Quaternary ecological responses and impacts of the Indian Ocean Summer Monsoon at Nam Co, Southern Tibetan Plateau

Günther, Franziska; Witt, Roman; Schouten, Stefan; Mäusbacher, Roland; Daut, Gerhard; Zhu, Liping; Xu, Bin; Yao, Tandong; Gleixner, Gerd

doi:10.1016/j.quascirev.2015.01.023

Cited by 64 publications

(45 citation statements)

References 80 publications

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“…The central TP has received moisture supply mainly from Indian Summer Monsoon (ISM) during the Holocene, according to observation on rainfall oxygen isotope (Yao et al, 2013) and numerous paleoclimate researches in the TP (e.g., Morrill et al, 2006;Bird et al, 2014;Günther et al, 2015). Multi-proxy paleomonsoon records from the ISM domains (Overpeck et al, 1996;Fleitmann et al, 2003;Gupta et al, 2003) and the TP (e.g., independent monsoon or precipitation proxies from Hong et al, 2003;and Günther et al, 2015) suggested that ISM and monsoonal precipitation remain maximum intensity during the early to mid-Holocene, and gradually weaken after mid-Holocene, and then slightly intensified in the late Holocene (Fig.…”

Section: Alpine Vegetation Successions In Response To Holocene Climatmentioning

confidence: 99%

“…Multi-proxy paleomonsoon records from the ISM domains (Overpeck et al, 1996;Fleitmann et al, 2003;Gupta et al, 2003) and the TP (e.g., independent monsoon or precipitation proxies from Hong et al, 2003;and Günther et al, 2015) suggested that ISM and monsoonal precipitation remain maximum intensity during the early to mid-Holocene, and gradually weaken after mid-Holocene, and then slightly intensified in the late Holocene (Fig. 5A).…”

Section: Alpine Vegetation Successions In Response To Holocene Climatmentioning

confidence: 99%

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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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Section: Alpine Vegetation Successions In Response To Holocene Climatmentioning

confidence: 99%

Section: Alpine Vegetation Successions In Response To Holocene Climatmentioning

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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“…The hydrogen isotope composition (δD) of terrestrial plant long-chain n-alkanes recovered from lacustrine sediments is emerging as a powerful proxy for paleoenvironmental reconstructions, especially for terrestrial hydrological changes (Sessions et al, 1999;Castañeda and Schouten, 2011;Wang et al, 2013;Bird et al, 2014;Schmidt et al, 2014;Günther et al, 2015). For example, for an 11000-year δD record of long-chain n-alkanes from Lake Paru Co on the southeastern Qinghai-Tibet Plateau (QTP), Bird et al (2014) interpreted the variability of this record as reflecting large-scale processes associated with regional Indian summer monsoon (ISM) dynamics.…”

Section: Introductionmentioning

confidence: 99%

“…10-5 ka and then ISM trended toward drier conditions to the present (Bird et al, 2014). Günther et al (2015) regarded δD values of C 29 n-alkanes (n-C 29 ) from the sediments of Lake Nam Co (QTP) as an appropriate paleohydrological proxy, displaying the influence of Indian Ocean summer monsoon in the Holocene. Their results showed that the interplay of different air masses seems to be primarily controlled by solar insolation in the investigated study areas.…”

Section: Introductionmentioning

confidence: 99%

Influence of aquatic plants on the hydrogen isotope composition of sedimentary long-chain n-alkanes in the Lake Qinghai region, Qinghai-Tibet Plateau

Liu

Yang

Wang

et al. 2016

Sci. China Earth Sci.

