Holocene treeline shifts and monsoon variability in the Hengduan Mountains (southeastern Tibetan Plateau), implications from palynological investigations

Kramer, Annette; Herzschuh, Ulrike; Mischke, Steffen; Zhang, Chengjun

doi:10.1016/j.palaeo.2009.12.001

Cited by 145 publications

(143 citation statements)

References 116 publications

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“…The core was sub-sampled at 1 cm contiguous intervals and stored at 4 • C prior to analysis. The chronology is based on accelerator mass spectrometry (AMS) 14 C dates from terrestrial plant macrofossils ex- (Shakun et al, 2007); 2, Qunf Cave (Fleitmann et al, 2003); 3, Hoti Cave ; 4, Lonar Lake (Prasad et al, 2014;Sarkar et al, 2015); 5, Core SO188-342KL (Contreras-Rosales et al, 2014); 6, Tso Kar (Demske et al, 2009); 7, Tianmen Cave 8, Paru Co (Bird et al, 2014); 9, Gonghe Basin (Liu et al, 2013); 10, Gulang profile (Sun et al, 2012); 11, Jingyuan profile (Sun et al, 2012); 12, Naleng Lake (Kramer et al, 2010); 13, Tiancai Lake (Xiao et al, 2014b); 14, Xingyun Lake (Chen et al, 2014); 15, Huguangyan Lake (Jia et al, 2015;Wang et al, 2012); 16, Core MD05-2904 ; 17, Core MD01-2390 (Steinke et al, 2010). (b) Expanded view of the study area.…”

Section: Sediment Sampling and Datingmentioning

confidence: 99%

“…During the last two decades, the variability of the Indian summer monsoon (ISM) in the Holocene has been reconstructed from various types of paleoclimatic archive and proxies, such as stalagmite oxygen isotope (δ 18 O) records Fleitmann et al, 2003, marine sediments (Contreras-Rosales et al, 2014;Gupta et al, 2003;Rashid et al, 2007), and lake and peatland sediments (Bird et al, 2014;Chen et al, 2014;Cook et al, 2013;Demske et al, 2009;Fuchs and Buerkert, 2008;Jarvis, 1993;Kramer et al, 2010;Prasad et al, 2014;Sarkar et al, 2015;C. Shen et al, 2006;J.…”

Section: Introductionmentioning

confidence: 99%

“…Modern pollen data indicate that the mean temperature of the coldest month and annual precipitation are the dominant climatic variables of modern pollen/vegetation distributions in South China (Li et al, 2015). Pollen analysis has been widely used to reconstruct Holocene paleovegetation and paleoclimate in the region (Chen et al, 2014;Cook et al, 2013;Jarvis, 1993;Kramer et al, 2010;C. Shen et al, 2006;Song et al, 2012;Xiao et al, 2014a).…”

Section: Introductionmentioning

confidence: 99%

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Holocene Asian monsoon evolution revealed by a pollen record from an alpine lake on the southeastern margin of the Qinghai–Tibetan Plateau, China

et al. 2016

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Abstract. We present the results of pollen analyses from a 1105 cm long sediment core from Wuxu Lake in southwestern China, which depict the variations of the East Asian winter monsoon (EAWM) and the Indian summer monsoon (ISM) during the last 12.3 ka. During the period of 12.3 to 11.3 cal ka BP, the dominance of Betula forest and open alpine shrub and meadow around Wuxu Lake indicates a climate with relatively cold winters and dry summers, corresponding to the Younger Dryas event. Between 11.3 and 10.4 cal ka BP, further expansion of Betula forest and the retreat of alpine shrubs and meadows reflect a greater seasonality with cold winters and gradually increasing summer precipitation. From 10.4 to 4.9 cal ka BP, the dense forest understory, together with the gradual decrease in Betula forest and increase in Tsuga forest, suggest that the winters became warmer and summer precipitation was at a maximum, corresponding to the Holocene climatic optimum. Between 4.9 and 2.6 cal ka BP, Tsuga forest and alpine shrubs and meadows expanded significantly, reflecting relatively warm winters and decreased summer precipitation. Since 2.6 cal ka BP, reforestation around Wuxu Lake indicates a renewed humid period in the late Holocene; however, the vegetation in the catchment may also have been affected by grazing activity during this period. The results of our study are generally consistent with previous findings; however, the timing and duration of the Holocene climatic optimum from different records are inconsistent, reflecting real contrast in local rainfall response to the ISM. Overall, the EAWM is broadly inphase with the ISM on the orbital timescale, and both monsoons exhibit a trend of decreasing strength from the early to late Holocene, reflecting the interplay of solar insolation receipt between the winter and summer seasons and El Niño-Southern Oscillation strength in the tropical Pacific.

