Rainfall response to orbital and millennial forcing in northern Peru over the last 18 ka
We present a high-resolution marine record of sediment input from the Guayas River, Ecuador, that reflects changes in precipitation along western equatorial South America during the last 18ka. We use log (Ti/Ca) derived from X-ray Fluorescence (XRF) to document terrigenous input from riverine runoff...
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ftoceanrep:oai:oceanrep.geomar.de:22129 2023-05-15T17:31:03+02:00 Rainfall response to orbital and millennial forcing in northern Peru over the last 18 ka Mollier-Vogel, Elfi Leduc, Guillaume Böschen, Tebke Martinez, Philippe Schneider, Ralph 2013-09-15 text https://oceanrep.geomar.de/id/eprint/22129/ https://oceanrep.geomar.de/id/eprint/22129/1/1-s2.0-S0277379113002412-main.pdf https://doi.org/10.1016/j.quascirev.2013.06.021 en eng Elsevier https://oceanrep.geomar.de/id/eprint/22129/1/1-s2.0-S0277379113002412-main.pdf Mollier-Vogel, E., Leduc, G., Böschen, T., Martinez, P. and Schneider, R. (2013) Rainfall response to orbital and millennial forcing in northern Peru over the last 18 ka. Quaternary Science Reviews, 76 . pp. 29-38. DOI 10.1016/j.quascirev.2013.06.021 <https://doi.org/10.1016/j.quascirev.2013.06.021>. doi:10.1016/j.quascirev.2013.06.021 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2013 ftoceanrep https://doi.org/10.1016/j.quascirev.2013.06.021 2023-04-07T15:10:30Z We present a high-resolution marine record of sediment input from the Guayas River, Ecuador, that reflects changes in precipitation along western equatorial South America during the last 18ka. We use log (Ti/Ca) derived from X-ray Fluorescence (XRF) to document terrigenous input from riverine runoff that integrates rainfall from the Guayas River catchment. We find that rainfall-induced riverine runoff has increased during the Holocene and decreased during the last deglaciation. Superimposed on those long-term trends, we find that rainfall was probably slightly increased during the Younger Dryas, while the Heinrich event 1 was marked by an extreme load of terrigenous input, probably reflecting one of the wettest period over the time interval studied. When we compare our results to other Deglacial to Holocene rainfall records located across the tropical South American continent, different modes of variability become apparent. The records of rainfall variability imply that changes in the hydrological cycle at orbital and sub-orbital timescales were different from western to eastern South America. Orbital forcing caused an antiphase behavior in rainfall trends between eastern and western equatorial South America. In contrast, millennial-scale rainfall changes, remotely connected to the North Atlantic climate variability, led to homogenously wetter conditions over eastern and western equatorial South America during North Atlantic cold spells. These results may provide helpful diagnostics for testing the regional rainfall sensitivity in climate models and help to refine rainfall projections in South America for the next century. Article in Journal/Newspaper North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Quaternary Science Reviews 76 29 38 |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
We present a high-resolution marine record of sediment input from the Guayas River, Ecuador, that reflects changes in precipitation along western equatorial South America during the last 18ka. We use log (Ti/Ca) derived from X-ray Fluorescence (XRF) to document terrigenous input from riverine runoff that integrates rainfall from the Guayas River catchment. We find that rainfall-induced riverine runoff has increased during the Holocene and decreased during the last deglaciation. Superimposed on those long-term trends, we find that rainfall was probably slightly increased during the Younger Dryas, while the Heinrich event 1 was marked by an extreme load of terrigenous input, probably reflecting one of the wettest period over the time interval studied. When we compare our results to other Deglacial to Holocene rainfall records located across the tropical South American continent, different modes of variability become apparent. The records of rainfall variability imply that changes in the hydrological cycle at orbital and sub-orbital timescales were different from western to eastern South America. Orbital forcing caused an antiphase behavior in rainfall trends between eastern and western equatorial South America. In contrast, millennial-scale rainfall changes, remotely connected to the North Atlantic climate variability, led to homogenously wetter conditions over eastern and western equatorial South America during North Atlantic cold spells. These results may provide helpful diagnostics for testing the regional rainfall sensitivity in climate models and help to refine rainfall projections in South America for the next century. |
format |
Article in Journal/Newspaper |
author |
Mollier-Vogel, Elfi Leduc, Guillaume Böschen, Tebke Martinez, Philippe Schneider, Ralph |
spellingShingle |
Mollier-Vogel, Elfi Leduc, Guillaume Böschen, Tebke Martinez, Philippe Schneider, Ralph Rainfall response to orbital and millennial forcing in northern Peru over the last 18 ka |
author_facet |
Mollier-Vogel, Elfi Leduc, Guillaume Böschen, Tebke Martinez, Philippe Schneider, Ralph |
author_sort |
Mollier-Vogel, Elfi |
title |
Rainfall response to orbital and millennial forcing in northern Peru over the last 18 ka |
title_short |
Rainfall response to orbital and millennial forcing in northern Peru over the last 18 ka |
title_full |
Rainfall response to orbital and millennial forcing in northern Peru over the last 18 ka |
title_fullStr |
Rainfall response to orbital and millennial forcing in northern Peru over the last 18 ka |
title_full_unstemmed |
Rainfall response to orbital and millennial forcing in northern Peru over the last 18 ka |
title_sort |
rainfall response to orbital and millennial forcing in northern peru over the last 18 ka |
publisher |
Elsevier |
publishDate |
2013 |
url |
https://oceanrep.geomar.de/id/eprint/22129/ https://oceanrep.geomar.de/id/eprint/22129/1/1-s2.0-S0277379113002412-main.pdf https://doi.org/10.1016/j.quascirev.2013.06.021 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/22129/1/1-s2.0-S0277379113002412-main.pdf Mollier-Vogel, E., Leduc, G., Böschen, T., Martinez, P. and Schneider, R. (2013) Rainfall response to orbital and millennial forcing in northern Peru over the last 18 ka. Quaternary Science Reviews, 76 . pp. 29-38. DOI 10.1016/j.quascirev.2013.06.021 <https://doi.org/10.1016/j.quascirev.2013.06.021>. doi:10.1016/j.quascirev.2013.06.021 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.quascirev.2013.06.021 |
container_title |
Quaternary Science Reviews |
container_volume |
76 |
container_start_page |
29 |
op_container_end_page |
38 |
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1766128366421803008 |