Climate Change Impact PENGARUH PERUBAHAN IKLIM TERHADAP KUALIT

Anonymous, 2007. Climate change and water resources Agriculture  Declining crop yields are likely to leave hundreds of millions without the ability to produce or purchase sufficient food supplies, especially in Africa.  At mid to high latitudes, crop yields may increase for low levels of change in temperature, but will decline at higher levels of temperature change. Anonymous, 2007. Climate change and water resources Health  Higher temperatures expand the range of some dangerous vector-borne diseases, such as malaria, which already kills one million people annually, most of whom are children in the developing world.  Further, heat waves associated with climate change and increases in water borne diseases, will result in increased health problems. Anonymous, 2007. Climate change and water resources Coastline  Melting ice and thermal expansion of oceans are the key factors driving sea level rise.  In addition to exposing coastlines, where the majority of the human population live, to greater erosion and flooding pressures.  Rising sea levels will also lead to salt water contamination of groundwater supplies, threatening the quality and quantity of freshwater access to large percentages of the population.  For example, according to some estimates a 1 meter rise in sea level will displace 80 percent of the population of Guyana. Anonymous, 2007. Climate change and water resources Water  Rising global temperatures will lead to an intensification of the hydrological cycle.  Resulting in dryer dry seasons and wetter rainy seasons.  Subsequently heightened risks of more extreme and frequent floods and drought.  Impacts on the availability of water, as well as the quality and quantity of water that is available and accessible.  Melting glaciers will increase flood risk during the rainy season, and strongly reduce dry-season water supplies to one-sixth of the World’s populatio . Anonymous, 2007. Climate change and water resources Latin America: temperatures are predicted to increase by between 0.2- 2 oC low estimate to 2- 6 oC high estimate in the next century. El Niño events will increase in frequency and severity during summer months, and some areas will experience hot and cold waves. Africa: greater climate variability, and increasing frequency and intensity of severe weather over the next 50 years. The northern and southern latitudes will become dryer and the tropics will become wetter. Asia: summer and winter temperatures rise by 0.1- 0.2 oC per decade over the next 10-20 years. Heavy rainfall and cyclone intensity may increase due to disruption of the El Niño cycle and increasing sea surface temperatures. IPCC, 2001 • Changes to hydrological regime. • I reased floodi g, ater loggi g, sali ity aused y higher runoff in some river basins. • De reased surfa e ru off i so e asi s due to increased evaporation. • Cha ges i fresh ater a aila ility i oastal regions. • “ea le el rise, leadi g to i u datio of lo -lying areas, shoreline retreat, changes to water table, salinization acidification of soil.

3. Climate Change Effect on Aquatic Ecosystem

• Much of the solar energy received by the Earth is used to drive the hydrological cycle. • Higher levels of solar energy trapped in the atmosphere will lead to an intensification of this cycle, resulting in changes in precipitation patterns. • These changes will result in increased floods and drought which will have significant impacts on the availability of freshwater. • These impacts on freshwater will be further compounded by rising sea levels, and melting glaciers. Climate Change Effect on Aquatic Ecosystem  Climate change is expected to have far-reaching consequences for river regimes , flow velocity , hydraulic characteristics , water levels , inundation patterns , residence times , changes in wetted areas and habitat availability , and connectivity across habitats .  More intense rainfall and flooding could result in increased loads of suspended solids, sediment yields, E. coli and contaminant metal fluxes associated with soil erosion and fine sediment transport from the land Whitehead et al., 2009. Climate Change Effect on Aquatic Ecosystem  The most immediate reaction to climate change is expected to be in river and lake water temperatures.  River water temperatures are in close equilibrium with air temperature and, as air temperatures rise, so will river temperatures.  There has already been a 1 –3°C temperature rise over the past 100 years in large European rivers such as the River Rhine and the River Danube EEA, 2007a. Climate Change Effect on Aquatic Ecosystem