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  • 1
    Electronic Resource
    Electronic Resource
    Pre-Quaternary Milankovitch frequencies (1989)
    [s.l.] : Nature Publishing Group
    Nature 342 (1989), S. 133-133 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIRá€"According to the Milankovitch theory1'2 external climatic forcing results from changes in the orbital parameters of the Earth's path around the Sun which affect the amount of solar radiation received at the top of the atmosphere. The main periods during the past 5 Myr of the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/342133b0
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  • 2
    Electronic Resource
    Electronic Resource
    Orbital forced frequencies in the 975 000 year pollen record from Tenagi Philippon (Greece) (1995)
    Springer
    Climate dynamics 11 (1995), S. 4-24 
    Details
    ISSN: 1432-0894
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Frequency analysis was applied to different time series obtained from the 975 ka pollen record of Tenagi Philippon (Macedonia, Greece). These time series are characteristic of different vegetation types related to specific climatic conditions. Time control of the 196 m deep core was based on 11 finite 14C dates in the upper 17 m, magnetostratigraphy and correlation with the marine oxygen isotope stratigraphy. Maximum entropy spectrum analyses and thomson multitaper spectrum analysis were applied using the complete time series. Periods of 95–99, 40–45, 24.0–25.5 and 19–21 ka which can be related to orbital forcing, as well as periods of about 68, 30 ka and of about 15.5, 13.5, 12 and 10.5 ka were detected. The detected periods of about 68, 30 ka and 16, 14, 12, 10.5 ka are likely to be harmonics and combination tones of the periods related to orbital forcing. The period of around 30 ka is possibly a secondary peak of obliquity. To study the stability of the detected periods through time, analysis with a moving window was employed. Signals in the eccentricity band were detected clearly during the last 650 ka. In the precession band, detected periods of about 24 ka show an increase in amplitude during the last 650 ka. The evolution of orbital frequencies during the last 1.0 Ma is in general agreement with the results of other marine and continental time series. Time series related to different climatic settings showed a different response to orbital forcing. Time series of vegetational elements sensitive to changes in net precipitation were forced in the precession and obliquity bands. changes in precession caused changes in the monsoon system, which indirectly had a strong influence on the climatic history of Greece. Time series of vegetational elements which are more indicative of changes in annual temperature are forced in the eccentricity band.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00220674
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  • 3
    Electronic Resource
    Electronic Resource
    Ice-sheet growth and high-latitudes sea-surface temperature (1996)
    Springer
    Climate dynamics 12 (1996), S. 441-448 
    Details
    ISSN: 1432-0894
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The response of the LLN 2-D climate model to the insolation and CO2 forcings during the Eemian interglacial is compared to reconstructions obtained from deep-sea cores drilled in the Norwegian Sea and in the North Atlantic. Both reconstructions and modeling results show a decrease of sea-surface temperature (SST) in the higher latitudes (70–75°N zonal belt for the model and the Norwegian Sea for the proxy records), associated with a more moderate cooling at lower latitudes (50–55°N and North Atlantic), at the middle of isotopic substage 5e, several millenia before the beginning of continental ice-sheet growth. Such a comparison between the simulated SST and ice volume of the Northern Hemisphere has been extended to the whole last glacial-interglacial cycle. The influence of the insolation forcing on SST and the shortcomings of the model due to its zonal character are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02346817
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  • 4
    Electronic Resource
    Electronic Resource
    Ice-sheet growth and high-latitudes sea-surface temperature (1996)
    Springer
    Climate dynamics 12 (1996), S. 441-448 
    Details
    ISSN: 1432-0894
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract. The response of the LLN 2-D climate model to the insolation and CO2 forcings during the Eemian interglacial is compared to reconstructions obtained from deep-sea cores drilled in the Norwegian Sea and in the North Atlantic. Both reconstructions and modeling results show a decrease of sea-surface temperature (SST) in the higher latitudes (70–75 °N zonal belt for the model and the Norwegian Sea for the proxy records), associated with a more moderate cooling at lower latitudes (50–55 °N and North Atlantic), at the middle of isotopic substage 5e, several millenia before the beginning of continental ice-sheet growth. Such a comparison between the simulated SST and ice volume of the Northern Hemisphere has been extended to the whole last glacial-interglacial cycle. The influence of the insolation forcing on SST and the shortcomings of the model due to its zonal character are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003820050119
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  • 5
    Electronic Resource
    Electronic Resource
    CO2 and Northern Hemisphere ice volume variations over the middle and late Quaternary (1998)
    Springer
    Climate dynamics 14 (1998), S. 537-544 
    Details
    ISSN: 1432-0894
