Characteristics of sand storm dust sampled at an originating desert Case of the Taklamakan Desert

Nishikawa, Masataka; Mori, Ikue; Morita, Masatoshi; Hao, Qing; Koyanagi, Hideaki; Haraguchi, K

doi:10.1016/s0021-8502(00)90765-1

Cited by 6 publications

(4 citation statements)

References 2 publications

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“…A sand storm that began in the northern Taklamakan Desert on 22 April 1999 traveled southward to the city of Hotan at the southern edge of the Taklamakan Desert. Surface soil and fallout dust particles sampled in the vicinity of Hotan had average diameters of 130 and 63 μm, respectively, and particles 10 μm and smaller were readily transported as aeolian aerosols (Nishikawa et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Spatial and temporal variations of dust concentrations in the Gobi Desert of Mongolia

Jugder

Shinoda

Sugimoto

et al. 2011

Global and Planetary Change

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Section: Introductionmentioning

confidence: 99%

Spatial and temporal variations of dust concentrations in the Gobi Desert of Mongolia

Jugder

Shinoda

Sugimoto

et al. 2011

Global and Planetary Change

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“…It covers an area of 338,000 km 2 , and as much as 85 percent of it consists of active sand dunes [6,7] . Many researchers believe that the Taklamakan Desert was originally formed in the centre of the Tarim Basin as early as the Tertiary Period and then the desert expanded outwards [8] . The Tarim River is the chief river of the Uygur Autonomous Region of Xinjiang, extreme northwestern China.…”

Section: Study Areamentioning

confidence: 99%

Monitoring vegetation dynamics with SPOT-VEGETATION NDVI time-series data in Tarim Basin, Xinjiang, China

Wan

Sun

2009

SPIE Proceedings

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Desertification in the arid and semiarid regions directly influences the density and growth status of vegetation, NDVI (Normalized Difference Vegetation Index) has been widely used to monitor vegetation changes. This study analyzed the spatial patters of vegetation activity and its temporal variability in Tarim Basin, Xinjiang, China since 1998 to 2007 with NDVI data derived from SPOT4 Vegetation. The coefficient of variation (CoV) of the NDVI was used as a parameter to characterize the change of vegetation and to compare the amount of variation in different sets of sample data. The method of quantifying changes in CoV values for each pixel was based on linear regression. The slope of linear regression was acted as the criterion for the change direction: pixels with a negative slope are considered to represent ground area with decreasing amounts of vegetation, vice versa. In this paper, We calculated (1) the inter-annual CoV based on the yearly ∑NDVI, the sum of the monthly NDVI in the growing season (from April to October), for each pixel between 1998-2007 to reveal the spatial patterns of vegetation activity, (2) the intra-annual CoV based on monthly NDVI by MVC to reflect vegetation seasonal dynamics, (3) the slope (κ) of the intra-annual CoV regression line for each pixel to identify the overall long-term trend of vegetation dynamics. This experiment demonstrated the feasibility of applying the CoV and its regression analysis based on long term SPOT-VGT NDVI time-series data for vegetation dynamics monitoring.

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“…Moreover, more and more studies showed that they were not practical dust source areas because the salt crusts formed on their surfaces strongly suppress dust deflation. − Sandy and gravel deserts are two major sedimentary environments in the Taklamakan Desert. They occupy over 90% of the total basin area and are traditionally identified as the primary dust source. − However, chemical analysis showed that the soils collected from these sandy and gravel deserts in the Taklamakan Desert contain very low water-soluble sulfate, , and the contents were much lower than the observed dust sulfates. ,− …”

Section: Introductionmentioning

confidence: 99%

“…They occupy over 90% of the total basin area and are traditionally identified as the primary dust source. 38−40 However, chemical analysis showed that the soils collected from these sandy and gravel deserts in the Taklamakan Desert contain very low water-soluble sulfate, 41,42 and the contents were much lower than the observed dust sulfates. 12,31−33 The fine-sized soil fraction in the source area was considered representative of the soil-emitted dust.…”

Section: Introductionmentioning

confidence: 99%

Saltation–Sandblasting Processes Driving Enrichment of Water-Soluble Salts in Mineral Dust

Cheng

et al. 2022

Environ. Sci. Technol. Lett.

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Dust aerosols over the Taklamakan Desert contain up to 3%−4% of soil-derived water-soluble sulfate, much higher than that in the soil. It has been hypothesized that this is due to aerosol−soil fractionation during dust emission. Here, we tested this hypothesis based on laboratory simulations of saltation and sandblasting processes. Two types of soil samples (sandy deserts and gravel deserts) were collected from the Taklamakan Desert, from which dust aerosols were generated for offline chemical analyses. We found that these laboratory-generated dust aerosols contain soil-derived watersoluble ions, and the contents are comparable to those measured in ambient dust but were several to hundreds of times those of the original soils. We argue that it is the fractionation in the saltation and sandblasting processes that led to the enrichment of watersoluble salt in dust aerosols. Our results provide the first geochemical constraints for understanding the origins of water-soluble ions in dust particles emitted from the Taklamakan Desert and the impact of chemical processing on dust composition during long-range transport.

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Characteristics of sand storm dust sampled at an originating desert Case of the Taklamakan Desert

Cited by 6 publications

References 2 publications

Spatial and temporal variations of dust concentrations in the Gobi Desert of Mongolia

Spatial and temporal variations of dust concentrations in the Gobi Desert of Mongolia

Monitoring vegetation dynamics with SPOT-VEGETATION NDVI time-series data in Tarim Basin, Xinjiang, China

Saltation–Sandblasting Processes Driving Enrichment of Water-Soluble Salts in Mineral Dust

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