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Time series analysis of diurnal cycles in small‐scale turbulence
Author(s) -
Chan N. H.,
Kadane J. B.,
Jiang T.
Publication year - 1998
Publication title -
environmetrics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.68
H-Index - 58
eISSN - 1099-095X
pISSN - 1180-4009
DOI - 10.1002/(sici)1099-095x(199805/06)9:3<235::aid-env295>3.0.co;2-q
Subject(s) - series (stratigraphy) , scale (ratio) , mixing (physics) , diurnal cycle , set (abstract data type) , data set , time series , climatology , environmental science , turbulence , simple (philosophy) , mathematics , meteorology , statistical physics , statistics , computer science , geology , physics , geography , cartography , paleontology , philosophy , epistemology , quantum mechanics , programming language
Abstract Two new time series techniques are employed to study the diurnal effect at between 30 and 60 metres depth in the upper equatorial ocean. A modified spectral approach is proposed to identify the period of an unequally spaced series. Based on the exceedances of mixing activities, a new criterion is introduced to identify local nights and days. These two techniques together provide a simple way to demonstrate the existence of the diurnal cycle in deep stratified layers in the ocean. Instead of entertaining complicated models, the proposed approach suggests a simple way to identify the periodicity of an unequally spaced data set of this nature. Similar diurnal effects are detected in the analyses of a subsequent data set. © 1998 John Wiley & Sons, Ltd.