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Oceanic-Atmospheric Variability Influences on Baseflows in the Continental United States

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Abstract

Baseflows are one of the important components of streamflows and the influences of climate change and variability on changes in baseflows in space and time can aid in the management of low flows in watersheds. This study focuses on influences of climate variability on baseflows manifested through individual and coupled oceanic-atmospheric oscillations (viz., Atlantic multidecadal oscillation (AMO), El Niño-southern oscillation (ENSO), Pacific decadal oscillation (PDO), and North Atlantic oscillation (NAO)). Statistically significant differences in monthly baseflows in temporal windows that coincide with two phases (i.e., cool or warm; El Niño or La Niña) of oscillations at 574 gauging across least anthropogenically influenced across the continental the U.S. are evaluated in this study. Nonparametric statistical hypothesis tests are used to analyze these changes. Results from the analyses indicate that the influences of PDO and AMO on baseflows are the largest than other oscillations, and baseflows at only 12.2% of all sites were impacted by ENSO. The New England (01), Mid Atlantic (02), and Souris-Red-Rainy (09) regions displayed statistically significant differences in baseflow in two phases and with dominant influence attributed to the PDO cool phase. A total of 143 stations with higher baseflow median values during NAO warm/cool phase and El Niño. It is noted that the NAO cool phase/El Niño influences regional baseflows in the central U.S. and the NAO warm phase/ La Niña impacts baseflows in the southeastern U.S. The number of sites at which the baseflows were impacted by coupled oscillations was larger than those influenced by one oscillation.

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Data Availability

All data and materials are available from the corresponding author by request.

Abbreviations

AMO:

Atlantic Multidecadal Oscillation

HYSEP:

HYdrograph SEPeration

ENSO:

El Nin ̃o-Southern Oscillation

KDE:

Kernel Density Estimates

HCDN:

Hydro-Climatic Data Network

NAO:

North Atlantic Oscillation

HUC:

Hydrologic Unit Code

PDO:

Pacific Decadal Oscillation

HUC2:

Hydrologic Unit Code two-digit

SST:

Sea Surface Temperature

WRS:

Wilcoxon rank-sum

USGS:

U. S. Geological Survey

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Acknowledgements

The authors thank the United States Geological Survey (USGS) for providing, via their website, the daily streamflow data, that were used in the analysis reported in this study.

Funding

The authors did not receive support from any organization for the submitted work.

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Authors

Contributions

Hao Chen: data analysis, original draft preparation; Ramesh S. V. Teegavarapu: investigation, methodology, writing review and editing; Yue-Ping Xu: supervision, formal analysis.

Corresponding author

Correspondence to Hao Chen.

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Not applicable. This research does not involve human participants and welfare of animals.

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All authors declare no conflict of interest or competing interest.

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Chen, H., Teegavarapu, R.S.V. & Xu, YP. Oceanic-Atmospheric Variability Influences on Baseflows in the Continental United States. Water Resour Manage 35, 3005–3022 (2021). https://doi.org/10.1007/s11269-021-02884-6

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  • DOI: https://doi.org/10.1007/s11269-021-02884-6

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