Supporting evidence from the EPICA Dronning Maud
The most direct method of investigating past variations of the atmospheric CO2 concentration before 1958, when continuous direct atmospheric CO2 measurements started, is the analysis of air extracted from suitable ice cores. Here we present a new detailed CO2 record from the Dronning Maud Land (DML)...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.539.4123 2023-05-15T13:32:25+02:00 Supporting evidence from the EPICA Dronning Maud Urs Siegenthaler Eric Monnin Kenji Kawamura Renato Spahni Jakob Schwander Bernhard Stauffer Thomas F. Stocker The Pennsylvania State University CiteSeerX Archives 2004 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.539.4123 http://www.climate.unibe.ch/~stocker/papers/siegenthaler05tel.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.539.4123 http://www.climate.unibe.ch/~stocker/papers/siegenthaler05tel.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.climate.unibe.ch/~stocker/papers/siegenthaler05tel.pdf text 2004 ftciteseerx 2016-01-08T10:57:42Z The most direct method of investigating past variations of the atmospheric CO2 concentration before 1958, when continuous direct atmospheric CO2 measurements started, is the analysis of air extracted from suitable ice cores. Here we present a new detailed CO2 record from the Dronning Maud Land (DML) ice core, drilled in the framework of the European Project for Ice Coring in Antarctica (EPICA) and some new measurements on a previously drilled ice core from the South Pole. The DML CO2 record shows an increase from about 278 to 282 parts per million by volume (ppmv) between AD 1000 and AD 1200 and a fairly continuous decrease to a mean value of about 277 ppmv around AD 1700. While the new South Pole measurements agree well with DML at the minimum at AD 1700 they are on average about 2 ppmv lower during the period AD 1000–1500. Published measurements from the coastal high-accumulation site Law Dome are considered as very reliable because of the reproducibility of the measurements, high temporal resolution and an accurate time scale. Other Antarctic ice cores could not, or only partly, reproduce the pre-industrial measurements from Law Dome. A comparison of the trends of DML and Law Dome shows a general agreement. However we should be able to rule out co-variations caused by the same artefact. Two possible effects are discussed, first production of CO2 by chemical reactions and second diffusion of dissolved air through the ice matrix into the bubbles. While the first effect cannot be totally excluded, comparison of the Law Dome and DML record shows that dissolved air diffusing to bubbles Text Antarc* Antarctic Antarctica DML Dronning Maud Land EPICA ice core South pole South pole Unknown Antarctic Dronning Maud Land Law Dome ENVELOPE(112.833,112.833,-66.733,-66.733) South Pole |
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English |
description |
The most direct method of investigating past variations of the atmospheric CO2 concentration before 1958, when continuous direct atmospheric CO2 measurements started, is the analysis of air extracted from suitable ice cores. Here we present a new detailed CO2 record from the Dronning Maud Land (DML) ice core, drilled in the framework of the European Project for Ice Coring in Antarctica (EPICA) and some new measurements on a previously drilled ice core from the South Pole. The DML CO2 record shows an increase from about 278 to 282 parts per million by volume (ppmv) between AD 1000 and AD 1200 and a fairly continuous decrease to a mean value of about 277 ppmv around AD 1700. While the new South Pole measurements agree well with DML at the minimum at AD 1700 they are on average about 2 ppmv lower during the period AD 1000–1500. Published measurements from the coastal high-accumulation site Law Dome are considered as very reliable because of the reproducibility of the measurements, high temporal resolution and an accurate time scale. Other Antarctic ice cores could not, or only partly, reproduce the pre-industrial measurements from Law Dome. A comparison of the trends of DML and Law Dome shows a general agreement. However we should be able to rule out co-variations caused by the same artefact. Two possible effects are discussed, first production of CO2 by chemical reactions and second diffusion of dissolved air through the ice matrix into the bubbles. While the first effect cannot be totally excluded, comparison of the Law Dome and DML record shows that dissolved air diffusing to bubbles |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Urs Siegenthaler Eric Monnin Kenji Kawamura Renato Spahni Jakob Schwander Bernhard Stauffer Thomas F. Stocker |
spellingShingle |
Urs Siegenthaler Eric Monnin Kenji Kawamura Renato Spahni Jakob Schwander Bernhard Stauffer Thomas F. Stocker Supporting evidence from the EPICA Dronning Maud |
author_facet |
Urs Siegenthaler Eric Monnin Kenji Kawamura Renato Spahni Jakob Schwander Bernhard Stauffer Thomas F. Stocker |
author_sort |
Urs Siegenthaler |
title |
Supporting evidence from the EPICA Dronning Maud |
title_short |
Supporting evidence from the EPICA Dronning Maud |
title_full |
Supporting evidence from the EPICA Dronning Maud |
title_fullStr |
Supporting evidence from the EPICA Dronning Maud |
title_full_unstemmed |
Supporting evidence from the EPICA Dronning Maud |
title_sort |
supporting evidence from the epica dronning maud |
publishDate |
2004 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.539.4123 http://www.climate.unibe.ch/~stocker/papers/siegenthaler05tel.pdf |
long_lat |
ENVELOPE(112.833,112.833,-66.733,-66.733) |
geographic |
Antarctic Dronning Maud Land Law Dome South Pole |
geographic_facet |
Antarctic Dronning Maud Land Law Dome South Pole |
genre |
Antarc* Antarctic Antarctica DML Dronning Maud Land EPICA ice core South pole South pole |
genre_facet |
Antarc* Antarctic Antarctica DML Dronning Maud Land EPICA ice core South pole South pole |
op_source |
http://www.climate.unibe.ch/~stocker/papers/siegenthaler05tel.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.539.4123 http://www.climate.unibe.ch/~stocker/papers/siegenthaler05tel.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766026848738738176 |