Records |
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. |
Address |
School of Atmospheric Sciences, Nanjing University, Nanjing, Jiangsu Province, People's Republic of China |
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English |
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1364-503X |
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PMID:26953173; PMCID:PMC4792406 |
Approved |
$loc['no'] |
Call Number |
COAPS @ mfield @ |
Serial |
57 |
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Author |
Proshutinsky, A.; Dukhovskoy, D.; Timmermans, M.-L.; Krishfield, R.; Bamber, J.L. |
Title |
Arctic circulation regimes |
Type |
$loc['typeJournal Article'] |
Year |
2015 |
Publication |
Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences |
Abbreviated Journal |
Philos Trans A Math Phys Eng Sci |
Volume |
373 |
Issue |
2052 |
Pages |
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Keywords |
arctic climate variability; circulation regimes; freshwater and heat content |
Abstract |
Between 1948 and 1996, mean annual environmental parameters in the Arctic experienced a well-pronounced decadal variability with two basic circulation patterns: cyclonic and anticyclonic alternating at 5 to 7 year intervals. During cyclonic regimes, low sea-level atmospheric pressure (SLP) dominated over the Arctic Ocean driving sea ice and the upper ocean counterclockwise; the Arctic atmosphere was relatively warm and humid, and freshwater flux from the Arctic Ocean towards the subarctic seas was intensified. By contrast, during anticylonic circulation regimes, high SLP dominated driving sea ice and the upper ocean clockwise. Meanwhile, the atmosphere was cold and dry and the freshwater flux from the Arctic to the subarctic seas was reduced. Since 1997, however, the Arctic system has been under the influence of an anticyclonic circulation regime (17 years) with a set of environmental parameters that are atypical for this regime. We discuss a hypothesis explaining the causes and mechanisms regulating the intensity and duration of Arctic circulation regimes, and speculate how changes in freshwater fluxes from the Arctic Ocean and Greenland impact environmental conditions and interrupt their decadal variability. |
Address |
School of Geographical Sciences, University of Bristol, Bristol, UK |
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English |
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1364-503X |
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PMID:26347536; PMCID:PMC4607701 |
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$loc['no'] |
Call Number |
COAPS @ mfield @ |
Serial |
109 |
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Author |
Powell, M.D.; Cocke, S. |
Title |
Hurricane wind fields needed to assess risk to offshore wind farms |
Type |
$loc['typeJournal Article'] |
Year |
2012 |
Publication |
Proceedings of the National Academy of Sciences of the United States of America |
Abbreviated Journal |
Proc Natl Acad Sci U S A |
Volume |
109 |
Issue |
33 |
Pages |
E2192; author reply E2193-4 |
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ISSN |
0027-8424 |
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PMID:22829670; PMCID:PMC3421164 |
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$loc['no'] |
Call Number |
COAPS @ mfield @ |
Serial |
241 |
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Author |
Adams, D.K.; McGillicuddy, D.J.J.; Zamudio, L.; Thurnherr, A.M.; Liang, X.; Rouxel, O.; German, C.R.; Mullineaux, L.S. |
Title |
Surface-generated mesoscale eddies transport deep-sea products from hydrothermal vents |
Type |
$loc['typeJournal Article'] |
Year |
2011 |
Publication |
Science (New York, N.Y.) |
Abbreviated Journal |
Science |
Volume |
332 |
Issue |
6029 |
Pages |
580-583 |
Keywords |
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Abstract |
Atmospheric forcing, which is known to have a strong influence on surface ocean dynamics and production, is typically not considered in studies of the deep sea. Our observations and models demonstrate an unexpected influence of surface-generated mesoscale eddies in the transport of hydrothermal vent efflux and of vent larvae away from the northern East Pacific Rise. Transport by these deep-reaching eddies provides a mechanism for spreading the hydrothermal chemical and heat flux into the deep-ocean interior and for dispersing propagules hundreds of kilometers between isolated and ephemeral communities. Because the eddies interacting with the East Pacific Rise are formed seasonally and are sensitive to phenomena such as El Nino, they have the potential to introduce seasonal to interannual atmospheric variations into the deep sea. |
Address |
Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA. dadams@whoi.edu |
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English |
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ISSN |
0036-8075 |
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Funding |
PMID:21527710 |
Approved |
$loc['no'] |
Call Number |
COAPS @ mfield @ |
Serial |
307 |
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Author |
Zeng, H.; Chambers, J.Q.; Negron-Juarez, R.I.; Hurtt, G.C.; Baker, D.B.; Powell, M.D. |
Title |
Impacts of tropical cyclones on U.S. forest tree mortality and carbon flux from 1851 to 2000 |
