Extended Empirical Orthogonal Teleconnection (EEOT) Analysis
Abstract
Earth System Science (ESS) is particularly concerned with understanding coupled earth systems. With the advent of the Earth Observing System, empirical analysis of coupled systems is now greatly facilitated. However, the conventional means of spectral decomposition through Extended EOF (EEOF) is highly susceptible to the determination of components that mix the character of underlying factors. In this paper we present Extended Empirical Orthogonal Teleconnection (EEOT) analysis as a means to address this issue. EEOT is an extension of Empirical Orthogonal Teleconnection analysis - a regression-based form of spectral decomposition that offers the advantage of a natural and automatic form of rotation. In this extended form where multiple image times series are analyzed simultaneously, EEOT provides an opportunity to search for coupled sources of variability. The technique is illustrated through an analysis of the relationship between anomalies in detrended sea surface temperature, middle tropospheric temperature and lower stratospheric temperature for the 30-year period from 1982-2011. One of the predominant patterns found is a pan-tropical Atmospheric Bridge effect whereby ENSO ocean forcing is propagated throughout the tropical troposphere with feedbacks to the Atlantic and Indian ocean basins.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2012
- Bibcode:
- 2012AGUFMIN21D..05E
- Keywords:
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- 1914 INFORMATICS / Data mining;
- 1920 INFORMATICS / Emerging informatics technologies;
- 1980 INFORMATICS / Spatial analysis and representation;
- 1988 INFORMATICS / Temporal analysis and representation