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Section: Sediment Sampling and Datingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Holocene Asian monsoon evolution revealed by a pollen record from an alpine lake on the southeastern margin of the Qinghai–Tibetan Plateau, China

et al. 2016

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“…The region with the strongest disagreement between the model and the reconstructions (100-110°E, 30-40°N) is located at the eastern slopes and foothills of the Tibetan Plateau and the adjacent regions of the Loess Plateau where altitudes vary on a small spatial scale. Thus, the patchiness of the moisture reconstruction may to some extent be an imprint of the local topography that may lead to local climate differences and for example unevenly affects pollen records by upward pollen transport (Kramer et al 2010). …”

Section: Implications For the Moisture Reconstructionsmentioning

confidence: 99%

Spatial variability of Holocene changes in the annual precipitation pattern: a model-data synthesis for the Asian monsoon region

et al. 2012

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This study provides a detailed analysis of the mid-Holocene to present-day precipitation change in the Asian monsoon region. We compare for the first time results of high resolution climate model simulations with a standardised set of mid-Holocene moisture reconstructions. Changes in the simulated summer monsoon characteristics (onset, withdrawal, length and associated rainfall) and the mechanisms causing the Holocene precipitation changes are investigated. According to the model, most parts of the Indian subcontinent received more precipitation (up to 5 mm/day) at mid-Holocene than at present-day. This is related to a stronger Indian summer monsoon accompanied by an intensified vertically integrated moisture flux convergence. The East Asian monsoon region exhibits local inhomogeneities in the simulated annual precipitation signal. The sign of this signal depends on the balance of decreased pre-monsoon and increased monsoon precipitation at mid-Holocene compared to present-day. Hence, rainfall changes in the East Asian monsoon domain are not solely associated with modifications in the summer monsoon circulation but also depend on changes in the mid-latitudinal westerly wind system that dominates the circulation during the pre-monsoon season. The proxybased climate reconstructions confirm the regional dissimilarities in the annual precipitation signal and agree well with the model results. Our results highlight the importance of including the pre-monsoon season in climate studies of the Asian monsoon system and point out the complex response of this system to the Holocene insolation forcing. The comparison with a coarse climate model simulation reveals that this complex response can only be resolved in high resolution simulations.

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“…The effect of climate changes on landscape dynamics can be investigated on geomorphic features deposited or produced during the Late Glacial Maximum or Holocene period (Kramer et al 2010), when a dramatic temperature increase was recorded within a relatively short time interval . That situation was similar to what is happening nowadays in lands with similar climate and contextual challenges such as North America, Australia (Snowy Mountains) and New Zealand.…”

Section: Background and Aimsmentioning

confidence: 99%

Climate change impacts on the Alpine ecosystem: an overview with focus on the soil

Chersich¹,

Rejšek²,

Vranová³

et al. 2015

J. For. Sci.

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ABSTRACT:The Alpine ecosystem is very sensitive to climatic changes, which have an influence on glaciers, snow, vegetation and soils. The aim of this review is to illustrate the effects of global change on the Alpine soil ecosystem, which is an optimal marker to record them. The manuscript enhances our understanding of the global change effect on the Alpine environment: on morphology, on ice, on vegetation and points out how the cycles of soil nutrients equilibrium have been changed with a direct effect on soils that support plant species. The changes in cryosphere, glacier reduction and periglacial environment as glaciers retreat, decrease in the snow cover extent and earlier snowmelt, determine an effect on soils (on the structure, organic matter and humus forms, soil processes and soil types) from the top of the Alpine horizon to the bottom. The processes induced by climate change (such as erosion and tree line shifting) have a direct effect on water balance that can be observed on soil profile characters with an effect on upward migration, change in phenology, extensive losses of species. The equilibrium of the biogeochemical cycles has been changed and this has a direct effect on soils that support plant species.

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Holocene treeline shifts and monsoon variability in the Hengduan Mountains (southeastern Tibetan Plateau), implications from palynological investigations

Cited by 145 publications

References 116 publications

Holocene Asian monsoon evolution revealed by a pollen record from an alpine lake on the southeastern margin of the Qinghai–Tibetan Plateau, China

Holocene Asian monsoon evolution revealed by a pollen record from an alpine lake on the southeastern margin of the Qinghai–Tibetan Plateau, China

Spatial variability of Holocene changes in the annual precipitation pattern: a model-data synthesis for the Asian monsoon region

Climate change impacts on the Alpine ecosystem: an overview with focus on the soil

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