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Tamas, Bodai
기후물리 연구단
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Sources of Nonergodicity for Teleconnections as Cross-Correlations

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Title
Sources of Nonergodicity for Teleconnections as Cross-Correlations
Author(s)
Tamás Bódai; June-Yi Lee; Sundaresan Aneesh
Publication Date
2022-04
Journal
GEOPHYSICAL RESEARCH LETTERS, v.49, no.8
Publisher
AMER GEOPHYSICAL UNION
Abstract
Teleconnections are prominent features of internal variability which, along with climatic means, can also undergo forced changes. The assessment of such changes based on single realization observational data calculating moving window temporal correlation coefficients is burdened by biases. Previously, we attributed one source of such a bias, that is, nonergodicity, to the omission of low-frequency (LF) variability, but find here that it is negligible for typical processes due to their spectral characteristic, given that LF, say, interdecadal, variability is much weaker than the high frequency interannual variability. The unnecessary omission of detrending, as another source, is potentially much more deleterious, as we find that the bias depends quadratically on both the window size and the trends of the means. Given that forced changes in the variances should not introduce much bias, a nonlinear change of the teleconnection strength is implied as the main irreducible source of nonergodicity.
URI
https://pr.ibs.re.kr/handle/8788114/11419
DOI
10.1029/2021GL096587
ISSN
0094-8276
Appears in Collections:
Center for Climate Physics(기후물리 연구단) > 1. Journal Papers (저널논문)
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