Global reconstruction in application to multichannel communication

1998 ◽  
Vol 57 (2) ◽  
pp. 2455-2457 ◽  
Author(s):  
Vadim S. Anishchenko ◽  
Alexey N. Pavlov
Keyword(s):  
Global Reconstruction

Global reconstruction of surface temperature fields for past equilibrium climates

2020 ◽  
Author(s):  
Julia Hargreaves ◽  
James Annan
Keyword(s):  
Last Glacial Maximum ◽  
Climate Models ◽  
Climate Model ◽  
Glacial Maximum ◽  
Temperature Fields ◽  
Alternative Methods ◽  
Large Network ◽  
Last Glacial ◽  
Uncertainty Estimates ◽  
Global Reconstruction

<p>Paleoclimate simulations are widely used as a test of the ability of climate models to simulate climate states that are substantially different to the present day, and quantitative reconstructions of these climate states is an essential component of model evaluation.  With there being no large network of instrumental observations from these periods, we must rely on inferences from a relatively modest number of unevenly distributed proxy records which are believed to be quantitatively indicative of the climate state.  In order to robustly establish climatic conditions over global scales, we require methods for smoothing and interpolating between these sparse and imperfect estimates.  In recent years, we have worked on this problem and created a global reconstruction of the Last Glacial Maximum [Annan and Hargreaves, 2013, Climate of the Past] using the data and models which were available at that time.  The method uses scaled patterns from the PMIP ensemble of structurally diverse climate simulations, combined with sparse sets of proxy data, to produce spatially coherent and complete  data  fields  for  surface  air  and  sea  temperatures  (potentially  including  the  seasonal cycle)  along  with  uncertainty  estimates  over  the  whole  field.   This  approach  is  more  robust than alternative methods, which either perform a purely statistical interpolation of the data or at best combine the data with a single climate model. Here, we aim to improve the method, update the inputs, and apply the same technique to both Last Glacial Maximum and mid Pliocene climate intervals. As well as generating spatially complete and coherent maps of climate variables, our approach also generates well-calibrated uncertainty estimates.</p>

Error Estimation Techniques Based on Defect Computation and Global Reconstruction

2010 ◽  
Author(s):  
Winfried Auzinger ◽  
Theodore E. Simos ◽  
George Psihoyios ◽  
Ch. Tsitouras
Keyword(s):  
Error Estimation ◽  
Estimation Techniques ◽  
Global Reconstruction

One Method for Restoring Inhomogeneous Attractors

1998 ◽  
Vol 08 (04) ◽  
pp. 825-833 ◽  
Author(s):  
Natalia B. Janson ◽  
Alexey N. Pavlov ◽  
Vadim S. Anishchenko
Keyword(s):  
Time Series ◽  
Simple Form ◽  
The Other ◽  
Phase Portraits ◽  
System Of Differential Equations ◽  
Global Modeling ◽  
Simple Shape ◽  
Biological Origin ◽  
Qualitative Models ◽  
Global Reconstruction

Several methods of restoration of phase portraits were applied to real experimental realizations a(t) of biological origin. The algorithms for global reconstruction were used to create qualitative models of the regimes under study. The results of global modeling were satisfactory for the time series of simple shape, but in case of complicated inhomogeneous realizations the traditional algorithms did not give reasonable models. We suggest a method for restoration of inhomogeneous attractors on a(t) as follows: [Formula: see text] while the other coordinates could be restored by any known methods (delay, differentiation, etc.). Such a representation of the attractor's coordinates preserves a simple form of the first equation of the system of differential equations sought [Formula: see text] This method was tested first on an artificially produced inhomogeneous realization containing pieces with very slow and very quick motion. After that it was successfully applied to real biological inhomogeneous realizations.

scholarly journals Konodontová fauna spodního tournai v Lesním lomu (Brno-Líšeň)

2017 ◽  
Vol 24 (1-2) ◽  
Author(s):  
Vojtěch Cígler ◽  
Tomáš Kumpan
Keyword(s):  
Cold Climate ◽  
Climate System ◽  
Global Reconstruction ◽  
Moravian Karst ◽  
Conodont Fauna

Early Tournaisian was a period of transition between devonian hot and carboniferous cold climate system and therefore crucial in terms of global reconstruction evolution. Early Tournaisian represents a period that follows a detailed studied Hangenberg crisis (late Famenian) and that is connected to glaciation. Based on the study of conodont fauna this article outlines the biostratigraphy of the Lower Tournaisian upper Křtiny limestones situated in the Lesní lom quarry. „Upper“ Křtiny limestones are pale grey mud calciturbidites containing abundant microfauna of conodonts, echinoderms, ostracods, brachiopods, bivalves, bryozoans, ichthyoliths, radiolarians, trilobites and foraminiferas. They are part of the Líšeň Formation which belongs to Paleozoic of Moravian Karst. 8 samples were taken and evaluated from 3 profiles. In total there were determined 22 conodont species belonging to conodont families of Bispathodus, Polygnathus, Pseudopolygnathus and Siphonodella. Following taxons were found: Siphonodella belkai DZIK 1997, Si. carinthiaca SCHÖNLAUB 1970, Si. cf Si. isosticha COOPER 1939, Si. duplicata-jii, Si. jii HASS 1959, Si. lobata BRANSON & MEHL 1934b, Si. obsoleta HASS 1959, Si. sandbergi (M1, M2) KLAPPER 1966, Polygnathus communis communis BRANSON & MEHL 1934b, Po. distortus BRANSON & MEHL 1934b, Po. inornatus BRANSON 1934, Po. purus purus VOGES 1959, Po. spicatus BRANSON 1934, Po. vogesi ZIEGLER 1962, Pseudopolygnathus fusiformis BRANSON & MEHL 1934b, Ps. primus BRANSON & MEHL 1934, Ps. triangulus inaequalis VOGES 1959 and Ps. triangulus triangulus VOGES 1959. Based on the conodont elements the Siphonodella jii and Siphonodella sandbergi zones were distinguished. All profiles but profile 2 belonged to the siphonodellid-polygnathid biofacies, profile 2 belonged to the polygnathid biofacies.

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