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Variation in aeolian environments recorded by the particle size distribution of lacustrine sediments in Ebinur Lake, northwest China.

Ma L, Wu J, Abuduwaili J - Springerplus (2016)

Bottom Line: Compared with the grain-size distributions of natural dust samples, the results showed that the coarser particle size fraction of lake sediments was mainly derived from the sediments that had experienced aeolian transport to the drainage surface, and the finer sediments came from hydraulic inputs.During the last 150 years, strong intensity aeolian transportation occurred during three periods, 1915-1935, 1965-1975 and since the beginning of the 2000s.Since 1950s, the climate controlled the foundation of aeolian dust transport, and the aeolian dust transport won't be increased under the humid climate.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, 830011 China.

ABSTRACT
Particle size analysis of lacustrine core sediments and atmospheric natural dust were conducted in the drainage area of Ebinur Lake in arid northwest China. Using a combination of (137)Cs and (210)Pb dating, a continuous record of aeolian transportation to the lake sediments and related factors over about the past 150 years was analyzed. Factor analysis revealed the particle-size distributions of riverine and aeolian sediments composed of the terrigenous materials of the lake deposits. Compared with the grain-size distributions of natural dust samples, the results showed that the coarser particle size fraction of lake sediments was mainly derived from the sediments that had experienced aeolian transport to the drainage surface, and the finer sediments came from hydraulic inputs. Then, the method of variations in particle-size standard deviation was used to extract the grain size intervals with the highest variability along a sedimentary sequence. The coarser grain-size populations dominated the variation patterns of the sedimentary sequence. During the last 150 years, strong intensity aeolian transportation occurred during three periods, 1915-1935, 1965-1975 and since the beginning of the 2000s. The climate was dry around 1910s-1930s in this region associated with the appropriate dynamic condition, which provided the enhanced source materials and wind power for the aeolian dust transport. Since 1950s, the climate controlled the foundation of aeolian dust transport, and the aeolian dust transport won't be increased under the humid climate.

No MeSH data available.


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Particle size distribution of the atmospheric dust samples (D1–D6) from Ebinur region
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Fig3: Particle size distribution of the atmospheric dust samples (D1–D6) from Ebinur region

Mentions: Sediment particle size fractions of (<4 μm), (4–16 μm), (16–32 μm), (32–64 μm) and (>64 μm) were generally about 31.1, 47.5, 15.2, 5.1, 1.1 %, respectively. Figure 2b presents values of particle size plotted versus depth, which show strong variations in particle size occur at a depth of about 30 cm. Long-term fluctuations of the <4-μm size components are correlated to those of the 4–16 μm ones, and the others are correlated with each other. The particle size frequency distribution curves for dust samples in the Ebinur drainage area span a wide range of 0.3–700 μm, within the modal particle size of 10–100 μm (Fig. 3).Fig. 3


Variation in aeolian environments recorded by the particle size distribution of lacustrine sediments in Ebinur Lake, northwest China.

Ma L, Wu J, Abuduwaili J - Springerplus (2016)

Particle size distribution of the atmospheric dust samples (D1–D6) from Ebinur region
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4837753&req=5

Fig3: Particle size distribution of the atmospheric dust samples (D1–D6) from Ebinur region
Mentions: Sediment particle size fractions of (<4 μm), (4–16 μm), (16–32 μm), (32–64 μm) and (>64 μm) were generally about 31.1, 47.5, 15.2, 5.1, 1.1 %, respectively. Figure 2b presents values of particle size plotted versus depth, which show strong variations in particle size occur at a depth of about 30 cm. Long-term fluctuations of the <4-μm size components are correlated to those of the 4–16 μm ones, and the others are correlated with each other. The particle size frequency distribution curves for dust samples in the Ebinur drainage area span a wide range of 0.3–700 μm, within the modal particle size of 10–100 μm (Fig. 3).Fig. 3

Bottom Line: Compared with the grain-size distributions of natural dust samples, the results showed that the coarser particle size fraction of lake sediments was mainly derived from the sediments that had experienced aeolian transport to the drainage surface, and the finer sediments came from hydraulic inputs.During the last 150 years, strong intensity aeolian transportation occurred during three periods, 1915-1935, 1965-1975 and since the beginning of the 2000s.Since 1950s, the climate controlled the foundation of aeolian dust transport, and the aeolian dust transport won't be increased under the humid climate.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, 830011 China.

ABSTRACT
Particle size analysis of lacustrine core sediments and atmospheric natural dust were conducted in the drainage area of Ebinur Lake in arid northwest China. Using a combination of (137)Cs and (210)Pb dating, a continuous record of aeolian transportation to the lake sediments and related factors over about the past 150 years was analyzed. Factor analysis revealed the particle-size distributions of riverine and aeolian sediments composed of the terrigenous materials of the lake deposits. Compared with the grain-size distributions of natural dust samples, the results showed that the coarser particle size fraction of lake sediments was mainly derived from the sediments that had experienced aeolian transport to the drainage surface, and the finer sediments came from hydraulic inputs. Then, the method of variations in particle-size standard deviation was used to extract the grain size intervals with the highest variability along a sedimentary sequence. The coarser grain-size populations dominated the variation patterns of the sedimentary sequence. During the last 150 years, strong intensity aeolian transportation occurred during three periods, 1915-1935, 1965-1975 and since the beginning of the 2000s. The climate was dry around 1910s-1930s in this region associated with the appropriate dynamic condition, which provided the enhanced source materials and wind power for the aeolian dust transport. Since 1950s, the climate controlled the foundation of aeolian dust transport, and the aeolian dust transport won't be increased under the humid climate.

No MeSH data available.


Related in: MedlinePlus