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The hydrogen isotopic composition (δD) of leaf wax long-chain n-alkanes (C 27 , C 29 , and C 31 ) from lacustrine sediments has been widely applied to reconstruct terrestrial paleoclimatic and paleohydrological changes. However, few studies have addressed whether the aquatic-derived n-alkanes can affect the δD values of lake sedimentary long-chain n-alkanes, which are usually regarded as a recorder of the terrestrial hydrological signals. Here we systematically investigated δD values of long-chain n-alkanes from modern aquatic plants, both near-shore and off-shore surface sediments, surrounding terrestrial plant litters, as well as river water and lake water in Lake Qinghai and its satellite lakes on the northeastern Qinghai-Tibet Plateau. Our data showed that (i) δD values of long-chain n-alkanes from aquatic plants varied from 184‰ to 132‰ for n-C 27 , from 183‰ to 138‰ for n-C 29 , and from 189‰ to 130‰ for n-C 31 , respectively, with no significant differences among the three n-alkanes homologues; (ii) δD values of long-chain n-alkanes from aquatic plants were generally more positive than those from surrounding terrestrial plants, possibly because that they recorded the D-enrichment of lake water in this semi-arid region; (iii) δD values of long-chain n-alkanes from surface sediments showed significant differences among the three n-alkanes homologues, due to the larger aquatic input of n-C 27 to the sedimentary lipid pool than that of n-C 31 , and (iv) n-C 27 δD values of near-shore aquatic plants and near-shore sediments are more negative than those from off-shore as a result of lower δD values of near-shore lake water. Our findings indicate that in this region (i) the offset between sedimentary n-C 27 and n-C 31 δD values (∆δD C27-C31 ) could potentially be used to evaluate if sedimentary long-chain n-alkanes are derived from a single source; (ii) while δD values of n-C 27 may be influenced by lake water hydrological changes, sedimentary n-C 31 is derived predominantly from terrestrial plants and thus its δD can serve as a relatively reliable indicator for terrestrial paleoclimatic and paleohydrological reconstructions.

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“…Because of the more equatorial position of the Intertropical Convergence Zone during the LGM (Chabangborn et al 2014;Günther et al 2015), the Indian Ocean Summer Monsoon (IOSM), which today provides moist air masses to the Tibetan Plateau, was much weaker (Barrows and Juggins 2005). As a consequence, the winter monsoon in the interior of the Tibetan Plateau, which is related to the interplay between the Siberian High and the mid-latitude Westerlies, is assumed to have been stronger because of the weaker thermal contrast between the Asian continent and the ocean (Shi 2002).…”

Section: Introductionmentioning

confidence: 99%

Biogeochemical evidence for freshwater periods during the Last Glacial Maximum recorded in lake sediments from Nam Co, south-central Tibetan Plateau

et al. 2015

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Improved knowledge of deglaciation processes during the termination of the Last Glacial Maximum on the Tibetan Plateau can provide important information for understanding deglaciations in climate-sensitive high-altitude ecosystems. Little, however, is known about this time interval because most lacustrine sediment records from the Tibetan Plateau are younger than 19,000 years. This study focused on a lake sediment record from Nam Co, south-central Tibetan Plateau, covering the interval from *23.7 to 20.9 cal ka BP. We analysed the distribution and compound-specific hydrogen isotope composition (dD) of sedimentary n-alkanes, as well as the bulk sediment TOC, TN, d13 C org and d 15 N composition, to infer lake system development. Pronounced changes in environmental conditions between *21.6 and 21.1 cal ka BP, as well as between 23.1 and 22.5 cal ka BP (Greenland Interstadial 2), were inferred from increased aquatic nalkane amounts and decreased dD n-C23 values within these time intervals, respectively. Freshwater inputs, which most likely resulted from enhanced glacier melting, caused these changes. Our results suggest that mountain glacier retreat on the Tibetan Plateau started earlier than previously assumed. The required energy for thawing was probably provided by temperature changes caused by reorganization of atmospheric circulation, which has also been recorded in Greenland ice records.

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Quaternary ecological responses and impacts of the Indian Ocean Summer Monsoon at Nam Co, Southern Tibetan Plateau

Cited by 64 publications

References 80 publications

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

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

Influence of aquatic plants on the hydrogen isotope composition of sedimentary long-chain n-alkanes in the Lake Qinghai region, Qinghai-Tibet Plateau

Biogeochemical evidence for freshwater periods during the Last Glacial Maximum recorded in lake sediments from Nam Co, south-central Tibetan Plateau

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