Characteristics of Surface Dust on Ürümqi Glacier No. 1 in the Tien Shan Mountains, China

Takeuchi, Nozomu; Li, Zhongqin

doi:10.1657/1523-0430(07-094)[takeuchi]2.0.co;2

Cited by 92 publications

(94 citation statements)

References 22 publications

(28 reference statements)

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“…The organic matter concentrations are extremely low, at a range from 20 to 120 ng g −1 along the Muztag Alta Glacier profile , and 0.3 to 2.8 ppm along the Puruogangri Glacier profile (Zhang, 2006). Despite the lack of data in the Malan and Dunde glaciers, the organic matter concentrations were reported at 10-350 ng g −1 and around 30 g m −2 in the high-altitude glaciers on the Tibetan Plateau Takeuchi and Li, 2008). The high quality of ice core records and overall extremely cold and oligotrophic glacier environments at the high altitudes ensures the preservation of microbial information in the ice, and makes it possible for a community comparison of microorganisms in the geographically isolated glaciers.…”

Section: Methodological Considerationsmentioning

confidence: 91%

“…The dramatic changes of the air masses may lead to differences in the microbial species pool and thus result in the distinct community composition of microorganisms across the glaciers. On the other hand, differences in the local climatic and environmental conditions, such as temperature, light intensity, meltwater availability and nutrient concentrations in the glacier ice (Takeuchi et al, 1998(Takeuchi et al, , 2001Takeuchi and Li, 2008;Takeuchi and Kohshima, 2004) may cause significant variation in the growth rate of tolerant microorganisms, which in turn may lead to the subsequent changes in the community composition of microorganisms in glacier ice. Variations in the phylogenetic population pool as a result of both aeolian and post-deposition processes lead to the apparent zonal distribution of microbial communities, which clearly corresponds to the distances across the four geographically isolated glaciers (Fig.…”

Section: Climatic and Environmental Implications Of Microbial Communimentioning

confidence: 99%

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Differences in community composition of bacteria in four glaciers in western China

Chen

Xiang

et al. 2010

Biogeosciences

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Abstract. Microbial community patterns vary in glaciers worldwide, presenting unique responses to global climatic and environmental changes. Four bacterial clone libraries were established by 16S rRNA gene amplification from four ice layers along the 42-m-long ice core MuztB drilled from the Muztag Ata Glacier. A total of 151 bacterial sequences obtained from the ice core MuztB were phylogenetically compared with the 71 previously reported sequences from three ice cores extracted from ice caps Malan, Dunde, and Puruogangri. Six phylogenetic clusters Flavisolibacter, Flexibacter (Bacteroidetes), Acinetobacter, Enterobacter (Gammaproteobacteria), Planococcus/Anoxybacillus (Firmicutes), and Propionibacter/Luteococcus (Actinobacteria) frequently occurred along the Muztag Ata Glacier profile, and their proportion varied by seasons. Sequence analysis showed that most of the sequences from the ice core clustered with those from cold environments, and the sequence clusters from the same glacier more closely grouped together than those from the geographically isolated glaciers. Moreover, bacterial communities from the same location or similarlyCorrespondence to: S.-R. Xiang (srxiang@ns.lzb.ac.cn) aged ice formed a cluster, and were clearly separate from those from other geographically isolated glaciers. In summary, the findings provide preliminary evidence of zonal distribution of microbial community, and suggest biogeography of microorganisms in glacier ice.

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Section: Methodological Considerationsmentioning

confidence: 91%

Section: Climatic and Environmental Implications Of Microbial Communimentioning

confidence: 99%

Differences in community composition of bacteria in four glaciers in western China

Chen

Xiang

et al. 2010

Biogeosciences

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“…org/codos1.html) will establish this important dataset. Planned future spaceborne instruments such as the NASA Hyperspectral Infrared Imager (27) will allow quantitative retrievals of radiative forcing by dust and other absorbing impurities in the Colorado River Basin and other critical snow-and glacier-melt hydrologic systems that are affected by dust or soot, such as the Himalaya (28), Karakoram (29), and Tien Shan (30).…”

Section: Discussionmentioning

confidence: 99%

Response of Colorado River runoff to dust radiative forcing in snow

Painter

Deems

Belnap

et al. 2010

Proc. Natl. Acad. Sci. U.S.A.

