Decoupled Hydroclimate of Central and Southwestern Iran Controlled by the Strength of Southerly‐Westerly Jets During Marine Isotope Stage 3
Abstract The regional impact of abrupt glacial climate variability remains poorly constrained for arid southwestern Asia, particularly winter dynamics during Marine Isotope Stage 3, due to limited paleoarchives in the Middle East. Here, we present continuous speleothem records of δ18O and δ13C with...
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ftdoajarticles:oai:doaj.org/article:98e23acdf7f04d07a10c0a18cfb04927 2024-09-15T18:09:19+00:00 Decoupled Hydroclimate of Central and Southwestern Iran Controlled by the Strength of Southerly‐Westerly Jets During Marine Isotope Stage 3 M. Soleimani J. L. Baker A. Nadimi Y. Dublyansky G. Koltai C. Spötl 2024-07-01T00:00:00Z https://doi.org/10.1029/2024GL109797 https://doaj.org/article/98e23acdf7f04d07a10c0a18cfb04927 EN eng Wiley https://doi.org/10.1029/2024GL109797 https://doaj.org/toc/0094-8276 https://doaj.org/toc/1944-8007 1944-8007 0094-8276 doi:10.1029/2024GL109797 https://doaj.org/article/98e23acdf7f04d07a10c0a18cfb04927 Geophysical Research Letters, Vol 51, Iss 13, Pp n/a-n/a (2024) paleoclimate speleothem Iran Marine Isotope Stage 3 Heinrich event 4 westerlies Geophysics. Cosmic physics QC801-809 article 2024 ftdoajarticles https://doi.org/10.1029/2024GL109797 2024-08-05T17:48:58Z Abstract The regional impact of abrupt glacial climate variability remains poorly constrained for arid southwestern Asia, particularly winter dynamics during Marine Isotope Stage 3, due to limited paleoarchives in the Middle East. Here, we present continuous speleothem records of δ18O and δ13C with robust chronologies for southwestern and central Iran, spanning ∼50–30 ka. Stable‐isotope signals in the two stalagmites are generally uncorrelated and do not exhibit a consistent response to Greenland stadials or interstadials; however, both show a positive δ18O excursion that coincides with Heinrich event 4. We explore the potential mechanisms for intermittent coupling of speleothem δ18O across Iran through isotope‐enabled atmospheric modeling outputs, from which we utilize the spatial δ18O gradient as a proxy for wintertime westerly versus southerly jet strength. Our results suggest that during Heinrich event 4 and several Greenland stadials, stronger westerly winds enhanced Mediterranean moisture contributions to both sites and reduced aridity in southern Iran. Article in Journal/Newspaper Greenland Directory of Open Access Journals: DOAJ Articles Geophysical Research Letters 51 13 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
paleoclimate speleothem Iran Marine Isotope Stage 3 Heinrich event 4 westerlies Geophysics. Cosmic physics QC801-809 |
spellingShingle |
paleoclimate speleothem Iran Marine Isotope Stage 3 Heinrich event 4 westerlies Geophysics. Cosmic physics QC801-809 M. Soleimani J. L. Baker A. Nadimi Y. Dublyansky G. Koltai C. Spötl Decoupled Hydroclimate of Central and Southwestern Iran Controlled by the Strength of Southerly‐Westerly Jets During Marine Isotope Stage 3 |
topic_facet |
paleoclimate speleothem Iran Marine Isotope Stage 3 Heinrich event 4 westerlies Geophysics. Cosmic physics QC801-809 |
description |
Abstract The regional impact of abrupt glacial climate variability remains poorly constrained for arid southwestern Asia, particularly winter dynamics during Marine Isotope Stage 3, due to limited paleoarchives in the Middle East. Here, we present continuous speleothem records of δ18O and δ13C with robust chronologies for southwestern and central Iran, spanning ∼50–30 ka. Stable‐isotope signals in the two stalagmites are generally uncorrelated and do not exhibit a consistent response to Greenland stadials or interstadials; however, both show a positive δ18O excursion that coincides with Heinrich event 4. We explore the potential mechanisms for intermittent coupling of speleothem δ18O across Iran through isotope‐enabled atmospheric modeling outputs, from which we utilize the spatial δ18O gradient as a proxy for wintertime westerly versus southerly jet strength. Our results suggest that during Heinrich event 4 and several Greenland stadials, stronger westerly winds enhanced Mediterranean moisture contributions to both sites and reduced aridity in southern Iran. |
format |
Article in Journal/Newspaper |
author |
M. Soleimani J. L. Baker A. Nadimi Y. Dublyansky G. Koltai C. Spötl |
author_facet |
M. Soleimani J. L. Baker A. Nadimi Y. Dublyansky G. Koltai C. Spötl |
author_sort |
M. Soleimani |
title |
Decoupled Hydroclimate of Central and Southwestern Iran Controlled by the Strength of Southerly‐Westerly Jets During Marine Isotope Stage 3 |
title_short |
Decoupled Hydroclimate of Central and Southwestern Iran Controlled by the Strength of Southerly‐Westerly Jets During Marine Isotope Stage 3 |
title_full |
Decoupled Hydroclimate of Central and Southwestern Iran Controlled by the Strength of Southerly‐Westerly Jets During Marine Isotope Stage 3 |
title_fullStr |
Decoupled Hydroclimate of Central and Southwestern Iran Controlled by the Strength of Southerly‐Westerly Jets During Marine Isotope Stage 3 |
title_full_unstemmed |
Decoupled Hydroclimate of Central and Southwestern Iran Controlled by the Strength of Southerly‐Westerly Jets During Marine Isotope Stage 3 |
title_sort |
decoupled hydroclimate of central and southwestern iran controlled by the strength of southerly‐westerly jets during marine isotope stage 3 |
publisher |
Wiley |
publishDate |
2024 |
url |
https://doi.org/10.1029/2024GL109797 https://doaj.org/article/98e23acdf7f04d07a10c0a18cfb04927 |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Geophysical Research Letters, Vol 51, Iss 13, Pp n/a-n/a (2024) |
op_relation |
https://doi.org/10.1029/2024GL109797 https://doaj.org/toc/0094-8276 https://doaj.org/toc/1944-8007 1944-8007 0094-8276 doi:10.1029/2024GL109797 https://doaj.org/article/98e23acdf7f04d07a10c0a18cfb04927 |
op_doi |
https://doi.org/10.1029/2024GL109797 |
container_title |
Geophysical Research Letters |
container_volume |
51 |
container_issue |
13 |
_version_ |
1810446812778070016 |