By Renata Dmowska, Barry Saltzman
This sequence offers a venue for longer reports of present advances in geophysics. Written at a degree available to graduate scholars, the articles serve to develop wisdom of varied fields and should be priceless in classes and seminars.
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Concerning the ProductPublished by means of the yankee Geophysical Union as a part of the Geophysical Monograph sequence. content material:
Extra resources for Advances in Geophysics, Vol. 41
We verify that the seasonal shift reported by Thomson Ž1995. is present in this data set and appears strongly concentrated in the continental interiors of the Northern Hemisphere continents. We show that the observed spatial pattern of seasonal shifts is in conﬂict with predictions of the effects of enhancedgreenhouse conditions in two well-known numerical climate models. 1. Global Temperature Data Global surface temperature records provide a long and widespread sampling dating back to the nineteenth century.
L 1, . . , K. The time-domain signal x Ž t . and the envelope ᑬ AŽ t . are formally identical for modes referenced to f 0 0, that is, the secular modes of variability. In the multivariate case, the time-domain signal is reconstructed from the components of its corresponding spectral EOF v1 Ž f 0 .. This reconstruction is not unique and requires additional constraints. 4nN 1 , A˜1Ž n⌬ t . Ž l Žl. Žl. 1 *wn , Ž 17. 1 where 1Ž l . is the lth component of the vector v1Ž f 0 .. The l are the bandwidth retention factors of the Slepian tapers Žsee Park and Maasch, 1993..
Temporal Žleft. and spatial Žright. patterns of reconstructed synthetic signals showing Ža. secular mode, Žb. interdecadal mode, and Žc. interannual mode. Actual reference time-domain signal Žsee Fig. 2. is shown by dashed curve for comparison to reconstructed signal. From Mann Ž1998.. OSCILLATORY SPATIOTEMPORAL SIGNAL DETECTION 45 as discussed later, some of the deﬁciencies inherent in joint-ﬁeld decompositions are avoided when performed in the context of MTM-SVD. In the event where more than one signal is present within the narrow bandwidth of spectral estimation, however, problems and ambiguities similar to those encountered in traditional PCA can arise.
Advances in Geophysics, Vol. 41 by Renata Dmowska, Barry Saltzman