345

290

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The waters of the Colorado River serve 27 million people in seven states and two countries but are overallocated by more than 10% of the river's historical mean. Climate models project runoff losses of 7-20% from the basin in this century due to human-induced climate change. Recent work has shown however that by the late 1800s, decades prior to allocation of the river's runoff in the 1920s, a fivefold increase in dust loading from anthropogenically disturbed soils in the southwest United States was already decreasing snow albedo and shortening the duration of snow cover by several weeks. The degree to which this increase in radiative forcing by dust in snow has affected timing and magnitude of runoff from the Upper Colorado River Basin (UCRB) is unknown. Here we use the Variable Infiltration Capacity model with postdisturbance and predisturbance impacts of dust on albedo to estimate the impact on runoff from the UCRB across 1916-2003. We find that peak runoff at Lees Ferry, Arizona has occurred on average 3 wk earlier under heavier dust loading and that increases in evapotranspiration from earlier exposure of vegetation and soils decreases annual runoff by more than 1.0 billion cubic meters or ∼5% of the annual average. The potential to reduce dust loading through surface stabilization in the deserts and restore more persistent snow cover, slow runoff, and increase water resources in the UCRB may represent an important mitigation opportunity to reduce system management tensions and regional impacts of climate change.aerosols | land use change | reflectivity | snow melt

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“…7, Takeuchi et al, 2001a;Takeuchi 2002a;Takeuchi et al, 2001c) Takeuchi et al, 2006b;2001b;2005;Takeuchi and Li, 2008). This indicates that the effect of impurities on the surface albedo was smaller than those of Asian glaciers.…”

Section: Comparison With Other Regionsmentioning

confidence: 97%

“…Gajda, 1958). The impact is greater on glaciers in Asian high mountains because a large amount of cryoconite often covers the entire glacier surface (Takeuchi et al, 2001b;Takeuchi and Li, 2008). Cryoconite usually contains substantial amounts of dark-colored organic matter (humic substances), which are effective albedo-reducers (Takeuchi et al, 2001b;Takeuchi, 2002b).…”

Section: Introductionmentioning

confidence: 99%

Spatial variations in impurities (cryoconite) on glaciers in northwest Greenland

Takeuchi

Nagatsuka

Uetake

et al. 2014

Bulletin of Glacier Research

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) on snow surface at the study sites. On Qaanaaq Glacier (an outlet glacier of Qaanaaq Ice Cap) impurity abundance was greatest at mid-elevations, with fewer impurities at upper and lower sites. Surface reflectivity was lowest in the mid-elevation area, suggesting that impurities substantially reduce ice surface albedo at mid-elevations on glacier surfaces. Organic matter content in the impurities ranged from 1.4 to 12.0% (mean: 5.4%) on the ice and from 3.2 to 10.6% (mean: 6.7%) on the snow surface. Microscopy revealed that impurities in the ice areas mainly consisted of cryoconite granules, which are aggregations of mineral particles, filamentous cyanobacteria and other microbes and organic matter, while those in snow areas consisted of mineral particles and snow algae. Results suggest that the spatial variation in the abundance of impurities is caused by supply of mineral particles both from air and ice, and microbial production of organic matter on the glacier surface.

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Characteristics of Surface Dust on Ürümqi Glacier No. 1 in the Tien Shan Mountains, China

Cited by 92 publications

References 22 publications

Differences in community composition of bacteria in four glaciers in western China

Differences in community composition of bacteria in four glaciers in western China

Response of Colorado River runoff to dust radiative forcing in snow

Spatial variations in impurities (cryoconite) on glaciers in northwest Greenland

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