By Gordon Neil Davies
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Weather Bureau cloud physicist William Jackson Humphreys (1862–1945) and the Smithsonian Astrophysical Observatory director Charles Greeley Abbot both proposed in 1913 that volcanic dust could influence climate by blocking solar radiation. Despite these efforts to determine causal mechanisms for climate, most climatologists were content to classify climates. The task of climate classification would also face its own difficulties. The main problem facing climatologists was to decide which weather elements (temperature, precipitation, humidity, cloud cover, prevailing wind) would be adopted to separate one climate from another.
Air flowed into the cyclone from all sides, causing the entire cyclone to spin in a counterclockwise direction. The thermal theory of cyclones required that warm air rise up in cyclones and cold air sink in anticyclones (air columns that rotate clockwise). As long as there were no high-elevation observations, there was no reason to doubt the theory’s validity. By 1900, balloons and kites started carrying thermometers aloft and the returning data did not support the theory. Meteorologists would need a new theory to describe how cyclones, and anticyclones, behaved.
The second held that glacier development was influenced When the extremely small percentage of atmospheric carbon dioxide increases, the atmospheric temperature increases too. 16 Twentieth-Century Science |Weather and Climate Scientist of the Decade: Vilhelm Bjerknes (1862–1951) As did most theoretical meteorologists of the early 20th century, the Norwegian Vilhelm Friman Koren Bjerknes began to study the atmosphere after receiving his doctorate in physics. His father, Carl Anton Bjerknes (1825–1903), was a physicist, and young Vilhelm was immersed in physics from an early age.