Three-phased Heinrich Stadial 4 recorded in NE Brazil stalagmites
The growth intervals of stalagmites from Northeast (NE) Brazil provide precise information on the timing of pluvial periods associated with the southward shift of the Intertropical Convergence Zone (ITCZ) during Heinrich Stadials (HS). Using 230Th dating and annual band counting, we constrained the...
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ftunivreading:oai:centaur.reading.ac.uk:82119 2024-06-23T07:45:54+00:00 Three-phased Heinrich Stadial 4 recorded in NE Brazil stalagmites Wendt, Kathleen A. Häuselmann, Anamaria D. Fleitmann, Dominik Berry, Akemi E. Wang, Xianfeng Auler, Augusto S. Cheng, Hai Edwards, R. Lawrence 2019-03-15 https://centaur.reading.ac.uk/82119/ unknown Elsevier Wendt, K. A., Häuselmann, A. D., Fleitmann, D. <https://centaur.reading.ac.uk/view/creators/90004859.html>, Berry, A. E., Wang, X., Auler, A. S., Cheng, H. and Edwards, R. L. (2019) Three-phased Heinrich Stadial 4 recorded in NE Brazil stalagmites. Earth and Planetary Science Letters, 510. pp. 94-102. ISSN 0012-821X doi: https://doi.org/10.1016/j.epsl.2018.12.025 <https://doi.org/10.1016/j.epsl.2018.12.025> Article PeerReviewed 2019 ftunivreading https://doi.org/10.1016/j.epsl.2018.12.025 2024-06-11T15:08:23Z The growth intervals of stalagmites from Northeast (NE) Brazil provide precise information on the timing of pluvial periods associated with the southward shift of the Intertropical Convergence Zone (ITCZ) during Heinrich Stadials (HS). Using 230Th dating and annual band counting, we constrained the timing of the pluvial period associated with HS4 to occur between 40.06 ± 0.11 and 38.38 ± 0.10 thousand years before present (kyr B.P.), coinciding with the interval between the end of Greenland Interstadial (GIS)/Chinese Interstadial (CIS) 9 and GIS/CIS 8. Oxygen isotope analysis shows a close anti-correlation between NE Brazil wet periods and East Asian monsoon intensity recorded in Hulu Cave, supporting the hypothesis of a southerly migration of the global ITCZ during HS4. The pluvial anomaly can be divided into three phases, starting with a precursor, less intense pluvial interval (phase 1) between 40.06 ± 0.11 and kyr B.P., likely correlative to the cool phase of the North Atlantic immediately before the partial collapse of the Laurentide Ice Sheet (LIS). This phase ends abruptly (<30 yr) and is followed by an intense pluvial phase (phase 2) that spans approximately 5 centuries. Luminescent couplets are identified in all samples between 39.50 ± 0.10 and 39.41 ± 0.10 kyr B.P., and are interpreted as a period of two rainy seasons per year during which the southernmost extent of the inland West Atlantic ITCZ reached south of our study site (10°S). Following the end of phase 2 at 39.07 ± 0.32 kyr B.P., intermittent speleothem growth suggests intermittent rainfall over NE Brazil (phase 3) until the abrupt onset of GIS/CIS 8 at 38.38 ± 0.10 kyr B.P. The phases identified in NE Brazilian stalagmites agree with the three-phased variation in low-latitude proxies registered in Northern Greenland, and are consistent with changes in methane concentrations recorded in the West Antarctic Ice Sheet (WAIS) Divide. The synchronicity of these distant records suggests a multi-phased response of tropical atmospheric circulation ... Article in Journal/Newspaper Antarc* Antarctic Greenland Ice Sheet North Atlantic CentAUR: Central Archive at the University of Reading Antarctic West Antarctic Ice Sheet Greenland Hulu ENVELOPE(8.610,8.610,62.837,62.837) Earth and Planetary Science Letters 510 94 102 |
institution |
Open Polar |
collection |
CentAUR: Central Archive at the University of Reading |
op_collection_id |
ftunivreading |
language |
unknown |
description |
