Records |
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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0277-3791 |
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$loc['no'] |
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COAPS @ user @ |
Serial |
971 |
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Author |
Hou, T.Y.; Yan, M.P.; Wu, Z. |
Title |
A Variant Of The Emd Method For Multi-Scale Data |
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$loc['typeJournal Article'] |
Year |
2009 |
Publication |
Advances in Adaptive Data Analysis |
Abbreviated Journal |
Adv. Adapt. Data Anal. |
Volume |
01 |
Issue |
04 |
Pages |
483-516 |
Keywords |
Empirical Mode Decomposition (EMD); adaptive data analysis; sparse representation |
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1793-5369 |
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$loc['no'] |
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COAPS @ mfield @ |
Serial |
670 |
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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'] |
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COAPS @ mfield @ |
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669 |
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Author |
Huang, N.E.; Wu, Z.; Long, S.R.; Arnold, K.C.; Chen, X.; Blank, K. |
Title |
On Instantaneous Frequency |
Type |
$loc['typeJournal Article'] |
Year |
2009 |
Publication |
Advances in Adaptive Data Analysis |
Abbreviated Journal |
Adv. Adapt. Data Anal. |
Volume |
01 |
Issue |
02 |
Pages |
177-229 |
Keywords |
Instantaneous frequency; Hilbert transform; quadrature; empirical mode decomposition; normalized intrinsic mode function; empirical AM/FM decomposition |
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1793-5369 |
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$loc['no'] |
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COAPS @ mfield @ |
Serial |
668 |
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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 |
Zhang, M.; Zhang, Y.; Shu, Q.; Zhao, C.; Wang, G.; Wu, Z.; Qiao, F. |
Title |
Spatiotemporal evolution of the chlorophyll a trend in the North Atlantic Ocean |
Type |
$loc['typeJournal Article'] |
Year |
2018 |
Publication |
The Science of the Total Environment |
Abbreviated Journal |
Sci Total Environ |
Volume |
612 |
Issue |
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Pages |
1141-1148 |
Keywords |
Chlorophyll a; Dipole pattern; Multidimensional ensemble empirical mode decomposition; Propagation; Spatiotemporal evolution; The variable trend |
Abstract |
Analyses of the chlorophyll a concentration (chla) from satellite ocean color products have suggested the decadal-scale variability of chla linked to the climate change. The decadal-scale variability in chla is both spatially and temporally non-uniform. We need to understand the spatiotemporal evolution of chla in decadal or multi-decadal timescales to better evaluate its linkage to climate variability. Here, the spatiotemporal evolution of the chla trend in the North Atlantic Ocean for the period 1997-2016 is analyzed using the multidimensional ensemble empirical mode decomposition method. We find that this variable trend signal of chla shows a dipole pattern between the subpolar gyre and along the Gulf Stream path, and propagation along the opposite direction of the North Atlantic Current. This propagation signal has an overlapping variability of approximately twenty years. Our findings suggest that the spatiotemporal evolution of chla during the two most recent decades is part of the multidecadal variations and possibly regulated by the changes of Atlantic Meridional Overturning Circulation, whereas the mechanisms of such evolution patterns still need to be explored. |
Address |
First Institute of Oceanography, State Oceanic Administration, Qingdao, China; Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; Key Laboratory of Data Analysis and Applications, State Oceanic Administration, Qingdao, China. Electronic address: qiaofl@fio.org.cn |
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English |
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ISSN |
0048-9697 |
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PMID:28892858 |
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$loc['no'] |
Call Number |
COAPS @ mfield @ |
Serial |
363 |
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Author |
Wu, Z.; Feng, J.; Qiao, F.; Tan, Z.-M. |
Title |
Fast multidimensional ensemble empirical mode decomposition for the analysis of big spatio-temporal datasets |
Type |
$loc['typeJournal Article'] |
Year |
2016 |
Publication |
Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences |
Abbreviated Journal |
Philos Trans A Math Phys Eng Sci |
Volume |
374 |
Issue |
2065 |
Pages |
20150197 |
Keywords |
adaptive and local data analysis; data compression; empirical orthogonal function; fast algorithm; multidimensional ensemble empirical mode decomposition; principal component analysis |
Abstract |
In this big data era, it is more urgent than ever to solve two major issues: (i) fast data transmission methods that can facilitate access to data from non-local sources and (ii) fast and efficient data analysis methods that can reveal the key information from the available data for particular purposes. Although approaches in different fields to address these two questions may differ significantly, the common part must involve data compression techniques and a fast algorithm. This paper introduces the recently developed adaptive and spatio-temporally local analysis method, namely the fast multidimensional ensemble empirical mode decomposition (MEEMD), for the analysis of a large spatio-temporal dataset. The original MEEMD uses ensemble empirical mode decomposition to decompose time series at each spatial grid and then pieces together the temporal-spatial evolution of climate variability and change on naturally separated timescales, which is computationally expensive. By taking advantage of the high efficiency of the expression using principal component analysis/empirical orthogonal function analysis for spatio-temporally coherent data, we design a lossy compression method for climate data to facilitate its non-local transmission. We also explain the basic principles behind the fast MEEMD through decomposing principal components instead of original grid-wise time series to speed up computation of MEEMD. Using a typical climate dataset as an example, we demonstrate that our newly designed methods can (i) compress data with a compression rate of one to two orders; and (ii) speed-up the MEEMD algorithm by one to two orders. |
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School of Atmospheric Sciences, Nanjing University, Nanjing, Jiangsu Province, People's Republic of China |
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1364-503X |
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PMID:26953173; PMCID:PMC4792406 |
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$loc['no'] |
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COAPS @ mfield @ |
Serial |
57 |
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Author |
Fu, C.B.; Qian, C.; Wu, Z.H. |
Title |
Projection of global mean surface air temperature changes in next 40 years: Uncertainties of climate models and an alternative approach |
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$loc['typeJournal Article'] |
Year |
2011 |
Publication |
Science China Earth Sciences |
Abbreviated Journal |
Sci. China Earth Sci. |
Volume |
54 |
Issue |
9 |
Pages |
1400-1406 |
Keywords |
decadal prediction; global warming; multi-decadal climate variability; the Ensemble Empirical Mode Decomposition; CMIP3 multi-model |
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1674-7313 |
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$loc['no'] |
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COAPS @ mfield @ |
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293 |
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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 |
$loc['typeJournal Article'] |
Year |
2013 |
Publication |
Climate Dynamics |
Abbreviated Journal |
Clim Dyn |
Volume |
41 |
Issue |
11-12 |
Pages |
2797-2815 |
Keywords |
Ocean heat content; Modulated annual cycle; Empirical mode decomposition; Instantaneous frequency; Instantaneous amplitude; CMIP3 |
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0930-7575 |
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$loc['no'] |
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COAPS @ mfield @ |
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209 |
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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 |
$loc['typeJournal Article'] |
Year |
2011 |
Publication |
Climate Dynamics |
Abbreviated Journal |
Clim Dyn |
Volume |
37 |
Issue |
3-4 |
Pages |
759-773 |
Keywords |
Global warming trend; Multidecadal variability; Ensemble empirical mode decomposition; IPCC AR4 |
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0930-7575 |
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$loc['no'] |
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COAPS @ mfield @ |
Serial |
299 |
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