in stalagmites from Anjohibe Cave
Abstract: Two stalagmites from Anjohibe Cave have annual layers made up of inclusion-rich calcite over inclusion-free calcite or of darker aragonite over clear aragonite. Geochemical evidence indicates that the basal units are deposited slowly in the wet season and the upper units more rapidly in th...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.1027.7197 2023-05-15T16:38:15+02:00 in stalagmites from Anjohibe Cave George A. Brook Margaret A. Rafter L. Bruce Railsback Shaw-wen Sheen Joyce Lundberg The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1027.7197 http://hol.sagepub.com/content/9/6/695.full.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1027.7197 http://hol.sagepub.com/content/9/6/695.full.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://hol.sagepub.com/content/9/6/695.full.pdf Key words Speleothems caves annual layers ENSO palaeoclimates Madagascar text ftciteseerx 2016-10-30T00:05:06Z Abstract: Two stalagmites from Anjohibe Cave have annual layers made up of inclusion-rich calcite over inclusion-free calcite or of darker aragonite over clear aragonite. Geochemical evidence indicates that the basal units are deposited slowly in the wet season and the upper units more rapidly in the dry season. For the period with rainfall and temperature data (ad 1951–1992), layer thickness correlates well with the Southern Oscillation Index (SOI), as well as rainfall, water surplus, and actual evapotranspiration (AET) at nearby Majunga. Com-parison of the layer record for one stalagmite with 1866–1994 SOI data indicates that layer thickness correlates best with the frequency and intensity of warm, low-phase SO (El Niño) events, not with average SOI conditions. In addition, the 415-year layer thickness time-series from that speleothem agrees remarkably well with historical records of El Niño frequency, with Galápagos (Ecuador) coral records of sea-surface temperature in the eastern Pacific, and with accumulation rates on the Quelccaya Ice Cap of Peru, which are lower at times of high El Niño frequency. Text Ice cap Unknown Pacific Soi ENVELOPE(30.704,30.704,66.481,66.481) |
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Open Polar |
collection |
Unknown |
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ftciteseerx |
language |
English |
topic |
Key words Speleothems caves annual layers ENSO palaeoclimates Madagascar |
spellingShingle |
Key words Speleothems caves annual layers ENSO palaeoclimates Madagascar George A. Brook Margaret A. Rafter L. Bruce Railsback Shaw-wen Sheen Joyce Lundberg in stalagmites from Anjohibe Cave |
topic_facet |
Key words Speleothems caves annual layers ENSO palaeoclimates Madagascar |
description |
Abstract: Two stalagmites from Anjohibe Cave have annual layers made up of inclusion-rich calcite over inclusion-free calcite or of darker aragonite over clear aragonite. Geochemical evidence indicates that the basal units are deposited slowly in the wet season and the upper units more rapidly in the dry season. For the period with rainfall and temperature data (ad 1951–1992), layer thickness correlates well with the Southern Oscillation Index (SOI), as well as rainfall, water surplus, and actual evapotranspiration (AET) at nearby Majunga. Com-parison of the layer record for one stalagmite with 1866–1994 SOI data indicates that layer thickness correlates best with the frequency and intensity of warm, low-phase SO (El Niño) events, not with average SOI conditions. In addition, the 415-year layer thickness time-series from that speleothem agrees remarkably well with historical records of El Niño frequency, with Galápagos (Ecuador) coral records of sea-surface temperature in the eastern Pacific, and with accumulation rates on the Quelccaya Ice Cap of Peru, which are lower at times of high El Niño frequency. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
George A. Brook Margaret A. Rafter L. Bruce Railsback Shaw-wen Sheen Joyce Lundberg |
author_facet |
George A. Brook Margaret A. Rafter L. Bruce Railsback Shaw-wen Sheen Joyce Lundberg |
author_sort |
George A. Brook |
title |
in stalagmites from Anjohibe Cave |
title_short |
in stalagmites from Anjohibe Cave |
title_full |
in stalagmites from Anjohibe Cave |
title_fullStr |
in stalagmites from Anjohibe Cave |
title_full_unstemmed |
in stalagmites from Anjohibe Cave |
title_sort |
in stalagmites from anjohibe cave |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1027.7197 http://hol.sagepub.com/content/9/6/695.full.pdf |
long_lat |
ENVELOPE(30.704,30.704,66.481,66.481) |
geographic |
Pacific Soi |
geographic_facet |
Pacific Soi |
genre |
Ice cap |
genre_facet |
Ice cap |
op_source |
http://hol.sagepub.com/content/9/6/695.full.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1027.7197 http://hol.sagepub.com/content/9/6/695.full.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766028531815415808 |