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| DOI | 10.1175/JCLI-D-20-0427.1 |
| Intraseasonal oscillation indices from complex EOFs | |
| Bürger G. | |
| 发表日期 | 2021 |
| ISSN | 0894-8755 |
| 起始页码 | 107 |
| 结束页码 | 122 |
| 卷号 | 34期号:1 |
| 英文摘要 | Indices of oscillatory behavior are conveniently obtained by projecting the fields in question into a phase space of a few (mostly just two) dimensions; empirical orthogonal functions (EOFs) or other, more dynamical, modes are typically used for the projection. If sufficiently coherent and in quadrature, the projected variables simply describe a rotating vector in the phase space, which then serves as the basis for predictions. Using the boreal summer intraseasonal oscillation (BSISO) as a test case, an alternative procedure is introduced: it augments the original fields with their Hilbert transform (HT) to form a complex series and projects it onto its (single) dominant EOF. The real and imaginary parts of the corresponding complex pattern and index are compared with those of the original (real) EOF. The new index explains slightly less variance of the physical fields than the original, but it is much more coherent, partly from its use of future information by the HT. Because the latter is in the way of real-time monitoring, the index can only be used in cases with predicted physical fields, for which it promises to be superior. By developing a causal approximation of the HT, a real-time variant of the index is obtained whose coherency is comparable to the noncausal version, but with smaller explained variance of the physical fields. In test cases the new index compares well to other indices of BSISO. The potential for using both indices as an alternative is discussed. © 2020 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses). |
| 英文关键词 | Mathematical transformations; Nanofluidics; Orthogonal functions; Tropical engineering; Vector spaces; Alternative procedures; Boreal summer intraseasonal oscillation; Empirical Orthogonal Function; Hilbert transform; Intraseasonal oscillations; Oscillatory behaviors; Real and imaginary; Real time monitoring; Phase space methods; Boreal; forecasting method; Madden-Julian oscillation; numerical model; paleoclimate; real time; seasonal variation |
| 语种 | 英语 |
| 来源期刊 | Journal of Climate
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/170981 |
| 作者单位 | Institute of Environmental Science and Geography, University of Potsdam, Potsdam, Germany |
| 推荐引用方式 GB/T 7714 | Bürger G.. Intraseasonal oscillation indices from complex EOFs[J],2021,34(1). |
| APA | Bürger G..(2021).Intraseasonal oscillation indices from complex EOFs.Journal of Climate,34(1). |
| MLA | Bürger G.."Intraseasonal oscillation indices from complex EOFs".Journal of Climate 34.1(2021). |
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