Wavelet analysis of precipitation extremes over Canadian ecoregions and teleconnections to large‐scale climate anomalies
TLDR
In this article, the authors used wavelet analysis to detect significant interannual and interdecadal oscillations and their teleconnections to large-scale climate anomalies such as El Nino-Southern Oscillation (ENSO), Pacific Decadal Oscillations (PDO), and North Atlantic OscillATION (NAO), monthly and seasonal maximum daily precipitation (MMDP and SMDP) from 131 stations across Canada were analyzed by using variants of wavelet analyses.Abstract:
To detect significant interannual and interdecadal oscillations and their teleconnections to large-scale climate anomalies such as El Nino–Southern Oscillation (ENSO), Pacific Decadal Oscillation (PDO), and North Atlantic Oscillation (NAO), monthly and seasonal maximum daily precipitation (MMDP and SMDP) from 131 stations across Canada were analyzed by using variants of wavelet analysis. Interannual (1–8 years) oscillations were found to be more significant than interdecadal (8–30 years) oscillations for all selected stations, and the oscillations are both spatial and time-dependent. Similarly, the significant wavelet coherence and the phase difference between leading principal components of monthly precipitation extremes and climate indices were highly variable in time and in periodicity, and a single climate index explains less than 40% of the total variability. Partial wavelet coherence analysis shows that both ENSO and PDO modulated the interannual variability and PDO modulated the interdecadal variability, of MMDP over Canada. NAO is correlated with the western MMDP at interdecadal scale and the eastern MMDP at interannual scale. The composite analysis shows that precipitation extremes at about three fourths of the stations have been significantly influenced by ENSO and PDO patterns, while about one half of the stations by the NAO patterns. The magnitude of SMDP in extreme El Nino years, and extreme PDO event of positive phase, was mostly lower (higher) over the Canadian Prairies in summer and winter (spring and autumn) than in extreme La Nina years. Overall, the degree of influence of large-scale climate patterns on Canadian precipitation extremes varies by season and by region.read more
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References
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Journal ArticleDOI
ENSO and Wintertime Extreme Precipitation Events over the Contiguous United States
TL;DR: In this paper, the authors examined the impact of El Nino-Southern Oscillation (ENSO) on precipitation events over the continental United States using 49 winters (1949/50-1997/98) of daily precipitation observations and NCEP-NCAR reanalyses.
Journal ArticleDOI
Impacts of Large-Scale Circulation Variability on Low Streamflows over Canada: A Review
Barrie Bonsal,Amir Shabbar +1 more
TL;DR: In this article, the impacts of large-scale circulation patterns on streamflow variability (including low flows) over Canada are reviewed. But, the results from the various studies reveal that streamflow responses are generally consistent with those observed for large scale climate.
Journal ArticleDOI
Changes in precipitation extremes over the Pearl River Basin, southern China, during 1960–2012
TL;DR: Based on daily precipitation dates at 42 meteorological stations in the Pearl River Basin, the spatial and temporal changes in precipitation index are analyzed during 1960-2012, eleven indices of precipitation extremes are studied.
Journal ArticleDOI
Using U Statistics to Derive the Asymptotic Distribution of Fisher's Z Statistic
TL;DR: In this article, a simple derivation of the asymptotic distribution of Fisher's Z statistic for general bivariate parent distributions F is obtained using U-statistic theory.
Journal ArticleDOI
Spatial and Temporal Variability of Canadian Seasonal Streamflows
Paulin Coulibaly,Donald H. Burn +1 more
TL;DR: In this paper, wavelet and cross-wavelet analysis are used to identify and describe spatial and temporal variability in Canadian seasonal streamflows, and to gain insights into the dynamical relationship between the seasonal streamflow and the dominant modes of climate variability in the Northern Hemisphere.