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Climate change impacts on streamflow and nutrient loading to Lake Okeechobee

Author

Listed:
  • Jung-Hun Song

    (University of Florida
    Seoul National University
    Seoul National University)

  • Satbyeol Shin

    (Institute of Food and Agricultural Sciences
    University of Michigan)

  • Yogesh P. Khare

    (The Everglades Foundation
    South Florida Water Management District)

  • Younggu Her

    (University of Florida)

Abstract

Future streamflow and nutrient projections are necessary for the development of sustainable water resources management plans and practices. Watersheds located in the Northern Lake Okeechobee (NLO) areas serve as a source of water and nutrients to Lake Okeechobee and its downstream areas, including the Everglades, in South Florida. This study investigated how projected changes in climate would affect water and nutrient loading to the lake to help develop watershed management plans for improved sustainability of South Florida. Future ensemble climate projections were prepared using the outputs of 29 Coupled Model Intercomparison Project (CMIP) Phase 5 General Circulation Models (GCMs), which were then incorporated into the Watershed Assessment Model (WAM) developed to simulate the streamflow and nutrient loading from the six study drainage watersheds to the lake. The bias-corrected GCMs projected a consistent increase in air temperature in the 2040s and 2070s under both Representative Concentration Pathways (RCPs) 4.5 and 8.5 scenarios. The projected changes in precipitation substantially varied depending on the GCM selections; uncertainty in the multi-model ensemble precipitation projection was propagated to the hydrological projections. The streamflow and nutrient loading projections were closely related to the projected precipitation depths. The modeling experiment results showed that the total phosphorus loads per unit area would be consistently associated with the percentages of pastureland in both historical and future periods. Overall, nutrient loads were projected to increase. Such findings indicate the need for nutrient control strategies and innovative solutions to make progress toward Lake Okeechobee water quality goals in the face of climate change.

Suggested Citation

  • Jung-Hun Song & Satbyeol Shin & Yogesh P. Khare & Younggu Her, 2023. "Climate change impacts on streamflow and nutrient loading to Lake Okeechobee," Climatic Change, Springer, vol. 176(12), pages 1-21, December.
    • Handle: RePEc:spr:climat:v:176:y:2023:i:12:d:10.1007_s10584-023-03660-8
    DOI: 10.1007/s10584-023-03660-8
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    References listed on IDEAS

    as
    1. Shaochun Huang & Harsh Shah & Bibi S. Naz & Narayan Shrestha & Vimal Mishra & Prasad Daggupati & Uttam Ghimire & Tobias Vetter, 2020. "Impacts of hydrological model calibration on projected hydrological changes under climate change—a multi-model assessment in three large river basins," Climatic Change, Springer, vol. 163(3), pages 1143-1164, December.
    2. Yogesh P. Khare & Rajendra Paudel & Ruscena Wiederholt & Anteneh Z. Abiy & Thomas Van Lent & Stephen E. Davis & Younggu Her, 2021. "Watershed Response to Legacy Phosphorus and Best Management Practices in an Impacted Agricultural Watershed in Florida, U.S.A," Land, MDPI, vol. 10(9), pages 1-22, September.
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