Seasonal Climatic Variations Inferred From Pollen in a Laminated Glacier in the Southeastern Tibetan Plateau. Issue 12 (28th November 2022)

• Record Type: Journal Article
• Authors: Cui, Anning; Wang, Mo; Lu, Houyuan; Xu, Baiqing; Xu, Deke; Li, Hao
• Is Part Of: Earth and space science. Volume 9:Issue 12(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-11-28
• Subjects: cryo‐palynology -- seasonal variation -- El Niño decaying phase -- southeastern Tibetan Plateau; Space sciences -- Periodicals; Geophysics -- Periodicals; 500.5
• DOI: 10.1029/2022EA002581
• Languages: English
• ISSNs: 2333-5084

Abstract

Abstract: A new, seasonal, laminated ice core pollen record spanning the last 13 years (2000–2012) from Zuoqiupu Glacier (5, 600 m a.s.l.), located on the southeastern Tibetan Plateau (TP), reveals clear variations in pollen concentration and assemblage. A total of 117 continuous ice core layers were used for pollen analysis. Samples with high concentrations of Pinus and Tsuga could be identified as layers accumulated in spring, samples with high concentrations of Alnus and Artemisia could be identified as layers accumulated in autumn, and samples rich in herbaceous plant pollen could be regarded as layers deposited in summer. Three peaks of Tsuga pollen concentration accompanied by high Pinus content occurred in the spring of 2003, 2007, and 2010, which corresponded to wetter and warmer conditions modulated by the El Niño decaying phase (April–May in 2003, 2007, and 2010). Thus, pollen grains deposited on the Zuoqiupu Glacier can be used to study the impacts of atmospheric circulations on seasonal climate change over the southeastern TP. Key Points: Pollen grains deposited on the Zuoqiupu Glacier can be used to determine seasonal ice core layers Three peaks of Tsuga pollen concentration occurred in 2003, 2007, and 2010, coinciding with wetter and warmer conditions in April The El Niño decaying phase caused wetter and warmer conditions in April over the southeastern Tibetan Plateau