Phenology and Climatic Regime Inferred from Airborne Pollen on the Northern Slope of the Qomolangma (Everest) Region

Lü, Xianguo; Paudayal, Khum N.; Uhl, Dieter; Zhu, Liping; Mosbrugger, Volker

doi:10.1029/2020jd033405

Cited by 14 publications

(6 citation statements)

References 49 publications

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“…Besides Tsuga pollen, other airborne pollen grains such as Pinus , Betula and Alnus were found in our modern samples (Figure S3 in Supporting Information ), which can also be transported by air masses from the forested areas to the interior of the TP (Cour et al., 1999; Li et al., 2020; Lü et al., 2020; Ma et al., 2017). However, Pinus and Betula are distributed not only in the southern‐eastern Himalayas and the southeastern TP, but also in the western Himalayas (https://www.gbif.org/).…”

Section: Resultsmentioning

confidence: 91%

Variations in Spring Atmospheric Circulation on the Southwestern Tibetan Plateau During Holocene Linked to High‐ and Low‐Latitude Forcing

Zhu

Wang

et al. 2023

Geophysical Research Letters

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Reconstructing paleo-atmospheric circulations can improve our understanding of climate change and its driving mechanisms, and serve as the reference for predicting the future climate change (Jiang & Guo, 2013). The Tibetan Plateau (TP) and its surroundings, commonly referred to as the "Third Pole," has a sensitive response to global change, where climate change and its relations to atmospheric circulations at different time scales have attracted much attention (Yao et al., 2013;Zhu et al., 2015). Observations and simulations of the precipitation stable isotope revealed that the Indian summer monsoon (ISM) mainly affected the southern and southeastern TP in summer, and the Westerlies controlled the most portions of the TP in winter (Yao et al., 2013). From a seasonal perspective, previous proxy-based reconstructions and model simulations mainly focus on summer and/or winter changes in the atmospheric circulation (Ramisch et al., 2016;Wang et al., 2018), but rarely address the variations in the transitional seasons (spring/autumn).The springtime atmospheric circulation over the TP and its surroundings is now characterized by a transition pattern from winter-type to summer-type (Schiemann et al., 2009). This pattern involves a shift of the Westerlies from the south of the TP to the north, and a shift of the meridional circulation between the TP and low latitudes changes from the Hadley circulation to the monsoon circulation. Influenced by the variations in the atmospheric circulations, the current spring precipitation of the TP increased significantly but showed regional differences (Shen et al., 2015), which altered the starting date of the vegetation growing season (Shen et al., 2015) and mediated the shift rates of the alpine tree lines (Sigdel et al., 2018). Therefore, reconstructing the variations in the spring atmospheric circulation of the TP can improve our understanding of changes in climate and ecology.

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Section: Resultsmentioning

confidence: 91%

Variations in Spring Atmospheric Circulation on the Southwestern Tibetan Plateau During Holocene Linked to High‐ and Low‐Latitude Forcing

Zhu

Wang

et al. 2023

Geophysical Research Letters

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“…1999; Lu et al . 2010, 2020), we use the HYSPLIT model to analyse the airflow trajectory characteristics of different seasons and different levels above the ground in the alpine meadow and alpine steppe zones. The modelled interval was from March 2020 to February 2021, and we used 15 April (spring), 15 July (summer), 15 October (autumn) and 15 January (winter) as typical days for different seasons.…”

Section: Resultsmentioning

confidence: 99%

Modern pollen assemblages from the hinterland of the Tibetan Plateau and their significance for reconstructions of past vegetation

