 99%

See 2 more Smart Citations

A brief history of ice core science over the last 50 yr

Jouzel

2013

Clim. Past

104

View full text Add to dashboard Cite

Abstract. For about 50 yr, ice cores have provided a wealth of information about past climatic and environmental changes. Ice cores from Greenland, Antarctica and other glacier-covered regions now encompass a variety of time scales. However, the longer time scales (e.g. at least back to the Last Glacial period) are covered by deep ice cores, the number of which is still very limited: seven from Greenland, with only one providing an undisturbed record of a part of the last interglacial period, and a dozen from Antarctica, with the longest record covering the last 800 000 yr. This article aims to summarize this successful adventure initiated by a few pioneers and their teams and to review key scientific results by focusing on climate (in particular water isotopes) and climate-related (e.g. greenhouse gases) reconstructions. Future research is well taken into account by the four projects defined by IPICS. However, it remains a challenge to get an intact record of the Last Interglacial in Greenland and to extend the Antarctic record through the mid-Pleistocene transition, if possible back to 1.5 Ma.

show abstract

Section: Water Isotopes As Indicators Of Past Temperaturesmentioning

confidence: 71%

Section: Greenhouse Gases and Other Properties Recorded In The Entrapmentioning

confidence: 99%

Section: Greenhouse Gases and Other Properties Recorded In The Entrapmentioning

confidence: 99%

See 1 more Smart Citation

A brief history of ice core science over the last 50 yr

Jouzel

2013

Clim. Past

104

View full text Add to dashboard Cite

show abstract

“…TAC was initially developed to provide robust information about the past surface elevation of ice sheets (Lorius et al, 1968;Raynaud and Lorius, 1973), due to its pressure and, thus, altitude dependence. However, consecutive studies showed that the densification and bubble close-off processes have an even larger influence on the pore volume enclosed in polar ice and, thus, on TAC.…”

Section: Introductionmentioning

confidence: 99%

Climatic and insolation control on the high-resolution total air content in the NGRIP ice core

et al. 2016

View full text Add to dashboard Cite

Abstract. Because the total air content (TAC) of polar ice is directly affected by the atmospheric pressure and temperature, its record in polar ice cores was initially considered as a proxy for past ice sheet elevation changes. However, the Antarctic ice core TAC record is known to also contain an insolation signature, although the underlying physical mechanisms are still a matter of debate. Here we present a highresolution TAC record over the whole North Greenland Ice Core Project ice core, covering the last 120 000 years, which independently supports an insolation signature in Greenland. Wavelet analysis reveals a clear precession and obliquity signal similar to previous findings on Antarctic TAC, with a different insolation history. In our high-resolution record we also find a decrease of 4-6 % (4-5 mL kg −1 ) in TAC as a response to Dansgaard-Oeschger events (DO events). TAC starts to decrease in parallel to increasing Greenland surface temperature and slightly before CH 4 reacts to the warming but also shows a two-step decline that lasts for several centuries into the warm interstadial. The TAC response is larger than expected considering only changes in air density by local temperature and atmospheric pressure as a driver, pointing to a transient firnification response caused by the accumulation-induced increase in the load on the firn at bubble close-off, while temperature changes deeper in the firn are still small.

show abstract

“…The total volume of air entrapped in these bubbles is directly related to atmospheric conditions at the time of close off, particularly barometric pressure and temperature. Consequently, if the temperature history is known or can be assumed for a given location, it is possible to determine the record of pressure, and therefore elevation, for that location (Raynaud & Lorius, 1973;Raynaud & Lebel , 1979). During the last glaciation, the polar ice sheets were areally larger and, consequently at greater elevations than today.…”

Section: Palaeoelevations and Gaseous Atmospheric Compositionmentioning

confidence: 99%

Past atmospheric environments revealed by polar ice core studies

Herron

1983

Hydrological Sciences Journal

View full text Add to dashboard Cite

The polar ice sheets of Greenland and Antarctica are unique sedimentary environments which offer valuable information on the climate and atmospheric environment of the past. The prevailing low temperatures, lack of mixing of strata, and relatively high accumulation rates result in high quality records which may be resolved in great detail, frequently at the scale of seasons of the year. Deformation of ice at great depth reduces the resolution but extends the available time span to hundreds of thousands of years. Climatic and environmental information is obtained from ice cores penetrating the ice sheets and is derived from the composition of the ice itself, as well as from chemical impurities and entrapped air bubbles. Ice core signals can be related to climatic variables such as mean annual temperature, summer warmth, and past precipitation rates; past environmental effects that can be detected from ice core data include volcanic eruptions, changes in solar activity, and the impact of man's activities on recent snow composition.

show abstract

Climatic Implications of Total Gas Content in Ice at Camp Century

Cited by 58 publications

References 4 publications

A brief history of ice core science over the last 50 yr

A brief history of ice core science over the last 50 yr

Climatic and insolation control on the high-resolution total air content in the NGRIP ice core

Past atmospheric environments revealed by polar ice core studies

Contact Info

Product

Resources

About