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91.
受西班牙阿斯纳科利亚尔黄铁矿有毒污染液影响的土壤和植物中镉和锌浓度 总被引:2,自引:0,他引:2
Deborah J. Pain Andrew Meharg Gillian Sinclair Nicola Powell Jill Finnie Robert Williams Geoff Hilton 《Ambio-人类环境杂志》2003,32(1):52-57
引言 阿斯纳科利亚尔矿处于自西班牙中南部延伸至葡萄牙的黄铜矿丰富地带,劳斯福若斯是该矿的一个新开采地点,位于西班牙南部塞维尔以西45km,于1996年开工.提炼具有极高商业价值的锌(Zn)、铅(Pb)和汞(Hg)等高等级矿石产生了大量的重金属矿泥污水和高酸度废水(pH 2),而这些废水贮存在残渣围坝内,1998年4月25日,一处50m宽的决口使600万m3富含重金属的酸性废水和有毒矿渣泥浆(2:1的比例)泄漏到流经唐娜纳的高迪亚玛河(Gaudiamar). 相似文献
92.
Pius Lee Youhua Tang Daiwen Kang Jeff McQueen Marina Tsidulko Ho-Chun Huang Sarah Lu Mary Hart Hsin-Mu Lin Shaocai Yu Geoff DiMego Ivanka Stajner Paula Davidson 《Environmental Fluid Mechanics》2009,9(1):23-42
Discrepancies in grid structure, dynamics and physics packages in the offline coupled NWS/NCEP NAM meteorological model with
the U.S. Environmental Protection Agency Community Multiscale Air Quality (CMAQ) model can give rise to inconsistencies. This
study investigates the use of three vertical mixing schemes to drive chemistry tracers in the National Air Quality Forecast
Capability (NAQFC). The three schemes evaluated in this study represent various degrees of coupling to improve the commonality
in turbulence parameterization between the meteorological and chemistry models. The methods tested include: (1) using NAM
predicted TKE-based planetary boundary height, h, as the prime parameter to derive CMAQ vertical diffusivity; (2) using the NAM mixed layer depth to determine h and then proceeding as in (1); and (3) using NAM predicted vertical diffusivity directly to parameterize turbulence mixing
within CMAQ. A two week period with elevated surface O3 concentrations during the summer 2006 has been selected to test these schemes in a sensitivity study. The study results are
verified and evaluated using the EPA AIRNow monitoring network and other ozonesonde data. The third method is preferred a
priori as it represents the tightest coupling option studied in this work for turbulent mixing processes between the meteorological
and air quality models. It was found to accurately reproduce the upper bounds of turbulent mixing and provide the best agreement
between predicted h and ozonesonde observed relative humidity profile inferred h for sites investigated in this study. However, this did not translate into the best agreement in surface O3 concentrations. Overall verification results during the test period of two weeks in August 2006, did not show superiority
of this method over the other 2 methods in all regions of the continental U.S. Further efforts in model improvement for the
parameterizations of turbulent mixing and other surface O3 forecast related processes are warranted. 相似文献
93.
Farm forestry is a very minor land use in the inland agricultural landscapes of Australia. The Australian Government intends to introduce a program to encourage landholders to trade the carbon sequestration value of plantations and this may change the relative profitability of plantations against other agricultural land uses. This research compares the returns from a timber and ‘carbon’ plantation, with those from grazing and a common crop rotation in the Kingaroy area of Queensland.Typical production patterns for all systems were developed from producer and expert knowledge and soil and vegetation sampling were used to estimate sequestration rates. The costs and benefits of all land use systems were converted into monetary terms and discounted to produce net present values. With a standard discount rate and average commodity prices based on recent history, cultivation is the most profitable option, followed by pasture and plantations. After the inclusion of carbon, plantations are the most profitable option, followed by pasture and cultivation. A number of qualifications of these findings are also discussed. 相似文献
94.
Maki BE Sibley KM Jaglal SB Bayley M Brooks D Fernie GR Flint AJ Gage W Liu BA McIlroy WE Mihailidis A Perry SD Popovic MR Pratt J Zettel JL 《Journal of Safety Research》2011,42(6):473-485