Ma,

Li,

et al. 2023

Boreas

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We conducted a detailed field vegetation investigation combined with the collection of surface soil samples for pollen analysis in the alpine meadow and steppe vegetation zones (30 sites in each zone) in the hinterland of the Tibetan Plateau. Our objectives were to determine the source area of exotic pollen, the relationship between pollen percentages and the cover of the major plant taxa, and the characteristics of the pollen assemblages from surface soils and lake sediments and their vegetation significance. Our principal findings are: (i) the two vegetation zones are herbaceous although arboreal pollen types are present in the related pollen assemblages (2 and 16.8% in the alpine meadow and steppe zones, respectively); (ii) arboreal pollen is assumed to be transported mainly by the Indian monsoon from the forests of the southern Himalayan foothills or river valleys – the spatial distribution of the percentages and concentrations of arboreal pollen in the study sites shows that pollen concentrations have the strongest correlation with the Indian monsoon's variations; (iii) there are regional differences in (a) the relationship between pollen percentages and the cover of the main plant taxa and (b) the indicator plant taxa representative of pollen assemblages and vegetation types zones – the regional vegetation of the study region and pollen productivity variations between plant taxa are likely to be the main causes behind these differences; and (iv) the pollen assemblages from surface soils and lake sediments have similar characteristics and correspond well to the regional vegetation of the alpine meadow zone. In the alpine steppe zone, the pollen assemblages from surface soils and lake sediments are quite different, caused mainly by the over‐representation of Artemisia. Our study supplies a detailed description of pollen–vegetation relationships on the hinterland of the Tibetan Plateau and provides scientific references for interpreting stratigraphic pollen assemblages and reconstructing regional vegetation.

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“…Additionally, herbaceous plants usually bloom in summer or autumn. Poaceae and Cyperaceae have similar flowering periods between May and August/September, Chenopodiaceae usually bloom from July to September, and Artemisia blooms from early July to the end of September (Editorial Board of the Flora of China, 2010; Lü et al., 2020; Malla et al., 1986; Yang et al., 2009).…”

Section: Study Area and Methodsmentioning

confidence: 99%

Seasonal Climatic Variations Inferred From Pollen in a Laminated Glacier in the Southeastern Tibetan Plateau

Wang

et al. 2022

Earth and Space Science

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As the dominant ocean-atmosphere coupled mode of interannual variability in the climate system, the El Niño-Southern Oscillation (ENSO) exhibits notable impacts through atmospheric teleconnections on the climate record in alpine glaciers. Pollen collected from snow samples on the Quelccaya Ice Cap had high concentrations during the La Niña years and low concentrations during the El Niño years (Reese & Liu, 2005). Annually resolved pollen records from the Sajama Ice Cap indicated high pollen concentrations during El Niño years, which was attributed to increased sublimation (Liu et al., 2007). The pollen and chemical records extracted from ice cores recovered from Nevado Coropuna Mountain revealed two high concentration peaks associated with El Niño events in 1982 -1983 and 1992(Herreros et al., 2009.The Tibetan Plateau (TP) is the largest alpine glacier preservation area in the world. The interannual climate changes recorded in ice cores from the northern TP to the southern TP are modulated by ENSO conditions. Yang et al. (2000) found that negative precipitation anomalies were associated with El Niño years in cores from the Guliya Ice Cap. Yang et al. (2018) suggested that eight of 10 noticeably strong El Niño events corresponded to δ 18 O depletion events in Kuokuosele and Mutztagata ice cores extracted from the Pamir Plateau. Wang et al. (2003) showed that the air temperature during the warm season, as recorded by δ 18 O, retrieved from an ice

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Phenology and Climatic Regime Inferred from Airborne Pollen on the Northern Slope of the Qomolangma (Everest) Region

Cited by 14 publications

References 49 publications

Variations in Spring Atmospheric Circulation on the Southwestern Tibetan Plateau During Holocene Linked to High‐ and Low‐Latitude Forcing

Variations in Spring Atmospheric Circulation on the Southwestern Tibetan Plateau During Holocene Linked to High‐ and Low‐Latitude Forcing

Modern pollen assemblages from the hinterland of the Tibetan Plateau and their significance for reconstructions of past vegetation

Seasonal Climatic Variations Inferred From Pollen in a Laminated Glacier in the Southeastern Tibetan Plateau

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