date: Fri Jan 21 12:47:20 2005 from: Phil Jones subject: Re: DECREASE IN GLOBAL TEMPERATURES DUE TO SULPHATES, PARTICULATES to: John Davies John, Been away. There isn't a simple answer to the question, even roughly. They have caused some cooling, but a number depends on the climate sensitivity. Best would be to look at the IPCC 3rd Assessment Report. Cheers Phil At 16:32 18/01/2005, you wrote: Dear Dr. Phil Jones, I hope that it will be possible for you to give a rough estimate to the following question. ' What is the estimated cooling effect, in degrees Celsius, of Sulphates, Particulates etc in the global atmosphere, on the global atmosphere at the surface and near to the surface of the earth.' All the Best, John B Davies. -- John B Davies ********************************************** Man-made climate change is the biggest environmental threat our planet faces. Tony Blair says climate change is the worlds greatest environmental challenge - yet the Government has sanctioned massive growth in air travel that will make it impossible to meet our carbon dioxide reduction targets. Take our Climate Challenge and make a real difference. [1]http://www.foe.co.uk/climate_challenge/ Make your personal stand against airport expansion - sign the airport pledge [2]http://www.airportpledge.org.uk Find out the real cost of cheap flights [3]http://www.foe.co.uk/campaigns/transport/issues/air_travel/index.html [4]http://www.airportwatch.org.uk Prof. Phil Jones Climatic Research Unit Telephone +44 (0) 1603 592090 School of Environmental Sciences Fax +44 (0) 1603 507784 University of East Anglia Norwich Email p.jones@uea.ac.uk NR4 7TJ UK ----------------------------------------------------------------------------