20th Century Antarctic Pressure Variability and Trends Using a Seasonal Spatial Pressure Reconstruction
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Ohio University / OhioLINK
2017
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| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1491474158428459 |
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ndltd-OhioLink-oai-etd.ohiolink.edu-ohiou14914741584284592021-08-03T07:01:21Z 20th Century Antarctic Pressure Variability and Trends Using a Seasonal Spatial Pressure Reconstruction Goergens, Chad A. Climate Change Atmosphere Atmospheric Sciences Meteorology Geography Antarctica kriging 20th century Antarctic pressure variability Interpolation Climate Across Antarctica, most meteorological observations did not begin until the International Geophysical Year of 1957-58, making it difficult to understand Antarctic climate variability during the early 20th century. To overcome this hurdle, this thesis creates, evaluates, and analyzes several seasonal spatial pressure reconstructions that extend back to 1905 across the Antarctic continent. A kriging interpolation method is used to generate the seasonal spatial pressure reconstruction using 19 Antarctic stations as predictors. Multiple evaluation techniques were used to assess the reliability of the spatial pressure reconstructions when compared to ERA-Interim, which is deemed the most reliable gridded pressure dataset after 1979. From all these evaluation metrics, it is concluded that the most reliable spatial pressure reconstructions are for the summer and winter seasons, but all seasons have enough skill to be useful in interpreting pressure variability throughout the 20th century.Using the newly generated spatial reconstructions, it is clearly seen that the negative pressure trend in the late 20th century across the entire continent in DJF is unique when compared to the 100+ year record. Given this uniqueness and contemporary modeling studies, it is likely that stratospheric ozone depletion plays a leading role in the recent negative Antarctic pressure trends in summer. In contrast, the early 20th century in DJF and the entire 20th century for the other seasons are characterized by interannual variability, with strong decadal-scale variability especially prevalent in winter. This highlights the importance of natural variability in causing the majority of ongoing Antarctic circulation pattern changes. 2017-06-13 English text Ohio University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1491474158428459 http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1491474158428459 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
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NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Climate Change Atmosphere Atmospheric Sciences Meteorology Geography Antarctica kriging 20th century Antarctic pressure variability Interpolation Climate |
| spellingShingle |
Climate Change Atmosphere Atmospheric Sciences Meteorology Geography Antarctica kriging 20th century Antarctic pressure variability Interpolation Climate Goergens, Chad A. 20th Century Antarctic Pressure Variability and Trends Using a Seasonal Spatial Pressure Reconstruction |
| author |
Goergens, Chad A. |
| author_facet |
Goergens, Chad A. |
| author_sort |
Goergens, Chad A. |
| title |
20th Century Antarctic Pressure Variability and Trends Using a Seasonal Spatial Pressure Reconstruction |
| title_short |
20th Century Antarctic Pressure Variability and Trends Using a Seasonal Spatial Pressure Reconstruction |
| title_full |
20th Century Antarctic Pressure Variability and Trends Using a Seasonal Spatial Pressure Reconstruction |
| title_fullStr |
20th Century Antarctic Pressure Variability and Trends Using a Seasonal Spatial Pressure Reconstruction |
| title_full_unstemmed |
20th Century Antarctic Pressure Variability and Trends Using a Seasonal Spatial Pressure Reconstruction |
| title_sort |
20th century antarctic pressure variability and trends using a seasonal spatial pressure reconstruction |
| publisher |
Ohio University / OhioLINK |
| publishDate |
2017 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1491474158428459 |
| work_keys_str_mv |
AT goergenschada 20thcenturyantarcticpressurevariabilityandtrendsusingaseasonalspatialpressurereconstruction |
| _version_ |
1719451848389165056 |