ANALYSIS OF THE PRECIPITATION CLIMATE SIGNAL USING EMPIRICAL MODE DECOMPOSITION (EMD) OVER THE CASPIAN CATCHMENT AREA

• Published in: International archives of the photogrammetry, remote sensing and spatial information sciences. Vol. XLII-4/W18; pp. 923 - 929
• Main Authors: Sabzehee, F., Nafisi, V., Iran Pour, S., Vishwakarma, B. D.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Gottingen Copernicus GmbH 19.10.2019; Copernicus Publications
• Subjects: Annual precipitation; Biennial variations; Catchment area; Catchment areas; Correlation coefficient; Correlation coefficients; Decomposition; Empirical analysis; Fast Fourier transformations; Fourier transforms; Frequency domain analysis; Hilbert transformation; Precipitation; Signal processing; Time series; Wavelet transforms
• DOI: 10.5194/isprs-archives-XLII-4-W18-923-2019
• ISSN: 2194-9034; 1682-1750

In this paper, we employ Empirical Mode Decomposition (EMD) together with Hilbert Transform to analyze precipitation time series over the Caspian Sea catchment. Several studies have shown that EMD can extract nonlinear and non-stationary signals better than Fast Fourier Transform (FFT) and Wavelet Transform. EMD decomposes the time series into a finite number of Intrinsic Mode Functions (IMFs) in the time-frequency domain, while FFT helps us operate either in the time or the frequency domain, which fuels limitations such as the inability of nonstationary signal processing and the lack of time transparency. Although Wavelet Transform is shown to be better than FFT, it fails to detect the instantaneous frequencies and needs to have prior information about characteristics of the data. On the other hand, EMD has shown that it is almost able to determine the signal characteristics with no previous assumptions to estimate the instantaneous frequencies of the signal. In this work, EMD is applied to identify the main frequencies of precipitation time series. Thereafter, a statistical procedure is used to identify the prominent IMF of the original signal.We use the correlation coefficient, Minkowski distance and variance test to extract the relevant and prominent IMFs. The results show that IMF 1–3 are the relevant components and are related to annual and biennial variations of precipitation time series over the Caspian catchment during 2003–2016, respectively.