Relationship between calcium and atmospheric dust recorded in Guliya ice core

YAOTandong,; WUGuangjiant,; PUJianchen,; JIAOKeqin,; HUANGCuilan,

doi:10.1360/03wd0417

Cited by 9 publications

(10 citation statements)

References 7 publications

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“…Dust in glacial ice may influences physiological state of microorganisms, because it might absorb solar radiation and form small water bulbs in glacial ice, and as a result activities of microorganisms can be supported (Priscu et al, 1998). Yao et al (2004) and Wu et al (2004) pointed out that high dust concentrations correlated with cold periods in the Tibetan ice cores. The mechanism might be that low temperature will not only cause the expansion of the dust source area, but also increase the wind speed, resulting in more terrestrial dust input into the atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Culturable bacteria in Himalayan glacial ice in response to atmospheric circulation

Zhang

Hou

et al. 2007

Biogeosciences

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Abstract.Only recently has specific attention been given to culturable bacteria in Tibetan glaciers, but their relation to atmospheric circulation is less understood yet. Here we present the results of culturable bacteria preserved in an ice core drilled from the East Rongbuk (ER) glacier, Himalayas. The average concentrations of culturable bacteria are 5.0, 0.8, 0.1 and 0.7 CFU mL −1 for the glacier ice deposited during the premonsoon, monsoon, postmonsoon and winter seasons, respectively. The high concentration of culturable bacteria in ER glacier deposited during the premonsoon season is attributed to the transportation of continental dust stirred up by the frequent dust storms during spring. This is also confirmed by the spatial distribution of culturable bacteria in Tibetan glaciers. Continental dust originated from the Northwest China accounts for the high abundance of culturable bacteria in the northern Tibetan Plateau, while monsoon moisture exerts great influence on culturable bacteria with low abundance in the southern plateau. The numbers of representatives with different ARDRA patterns from RFLP analysis are 10, 15, 1 and 2 for the glacial ice deposited during the premonsoon, monsoon, postmonsoon and winter seasons, respectively, suggesting that culturable bacteria deposited in ER glacier during monsoon season are more diverse than that deposited during the other seasons, possibly due to their derivation from both marine air masses and local or regional continental sources, while culturable bacteria deposited during the other seasons are from only one possible origin that is transported by westerlies. Our results show the first report of seasonal variations of abundance and species diversity of culturable bacteria recovered from glacial ice in the Himalayas, and we suggest that microorganisms in Himalayan ice might provide a potential new proxy for the reconstruction of atmospheric circulation.

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Section: Introductionmentioning

confidence: 99%

Culturable bacteria in Himalayan glacial ice in response to atmospheric circulation

Zhang

Hou

et al. 2007

Biogeosciences

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“…Dust trapped in the Guliya ice cap is mainly deposited during winter and spring. Ion analyses show the origin of the dust in this ice core is mainly from the Taklamakan Desert and the Tibetan Plateau Yao et al 2004). The temporal variation in microparticle concentration in this core is related to δ 18 O-derived temperature changes.…”

Section: Climatic Change Since the Last Interglaciation Recorded In Gmentioning

confidence: 90%

“…Microparticles in the Guliya and Dunde ice cores are chiefly from desert mountains on the northern plateau. Records from these sites reflect atmospheric circulation and provide dust source information (Yao et al 2004;Wu et al 2004b). …”

Section: Microparticlesmentioning

confidence: 99%

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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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“…This indicates that the dust event frequency decreased over the study period. If the periods with a higher dust ratio than its long-range average value (about 25.5%) are regarded as the active periods of dust events while the periods with a lower dust ratio than its long-range average as the calm periods, the active periods are 1900-1915, 1925-1950 and 1960-1965 A.D., and the calm periods are 1915-1925, 1950-1960 and 1965-1999 A.D. Continental Ca 2+ concentration in ice cores is also a proxy of dust events [27,28] . Figure 2(b) presents the yearly variations in Ca 2+ concentration in Dunde ice core [29] .…”

Section: Dust Proxies and Their Data Seriesmentioning

confidence: 99%

Variations in dust event frequency over the past century reflected by ice-core and lacustrine records in north China

Wang

Yang

Shen

et al. 2007

Sci. China Ser. D-Earth Sci.

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In this paper, we analyzed the variations of dust proxies in the Dunde, Malan and Chongce ice cores from the northern Tibetan Plateau and the Hongjiannao lacustrine sediment core from north Shaanxi Province, and found that they all showed a general decrease trend over the past century. Owing to the fact that all these ice cores and lacustrine core were retrieved from the margins and/or the leeward sides of the major areas of dust events in north China, their records could suggest that the dust event frequency in north China declined over the study period. This decrease trend might be attributed to increasing precipitation and weakening westerly. However, human activities have made the areal extent of desertification expand acceleratingly in north China. This status could make it possible that dust events would occur on a large spatial scale under the future climate change, which would be a big environmental issue we shall face.north China, dust event frequency, climate changeThe role of dust in climate system has attracted much more attention [1,2] . To better understand the causes of climate change, it is important to reconstruct the history of atmospheric dust loading. Generally, dust weather is a major process of continental dust entering the atmosphere, and the occurrences of dust events (dust storm, blowing dust, floating dust) are highly regional. Thus reconstructions of the history of dust event frequency in different areas, especially in the major dust source areas and their adjacent regions, such as the arid region in north China, are the basic works for study on the variations in atmospheric dust loading and its effects on climate and environment. Moreover, it is not clear what the major causes of recent variations of dust events in north China are, natural factors or human factors [3−7] . Meteorological observation data showed that the trends of variations in dust event frequency in most parts of north China were similar over the past several decades [8] .Therefore, investigating the causes of variations in dust event frequency in the areas with less human activities, such as in the northern Tibetan Plateau, could help us to understand the causes of variations in dust event frequency in most other areas of north China where human activities are concentrated. The study on the secular variations in dust event frequency in large parts of north China is of important significance for the prediction of dust events also. In this paper, we will analyze the variations in dust event frequency over the past century in north China using the ice-core and lacustrine records, and try to clarify the causes of the past variations of dust

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Relationship between calcium and atmospheric dust recorded in Guliya ice core

Cited by 9 publications

References 7 publications

Culturable bacteria in Himalayan glacial ice in response to atmospheric circulation

Culturable bacteria in Himalayan glacial ice in response to atmospheric circulation

Asian Monsoon Variability Recorded in Other Archives

Variations in dust event frequency over the past century reflected by ice-core and lacustrine records in north China

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