Type |
$loc['typeJournal Article'] |
Year |
2009 |
Publication |
Proceedings of the National Academy of Sciences of the United States of America |
Abbreviated Journal |
Proc Natl Acad Sci U S A |
Volume |
106 |
Issue |
19 |
Pages |
7888-7892 |
Keywords |
Biodiversity; Biomass; Carbon; *Cyclonic Storms; Ecosystem; Greenhouse Effect; Models, Statistical; Southeastern United States; *Trees; United States |
Abstract |
Tropical cyclones cause extensive tree mortality and damage to forested ecosystems. A number of patterns in tropical cyclone frequency and intensity have been identified. There exist, however, few studies on the dynamic impacts of historical tropical cyclones at a continental scale. Here, we synthesized field measurements, satellite image analyses, and empirical models to evaluate forest and carbon cycle impacts for historical tropical cyclones from 1851 to 2000 over the continental U.S. Results demonstrated an average of 97 million trees affected each year over the entire United States, with a 53-Tg annual biomass loss, and an average carbon release of 25 Tg y(-1). Over the period 1980-1990, released CO(2) potentially offset the carbon sink in forest trees by 9-18% over the entire United States. U.S. forests also experienced twice the impact before 1900 than after 1900 because of more active tropical cyclones and a larger extent of forested areas. Forest impacts were primarily located in Gulf Coast areas, particularly southern Texas and Louisiana and south Florida, while significant impacts also occurred in eastern North Carolina. Results serve as an important baseline for evaluating how potential future changes in hurricane frequency and intensity will impact forest tree mortality and carbon balance. |
Address |
Department of Ecology and Evolutionary Biology, Tulane University, 400 Boggs Center, New Orleans, LA 70118, USA. hzeng@tulane.edu |
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0027-8424 |
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PMID:19416842; PMCID:PMC2683102 |
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$loc['no'] |
Call Number |
COAPS @ mfield @ |
Serial |
658 |
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Author |
Misra, V.; Mishra, A.; Bhardwaj, A.; Viswanthan, K.; Schmutz, D. |
Title |
The potential role of land cover on secular changes of the hydroclimate of Peninsular Florida |
Type |
$loc['typeJournal Article'] |
Year |
2018 |
Publication |
Climate and Atmospheric Science |
Abbreviated Journal |
Clim Atmos Sci |
Volume |
1 |
Issue |
1 |
Pages |
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2397-3722 |
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$loc['no'] |
Call Number |
COAPS @ mfield @ |
Serial |
833 |
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Author |
Yin, J.; Schlesinger, M.E.; Stouffer, R.J. |
Title |
Model projections of rapid sea-level rise on the northeast coast of the United States |
Type |
$loc['typeJournal Article'] |
Year |
2009 |
Publication |
Nature Geoscience |
Abbreviated Journal |
Nature Geosci |
Volume |
2 |
Issue |
4 |
Pages |
262-266 |
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1752-0894 |
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$loc['no'] |
Call Number |
COAPS @ mfield @ |
Serial |
394 |
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Author |
Shin, D. W.; O'Brien, J. J. |
Title |
A Note on Korean Monsoon Energetics |
Type |
$loc['typeJournal Article'] |
Year |
2003 |
Publication |
Korean Journal of Atmospheric Sciences |
Abbreviated Journal |
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Volume |
6 |
Issue |
1 |
Pages |
55-61 |
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$loc['no'] |
Call Number |
COAPS @ mfield @ |
Serial |
879 |
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Author |
Kanamitsu, M.; Yulaeva, E.; Li, H.; Hong, S.-Y. |
Title |
Catalina Eddy as revealed by the historical downscaling of reanalysis |
Type |
$loc['typeJournal Article'] |
Year |
2013 |
Publication |
Asia-Pacific Journal of Atmospheric Sciences |
Abbreviated Journal |
Asia-Pacific J Atmos Sci |
Volume |
49 |
Issue |
4 |
Pages |
467-481 |
Keywords |
Catalina Eddy; vorticity; diurnal variation; sea breeze |
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ISSN |
1976-7633 |
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$loc['no'] |
Call Number |
COAPS @ mfield @ |
Serial |
194 |
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Author |
Hong, S.-Y.; Park, H.; Cheong, H.-B.; Kim, J.-E.E.; Koo, M.-S.; Jang, J.; Ham, S.; Hwang, S.-O.; Park, B.-K.; Chang, E.-C.; Li, H. |
Title |
The Global/Regional Integrated Model system (GRIMs) |
Type |
$loc['typeJournal Article'] |
Year |
2013 |
Publication |
Asia-Pacific Journal of Atmospheric Sciences |
Abbreviated Journal |
Asia-Pacific J Atmos Sci |
Volume |
49 |
Issue |
2 |
Pages |
219-243 |
Keywords |
Numerical weather prediction; seasonal prediction; general circulation model; regional climate modeling; physics; parameterization; climate modeling; GRIMs; WRF |
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1976-7633 |
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$loc['no'] |
Call Number |
COAPS @ mfield @ |
Serial |
215 |
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