Daniel Harrison: Regional marine cloud brightening for coral bleaching mitigation скачать в хорошем качестве

Daniel Harrison: Regional marine cloud brightening for coral bleaching mitigation

REGIONAL MARINE CLOUD BRIGHTENING FOR CORAL BLEACHING MITIGATION Daniel Harrison ab, Mark Baird c, Martin Lawrence b, Rob Wheen b, John Ridley b, Ian Jones ab a Marine Studies Institute, University of Sydney, 2006, Australia b Sydney Institute of Marine Science, Mosman, 2088, Australia c Atmospheric and Marine Research, CSIRO, Hobart, 7001, Australia Marine cloud brightening (MCB) applied regionally has been suggested as an intervention which could potentially mitigate bleaching of heat stressed coral reefs (Harrison, 2018). The proposal is that providing additional cloud condensation nuclei (CCN) in the form of nano sized salt crystals derived from evaporated sea water droplets to the marine boundary layer will increase the reflectivity of low lying marine stratocumulus clouds. By increasing the cloud albedo, incoming shortwave solar radiation reaching the sea surface is reduced, with the integrative effect that over some days to months ocean mixed layer temperatures are lowered and coral stress due to both heat and light is reduced. Global models of MCB, and atmospheric climatology indicate that the Great Barrier Reef is a good candidate for cloud brightening, but can it provide a tangible benefit to coral health? A modelling study using eReefs and WRF is underway to quantify the potential benefits and physical feasibility of cloud brightening. If shown to be technically viable there are many additional aspects of feasibility which must also be considered. These include technical and engineering aspects, costs, social license, governance, and consideration of the potential for undesirable side effects. These aspects form part of a feasibility study underway in the Reef Restoration and Adaption Program.