نتایج جستجو برای: orthogonal functions
تعداد نتایج: 533390 فیلتر نتایج به سال:
Remote sensing data provided the major contribution to the sea surface temperature (SST) field analysis during last several decades. Climate variability of the SST in Northern Atlantic is investigated by using an empirical orthogonal function (EOF) and fuzzy classification techniques. The leading EOF of the wintertime sea-level pressure (SLP) field is more strongly coupled to the surface atmosp...
Monthly climatologies of satellite-derived sea-surface temperature (SST, from AVHRR) and ocean color (from Ocean Color and Temperature Scanner and Sea-viewing Wide-Field-of-view Sensor) around the Gal! apagos Archipelago are used to estimate the mean seasonal cycle of these properties and their relationship to the equatorial circulation in this oceanographically complex region. Harmonic analysi...
[1] Spatiotemporal patterns in soil moisture and vegetation water content across mainland Australia were investigated from 1998 through 2005, using TRMM/TMI passive microwave observations. The Empirical Orthogonal Function technique was used to extract dominant spatial and temporal patterns in retrieved estimates of moisture content for the top 1-cm of soil (q) and vegetation moisture content (...
A streamfunction EOF method is developed to identify long-term thermohaline variations within a strong baroclinic current. The temporal variability associated with meandering fronts and mesoscale eddies is removed by projecting hydrographic data into a baroclinic streamfunction space. The residual field, after removing the streamfunction mean field, is analyzed to find empirical orthogonal func...
In the tropical Atlantic, planktonic fomminfera species are vertically distributed with highest abundances occunfng in the photic zone (approximately 0-100 m). The tropical Atlantic thermocline dips from east to west and varies seasonally due to changes in the southeast and northeast trade winds. In the east, the thermocline is in the photic zone, and in the west, the well-mixed surface layer e...
[1] Anomalous climate is often regulated by the annual cycle. Based on this physical consideration, we propose a new method termed as Season-reliant Empirical Orthogonal Function (S-EOF) analysis to detect major modes of climate variability. The S-EOF analysis of Indo-Pacific SST during the past 54 years reveals two statistically significant leading modes, which are not obtainable by using conv...
Annular patterns with a high degree of zonal symmetry play a prominent role in the natural variability of the atmospheric circulation and its response to external forcing. But despite their apparent importance for understanding climate variability, the processes that give rise to their marked zonally symmetric components remain largely unclear. Here the authors use simple stochastic models in c...
The potential of Neural Networks (NN) to provide accurate estimates of nonlinear interactions for wind wave spectra by means of direct mapping is considered. Expanding on a previously reported feasibility study, an Empirical Orthogonal Functions (EOF) based NN for single peaked spectra is shown to be much more accurate than the well known Discrete Interaction Approximation (DIA), at the expense...
Eigenfunction Expansions for Second-Order Boundary Value Problems with Separated Boundary Conditions
In this paper, we investigate some properties of eigenvalues and eigenfunctions of boundary value problems with separated boundary conditions. Also, we obtain formal series solutions for some partial differential equations associated with the second order differential equation, and study necessary and sufficient conditions for the negative and positive eigenvalues of the boundary value problem....
An approach is proposed which, given a family of linearly independent functions, constructs the appropriate bi-orthogonal set so as to represent the orthogonal projector operator onto the corresponding subspace. The procedure evolves iteratively and it is endowed with the following properties: i) it yields the desired bi-orthogonal functions avoiding the need of inverse operations ii) it allows...
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