| Results will be presented from Earth System Model simulations of the climate engineering
method of cirrus cloud thinning. This climate engineering method aims to cool temperatures
as a response to seeding of high altitude ice clouds in order to deplete them. Hence
more longwave radiation is allowed to escape to space. The ice crystal fall speed is
perturbed as a simplified representation of the otherwise complex and computationally
expensive micro-physics of the method. An octupling of the ice crystal fall speed at
temperatures colder than 235K is found to be of the order of magnitude needed to
offset the radiative forcing of a doubling of pre-industrial CO2 concentrations. The
resulting climatic effects are presented, including the response of temperatures,
hydrological cycle, with a particular emphasis on the East Asian Summer Monsoon. |