FinalReport - Global Cooling in the 1940s Sudarshan...

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Global Cooling in the 1940’s S udarshan Balakrishnan University of Michigan, Ann Arbor Scripps Institution of Oceanography University of California, San Diego
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Acknowledgements There are many people I’d like to thank for making this project successful. Firstly, I’d like to thank Dr. Veerabhadran Ramanathan for his patient, meticulous and sincere advice during the course of my visit. Secondly, I’d like to thank Yangyang Xu for his insights into my analysis and giving me the necessary resources to complete the project with ease. Lastly, I’d like to thank the people at Scripps for their support without which this project would not be possible.
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Introduction Many climate studies have examined trends in temperature based on the time series of data collected over the last century. When we inspect this at a deeper level, we notice that the 1940’s were characterized by a cooling trend. The 1940’s were characterized by several events that affected the world on a large scale. The question still remains if any particular event caused the cooling during this interval of time. We present an overview of the cooling during this time where the primary task is to isolate the regions and magnitude of the cooling.
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Goals For this project, we seek to look into the following: Analyze the Global regional maps for three intervals of time: I. 1935-1940 II. 1940-1945 III.1945-1950. Investigate the Global Zonal Mean Temperature for a given set of latitudes in these intervals of time. Separate the Global Zonal Mean Temperature and Global Regional Maps into three categories: I. By Land II. By Ocean III. By Land + Ocean Plot the uncertainty in the Global Zonal Mean Temperature by using standard statistical tools Isolate the contribution for a set of latitudes to the temperature trend and separate them based on the interval of time,Land and Ocean.
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Methods Global Regional Maps The frst task For this project was to analyze the global regional maps For three specifc periods oF time. The purpose oF choosing these intervals oF time was to get a clear idea oF how the temperature trend progressed during the mid-Nineteen ±orties. The Global regional maps were plotted using the data provided by the NASA GISS source and the maps gave us a clear picture oF how the temperature changed during the the span oF time. ±or the sake oF convenience we choose to analyze three intervals oF time spaced 5 years From each other, since we space these this uniFormly the trend becomes easier to investigate. Global Zonal Mean Temperature Graphs The Global Zonal Mean Temperature was a graph that was plotted with Temperature versus Latitude. The mean was calculated by taking the gridded temperature data (2º by 2º) For the various latitudes using the NASA GISS source and taking an average oF the temperatures corresponding For a particular latitude. Once the temperatures were obtained we proceed to look into a
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FinalReport - Global Cooling in the 1940s Sudarshan...

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