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| Titel |
Late Cenozoic continuous aridification in the western Qaidam Basin: evidence from sporopollen records |
| VerfasserIn |
Y. F. Miao, X. M. Fang, F. L. Wu, M. T. Cai, C. H. Song, Q. Q. Meng, L. Xu |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 9, no. 4 ; Nr. 9, no. 4 (2013-08-09), S.1863-1877 |
| Datensatznummer |
250085202
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| Publikation (Nr.) |
 copernicus.org/cp-9-1863-2013.pdf |
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| Zusammenfassung |
| Cenozoic climate changes in inner Asia provide a basis for understanding
linkages between global cooling, the Tibetan Plateau uplift, and possibly the
development of the East Asian monsoon. Based on a compilation of
palynological results from the western Qaidam Basin, this study reconstructed
a 15-million-year (Ma) record of changing vegetation and paleoclimates
spanning the middle Miocene to present (comprising two series:
~ 18–5 Ma and ~ 3.1–0 Ma, respectively). The thermophilic
percentages were highest between 18 and 14 Ma, and decreased after 14 Ma,
closely corresponding to the Middle Miocene Climatic Optimum (MMCO) between
18 and 14 Ma and the following global climatic cooling between 14 and 5 Ma.
At the same time, decreases in the xerophytic and coniferous taxa
percentages, and the increasing logarithmic ratio of non-arboreal pollen to
arboreal pollen (ln (NAP/AP)), reveal the continuous aridification across
both the basin and surrounding mountains. Between ~ 3.1 and 0 Ma, the
percentages of the thermophilic, xerophytic and coniferous pollen as well as
the ln (NAP/AP) imply further cooling and drying in this region since
3.1 Ma. We argue that these vegetation and climate patterns during the late
Cenozoic western Qaidam Basin are primarily a result of the global cooling,
with the Tibetan Plateau uplift and East Asian summer monsoon having
contributions of lesser importance. |
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