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract  The atmospheric CO2 concentrations have been reconstructed over the past 600 ka based on regression between the Vostok CO2 data and the SPECMAP oxygen isotope values. A lag of 4.5 ka (CO2 preceding δ18O) gives the best results. A polynomial of order 5 explains 66% of the Vostok CO2 variance over the last 220 ka. The Northern Hemisphere ice-sheet volume was simulated over the past 575 ka using the LLN 2-D model, forced by insolation and these statistically reconstructed atmospheric CO2 concentrations. The simulated ice volume fluctuations resemble the deep-sea oxygen isotope variations. CO2 of interglacial level is necessary for explaining both the interglacial at oxygen isotopic stage 11 and our present-day interglacial.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003820050240
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  • 6
    Electronic Resource
    Electronic Resource
    Sensitivity of the LLN climate model to the astronomical and CO2 forcings over the last 200 ky (1998)
    Springer
    Climate dynamics 14 (1998), S. 615-629 
    Details
    ISSN: 1432-0894
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract  The Louvain-la-Neuve climate model (here referred to as the LLN 2-D model has been used extensively to simulate the Northern Hemisphere ice volume under both the insolation and CO2 forcings. The period analysed here covers the last 200 ky. First, sensitivity analyses to constant CO2 concentration were performed. The model was accordingly forced by insolation changes only, the CO2 concentration being kept constant to respectively 210, 250 and 290 ppmv. Results show that the simulated ice volume variations are comparable to the geological reconstructions only when the CO2 concentration is low (210 ppmv) and that the sensitivity of the simulated Northern Hemisphere ice volume to CO2 is not constant through time. Second, three CO2 reconstructions were used to force the LLN 2-D model in addition to insolation. Results show (1) a better agreement with the SPECMAP oxygen isotope time series, in particular as far as the amplitude of the signal is concerned, and (2) that the simulated Northern Hemisphere ice volume is not very sensitive to the slight differences between these three reconstructions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003820050245
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  • 7
    Electronic Resource
    Electronic Resource
    Spectral analysis of climate data (1996)
    Springer
    Surveys in geophysics 17 (1996), S. 619-663 
    Details
    ISSN: 1573-0956
    Keywords: spectral analysis ; geophysical time series analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The complexity of climate variability on all time scales requires the use of several refined tools to unravel its primary dynamics from observations. Indeed, ideas from the theory of dynamical systems have provided new ways of interpreting the information contained in climatic time series. We review the properties of several modern time series analysis methods. Those methods belong to four main classes: Fourier techniques (Blackman-Tukey and Multi-Taper), Maximum Entropy technique, Singular-spectrum techniques and wavelet analysis. Their respective advantages and limitations are illustrated by numerical experiments on synthetic time series. As climate data can be irregularly spaced in time, we also compare three interpolating methods on those time series. Those tests are aimed at showing the pitfalls of the blind use of mathematical or statistical techniques on climate data. We apply those methods to ‘real” climatic data from temperature variations over the last century, and the Vostok ice core deuterium record over the last glacial cycle. Then we show how interpretations on the dynamics of climate can be derived on those time scales.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01931784
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  • 8
    Electronic Resource
    Electronic Resource
    Future Climatic Changes: Are We Entering an Exceptionally Long Interglacial? (2000)
    Springer
    Climatic change 46 (2000), S. 61-90 
    Details
    ISSN: 1573-1480
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Various experiments have been conducted using theLouvain-la-Neuve two-dimensional Northern Hemisphereclimate model (LLN 2-D NH) to simulate climate for thenext 130 kyr into the future. Simulations start withvalues representing the present-day NorthernHemisphere ice sheet, using different scenarios forfuture CO2 concentrations. The sensitivity of themodel to the initial size of the Greenland ice sheet,and to possible impacts of human activities, has alsobeen tested. Most of the natural scenarios indicatethat: (i) the climate is likely to experience a longlasting (∼50 kyr) interglacial; (ii) the next glacialmaximum is expected to be most intense at around 100kyr after present (AP), with a likely interstadial at∼60 kyr AP; and (iii) after 100 kyr AP continentalice rapidly melts, leading to an ice volume minimum 20kyr later. However, the amplitude and, to a lesserextent, the timing of future climatic changes dependon the CO2 scenario and on the initial conditionsrelated to the assumed present-day ice volume.According to our modelling experiments, man'sactivities over the next centuries may significantlyaffect the ice-sheet's behaviour for approximately thenext 50 kyr. Finally, the existence of thresholds inCO2 and insolation, earlier shown to besignificant for the past, is confirmed to be alsoimportant for the future.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005559827189
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  • 9
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    Astronomical theory of climate change (2004)
    EDP Sciences
    Details
    Publication Date: 2004-12-01
    Print ISSN: 1155-4339
    Electronic ISSN: 1764-7177
    Topics: Physics
    Published by EDP Sciences
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  • 10
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    The Climate Response to the Astronomical Forcing (2007)
    Springer
    Details
    Publication Date: 2007-01-09
    Print ISSN: 0038-6308
    Electronic ISSN: 1572-9672
    Topics: Physics
    Published by Springer
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