Humification degrees of peat in Qinghai-Xizang Plateau and palaeoclimate change

Wang, Hua; Hong, Youwei; Zhu, Yongxuan; Hong, Bing; Lin, Qingyu; Xu, Hai; Leng, Xuetian; Mao, Xumei

doi:10.1007/bf02900974

Cited by 36 publications

(16 citation statements)

References 22 publications

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“…Experiment shows that humification has a positive correlation to both temperature and soil wetness when the temperature is lower than 30℃ and the soil wetness is lower than 80% [19] . So peat humification is commonly used as a climatic proxy [13,14,21,22] for discussing the intensity of summer monsoon. Humification determination is by the method provided by ACCROTELM (Abrupt climate changes recorded over the European land mass).…”

Section: Monsoon Proxies and Methodsmentioning

confidence: 99%

“…The peat sediment was later subsampled every 1 cm in the laboratory. The material used in this study is much longer than that in those studies before [6,8,12,13] , so, it is therefore much suitable for high-resolution palaeoclimate research.…”

Section: Materials and Chronologymentioning

confidence: 97%

“…Hong et al have done great fruitful work on Hongyuan peat bog in the eastern Tibetan Plateau [6,8,13] . Carbon isotope ratio and oxygen isotope ratio of peat cellulose were used to show the figure of climatic change during the Holocene in the Hongyuan region [6,8] .…”

mentioning

confidence: 99%

“…Carbon isotope ratio of Carex mulieensis cellulose in peat sediment was related to the precipitation variations during the Holocene in this region, which can be correlated to the ice rafted debris (IRD) events in the Northern Atlantic Ocean [6] . Wang et al used peat humification proxy in this region to reconstruct environmental conditions [13] . Zhou et al focused on the pretreatment of peat samples for AMS 14 C dating to establish reliable chronological framework; they also used TOC and grayscale as climatic proxies to reflect environmental changes [12] .…”

mentioning

confidence: 99%

“…Analysis on the plant macrofossil [1] , pollen [2][3][4] , isotope ratio [5][6][7][8][9] , element content [10,11] , total organic carbon (TOC) [12] , humification [13,14] and grayscale [12] for peat sediment has shown its superiorities as a recorder medium for reconstructing the Holocene climate.…”

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confidence: 99%

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High-resolution peat records for Holocene monsoon history in the eastern Tibetan Plateau

Zhou

Franzén

et al. 2006

SCI CHINA SER D

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The variations of summer and winter monsoons during the Holocene in the eastern Tibetan Plateau are shown to follow two basic models based on the reliable dating and high-resolution monsoon proxies determinations, one being a synchronous model in that both summer and winter monsoons are strengthening or decreasing, and the other to form a complementary pattern. These two different patterns evenly interact with each other on different time scales and together compose a complicated monsoon climatic model in this region. The climatic condition integrated by winter and summer monsoons is synchronous to the global pattern, which also shows the instability of the Holocene climate on centennial-millennial timescale. The abrupt monsoon event in about 6.2 ka cal. BP is much more severe than that in ca. 8.0 ka cal. BP, which indicates the regional character of the Asian monsoon and that the Asian monsoon climate is indeed a window on the global climate system.

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Section: Monsoon Proxies and Methodsmentioning

confidence: 99%

Section: Materials and Chronologymentioning

confidence: 97%

mentioning

confidence: 99%

mentioning

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confidence: 99%

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High-resolution peat records for Holocene monsoon history in the eastern Tibetan Plateau

Zhou

Franzén

et al. 2006

SCI CHINA SER D

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Climatic changes since the last deglaciation inferred from a lacustrine sedimentary sequence in the eastern Nanling Mountains, south China

Wei

Xue

Zheng

et al. 2010

J Quaternary Science

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Two sediment cores recovered from Dahu Swamp, which is located in eastern Nanling Mountains in south China, were selected for investigation of palaeoclimatic changes. Multi-proxy records of the two cores including lithological variation, organic carbon isotope ratio, dry bulk density, organic matter content, magnetic susceptibility, humification degree, median grain size and geochemical proxies reveal that during the last deglaciation three drier phases correspond to the Oldest, Older and Younger Dryas cooling events, and the intercalated two wetter phases synchronise with the Bølling and Allerød warming events. The Holocene Optimum, which was resulted from a strengthening of the East Asian (EA) summer monsoon, occurred in the early and mid Holocene (ca. 10-6 cal. ka BP). In the mid and late Holocene (ca. 6-3 cal. ka BP), a prevailing dry climate suggested a weakening of the EA summer monsoon. The general trend of Holocene climatic changes in this study agrees with the 258 N summer solar insolation, suggesting that orbitally induced insolation may have played an important role in the Holocene climate in the study region.

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Asian Monsoon Variability Recorded in Other Archives

Cai

Jin

Zhou

et al. 2014

Late Cenozoic Climate Change in Asia

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This chapter provides an extensive review of paleomonsoon variability on millennial-to decadal time scales in various archives other than loess, including speleothems, lake sediments, peat deposits, desert deposits, marine sediments, corals, ice cores, tree rings, pollen archives and historical documents. Case studies will be presented to introduce the major proxy indexes associated with these archives, and the reconstructed history of Asian monsoon variability. Advances in the study of monsoon variability and the peculiarity of different archives will also be introduced in this chapter.Keywords Speleothems · Lake sediments · Peat · Desert · Marine sediments · Coral · Ice cores · Tree ring · Pollen · Historical documents Overview of Various Paleoclimate ArchivesAs described in the previous chapter, the eolian loess sequence, a unique geological archive in the world, plays an important role in studying the climatic and environmental changes in China as it documents the variability of both Asian monsoon and the aridification of inland Asia. It has the advantages of being relatively continuous and long-lasting for studying the monsoon changes and inland aridifications on tectonic and orbital time scales, and even has the potential for studies of monsoon variations on millennial time scales at some sites. However, other geo-biological archives and historical records are also essential in studying the Asian monsoon changes, as they provide indispensable information for fully understanding Asian monsoon changes and its dynamic forces and environmental effects, especially on the millennial to decadal time scales. For example, taking advantage of high-precision absolute U-series dating, speleothems from karst caves, provide the ages of the abrupt events that occurred within the Asian monsoon regions and make it possible to correlate these events with global climate changes, enhancing greatly our understanding of the linkage between Asian monsoon and global climate change. With multiple proxies, lake sediments are good at providing the integrated information on hydrology, weathering processes, biomass and other aspects within the drainage systems. Coral records may indicate the changes in moisture supply from the tropical ocean, ocean circulation, sea surface temperature and other parameters linked closely with monsoon climate. Tree-ring records provide annual changes of regional temperature, precipitation and the hydrological environment, and are the basis to fully describe the present global warming and the anthropogenic contribution. As the direct index of vegetation, pollen assemblages indicate the succession of vegetation associated with monsoon changes, revealing variations in moisture availability and temperature. Therefore, studies of these various archives, as well as peatbogs, ice cores, marine and desert deposits and historical records, greatly expanded our knowledge of the variability of Asian monsoons and their driving forces.This chapter will focus on various archives used in the study of Asian mon...

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Humification degrees of peat in Qinghai-Xizang Plateau and palaeoclimate change

Cited by 36 publications

References 22 publications

High-resolution peat records for Holocene monsoon history in the eastern Tibetan Plateau

High-resolution peat records for Holocene monsoon history in the eastern Tibetan Plateau

Climatic changes since the last deglaciation inferred from a lacustrine sedimentary sequence in the eastern Nanling Mountains, south China

Asian Monsoon Variability Recorded in Other Archives

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