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Kayla Holleman Variability of Submarine Groundwater Discharge in Honokohau Harbor, Hawaii Kayla Holleman Craig Glenn Henrieta Dulaiova.

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Presentation on theme: "Kayla Holleman Variability of Submarine Groundwater Discharge in Honokohau Harbor, Hawaii Kayla Holleman Craig Glenn Henrieta Dulaiova."— Presentation transcript:

1 Kayla Holleman Variability of Submarine Groundwater Discharge in Honokohau Harbor, Hawaii Kayla Holleman Craig Glenn Henrieta Dulaiova

2 Submarine Groundwater Discharge (SGD) IntroductionResultsConclusionsMethods SGD

3 Submarine Groundwater Discharge (SGD) SGD is the discharge of fluids of any composition SGD is a naturally occurring phenomenon SGD is temporally and spatially different Source of anthropogenic and naturally occurring nutrients IntroductionResultsConclusionsMethods

4 Conservative Tracers IntroductionResultsConclusionsMethods Discrete point source measurements Salinity Temperature Grab Samples Specific Nutrients Total Nutrients

5 Geochemical Tracers IntroductionResultsConclusionsMethods

6 Geochemical Tracers IntroductionResultsConclusions Collect water in cubies Filter sample water through manganese impregnated fibers Analyze fibers via RaDECC Apply 224 Ra/ 223 Ra to T W equation Methods

7 Sample Coverage A A’

8 Vertical Profiles IntroductionMethodsConclusionsResults A A’

9 Dissolved Nutrient Characteristics IntroductionResultsConclusions PO 4 3- ( μ M) Si(OH) 4 ( μ M) NO 3 - ( μ M) Salinity Methods

10 Dissolved Nutrient Characteristics IntroductionResultsConclusions PO 4 3- ( μ M) Si(OH) 4 ( μ M) NO 3 - ( μ M) Salinity Methods

11 Dissolved Nutrient Characteristics IntroductionResultsConclusions PO 4 3- ( μ M) Si(OH) 4 ( μ M) NO 3 - ( μ M) Salinity Methods

12 SGD Flux Jun. 2010Sept. 2010 Number14076 Rn (dpm/L)19.215.9 Average Advection Plume (cm/d)23 SGD Flux Plume (m 3 /d)87.384.8 Average Advection (cm/d)5432 SGD Flux (m 3 /d)202.3118.5

13 Residence Time IntroductionResultsConclusions 223 Ra (dpm/m 3 ) 224 Ra (dpm/m 3 ) Methods

14 Residence Time IntroductionResultsConclusions 223 Ra (dpm/m 3 ) 224 Ra (dpm/m 3 ) T wJUNE = <0.5 day T wSEPTEMBER = 6.2-6.3 days Methods

15 Conclusions IntroductionResultsConclusions The SGD flux within Honokohau Harbor plays a vital role in shaping the composition of the harbor water SGD in Honokohau Harbor occurs as a thin lens of brackish water floating on more dense salt water The nutrients within the harbor are enriched compared to the conservative mixing line demonstrated within the harbor The SGD flux experiences seasonal variability; thus, the residence time is seasonally variable Methods

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