The growth intervals of stalagmites from Northeast (NE) Brazil provide precise information on the timing of pluvial periods associated with the southward shift of the Intertropical Convergence Zone (ITCZ) during Heinrich Stadials (HS). Using 230Th dating and annual band counting, we constrained the timing of the pluvial period associated with HS4 to occur between 40.06 ± 0.11 and 38.38 ± 0.10 thousand years before present (kyr B.P.), coinciding with the interval between the end of Greenland Interstadial (GIS)/Chinese Interstadial (CIS) 9 and GIS/CIS 8. Oxygen isotope analysis shows a close anti-correlation between NE Brazil wet periods and East Asian monsoon intensity recorded in Hulu Cave, supporting the hypothesis of a southerly migration of the global ITCZ during HS4. The pluvial anomaly can be divided into three phases, starting with a precursor, less intense pluvial interval (phase 1) between 40.06 ± 0.11 and kyr B.P., likely correlative to the cool phase of the North Atlantic immediately before the partial collapse of the Laurentide Ice Sheet (LIS). This phase ends abruptly (<30 yr) and is followed by an intense pluvial phase (phase 2) that spans approximately 5 centuries. Luminescent couplets are identified in all samples between 39.50 ± 0.10 and 39.41 ± 0.10 kyr B.P., and are interpreted as a period of two rainy seasons per year during which the southernmost extent of the inland West Atlantic ITCZ reached south of our study site (10°S). Following the end of phase 2 at 39.07 ± 0.32 kyr B.P., intermittent speleothem growth suggests intermittent rainfall over NE Brazil (phase 3) until the abrupt onset of GIS/CIS 8 at 38.38 ± 0.10 kyr B.P. The phases identified in NE Brazilian stalagmites agree with the three-phased variation in low-latitude proxies registered in Northern Greenland, and are consistent with changes in methane concentrations recorded in the West Antarctic Ice Sheet (WAIS) Divide. The synchronicity of these distant records suggests a multi-phased response of tropical atmospheric circulation ... |
format |
Article in Journal/Newspaper |
author |
Wendt, Kathleen A. Häuselmann, Anamaria D. Fleitmann, Dominik Berry, Akemi E. Wang, Xianfeng Auler, Augusto S. Cheng, Hai Edwards, R. Lawrence |
spellingShingle |
Wendt, Kathleen A. Häuselmann, Anamaria D. Fleitmann, Dominik Berry, Akemi E. Wang, Xianfeng Auler, Augusto S. Cheng, Hai Edwards, R. Lawrence Three-phased Heinrich Stadial 4 recorded in NE Brazil stalagmites |
author_facet |
Wendt, Kathleen A. Häuselmann, Anamaria D. Fleitmann, Dominik Berry, Akemi E. Wang, Xianfeng Auler, Augusto S. Cheng, Hai Edwards, R. Lawrence |
author_sort |
Wendt, Kathleen A. |
title |
Three-phased Heinrich Stadial 4 recorded in NE Brazil stalagmites |
title_short |
Three-phased Heinrich Stadial 4 recorded in NE Brazil stalagmites |
title_full |
Three-phased Heinrich Stadial 4 recorded in NE Brazil stalagmites |
title_fullStr |
Three-phased Heinrich Stadial 4 recorded in NE Brazil stalagmites |
title_full_unstemmed |
Three-phased Heinrich Stadial 4 recorded in NE Brazil stalagmites |
title_sort |
three-phased heinrich stadial 4 recorded in ne brazil stalagmites |
publisher |
Elsevier |
publishDate |
2019 |
url |
https://centaur.reading.ac.uk/82119/ |
long_lat |
ENVELOPE(8.610,8.610,62.837,62.837) |
geographic |
Antarctic West Antarctic Ice Sheet Greenland Hulu |
geographic_facet |
Antarctic West Antarctic Ice Sheet Greenland Hulu |
genre |
Antarc* Antarctic Greenland Ice Sheet North Atlantic |
genre_facet |
Antarc* Antarctic Greenland Ice Sheet North Atlantic |
op_relation |
Wendt, K. A., Häuselmann, A. D., Fleitmann, D. <https://centaur.reading.ac.uk/view/creators/90004859.html>, Berry, A. E., Wang, X., Auler, A. S., Cheng, H. and Edwards, R. L. (2019) Three-phased Heinrich Stadial 4 recorded in NE Brazil stalagmites. Earth and Planetary Science Letters, 510. pp. 94-102. ISSN 0012-821X doi: https://doi.org/10.1016/j.epsl.2018.12.025 <https://doi.org/10.1016/j.epsl.2018.12.025> |
op_doi |
https://doi.org/10.1016/j.epsl.2018.12.025 |
container_title |
Earth and Planetary Science Letters |
container_volume |
510 |
container_start_page |
94 |
op_container_end_page |
102 |
_version_ |
1802642926707146752 |