Tropical rainfall over the last two millennia: Evidence for a low-latitude hydrologic seesaw
The presence of a low-to mid-latitude interhemispheric hydrologic seesaw is apparent over orbital and glacial-interglacial timescales, but its existence over the most recent past remains unclear. Here we investigate, based on climate proxy reconstructions from both hemispheres, the inter-hemispheric...
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ftethz:oai:www.research-collection.ethz.ch:20.500.11850/235050 2023-08-20T04:08:16+02:00 Tropical rainfall over the last two millennia: Evidence for a low-latitude hydrologic seesaw Lechleitner, Franziska A. Breitenbach, Sebastian F.M. Rehfeld, Kira Ridley, Harriet E. Asmerom, Yemane Prufer, Keith M. Marwan, Norbert Goswami, Bedartha Kennett, Douglas J. Aquino, Valorie V. Polyak, Victor Haug, Gerald H. Eglinton, Timothy I. Baldini, James U.L. 2017-04-05 application/application/pdf https://hdl.handle.net/20.500.11850/235050 https://doi.org/10.3929/ethz-b-000130465 en eng Nature info:eu-repo/semantics/altIdentifier/wos/000398337300001 http://hdl.handle.net/20.500.11850/235050 doi:10.3929/ethz-b-000130465 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International Scientific Reports, 7 NORTH-ATLANTIC CLIMATE INTERTROPICAL CONVERGENCE ZONE COMMON ERA ICE-AGE VOLCANIC-ERUPTIONS PAST MILLENNIUM HIGH-RESOLUTION MONSOON RECORD VARIABILITY CAVE info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2017 ftethz https://doi.org/20.500.11850/23505010.3929/ethz-b-000130465 2023-07-30T23:46:56Z The presence of a low-to mid-latitude interhemispheric hydrologic seesaw is apparent over orbital and glacial-interglacial timescales, but its existence over the most recent past remains unclear. Here we investigate, based on climate proxy reconstructions from both hemispheres, the inter-hemispherical phasing of the Intertropical Convergence Zone (ITCZ) and the low-to mid-latitude teleconnections in the Northern Hemisphere over the past 2000 years. A clear feature is a persistent southward shift of the ITCZ during the Little Ice Age until the beginning of the 19th Century. Strong covariation between our new composite ITCZ-stack and North Atlantic Oscillation (NAO) records reveals a tight coupling between these two synoptic weather and climate phenomena over decadal-to-centennial timescales. This relationship becomes most apparent when comparing two precisely dated, high-resolution paleorainfall records from Belize and Scotland, indicating that the low-to mid-latitude teleconnection was also active over annual-decadal timescales. It is likely a combination of external forcing, i.e., solar and volcanic, and internal feedbacks, that drives the synchronous ITCZ and NAO shifts via energy flux perturbations in the tropics. ISSN:2045-2322 Article in Journal/Newspaper North Atlantic North Atlantic oscillation ETH Zürich Research Collection |
institution |
Open Polar |
collection |
ETH Zürich Research Collection |
op_collection_id |
ftethz |
language |
English |
topic |
NORTH-ATLANTIC CLIMATE INTERTROPICAL CONVERGENCE ZONE COMMON ERA ICE-AGE VOLCANIC-ERUPTIONS PAST MILLENNIUM HIGH-RESOLUTION MONSOON RECORD VARIABILITY CAVE |
spellingShingle |
NORTH-ATLANTIC CLIMATE INTERTROPICAL CONVERGENCE ZONE COMMON ERA ICE-AGE VOLCANIC-ERUPTIONS PAST MILLENNIUM HIGH-RESOLUTION MONSOON RECORD VARIABILITY CAVE Lechleitner, Franziska A. Breitenbach, Sebastian F.M. Rehfeld, Kira Ridley, Harriet E. Asmerom, Yemane Prufer, Keith M. Marwan, Norbert Goswami, Bedartha Kennett, Douglas J. Aquino, Valorie V. Polyak, Victor Haug, Gerald H. Eglinton, Timothy I. Baldini, James U.L. Tropical rainfall over the last two millennia: Evidence for a low-latitude hydrologic seesaw |
topic_facet |
NORTH-ATLANTIC CLIMATE INTERTROPICAL CONVERGENCE ZONE COMMON ERA ICE-AGE VOLCANIC-ERUPTIONS PAST MILLENNIUM HIGH-RESOLUTION MONSOON RECORD VARIABILITY CAVE |
description |
The presence of a low-to mid-latitude interhemispheric hydrologic seesaw is apparent over orbital and glacial-interglacial timescales, but its existence over the most recent past remains unclear. Here we investigate, based on climate proxy reconstructions from both hemispheres, the inter-hemispherical phasing of the Intertropical Convergence Zone (ITCZ) and the low-to mid-latitude teleconnections in the Northern Hemisphere over the past 2000 years. A clear feature is a persistent southward shift of the ITCZ during the Little Ice Age until the beginning of the 19th Century. Strong covariation between our new composite ITCZ-stack and North Atlantic Oscillation (NAO) records reveals a tight coupling between these two synoptic weather and climate phenomena over decadal-to-centennial timescales. This relationship becomes most apparent when comparing two precisely dated, high-resolution paleorainfall records from Belize and Scotland, indicating that the low-to mid-latitude teleconnection was also active over annual-decadal timescales. It is likely a combination of external forcing, i.e., solar and volcanic, and internal feedbacks, that drives the synchronous ITCZ and NAO shifts via energy flux perturbations in the tropics. ISSN:2045-2322 |
format |
Article in Journal/Newspaper |
author |
Lechleitner, Franziska A. Breitenbach, Sebastian F.M. Rehfeld, Kira Ridley, Harriet E. Asmerom, Yemane Prufer, Keith M. Marwan, Norbert Goswami, Bedartha Kennett, Douglas J. Aquino, Valorie V. Polyak, Victor Haug, Gerald H. Eglinton, Timothy I. Baldini, James U.L. |
author_facet |
Lechleitner, Franziska A. Breitenbach, Sebastian F.M. Rehfeld, Kira Ridley, Harriet E. Asmerom, Yemane Prufer, Keith M. Marwan, Norbert Goswami, Bedartha Kennett, Douglas J. Aquino, Valorie V. Polyak, Victor Haug, Gerald H. Eglinton, Timothy I. Baldini, James U.L. |
author_sort |
Lechleitner, Franziska A. |
title |
Tropical rainfall over the last two millennia: Evidence for a low-latitude hydrologic seesaw |
title_short |
Tropical rainfall over the last two millennia: Evidence for a low-latitude hydrologic seesaw |
title_full |
Tropical rainfall over the last two millennia: Evidence for a low-latitude hydrologic seesaw |
title_fullStr |
Tropical rainfall over the last two millennia: Evidence for a low-latitude hydrologic seesaw |
title_full_unstemmed |
Tropical rainfall over the last two millennia: Evidence for a low-latitude hydrologic seesaw |
title_sort |
tropical rainfall over the last two millennia: evidence for a low-latitude hydrologic seesaw |
publisher |
Nature |
publishDate |
2017 |
url |
https://hdl.handle.net/20.500.11850/235050 https://doi.org/10.3929/ethz-b-000130465 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
Scientific Reports, 7 |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/000398337300001 http://hdl.handle.net/20.500.11850/235050 doi:10.3929/ethz-b-000130465 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International |
op_doi |
https://doi.org/20.500.11850/23505010.3929/ethz-b-000130465 |
_version_ |
1774720456183513088 |