The Lateglacial interstadial at the southeastern limit of the Sonoran Desert, Mexico: vegetation and climate reconstruction based on pollen sequences from Ciénega San Marcial and comparison with the subrecent record
The last glacial–interglacial transition encompassed rapid climate oscillations that affected both hemispheres. At low latitudes, the pattern of oscillations is not well established. To address this issue, pollen analysis was performed at Ciénega San Marcial, a monsoon‐influenced site located on the...
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crwiley:10.1111/bor.12188 2024-09-09T19:57:54+00:00 The Lateglacial interstadial at the southeastern limit of the Sonoran Desert, Mexico: vegetation and climate reconstruction based on pollen sequences from Ciénega San Marcial and comparison with the subrecent record Ortega‐Rosas, Carmen I. Peñalba, María C. Guiot, Joel Consejo Nacional de Ciencia y Tecnología 2016 http://dx.doi.org/10.1111/bor.12188 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fbor.12188 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bor.12188 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Boreas volume 45, issue 4, page 773-789 ISSN 0300-9483 1502-3885 journal-article 2016 crwiley https://doi.org/10.1111/bor.12188 2024-06-20T04:27:22Z The last glacial–interglacial transition encompassed rapid climate oscillations that affected both hemispheres. At low latitudes, the pattern of oscillations is not well established. To address this issue, pollen analysis was performed at Ciénega San Marcial, a monsoon‐influenced site located on the southeastern edge of the Sonoran Desert at the limit of the tropical thornscrub. The pollen record covers the Late Wisconsinan glacial termination II , from 15 650 to 13 400 cal. a BP , including GS ‐2 and the Lateglacial interstadial, and a recent historical period ( AD c. 1919 to 2004). We applied the modern analogue technique, in which pollen taxa are assigned to plant functional types ( PFT s), to reconstruct the past climates. At the end of GS ‐2, a Juniperus–Pinus woodland is indicative of annual temperatures 10±2 °C colder than present and higher annual precipitation dominated by winter rains. The onset of the Lateglacial interstadial occurs at c. 15 500 cal. a BP , resulting in a lower sedimentation rate and the spread of a xeric grassland. This period is associated with an increase in summer insolation. A weak signal of summer monsoon intensification is dated to 14 825 cal. a BP but is associated with colder winter temperatures. A wider spread of tropical taxa occurs after 13 800 cal. a BP , along with the loss of Juniperus , suggesting a temperature increase of approximately 3 °C. In spite of the earlier Lateglacial warming, the transition from glacial to interstadial conditions seems to be related to North Atlantic atmospheric variations. We conclude that during the last glacial–interglacial transition, the Sonoran Desert at 28.5° latitude was sensitive to climate variations originating in northern latitudes. The recent historical sequence displays summer‐dominant precipitation and additional drivers of climate change, including anthropogenic factors and El Niño, thus showing a stronger Pacific circulation influence in the subrecent period. Article in Journal/Newspaper North Atlantic Wiley Online Library Pacific Boreas 45 4 773 789 |
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Wiley Online Library |
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crwiley |
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English |
description |
The last glacial–interglacial transition encompassed rapid climate oscillations that affected both hemispheres. At low latitudes, the pattern of oscillations is not well established. To address this issue, pollen analysis was performed at Ciénega San Marcial, a monsoon‐influenced site located on the southeastern edge of the Sonoran Desert at the limit of the tropical thornscrub. The pollen record covers the Late Wisconsinan glacial termination II , from 15 650 to 13 400 cal. a BP , including GS ‐2 and the Lateglacial interstadial, and a recent historical period ( AD c. 1919 to 2004). We applied the modern analogue technique, in which pollen taxa are assigned to plant functional types ( PFT s), to reconstruct the past climates. At the end of GS ‐2, a Juniperus–Pinus woodland is indicative of annual temperatures 10±2 °C colder than present and higher annual precipitation dominated by winter rains. The onset of the Lateglacial interstadial occurs at c. 15 500 cal. a BP , resulting in a lower sedimentation rate and the spread of a xeric grassland. This period is associated with an increase in summer insolation. A weak signal of summer monsoon intensification is dated to 14 825 cal. a BP but is associated with colder winter temperatures. A wider spread of tropical taxa occurs after 13 800 cal. a BP , along with the loss of Juniperus , suggesting a temperature increase of approximately 3 °C. In spite of the earlier Lateglacial warming, the transition from glacial to interstadial conditions seems to be related to North Atlantic atmospheric variations. We conclude that during the last glacial–interglacial transition, the Sonoran Desert at 28.5° latitude was sensitive to climate variations originating in northern latitudes. The recent historical sequence displays summer‐dominant precipitation and additional drivers of climate change, including anthropogenic factors and El Niño, thus showing a stronger Pacific circulation influence in the subrecent period. |
author2 |
Consejo Nacional de Ciencia y Tecnología |
format |
Article in Journal/Newspaper |
author |
Ortega‐Rosas, Carmen I. Peñalba, María C. Guiot, Joel |
spellingShingle |
Ortega‐Rosas, Carmen I. Peñalba, María C. Guiot, Joel The Lateglacial interstadial at the southeastern limit of the Sonoran Desert, Mexico: vegetation and climate reconstruction based on pollen sequences from Ciénega San Marcial and comparison with the subrecent record |
author_facet |
Ortega‐Rosas, Carmen I. Peñalba, María C. Guiot, Joel |
author_sort |
Ortega‐Rosas, Carmen I. |
title |
The Lateglacial interstadial at the southeastern limit of the Sonoran Desert, Mexico: vegetation and climate reconstruction based on pollen sequences from Ciénega San Marcial and comparison with the subrecent record |
title_short |
The Lateglacial interstadial at the southeastern limit of the Sonoran Desert, Mexico: vegetation and climate reconstruction based on pollen sequences from Ciénega San Marcial and comparison with the subrecent record |
title_full |
The Lateglacial interstadial at the southeastern limit of the Sonoran Desert, Mexico: vegetation and climate reconstruction based on pollen sequences from Ciénega San Marcial and comparison with the subrecent record |
title_fullStr |
The Lateglacial interstadial at the southeastern limit of the Sonoran Desert, Mexico: vegetation and climate reconstruction based on pollen sequences from Ciénega San Marcial and comparison with the subrecent record |
title_full_unstemmed |
The Lateglacial interstadial at the southeastern limit of the Sonoran Desert, Mexico: vegetation and climate reconstruction based on pollen sequences from Ciénega San Marcial and comparison with the subrecent record |
title_sort |
lateglacial interstadial at the southeastern limit of the sonoran desert, mexico: vegetation and climate reconstruction based on pollen sequences from ciénega san marcial and comparison with the subrecent record |
publisher |
Wiley |
publishDate |
2016 |
url |
http://dx.doi.org/10.1111/bor.12188 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fbor.12188 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bor.12188 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Boreas volume 45, issue 4, page 773-789 ISSN 0300-9483 1502-3885 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/bor.12188 |
container_title |
Boreas |
container_volume |
45 |
container_issue |
4 |
container_start_page |
773 |
op_container_end_page |
789 |
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1809928869778554880 |