HOW LONG HAVE WE BEEN IN THE ANTHROPOCENE ERA? An Editorial Comment
With great interest we have read Ruddiman’s intriguing article which is in favor of placing the start of the Anthropocene at 5–8 millennia BP instead of the late quarter of the 18th century. He shows how land exploitation for agriculture and animal husbandry may have led to enhanced emissions of CO2...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.646.4528 2023-05-15T16:39:10+02:00 HOW LONG HAVE WE BEEN IN THE ANTHROPOCENE ERA? An Editorial Comment The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.646.4528 http://stephenschneider.stanford.edu/Publications/PDF_Papers/CrutzenSteffen2003.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.646.4528 http://stephenschneider.stanford.edu/Publications/PDF_Papers/CrutzenSteffen2003.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://stephenschneider.stanford.edu/Publications/PDF_Papers/CrutzenSteffen2003.pdf text ftciteseerx 2016-01-08T16:11:37Z With great interest we have read Ruddiman’s intriguing article which is in favor of placing the start of the Anthropocene at 5–8 millennia BP instead of the late quarter of the 18th century. He shows how land exploitation for agriculture and animal husbandry may have led to enhanced emissions of CO2 and CH4 to the atmosphere, thereby modifying the expected changes in the concentrations of these gases beyond those expected from variations in the Milankovich orbital parameters. Much of his argument depends on the correctness of their projected CH4 concen-tration curve from 7,000 years BP to pre-industrial times showing a decline to about 425 ppb, according to Milankovich, instead of the measured 700 ppb. It appears, however, strange that in Ruddiman’s analysis the proposed increase of CH4 due to anthropogenic activities stopped at about 1000 years BP, because ice core data showed almost constant mixing ratios of CH4 between 1000 years BP and about 200 years ago before the rapid rise of CH4 in the industrial period (IPCC, 2001). A major feature of Ruddiman’s argument is that natural atmospheric CH4 concentrations depend strongly on geological varying summer time insolations in Text ice core Unknown |
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With great interest we have read Ruddiman’s intriguing article which is in favor of placing the start of the Anthropocene at 5–8 millennia BP instead of the late quarter of the 18th century. He shows how land exploitation for agriculture and animal husbandry may have led to enhanced emissions of CO2 and CH4 to the atmosphere, thereby modifying the expected changes in the concentrations of these gases beyond those expected from variations in the Milankovich orbital parameters. Much of his argument depends on the correctness of their projected CH4 concen-tration curve from 7,000 years BP to pre-industrial times showing a decline to about 425 ppb, according to Milankovich, instead of the measured 700 ppb. It appears, however, strange that in Ruddiman’s analysis the proposed increase of CH4 due to anthropogenic activities stopped at about 1000 years BP, because ice core data showed almost constant mixing ratios of CH4 between 1000 years BP and about 200 years ago before the rapid rise of CH4 in the industrial period (IPCC, 2001). A major feature of Ruddiman’s argument is that natural atmospheric CH4 concentrations depend strongly on geological varying summer time insolations in |
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The Pennsylvania State University CiteSeerX Archives |
format |
Text |
title |
HOW LONG HAVE WE BEEN IN THE ANTHROPOCENE ERA? An Editorial Comment |
spellingShingle |
HOW LONG HAVE WE BEEN IN THE ANTHROPOCENE ERA? An Editorial Comment |
title_short |
HOW LONG HAVE WE BEEN IN THE ANTHROPOCENE ERA? An Editorial Comment |
title_full |
HOW LONG HAVE WE BEEN IN THE ANTHROPOCENE ERA? An Editorial Comment |
title_fullStr |
HOW LONG HAVE WE BEEN IN THE ANTHROPOCENE ERA? An Editorial Comment |
title_full_unstemmed |
HOW LONG HAVE WE BEEN IN THE ANTHROPOCENE ERA? An Editorial Comment |
title_sort |
how long have we been in the anthropocene era? an editorial comment |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.646.4528 http://stephenschneider.stanford.edu/Publications/PDF_Papers/CrutzenSteffen2003.pdf |
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ice core |
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ice core |
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http://stephenschneider.stanford.edu/Publications/PDF_Papers/CrutzenSteffen2003.pdf |
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http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.646.4528 http://stephenschneider.stanford.edu/Publications/PDF_Papers/CrutzenSteffen2003.pdf |
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