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Author
Chen, X. ; Zhang, Y. ; Zhang, M. ; Feng, Y. ; Wu, Z. ; Qiao, F. ; Huang, N.E.
Title
Intercomparison between observed and simulated variability in global ocean heat content using empirical mode decomposition, part I: modulated annual cycle
Type
$loc['typeJournal Article']
Year
2013
Publication
Climate Dynamics
Abbreviated Journal
Clim Dyn
Volume
41
Issue
11-12
Pages
2797-2815
Keywords
Ocean heat content ; Modulated annual cycle ; Empirical mode decomposition ; Instantaneous frequency ; Instantaneous amplitude ; CMIP3
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Edition
ISSN
0930-7575
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Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
209
Permanent link to this record
Author
Deng, J. ; Wu, Z. ; Zhang, M. ; Huang, N.E. ; Wang, S. ; Qiao, F.
Title
Data concerning statistical relation between obliquity and Dansgaard-Oeschger events
Type
$loc['typeJournal Article']
Year
2019
Publication
Abbreviated Journal
Data Brief
Volume
23
Issue
Pages
Keywords
Dansgaard-Oeschger events ; Obliquity ; Surrogate data ; Time-varying Shannon entropy
Abstract
Data presented are related to the research article entitled “Using Holo-Hilbert spectral analysis to quantify the modulation of Dansgaard-Oeschger events by obliquity” (J. Deng et al., 2018). The datasets in Deng et al. (2018) are analyzed on the foundation of ensemble empirical mode decomposition (EEMD) (Z.H. Wu and N.E. Huang, 2009), and reveal more occurrences of Dansgaard-Oeschger (DO) events in the decreasing phase of obliquity. Here, we report the number of significant high Shannon entropy (SE) (C.E. Shannon and W. Weaver, 1949) of 95% significance level of DO events in the increasing and decreasing phases of obliquity, respectively. First, the proxy time series are filtered by EEMD to obtain DO events. Then, the time-varying SE of DO modes are calculated on the basis of principle of histogram. The 95% significance level is evaluated through surrogate data (T. Schreiber and A. Schmitz, 1996). Finally, a comparison between the numbers of SE values that are larger than 95% significance level in the increasing and decreasing phases of obliquity, respectively, is reported.
Address
Key Laboratory of Marine Sciences and Numerical Modelling, Ministry of Natural Resources, Qingdao 266061, PR China
Corporate Author
Thesis
Publisher
Place of Publication
Editor
Language
English
Summary Language
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Series Editor
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Series Volume
Series Issue
Edition
ISSN
2352-3409
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strtoupper('3').strtolower('1372394'); strtoupper('P').strtolower('MC6660458')
Approved
$loc['no']
Call Number
COAPS @ user @
Serial
1068
Permanent link to this record
Author
Deng, J. ; Wu, Z. ; Zhang, M. ; Huang, N.E. ; Wang, S. ; Qiao, F.
Title
Using Holo-Hilbert spectral analysis to quantify the modulation of Dansgaard-Oeschger events by obliquity
Type
$loc['typeJournal Article']
Year
2018
Publication
Quaternary Science Reviews
Abbreviated Journal
Quaternary Science Reviews
Volume
192
Issue
Pages
282-299
Keywords
Pleistocene ; Paleoclimatology ; Greenland ; Antarctica ; Data treatment ; Data analysis ; Dansgaard-oeschger (DO) events ; Obliquity forcing ; Phase preference ; Holo-hilbert spectral analysis ; Amplitude modulation ; EMPIRICAL MODE DECOMPOSITION ; GREENLAND ICE-CORE ; NONSTATIONARY TIME-SERIES ; ABRUPT CLIMATE-CHANGE ; LAST GLACIAL PERIOD ; NORTH-ATLANTIC ; MILLENNIAL-SCALE ; RECORDS ; VARIABILITY ; CYCLE
Abstract
Astronomical forcing (obliquity and precession) has been thought to modulate Dansgaard-Oeschger (DO) events, yet the detailed quantification of such modulations has not been examined. In this study, we apply the novel Holo-Hilbert Spectral Analysis (HHSA) to five polar ice core records, quantifying astronomical forcing's time-varying amplitude modulation of DO events and identifying the preferred obliquity phases for large amplitude modulations. The unique advantages of HHSA over the widely used windowed Fourier spectral analysis for quantifying astronomical forcing's nonlinear modulations of DO events is first demonstrated with a synthetic data that closely resembles DO events recorded in Greenland ice cores (NGRIP, GRIP, and GISP2 cores on GICC05 modelext timescale). The analysis of paleoclimatic proxies show that statistically significantly more frequent DO events, with larger amplitude modulation in the Greenland region, tend to occur in the decreasing phase of obliquity, especially from its mean value to its minimum value. In the eastern Antarctic, although statistically significantly more DO events tend to occur in the decreasing obliquity phase in general, the preferred phase of obliquity for large amplitude modulation on DO events is a segment of the increasing phase near the maximum obliquity, implying that the physical mechanisms of DO events may be different for the two polar regions. Additionally, by using cross-spectrum and magnitude-squared analyses, Greenland DO mode at a timescale of about 1400 years leads the Antarctic DO mode at the same timescale by about 1000 years. (C) 2018 Elsevier Ltd. All rights reserved.
