Presentation - National Water Research Institute

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Microbial water quality standards for marine recreational bathing waters. Public beaches with >50,000 visitors/year mandated to participate in water quality monitoring programs. Microbial water quality assessed from concentration of fecal indicator bacteria (FIB; US EPA). Beach closures and postings when levels are exceeded. Observed diel cycles in surf zone › lower bacteria levels during the day Diel cycling attributed to: › UV radiation-induced mortality › biological predation › oxidative stress from natural photochemically-produced oxidizing agents like H 2 O 2
Field measurements in surface seawater over last two decades (review Clark et al., 2008). Prior measurements in mid-ocean and near-shore waters Concentrations from
Page 2 and 3: Why is peroxide important? Typical
Page 6 and 7: Endogenous conc.of 100 nM and 10 00
Page 8 and 9: Photochemical production from CDOM
Page 10 and 11: CDOM refers to a spectrum of highly
Page 12 and 13: H 2 O 2 levels had never been direc
Page 14 and 15: Change in %Fluorescence Refridgera
Page 16 and 17: Seal Beach Doheny State Beach
Page 18 and 19: [H 2 O 2 ] (nM) Measured in salt
Page 20 and 21: Production Rate (nM/s) HPPR incre
Page 22 and 23: HPPR varied significantly (5x) for
Page 24 and 25: concentration (nM) 200 180 160 140
Page 26 and 27: 24 hour diel study at HSB, 30 min i
Page 28 and 29: 4 diel studies in surf zone waters
Page 30 and 31: Field study 2 Clark et al., Marine
Page 32 and 33: Field study 4 Clark et al., Marine
Page 34 and 35: Absorption coefficients used as a p
Page 36 and 37: Prior studies: › H 2 O 2 from dec
Page 38 and 39: Measured photochemical production o
Page 40 and 41: Beach sand contained dark magnetic
Page 42 and 43: The oxidant H 2 O 2 is photochemica
Page 44: Scott Jakubowski Liannea Litz Cha

Presentation - National Water Research Institute

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