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Parsimonious patterns in sea surface temperature of the tropical Pacific ocean
DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | 임규호 | - |
dc.contributor.author | 정광오 | - |
dc.date.accessioned | 2017-07-19T08:55:27Z | - |
dc.date.available | 2017-07-19T08:55:27Z | - |
dc.date.issued | 2016-08 | - |
dc.identifier.other | 000000136100 | - |
dc.identifier.uri | https://hdl.handle.net/10371/131423 | - |
dc.description | 학위논문 (석사)-- 서울대학교 대학원 : 지구환경과학부, 2016. 8. 임규호. | - |
dc.description.abstract | A variety of spatiotemporal oscillations have been explored using principal component analysis (PCA) or rotated PCA (RPCA). Recent literature has noted many shortcomings of PCA and RPCA in the investigation of climate variability in a high-dimensional state space. The main issue is that both PCA and RPCA produce spatial patterns full of nonzero loadings, which often encumbers the physical interpretation of intrinsic signatures.
To address this issue, sparse PCA (SPCA) was employed to identify parsimonious patterns in sea surface temperature (SST) of the tropical Pacific Ocean. Sparse regression analysis was also performed using the sparse principal component time series to obtain the associated spatial patterns in mean sea level pressure (MSLP) and surface wind fields. The results were compared with those of PCA and RPCA. The SPCA produced sparse structures pertinent to the variation of SST. The sparse regression successfully revealed the localized atmospheric responses partially connected with the individual eigenmodes of the SST, while the PCA did not identify the centers of variation. The RPCA failed to distinguish each eigenmode in the patial structure and power spectra of the SST anomaly. The RPCA PC time series could not produce any relevant spatial patterns in the regression analysis. | - |
dc.description.tableofcontents | Chapter 1 Introduction 1
Chapter 2 Methods 6 2.1 PCA 6 2.2 RPCA 7 2.3 SPCA 8 2.3.1 Estimation of tuning parameters 10 Chapter 3 Data 15 Chapter 4 Results 17 4.1 SST 17 4.1.1 PCA modes 17 4.1.2 RPCA modes 19 4.1.3 SPCA modes 21 4.2 Regressed MSLP and surface winds 28 4.2.1 Regression against PCs 28 4.2.2 Regression against RPCs 29 4.2.3 Regression against the SPCs 32 Chapter 5 Conclusions 40 Bibliography 43 국문 초록 50 | - |
dc.format | application/pdf | - |
dc.format.extent | 5796201 bytes | - |
dc.format.medium | application/pdf | - |
dc.language.iso | en | - |
dc.publisher | 서울대학교 대학원 | - |
dc.subject | ENSO | - |
dc.subject | SST | - |
dc.subject | SPCA | - |
dc.subject.ddc | 550 | - |
dc.title | Parsimonious patterns in sea surface temperature of the tropical Pacific ocean | - |
dc.type | Thesis | - |
dc.description.degree | Master | - |
dc.citation.pages | 50 | - |
dc.contributor.affiliation | 자연과학대학 지구환경과학부 | - |
dc.date.awarded | 2016-08 | - |
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