https://ir.lib.ncu.edu.tw/handle/987654321/18635 Search the Channel s https://ir.lib.ncu.edu.tw/simple-search https://ir.lib.ncu.edu.tw/handle/987654321/27731 title: Long-range southeastward transport of Asian biosmoke pollution: Signature detected by aerosol potassium in Northern Taiwan abstract: Total potassium was determined in aerosol particles between 2002 and early 2007 in northern Taiwan (25 degrees 02'N, 121 degrees 31'E). Biosmoke potassium (non-sea-salt/noncrustal) was assessed and used as a tracer of biosmoke pollution, which essentially represents the combination of coal and biofuel combustion and biomass burning. PM10-associated potassium displays a typical seasonality, peaking during the winter and waning during the summer. The size distribution showed a bimodal pattern, peaking at a supermicron size (2.5-5.6 mu m) and at around 1 mu m, demonstrating multiple sources. Size distribution patterns revealed an evident seasonality, indicative of the different domination of natural and biosmoke sources in the two main periods of the northeasterly and summer monsoons, respectively. The relative contributions of biosmoke and natural sources to the total potassium were estimated to be 50-75% and 25-50%, respectively; the seasonality of biosmoke potassium is similar to that of total potassium. Substantial correlations existed between biosmoke potassium and selected trace metals (As, Se, Pb, and Mn), suggesting that the latter are essentially associated with biosmoke pollution. Another significant finding is that the seasonal mean concentrations of aerosol potassium between 2002 and early 2007 tend to increase. This could primarily be attributed to the increased consumption of coal in China, posing an urgent issue relevant to pollution mitigation in China. The southward inflow flux of biosmoke potassium to the south of 25 degrees N during the northeasterly monsoon months has been estimated to be 56-79 mg m(-2) d(-1), which could be applied to the assessment of other biosmoke-related species. <br> Tue, 29 Jun 2010 11:14:54 GMT https://ir.lib.ncu.edu.tw/handle/987654321/27730 title: Dust deposition to the East China Sea and its biogeochemical implications abstract: Atmospheric Al concentrations published by Hsu et al. (2008) are used together with new information on mass particle-size distributions (MSDs) to calculate dust deposition to northern Taiwan and to evaluate the significance of the process for the East China Sea (ECS). Seasonal variations in aerosol Al in northern Taiwan show maxima in spring and winter and minima in summer and fall. The MSD of Al and Fe is monomodal, with a mean mass median diameter of 3.6 +/- 1.2 mu m, and the dry deposition velocity integrated over the entire MSD is 2.0 +/- 1.5 cm s(-1). The estimated dust deposition to the ECS is similar to 20 g m(-2) a(-1), with wet deposition accounting for three fourths of the total. The quantity of dust deposited decreases exponentially with distance from the source regions. The annual dust input to the entire ECS is estimated to be similar to 17 Mt, and when compared with riverine discharge, dust deposition appears to be a significant source of sediments and dissolved Fe. The large quantities of dust deposited also could have significant implications for the biogeochemical cycling of Fe (and Al), including effects on phytoplankton populations. <br> Tue, 29 Jun 2010 11:14:53 GMT