Coal-fired power stations in Collie, Western Australia emit 10 million tonnes of CO2 per year. This study assesses the potential opportunities of geological storage of CO2 both within the Collie Basin and the onshore part of the adjacent Southern Perth Basin of Western Australia within 50 km of Collie town site through a desktop evaluation of existing data. The aquifers and coal formations within both basins have been evaluated for their suitability for storage based on geological, geographical and environmental criteria related to storage capacity, injectivity, proximity to sources of CO2, location of other natural resources and containment security. The study has concluded that there is limited scope for large-scale storage of CO2 within the Collie Basin. In addition the potential for storage within coals of either basin is not a viable solution. This assessment is based on published criteria for CO2 storage in sedimentary basins and coal-bearing formations. 相似文献
A multilayer study of pCO2 for the Yellow and South China Seas in the surface waters was conducted based on data from four cruises sponsored by the
China SOLAS Project in 2005 and 2006, including data for the surface microlayer (SML), subsurface layer (SSL) and surface
layer (SL). The carbon fluxes across the air-sea interface were calculated. The results showed that the pCO2 values in the surface waters of the study area decreased in the following order: pCO2 SML > pCO2 SSL > pCO2 SL. The highest values were found in March for all SML, SSL and SL, followed by those in April, and the lowest were in May.
The pCO2 values had a significant positive correlation with temperature or salinity. While there was no relationship between pCO2 and longitude, there was a significant negative correlation between it and latitude, i.e., ‘high latitude low pCO2’. By using four calculation models, the carbon dioxide fluxes (
) in spring in the Yellow and South China Seas, which were found to act as a ‘sink’ of atmospheric CO2, were preliminarily estimated on the basis of the pCO2 data in the SML to be −7.00×106t C and −22.35×106t C, respectively. It is suggested that the
calculated on the basis of pCO2 data in the SML is more reliable than that calculated on the basis of those in the SL. 相似文献
This paper explores policies for Negative Emissions Technologies (NETs), in an attempt to move beyond the supply-side focus of the majority of NETs research, as well as the current dominance of carbon pricing as the main NETs policy proposal. The paper identifies a number of existing policies from four key areas – energy/transport, agriculture, sub-soil, and oceans – which will have an impact on three NETs: Bioenergy with Carbon Capture and Storage (BECCS), Direct Air Capture (DAC), and terrestrial Enhanced Rock Weathering (ERW). We propose that non-climate co-benefits may be valuable in terms of the policy ‘demand pull’ for NETs; in particular, we find that ERW may provide multiple co-benefits which can be mandated through existing policy structures. However, interaction with numerous policy areas may also create barriers, particularly where there is tension between the priorities of different government departments. On the basis of existing and analogous policies from a range of geographical contexts and scales, this paper proposes four options for NETs policy that could be reasonably implemented in the near-term. We also argue that ERW demonstrates the importance of scale and framing, because the policy environment depends on whether it is framed as a soil amendment at local scales or as a climate stabilization technique at international scale.
Key policy insights
Co-benefits may assist the ‘demand pull’ for novel technologies by providing multiple policy angles for incentivisation rather than relying on a ‘fix-all’ policy such as a high carbon price.
DAC with storage might be overly reliant on a high carbon price, because it only provides one core benefit – that of atmospheric carbon reduction.
ERW may provide multiple co-benefits which can be mandated through existing policy structures, but should focus on using waste rock rather than mining virgin material.
We propose four near-term options for NETs policy: funding for small-scale BECCS demonstration and an international biomass certification mechanism; small-scale loans for ERW on farms and promotion of locally-sourced rock residues; amendment of fertilizer subsidy schemes to include silicate rock; and a clearer framework for licensing sub-soil access for CO2 storage.
Drip water, collected above three actively forming stalagmites, has been analyzed and the results discussed using a calcite saturation index versus equilibrium carbon dioxide partial pressure theoretical relationship. Percolating water appears to have been originated from a parent solution in equilibrium with a carbon dioxide rich gas phase having a minimum concentration varying between 15,000 ppmv and 26,000 ppmv while large part of the variability recorded in the cave can be explained by different stage of degassing. Similarly, analyses performed at several cave pools confirm that drip water rapidly achieves equilibrium with the cave atmosphere after impact on the stalagmite apex, while oversaturation is retained longer. Using these boundary conditions, the changes in inorganic carbon concentration in the percolating water have been calculated and converted into fluxes using an average effective infiltration flow estimated from the annual water balance.The predicted flux of carbon dioxide degassing from drip water is in the range of 0.03–0.06 μmol m−2 s−1. This flux has been found to be one of the major sources of carbon dioxide in the cave atmosphere during low ventilation periods. 相似文献
The riverine dissolved silicon (DSi) brings environmental information on biogeochemical processes of terrestrial surface, of which the input, transferring, transformation and output are influenced by many factors. Among the weathering of global silicate rocks, 31.53%~64.87% of DSi are intercepted by terrestrial vegetation and only about 12.9% are transferred into rivers. During being transported into ocean, riverine DSi gets impacts from aquatic biological absorption, reverse weathering process and artificial lake effect. The quantity of output is further reduced, which weakens the effect of the oceanic biological pump. According to limited data, the DSi concentration of global rivers has a large variation, ranging from 138 μmol/L to 218μmol/L. It is necessary to quantify contribution rates of influencing factors and establish output models controlled by multiple factors. The δ30Si of riverine DSi ranges from -0.2‰ to 3.4‰. Comparing with the δ30Si of silicate rock, which is about -0.5‰, the fractionation factor is significantly partial to positive from 0.3‰ to 3.9‰. That is because of the occurrence of kinetic fractionation process in river basin including inorganic and organic fractionation. Thus, the key problems, sources and transformation mechanisms of riverine DSi during migration and being transported should be solved in future. 相似文献