The latitudinal ozone variability study using wavelet analysis

Werner, R.

doi:10.1016/j.jastp.2007.08.022

Cited by 16 publications

(7 citation statements)

References 23 publications

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“…Continuous wavelet transform Recently, the WCT based on the Morlet function (Morlet et al 1982, Torrence andCompo 1998) has been widely used to identify periodic oscillations of signals (Labat 2005, Werner 2008). Thus, the Morlet function was chosen as the mother wavelet function to detect local temporal patterns in this study, and is given as (Mallat 2009):…”

Section: Methodsmentioning

confidence: 99%

Changes in the long-term hydrological regimes and the impacts of human activities in the main Wei River, China

Zhang

Huang

Zhang

et al. 2016

Hydrological Sciences Journal

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Under the combined influences of climate changes and human activities, the hydrological regimes of the Wei River show remarkable variations which have caused many issues in the Wei River in recent decades such as a lack of freshwater, water pollution, flood disaster, and channel sedimentation. Hence hydrologic regime changes and potential human-induced impacts have been drawing increasing attention from local government and hydrologists. This study investigates hydrological regime changes in the natural and measured runoff series of four hydrologic stations on the main Wei River and quantifies features of their long-term change by analysing their historical annual and seasonal runoff data using several approaches: continuous wavelet transform, cross-wavelet, wavelet coherence, trend-free pre-whitening Mann-Kendall test, and detrended fluctuation analysis. By contrasting two different analysis results between natural and measured river runoff series, the impacts of human activities on the long-term hydrological regime in terms of spatio-temporal distribution in dominant periods, the trends and long-range memory of river runoff were investigated. The results show the following: (1) Periodic properties of the streamflow changes are the result of climate changes and precipitation changes in particular. Human activities play a minor role in the changes in periodic properties. (2) A significant decreasing trend can be observed in the natural streamflow series along the entire main stream of the Wei River, which should be attributed to human-induced influences in recent decades. (3) Decreasing streamflow in the Wei River may trigger serious shortages of freshwater, and the sustainable utilization of water resources in the Wei River basin may face a challenging situation. This study has important implications for the scientific management of water resources and enhancement of human mitigation of climate changes and human-induced water shortage in the Wei River basin.

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Section: Methodsmentioning

confidence: 99%

Changes in the long-term hydrological regimes and the impacts of human activities in the main Wei River, China

Zhang

Huang

Zhang

et al. 2016

Hydrological Sciences Journal

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“…However, it performs poorly when this is not the case. Wavelets perform better for non-stationary and non-smooth time series (Labat, 2005;Labat et al, 2000;Morlet et al, 1982;Partovian et al, 2016;Torrence and Webster, 1998;Werner, 2008). Hence, wavelet analysis is used to detect the variations of the frequency distribution of non-stationary series.…”

Section: Morlet Wavelet Analysismentioning

confidence: 99%

Detection and attribution of abrupt shift in minor periods in human-impacted streamflow

Lan

Zhang

et al. 2020

Journal of Hydrology

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“…It is a periodic function enveloped by a Gaussian function, widely used to identify periodic oscillations in real-life signals (Deng et al, 1997;Wang et al, 2002;Issac et al, 2004;Labat et al, 2005;Werner, 2008). The Morlet wavelet consists of a sinusoidal wave, which is a complex non-orthogonal continuous wavelet.…”

Section: Wavelet Analysismentioning

confidence: 99%

Impact of climatic factors on permafrost of the Qinghai–Xizang Plateau in the time-frequency domain

Gao

Zhang

et al. 2015

Quaternary International

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The latitudinal ozone variability study using wavelet analysis

Cited by 16 publications

References 23 publications

Changes in the long-term hydrological regimes and the impacts of human activities in the main Wei River, China

Changes in the long-term hydrological regimes and the impacts of human activities in the main Wei River, China

Detection and attribution of abrupt shift in minor periods in human-impacted streamflow

Impact of climatic factors on permafrost of the Qinghai–Xizang Plateau in the time-frequency domain

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