Long term impacts of Mount Krakatau
The eruption caused tephra (materials such as rock fragments ejected from volcano eruption) fall as far as 2,500 km downwind in the days following the eruption. However, the finest fragments were propelled high into the stratosphere, spreading outward as a broad cloud across the entire equatorial belt in only two weeks. These particles would remain suspended in the atmosphere for years, propagating farther to the north and south before finally dissipating.
Large volumes of sulfur dioxide gas was contained in the stratospheric cloud of dust emitted from Krakatau. These gas molecules rapidly combined with water vapour to generate sulfuric acid droplets in the high atmosphere. The resulting veil of acidic areosols and volcanic dust provided an atmospheric shield capable of reflecteing enough sunlight causing global temperatures to drop several degrees. This could disrupt the growth of vegetables.Since the sunlight is being blocked and sunlight is a raw material of photosynthesis. Photosynthesis is a process where carbon dioxide produced by humans would be converted to oxygen through the process of photosynthesis. This could have been an instant impact in the past.Breathing and respiration could have more difficult with lesser oxygen.
AFTERMATH: the Child of Krakatau
On December 29, 1927, a group of Javanese fisherman who were startled by steam and debris bleching from the sea above the collapsed caldera marks the reawakening of Krakatau after 44 calm years. The activity continued, and on January 26, 1928 the rim of a basaltic scoria cone first appeared above sea-level. A year later, it had grown into a small island which was quickly dubbed Anak ("Child of") Krakatau.
As the volcano erupted, a plume of ash swept 80km into the sky, the hot gas became unstable and raced across nearby islands at 150km. "Those who weren't killed by the intense heat," says Dr Dave Rothery, from the Department of Earth Sciences at the Open University, "would have been sandblasted to death. It was hot enough to carbonise everything in its path."
The giant tsunamis that were unleashed, reaching heights of 40m were so violent that they flung sections of coral reef ashore, some weighing as much as 600 tons. Like the Indonesian tsunami on Boxing Day 2004, these tsunamis destroyed everything in their path.
Fine ashes from the eruption were carried by upper level winds as far away as New York City.Volcanic dust blew into the upper atmosphere affecting incoming solar radiation and the earth's weather for several years.
Another would be the whole world's climate changing due to a volcanic eruption.
Links: http://www.geology.sdsu.edu/how_volcanoes_work/Krakatau.html
http://www.independent.co.uk/news/science/how-krakatoa-made-the-biggest-bang-476616.htmlAnother would be the whole world's climate changing due to a volcanic eruption.
Links: http://www.geology.sdsu.edu/how_volcanoes_work/Krakatau.html
http://www.drgeorgepc.com/Volcano1883Krakatoa.html
