Natural climate cycles refer to the regular climate variations that occur without the influence of humans. The natural climate cycle provide a clear overview of how climate change occurs by providing an understanding of the current and future climate cycles. According to Ramanathan and Feng (2009), the variations in climate cycles take place in various time scales on the earth’s surface and may alternate between years, decades, centuries or millennia. The climate cycles that take place at each time scale occur as a result of the varying physical mechanisms. Therefore, the climate changes during these periods are a reflection of the different mechanisms and cycles that are taking place subsequently.
The natural climate cycles can be classified as the millennial natural cycle, Century-scale Climate Cycles and the Interannual to Decadal Climate Cycles. The millennial natural cycle originates from the changes that occur in the earth’s orbit around the sun and the cycles occur in different intensities and time scales. The orbital changes take a shorter time while influencing which part of the earth’s surface will receive solar radiation. The Century-scale climate cycle is influenced by the changes in the sun and ocean circulation patterns, which lead to shorter cold-warm cycles at a time scale of 200-1500 years ( Lean, 2010) . The Interannual to Decadal Climate Cycles occurs in time intervals of years of decades. The climate changes resulting from this cycle is due to the interaction of ocean temperatures and atmospheric patterns.
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The troposphere is the lowest and dense part of the earth’s atmosphere whereas the stratosphere is the second layer of the atmosphere above the earth’s surface. It is at the troposphere where most of the weather changes occur since the temperature drastically decreases. In addition to this, most of the water vapor, dust particles and clouds are found at the troposphere (Anderson, 2002). On the other hand, at the stratosphere dust particles, clouds and water vapor are non-existent, and the temperatures are very low and constant.
References
Anderson D. L. (2002). The inner inner core of Earth. Proceedings of the National Academy of Sciences of the United States of America , 99 (22), 13966–13968. doi:10.1073/pnas.232565899
Lean, J. (2010). Cycles and trends in solar irradiance and climate. Wiley Interdisciplinary Reviews: Climate Change . 1: 111-122.
Ramanathan, V.; Feng, Y. (2009). Air pollution, greenhouse gases and climate change: Global and regional perspectives. Atmospheric Environment. 43: 37-50.
