DOI: 10.1016/j.gloplacha.2016.05.006
论文题名: Spectral analysis of sea level during the altimetry era, and evidence for GIA and glacial melting fingerprints
作者: Spada G. ; Galassi G.
刊名: Global and Planetary Change
ISSN: 0921-8181
出版年: 2016
卷: 143 起始页码: 34
结束页码: 49
语种: 英语
英文关键词: Altimetry era
; Orthonormal functions
; Sea-level change
英文摘要: We study the spatial patterns of the mass and steric components of sea-level change during the "altimetry era" (1992-today), and we characterize them at different scales by the orthonormal functions method. The spectrum of the altimetry-derived rate of sea-level rise is red and decays with increasing wavenumber nearly following a power law with exponent ≈. 2. By analyzing the degree correlation and the admittance function, we find that the altimetric rate of sea-level change is coherent with the total steric field in the whole range of wavelengths considered (down to ≈. 1000 km), but particularly for wavelengths exceeding ≈. 2000 km. Thermosteric and halosteric components are moderately anti-correlated within the range of wavelengths 1000-4000 km. Their power spectrum varies significantly with the wavelength and, for ≈. 2000 km, it is equally partitioned between the two components. The power of regional sea-level variations driven by Glacial Isostatic Adjustment and the melting of continental ice sheets is small compared to that held by the steric component, which explains most of the regional variability shown by the altimetry record. This causes the elusiveness of the "static" sea-level fingerprints, which at present are hidden in the pattern of the residual sea-level (i.e., the altimetry-derived sea-level minus the steric component). However, we find that at harmonic degree 2, mainly associated with rotational variations, the power of glacial melting is significant and it will progressively increase during next century in response to global warming. We also estimate that at the end of the Mid-Holocene the strength of the glacial isostatic readjustment fingerprints was ≈. 10 times larger than today, well above the long-wavelength component of residual sea-level. © 2016 Elsevier B.V. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84971449353&doi=10.1016%2fj.gloplacha.2016.05.006&partnerID=40&md5=2d74cba66b8f4b3890daa259d28f2a4f
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11649
Appears in Collections: 全球变化的国际研究计划 气候变化与战略
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作者单位: Dipartimento di Scienze Pure e Applicate (DiSPeA), Università degli Studi di Urbino Carlo Bo, Urbino, Italy
Recommended Citation:
Spada G.,Galassi G.. Spectral analysis of sea level during the altimetry era, and evidence for GIA and glacial melting fingerprints[J]. Global and Planetary Change,2016-01-01,143.