erik johnson tcbes masters program university of hawaii at hilo
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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