Presentation - National Water Research Institute

More documents

Recommendations

Info

Absorption coefficients used as a proxy for amount of CDOM in natural waters. Average absorption coefficients for each field study ranged from 1.3 to 1.9 m -1 at 300 nm, with overall average of 1.7 ± 0.2 m -1 . Cycling in absorption coefficients and hence CDOM levels was observed on the order of 2 to 4 h, suggesting longshore transport of parcels water with different optical characteristics Absorption coefficients varied with tide; higher values at ebb vs. flood tides. Increases in absorption coefficients at ebb tides suggest inputs from intertidal beach zone. Increased absorption coefficient pulses on flood tides, suggests near-shore CDOM source, possibly due to kelp beds
Significant correlation between sunlight and H 2 O 2 but no significant correlation between absorption coefficient (measure of CDOM levels) and H 2 O 2 Enhanced HPPR (for low abs., low CDOM waters) Variability in HPPR for the same absorbance Enhanced for surf zone waters vs. source waters Increases in H 2 O 2 at ebb and flood tides during night suggest additional non-CDOM production mechanisms are operating in surf zone Samples were filtered so enhanced production rates cannot be due to large particles, algae or plankton, but must be due to dissolved species
Page 2 and 3: Why is peroxide important? Typical
Page 4 and 5: Microbial water quality standards f
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 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

Create successful ePaper yourself

Delete template?

Save as template?