Human Impact on the Silica Cycle: Reduction of Dissolved Silica Inputs into the Ocean as a Result of the Increasing Impervious Cover
نویسندگان
چکیده
.................................................................................................................... iii ACKNOWLEDGMENTS.................................................................................................. v DEDICATION ..................................................................................................................vi LIST OF TABLES...........................................................................................................vii LIST OF FIGURES........................................................................................................ vii
منابع مشابه
Riverine contribution of biogenic silica to the oceanic silica budget
Biological uptake of dissolved silicate (DSi) and formation of biogenic silica (BSi) during diatom growth modifies the form of Si carried from the continents to the world ocean. Significant concentrations of BSi, averaging 28.0 pmol L-l, are found in all sizes of rivers. The global contribution of BSi carried by rivers was estimated as 1.05 ? 0.20 Tmol Si year’. Combined with the global mean ri...
متن کاملEvaluation of silica nanoparticles cytotoxicity (20-40 nm) on cancerous epithelial cell (A549) and fibroblasts cells of human normal lung fibroblast (MRC5)
Introduction: Silica nanoparticles have received more attraction in medical and industrial applications due to their unique properties such as small size, the possibility of surface functionalization, ease of production, and low cost. So, it is necessary to study the respiratory toxicity of occupational exposure due to the production and increasing use of silica nanoparticles, especially in the...
متن کاملتحلیل حساسیت متغیرهای موثر بر سیلاب شهری با استفاده از مدل SWMM
Complex in hydrological and hydraulic processes are one of the distinguishing features of urban areas. Therefore, accurate determination of the input variables of urban models and their impact on model output is time consuming and difficult. Sensitivity analysis shows which parameters impact more severely the results and ranked model parameters according to their effect on model output which ca...
متن کاملIce sheets as a missing source of silica to the polar oceans
Ice sheets play a more important role in the global silicon cycle than previously appreciated. Input of dissolved and amorphous particulate silica into natural waters stimulates the growth of diatoms. Here we measure dissolved and amorphous silica in Greenland Ice Sheet meltwaters and icebergs, demonstrating the potential for high ice sheet export. Our dissolved and amorphous silica flux is 0.2...
متن کاملPerformance Evaluation of Nano-silica Modified Bitumen
In this study, different contents of Nano-silica, 2 wt.%, 4 wt.% and 6 wt.%, have been added to bitumen to modify the physical, mechanical and rheological properties of warm mix asphalt (WMA). WMA is containing 2 wt.% of Sasobit (mixture of long-chain hydrocarbons). Various quality control tests have been carried out to characterize the modified bitumen and WMA. The rheo...
متن کامل