Quantitative climate and vegetation trends since the late glacial on the northeastern Tibetan Plateau deduced from Koucha Lake pollen spectra

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

doi:10.1016/j.yqres.2008.09.003

Cited by 168 publications

(100 citation statements)

References 48 publications

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“…However, some records also show comparably dry and even drier conditions in the mid-Holocene affecting the local vegetation composition Herzschuh et al, 2009). This inhomogeneous land cover trend is also obvious in the model results.…”

Section: Land Cover Change From 6 K To Present-daymentioning

confidence: 99%

Contribution of oceanic and vegetation feedbacks to Holocene climate change in monsoonal Asia

2010

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Abstract.The impact of vegetation-atmosphere and ocean-atmosphere interactions on the mid-to late Holocene climate change as well as their synergy is studied for different parts of the Asian monsoon region, giving consideration to the large climatic and topographical heterogeneity in that area. We concentrate on temperature and precipitation changes as the main parameters describing monsoonal influenced climates.For our purpose, we analyse a set of coupled numerical experiments, performed with the comprehensive Earth system model ECHAM5/JSBACH-MPIOM under present-day and mid-Holocene (6 k) orbital configurations (Otto et al., 2009b). The temperature change caused by the insolation forcing reveals an enhanced seasonal cycle, with a pronounced warming in summer (0.58 K) and autumn (1.29 K) and a cooling in the other seasons (spring: −1.32 K; winter: −0.97 K). Most of this change can be attributed to the direct response of the atmosphere, but the ocean, whose reaction has a lagged seasonal cycle (warming in autumn and winter, cooling in the other seasons), strongly modifies the signal. The simulated contribution of dynamic vegetation is small and most effective in winter, where it slightly warms the near-surface atmosphere (approx. 0.03 K). The temperature difference attributed to the synergy is on average positive, but also small. Concerning the precipitation, the most remarkable change is the postponement and enhancement of the Asian monsoon (0.46 mm/day in summer, 0.53 mm/day in autumn), mainly related to the direct atmospheric response. On regional average, the interactive ocean (ca. 0.18 mm/day) amplifies Correspondence to: A. Dallmeyer (anne.dallmeyer@zmaw.de) the direct effect, but tends to weaken the East Asian summer monsoon and strongly increases the Indian summer monsoon rainfall rate (0.68 mm/day). The influence of dynamic vegetation on precipitation is comparatively small (<0.04 mm/day). The synergy effect has no influence, on average.

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Section: Land Cover Change From 6 K To Present-daymentioning

confidence: 99%

Contribution of oceanic and vegetation feedbacks to Holocene climate change in monsoonal Asia

2010

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“…Accordingly, lake sediments are being widely and thoroughly studied in this area, because there are more than 1000 lakes with areas greater than 1 km 2 present on the plateau [7]. Although these lakes provide many natural environmental archives for past environmental changes [8][9][10][11][12][13][14], the explanations of the proxies are still based on lake studies of the lowland or other areas. However, for lakes with complicated sedimentary environments, especially large lakes, it is essential to under-stand the spatial distribution and enrichment conditions of sediments when reconstructing the paleoclimate and paleoenvironment [15,16].…”

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confidence: 99%

The spatial distribution and sedimentary processes of organic matter in surface sediments of Nam Co, Central Tibetan Plateau

et al. 2012

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In this study, 67 surface sediment samples collected from Nam Co in central Tibet were analyzed for total carbon, total organic carbon and total nitrogen, and 51 of these samples were also analyzed for n-alkanes. The origin and spatial distribution of organic matter were then investigated using these proxies, and the control factors responsible for the spatial distribution patterns and paleolimnological significance were discussed. The results indicated that the origin of organic matter in surface sediment of Nam Co is consistent with the sources of n-alkanes, which were primarily submerged plants, followed by terrestrial plants, and then aquatic algae and bacteria. The organic matter in surface sediments of the lake showed typical spatial variability. Because of the great influence of underwater topography, river inputs and water quality, the spatial distribution of organic matter is enriched from the source to the deposit center. This spatial variability of organic matter in the lake indicates that the sediments in different areas have different sensitivities to environmental changes, which is important to reconstruction of paleoenvironments and paleoclimate using lake sediment cores.Tibetan Plateau, Nam Co, surface sediments, spatial distribution, sedimentary processes Citation:Wang Y, Zhu L P, Wang J B, et al. The spatial distribution and sedimentary processes of organic matter in surface sediments

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“…Palynological research has figured some patterns of vegetation change in the central TP, including: 1) Alpine meadow had expanded westwards at the expense of alpine steppe and temperate steppe since the mid-Holocene (Shen, 2003;Herzschuh et al, 2009). 2) Vegetation changed from Artemisia-rich steppe to Cyperaceae-dominated steppe in the mid-Holocene as documented by pollen spectra in Lake Zigetang .…”

Section: Introductionmentioning

confidence: 99%

“…For example, precipitation changes may have played a major role in the westward shifts of alpine meadow in Co Ngion area (Shen et al, 2008), and in the vegetation change from temperate steppe to alpine meadow in Koucha area (Herzschuh et al, 2009). However, temperature is also assumed to be responsible for vegetation transition between alpine meadow and forest (Zhao et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Vegetation successions in response to Holocene climate changes in the central Tibetan Plateau

Lü

Shen

et al. 2016

Journal of Arid Environments

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a b s t r a c tAlpine vegetation in the central Tibetan Plateau is vulnerable to climate change. Nine lacustrine pollen records with well-constrained chronologies and high-resolution data were reviewed to document regional and local patterns of alpine vegetation succession in this region, and to understand the climatic driving forces for these changes. According to the relationship between modern pollen distribution and climate condition in the central Tibetan Plateau, Cyperaceae is a moisture-favored and cold-resistant component in both the vegetation and pollen assemblages in the region, while Artemisia is a droughttolerant and temperate component. Within an eastewest transect across contemporary alpine steppe zone and alpine meadow zone of the central Tibetan Plateau, Kobresia (Cyperaceae)-dominated alpine meadow expanded westwards to invade the alpine steppe (dominated by Artemisia and Poaceae), and to replace the Artemisia-rich temperate steppe on a regional scale during the mid-Holocene, probably driven by the enhanced precipitation. Vegetation within a southenorth transect, covered by alpine steppe and temperate steppe, underwent a turnover in steppe composition from a predominance of Artemisia during the first half of the Holocene to a predominance of Cyperaceae in the latter half on a regional scale, caused by a decline in the temperature. Furthermore, altitudinal vegetation belts in the central Tibetan Plateau shifted downwards in response to cooling climate since the early Holocene. Therefore, monsoonal precipitation and insolation-driven temperature changes may be the key climate driving forces for the Holocene vegetation successions in the central Tibetan Plateau.

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Quantitative climate and vegetation trends since the late glacial on the northeastern Tibetan Plateau deduced from Koucha Lake pollen spectra

Cited by 168 publications

References 48 publications

Contribution of oceanic and vegetation feedbacks to Holocene climate change in monsoonal Asia

Contribution of oceanic and vegetation feedbacks to Holocene climate change in monsoonal Asia

The spatial distribution and sedimentary processes of organic matter in surface sediments of Nam Co, Central Tibetan Plateau

Vegetation successions in response to Holocene climate changes in the central Tibetan Plateau

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