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Erik Johnson TCBES Masters program University of Hawaii at Hilo

Surface water metabolism potential of groundwater-fed near shore waters on the leeward coast of the Island of Hawaii. Erik Johnson TCBES Masters program University of Hawaii at Hilo. Groundwater discharge. Major source of freshwater to Leeward Hawaii Groundwater introduces nutrients

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Erik Johnson TCBES Masters program University of Hawaii at Hilo

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  1. Surface water metabolism potential of groundwater-fed near shore waters on the leeward coast of the Island of Hawaii Erik Johnson TCBES Masters program University of Hawaii at Hilo

  2. Groundwater discharge • Major source of freshwater to Leeward Hawaii • Groundwater introduces nutrients • Nitrogen and phosphorus • Nutrients stimulate productivity • algal blooms

  3. Surface Water Metabolism (MET) • MET= gross primary production (GPP) -respiration (RESP) • GPP > RESP • Autotrophic • CO2 sink • GPP < RESP • Heterotrophic • CO2 source

  4. Hypotheses • pMET higher within groundwater plumes • Groundwater introduces nutrients • pMET higher in wet seasons • Higher nutrient concentrations

  5. Study sites • Kiholo Bay • Undeveloped • Kaloko-Honokohau • Developed • Well documented groundwater inputs

  6. Sample collection • 6 stations • 3 in-plume, 3 out-plume • Monthly for 1 year Salinity at Kaloko-Honokohau Kaloko-Honokohau, Feb 12, 2011

  7. Kaloko-Honokohau, Feb 2011

  8. Mahalo! Acknowledgments: Tracy Wiegner Jason Adolf Matthew Church Judy Walker Rebecca Most EPSCOR III NSF PRISM

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