Imprints of large‐scale climate oscillations on river flow in selected Canadian river catchments

Abstract We investigated the impacts of six major climate oscillations on river flow at three stations within the Humber catchments (located in Ontario, ON and Newfoundland and Labrador, NL) from 1970 to 2020 using sensitivity and wavelet analyses. Results indicate that the discharge at East Humber...

Full description

Bibliographic Details
Published in:River
Main Authors: Adeyemi Olusola, Samuel Ogunjo, Christiana F. Olusegun
Format: Article in Journal/Newspaper
Language:English
Published: Wiley-VCH 2024
Subjects:
Canada
river discharge
teleconnection indices
wavelet analysis
Oceanography
GC1-1581
River
lake
and water-supply engineering (General)
TC401-506
Newfoundland
North Atlantic
North Atlantic oscillation
Online Access:https://doi.org/10.1002/rvr2.89
https://doaj.org/article/b6a841b494ba431aaf35c1d055dc1a64
Description
Summary:Abstract We investigated the impacts of six major climate oscillations on river flow at three stations within the Humber catchments (located in Ontario, ON and Newfoundland and Labrador, NL) from 1970 to 2020 using sensitivity and wavelet analyses. Results indicate that the discharge at East Humber River near Pine (ON) exhibits the highest statistically significant sensitivity, with 0.304 and 0.394 monthly units to the Dipole Mode Index (DMI) and Tropical North Atlantic (TNA), respectively. Monthly significance analysis also highlights the diverse influence of large‐scale climate oscillations on river flow across the three locations. Wavelet analysis reveals significant active multidecadal oscillations for the North Atlantic Oscillation (NAO) at East Humber River near Pine, with high spectral power. We confirmed that stations within ON demonstrate sensitivities in a similar direction to the large‐scale climate oscillations, contrasting with those observed at NL. The observed inconsistency in the relationship between large‐scale climate oscillations and, for instance, NAO at various locations suggests that the impacts of climate oscillations may manifest differently in different regions. Overall, while inland stations exhibit similar sensitivity patterns, the coastal station demonstrates distinct responses, highlighting the importance of geographical context in understanding the impacts of large‐scale climate oscillations on river flow dynamics.

Similar Items