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ISSN
0277-3791
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$loc['no']
Call Number
COAPS @ user @
Serial
971
Permanent link to this record
Author
Huang, N.E. ; Wu, Z. ; Long, S.R. ; Arnold, K.C. ; Chen, X. ; Blank, K.
Title
On Instantaneous Frequency
Type
$loc['typeJournal Article']
Year
2009
Publication
Advances in Adaptive Data Analysis
Abbreviated Journal
Adv. Adapt. Data Anal.
Volume
01
Issue
02
Pages
177-229
Keywords
Instantaneous frequency ; Hilbert transform ; quadrature ; empirical mode decomposition ; normalized intrinsic mode function ; empirical AM/FM decomposition
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ISSN
1793-5369
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$loc['no']
Call Number
COAPS @ mfield @
Serial
668
Permanent link to this record
Author
Huang, N.E. ; Wu, Z. ; Pinzón, J.E. ; Parkinson, C.L. ; Long, S.R. ; Blank, K. ; Gloersen, P. ; Chen, X.
Title
Reductions Of Noise And Uncertainty In Annual Global Surface Temperature Anomaly Data
Type
$loc['typeJournal Article']
Year
2009
Publication
Advances in Adaptive Data Analysis
Abbreviated Journal
Adv. Adapt. Data Anal.
Volume
01
Issue
03
Pages
447-460
Keywords
Global temperature change ; down sampling ; HHT filtering
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1793-5369
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$loc['no']
Call Number
COAPS @ mfield @
Serial
671
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Author
Wu, Z. ; Huang, N.E.
Title
Ensemble Empirical Mode Decomposition: A Noise-Assisted Data Analysis Method
Type
$loc['typeJournal Article']
Year
2009
Publication
Advances in Adaptive Data Analysis
Abbreviated Journal
Adv. Adapt. Data Anal.
Volume
01
Issue
01
Pages
1-41
Keywords
Empirical Mode Decomposition (EMD) ; ensemble empirical mode decompositions ; noise-assisted data analysis (NADA) ; Intrinsic Mode Function (IMF) ; shifting stoppage criteria ; end effect reduction Read More: http://www.worldscientific.com/doi/abs/10.1142/S1793536909000047
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1793-5369
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$loc['no']
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COAPS @ mfield @
Serial
667
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Author
Wu, Z. ; Huang, N.E. ; Chen, X.
Title
The Multi-Dimensional Ensemble Empirical Mode Decomposition Method
Type
$loc['typeJournal Article']
Year
2009
Publication
Advances in Adaptive Data Analysis
Abbreviated Journal
Adv. Adapt. Data Anal.
Volume
01
Issue
03
Pages
339-372
Keywords
Empirical mode decomposition (EMD) ; ensemble empirical mode decomposition (EEMD) ; minimal scale principle ; pseudo multi-dimensional ensemble empirical mode decomposition ; multi-dimensional ensemble empirical mode decomposition
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1793-5369
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$loc['no']
Call Number
COAPS @ mfield @
Serial
669
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Author
Wu, Z. ; Huang, N.E. ; Wallace, J.M. ; Smoliak, B.V. ; Chen, X.
Title
On the time-varying trend in global-mean surface temperature
Type
$loc['typeJournal Article']
Year
2011
Publication
Climate Dynamics
Abbreviated Journal
Clim Dyn
Volume
37
Issue
3-4
Pages
759-773
Keywords
Global warming trend ; Multidecadal variability ; Ensemble empirical mode decomposition ; IPCC AR4
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ISSN
0930-7575
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Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
299
Permanent link to this record