skylinenorwich
15-10-2009, 11:01 PM
Available to download is a copy of the DEFRA PDF titled Geo-engineering 0409, which appeared on their site in April but has now mysteriously disappeared.
And contains on page 12 -
"using airborne sub-microscopic particles such as sulphate, metals, dielectrics, resonant scatterers or dust [A12]. These aerosol particles would be created by releasing aerosol precursors into the stratosphere. This could be done by: releasing precursors at the Earth‘s surface and allowing them to be carried into the stratosphere; or delivering them into the stratosphere using high-altitude balloons or aircraft [B2] (possibly by addition to aviation fuel, which could reduce the cost of delivery [Q15])."
"Sulphate aerosols — The most widely-discussed proposal in this category involves the injection of sulphate aerosols into the stratosphere24. It has been estimated that this scheme would require ~1.5 to 3 teragrams of sulphur to be added to the stratosphere each year to counter the effects of a doubling of CO2 levels25, although another study suggested that ~5 teragrams of sulphur per year might be needed to mitigate future warming26 [cf. B3, F4]. The aerosols could be produced: either by injecting sulphur dioxide into the stratosphere, where it would be converted into sulphuric acid droplets; or by releasing long-lived sulphur compounds such as carbonyl sulphide (OCS) at the surface [AD1]. Unlike in the troposphere, sulphate aerosols in the stratosphere do not get washed out within a few weeks, but have a residence time of ~1 to 2 years."
Please read for yourselves -
http://www.mediafire.com/?sharekey=9b77b5dbc7d402ad8ef1259ff1b60e81e04e75f6 e8ebb871
And contains on page 12 -
"using airborne sub-microscopic particles such as sulphate, metals, dielectrics, resonant scatterers or dust [A12]. These aerosol particles would be created by releasing aerosol precursors into the stratosphere. This could be done by: releasing precursors at the Earth‘s surface and allowing them to be carried into the stratosphere; or delivering them into the stratosphere using high-altitude balloons or aircraft [B2] (possibly by addition to aviation fuel, which could reduce the cost of delivery [Q15])."
"Sulphate aerosols — The most widely-discussed proposal in this category involves the injection of sulphate aerosols into the stratosphere24. It has been estimated that this scheme would require ~1.5 to 3 teragrams of sulphur to be added to the stratosphere each year to counter the effects of a doubling of CO2 levels25, although another study suggested that ~5 teragrams of sulphur per year might be needed to mitigate future warming26 [cf. B3, F4]. The aerosols could be produced: either by injecting sulphur dioxide into the stratosphere, where it would be converted into sulphuric acid droplets; or by releasing long-lived sulphur compounds such as carbonyl sulphide (OCS) at the surface [AD1]. Unlike in the troposphere, sulphate aerosols in the stratosphere do not get washed out within a few weeks, but have a residence time of ~1 to 2 years."
Please read for yourselves -
http://www.mediafire.com/?sharekey=9b77b5dbc7d402ad8ef1259ff1b60e81e04e75f6 e8ebb871