scholarly journals Modeling of surface dust concentration in snow cover at industrial area using neural networks and kriging

2017 ◽  
Author(s):  
A. P. Sergeev ◽  
D. A. Tarasov ◽  
A. G. Buevich ◽  
A. V. Shichkin ◽  
A. G. Tyagunov ◽  
...  
Keyword(s):  
Neural Networks ◽  
Snow Cover ◽  
Industrial Area ◽  
Dust Concentration ◽  
Surface Dust

Spatial Distribution and Sources of Heavy Metal Pollution of Surface Dust in Taiyuan, China

2015 ◽  
Vol 737 ◽  
pp. 503-507
Author(s):  
Yong Zhang ◽  
Jing Xia Chen ◽  
Jun Qiu Zhang ◽  
Ying Te Wang
Keyword(s):  
Heavy Metals ◽  
Industrial Area ◽  
Shanxi Province ◽  
Surface Dust ◽  
Flame Atomic Absorption ◽  
Flame Atomic Absorption Spectrophotometer ◽  
Development Area ◽  
High Concentrations ◽  
Functional Areas ◽  
Different Levels

The concentrations of heavy metals (Cr, Cu, Ni, Pb and Mn) were determined using flame atomic absorption spectrophotometer after digested with four acids. The samples were collected from seven kinds of different functional areas in Taiyuan, China. The concentration of the heavy metals were found in Taiyuan is higher than the soil background values in Shanxi Province, which appeared different levels of accumulation. High concentrations of Cr, Ni, Mn were found in the samples from industrial area and Cu was noted from economic development area. The correlational analysis and principle component analysis showed that the heavy metals of surface dust in Taiyuan were mainly influenced by industrial activities.

Pollution of snow cover in the impact zone of enterprises in Norilsk Industrial Area

2014 ◽  
Vol 7 (6) ◽  
pp. 714-722 ◽  
Author(s):  
A. A. Onuchin ◽  
T. A. Burenina ◽  
O. N. Zubareva ◽  
O. V. Trefilova ◽  
I. V. Danilova
Keyword(s):  
Snow Cover ◽  
Industrial Area ◽  
Impact Zone ◽  
The Impact

scholarly journals Modulation of springtime surface sensible heating over the Tibetan Plateau on the interannual variability of East Asian dust cycle

2020 ◽  
Vol 20 (18) ◽  
pp. 11143-11159
Author(s):  
Xiaoning Xie ◽  
Anmin Duan ◽  
Zhengguo Shi ◽  
Xinzhou Li ◽  
Hui Sun ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Heat Source ◽  
Interannual Variability ◽  
East Asian ◽  
Asian Dust ◽  
Dust Concentration ◽  
The Tibetan Plateau ◽  
Dust Source ◽  
Surface Dust ◽  
Surface Sensible Heating

Abstract. Previous observational evidence and numerical simulations have revealed that the surface sensible heating in spring (March–April–May, MAM) over the Tibetan Plateau (TPSH) can affect the Asian regional hydrological cycle, surface energy balance, and climate through altering atmospheric heat source of the Tibetan Plateau (TP). This study aims to investigate the impacts of MAM TPSH on the interannual variability of East Asian dust cycle by using CAM4-BAM (version 4 of the Community Atmosphere Model coupled to a bulk aerosol model), MERRA-2 (version 2 of the Modern-Era Retrospective analysis for Research and Applications) surface dust concentration, and TPSH measurements. Our simulations show that the surface dust concentrations over the East Asian (EA) dust source region and over the northwestern Pacific (NP) in MAM are significantly positively correlated with TPSH, with regionally averaged correlation coefficients of 0.49 for EA and 0.44 for NP. Similar positive correlations are also shown between the MAM TPSH measurements averaged over the 73 observation sites and the surface dust concentration from MERRA-2. Simulation-based comparisons between strongest and weakest TPSH years reveal that, the MAM surface dust concentration in the strongest TPSH years increases with relative differences of 13.1 % over EA and 36.9 % over NP. These corresponding differences are found in MERRA-2 with 22.9 % and 13.3 % over EA and NP, respectively. Further simulated results show that the processes of whole dust cycles (e.g., dust loading, emission, and transport, as well as dust deposition) are also significantly enhanced during the strongest TPSH years over EA and NP. Through enhancing the TP heat source, stronger TPSH in MAM generates an anticyclonic anomaly in middle and upper troposphere over the TP and over the downstream Pacific region, respectively. These atmospheric circulation anomalies induced by the increased TPSH result in increasing the westerly winds over both EA and NP, which in turn increases dust emissions over the dust source, and dust transport over these two regions, as well as the regional dust cycles. These results suggest that addressing the East Asian dust changes in the future climates requires considering not only increasing greenhouse gas emissions but also the variations of the TP's heat source under global warming.

scholarly journals Modulation of surface sensible heating over the Tibetan Plateau on the interannual variability of East Asian dust cycle

2020 ◽  
Author(s):  
Xiaoning Xie ◽  
Anmin Duan ◽  
Zhengguo Shi ◽  
Xinzhou Li ◽  
Hui Sun ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Heat Source ◽  
Interannual Variability ◽  
East Asian ◽  
Asian Dust ◽  
Dust Concentration ◽  
The Tibetan Plateau ◽  
Dust Source ◽  
Surface Dust ◽  
Surface Sensible Heating

Abstract. Previous observational evidence and numerical simulations have revealed that the surface sensible heating in MAM (March–April–May) over the Tibetan Plateau (TPSH) can affect the Asian regional hydrological cycle, surface energy balance, and climate through altering atmospheric heat source of the Tibetan Plateau (TP). This study aims to investigate the impacts of MAM TPSH on the interannual variability of East Asian dust cycle by use of CAM4-BAM (version 4 of the Community Atmosphere Model coupled to a bulk aerosol model), the MERRA-2 (version 2 of the Modern Era Retrospective-Analysis for Research and Applications) surface dust concentration, and TPSH measurements. Our simulations show that the surface dust concentrations over the East Asian dust source region (EA) and over the northwestern Pacific (NP) in MAM are significantly positively correlated with TPSH, with regionally averaged correlation coefficients of 0.49 for EA and 0.44 for NP. Similar positive correlations are also shown to exist between the MAM TPSH measurements averaged over the 73 observation sites and the surface dust concentration from MERRA-2. Simulation-based comparisons between strongest and weakest TPSH years reveal that, the MAM surface dust concentration in the strongest TPSH years increases with relative differences of 13.1 % over EA and 36.9 % over NP. These corresponding differences are found in MERRA-2 with 22.9 % and 13.3 % over EA and NP, respectively. Further simulated results show that the processes of whole dust cycles (e.g., dust loading, emission, and transport, as well as dust depositions) are also significantly enhanced during the strongest TPSH yeas over EA and NP. Through enhancing the TP heat source, stronger TPSH in MAM generates an anticyclonic anomaly in middle and upper troposphere over TP and over the downstream Pacific region, respectively. These atmospheric circulation anomalies induced by the increased TPSH result in increasing the westerly winds over both EA and NP, which in turn increases dust emissions over the dust source, and dust transports over these two regions, as well as the regional dust cycles. These results suggest that addressing the East Asian dust changes in the future climates require considering not only increasing greenhouse gas emissions but also the variations of the TP's heat source under global warming.

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