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ETD Abstract Container

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A New Monthly Pressure Dataset Poleward of 60°S since 1957

Clark, Logan Nicholas
http://rave.ohiolink.edu/etdc/view?acc_num=ouashonors1524761975172787

Abstract Details

2018, Bachelor of Sciences, Ohio University, Geography.
The major work in this study involved the creation of a new pressure dataset with monthly resolution poleward of 60°S, from 1957-2016. Before this was accomplished, the stationarity of the relationships between Antarctica and regions in the midlatitudes was examined using the a climate model simulation spanning the entire 20th century. From this analysis, it is determined that the strength of pressure relationships between Antarctica and the midlatitudes of the Southern Hemisphere remain steady throughout the 20th century, including during the late 20th century, even when ozone depletion was observed. Further analysis using the climate model simulations determined that the seasonal and monthly reconstructions using the kriging interpolation scheme on a subset of model gridpoints performed at a very high skill compared to the full climate model data, providing confidence that this interpolation method is reliable and robust for Antarctic pressure. Given these results, observed pressure anomalies spanning the Antarctic continent were then interpolated using the kriging technique to generate the new monthly pressure reconstruction; the reconstruction was in good agreement when evaluated to ERA-Interim, and considerably outperformed first-generation reanalysis products. The 20th century reanalyses tend to have better agreement with the reconstruction when comparing the interannual variability and trends for the period of overlap. CERA-20C agrees the most with the reconstruction based on interpolated pressure observations. Notably, the gridded reanalyses have a tendency to produce stronger negative trends when compared to the newly generated reconstruction, and tend to miss or underestimate periods of positive pressure trends. While the skill of the reconstruction is very high over the Antarctic continent, it is much weaker in parts of the South Pacific, which limits the understanding of long-term pressure variability in this region.
Ryan Fogt (Advisor)
100 p.
Climate Change; Meteorology
Antarctic Pressure Variability

Recommended Citations

Citations

  • Clark, L. N. (2018). A New Monthly Pressure Dataset Poleward of 60°S since 1957 [Undergraduate thesis, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ouashonors1524761975172787

    APA Style (7th edition)

  • Clark, Logan. A New Monthly Pressure Dataset Poleward of 60°S since 1957. 2018. Ohio University, Undergraduate thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ouashonors1524761975172787.

    MLA Style (8th edition)

  • Clark, Logan. "A New Monthly Pressure Dataset Poleward of 60°S since 1957." Undergraduate thesis, Ohio University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ouashonors1524761975172787

    Chicago Manual of Style (17th edition)

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© 2018, all rights reserved.
This open access ETD is published by Ohio University Art and Sciences Honors Theses and OhioLINK.