erik johnson tcbes masters program university of hawaii at hilo
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Erik JohnsonTCBES 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
Groundwater discharge
• Major source of freshwater to Leeward Hawaii
• Groundwater introduces nutrients– Nitrogen and phosphorus
• Nutrients stimulate productivity– algal blooms
Surface Water Metabolism (MET)
• MET= gross primary production (GPP) -respiration (RESP)
• GPP > RESP – Autotrophic– CO2 sink
• GPP < RESP– Heterotrophic– CO2 source
Hypotheses
• pMET higher within groundwater plumes– Groundwater introduces nutrients
• pMET higher in wet seasons– Higher nutrient concentrations
Study sites
• Kiholo Bay– Undeveloped
• Kaloko-Honokohau– Developed
• Well documented groundwater inputs
Sample collection• 6 stations
– 3 in-plume, 3 out-plume– Monthly for 1 year
Salinity at Kaloko-Honokohau
Kaloko-Honokohau, Feb 12, 2011
Kaloko-Honokohau, Feb 2011
GPP RESP pMET-5
-2.5
0
2.5
5
7.5
10
In plume
Out plume
mm
ol O
2 m
-3 d
-1
Mahalo!Acknowledgments:
Tracy WiegnerJason Adolf
Matthew ChurchJudy Walker
Rebecca MostEPSCOR III
NSFPRISM
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