Aquifer Responses to El Niño–Southern Oscillation, Southwest British Columbia
- 8 March 2006
- journal article
- Published by Wiley in Groundwater
- Vol. 44 (4), 595-599
- https://doi.org/10.1111/j.1745-6584.2006.00187.x
Abstract
We used climatological composite analysis to investigate El Niño-Southern Oscillation (ENSO) signals in long-term shallow ground water level observations from four wells in the lower Fraser Valley of British Columbia. Significance of differences between warm-phase, cold-phase, and neutral climate states was assessed with a Monte Carlo bootstrap technique. We also considered time series of local precipitation and streamflow for comparison. Composite annual hyetographs suggest that ENSO precipitation impacts are largely limited to winter and spring, with higher and lower rainfall occurring, respectively, under cold-phase and warm-phase episodes. This is consistent with prior work in the region and is found to be directly reflected in both streamflow and ground water level data. The mean magnitude of ENSO terrestrial hydrologic anomalies can be up to approximately 50% of the average seasonal cycle amplitude. ENSO does not appear to systematically affect annual hydrometeorological cycle timing in this study area. However, relative to the surface hydrologic systems considered, aquifers are observed to retain a stronger memory of seasonal ENSO-related precipitation anomalies, with changes potentially extending through the following summer, presumably reflecting storage effects. Most responses appear to be somewhat nonlinear.Keywords
This publication has 10 references indexed in Scilit:
- A methodology to asess relations between climatic variability and variations in hydrologic time series in the southwestern United StatesJournal of Hydrology, 2004
- Hydrogeologic and climatic influences on spatial and interannual variation of recharge to a tropical karst island aquiferWater Resources Research, 2003
- CLIMATIC AND HYDROLOGIC VARIABILITY IN A COASTAL WATERSHED OF SOUTHWESTERN BRITISH COLUMBIA1Jawra Journal of the American Water Resources Association, 2002
- Prediction of seasonal water-table fluctuations in La Pampa and Buenos Aires, ArgentinaHydrogeology Journal, 2001
- Rehabilitation and analysis of Canadian daily precipitation time seriesAtmosphere-Ocean, 1999
- The relative contributions of summer and cool-season precipitation to groundwater recharge, Spring Mountains, Nevada, USAHydrogeology Journal, 1998
- Canadian Precipitation Patterns Associated with the Southern OscillationJournal of Climate, 1997
- El Niño, La Niña, and the Nonlinearity of Their TeleconnectionsJournal of Climate, 1997
- Statistical Analysis in Climate ResearchPublished by Cambridge University Press (CUP) ,1984
- Correlation Structure and Time Scale of Simple Hydrologic SystemsHydrology Research, 1977