M. MARVIN- DIPASQUALE B. JAFFE, J. ACKERMAN & G. SHELLENBARGER U.S. GEOLOGICAL SURVEY D. SLOTTON UNIV. CALIFORNIA - DAVIS
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1 MERCURY IN MOTION: An Examination of Mercury Mobilization and Transformation Associated With Wetland Restoration in South San Francisco Bay M. MARVIN- DIPASQUALE B. JAFFE, J. ACKERMAN & G. SHELLENBARGER U.S. GEOLOGICAL SURVEY D. SLOTTON UNIV. CALIFORNIA - DAVIS
2 USGS Na=onal Research Program Biogeochemistry at Regional Scales EVANGELOS KAKOUROS Chemist ICP- MS Guru Field & Lab technician JENNIFER AGEE Biologist Lab Manager, Data Guru LISAMARIE WINDHAM- MYERS TRAVIS CONLEY Wetland Ecologist; Ph.D. Student Intern Field & Lab technician LE KIEU Biologist Field & Lab technician MICHELLE ARIAS Physical Science Field & Lab technician
3 Western U.S. Mercury in Mo=on 3 Short Stories (California) I. 26 & 212 Deep Cores / Bed Sediment & Hg Mobiliza=on II. Pond A8 Notch Opening / Biosen=nal Toolbox III. Water Column Hg Flux / 24- Hr Studies
4 I. 26 & 212 Deep Cores / Bed Sediment & Hg Mobiliza=on 26 Collabora=on with SFEI & UC Berkeley Collect 15 deep (2 meter cores) in Alviso Sl. Main channel and fringing Marsh QuanYfy Hg species & potenyal mobilizayon Based on 2 \. & 4 \. A8- Notch scenario 212 Collabora=on with B. Jaffe (USGS) Collect 4 addiyonal deep (2 meter cores) in Alviso Sl. Main channel only Combine with 26 data Use bathymetry models to quanyfy sediment & Hg mobilizayon since A8- Notch opening Compare to original predicyons
5 USGS & SFEI: 26 Deep Cores Total Mercury in Alviso Slough: 1,65 kg T5 THg (µg/cm 3 ) T4- B D T4 T3 c Sediment Mobilized (1 x m 3 ) T2 D C B A PWA Sediment Scour Model 2' Notch 4' Notch 5 Depth (cm) g/m 2 Mercury Mobilized Scenario THg 2 f. Notch 66 kg 4 f. Notch 125 kg B T1 A Proposed A8 notch loca=on Source: Marvin-DiPasquale and Cox, 27, USGS Open-File Report
6 USGS: 212 Deep Cores HgT (ng/gdw) HgT (ng/gdw) Sediment Depth (cm) Core 4A Core 4B Core 4C May 12, #4 Sediment Depth (cm) Core 3AL Core 3B Core 3C May 12, #3 2 HgT (ng/gdw) Sediment Depth (cm) HgT (ng/gdw) Core 1A Sediment Depth (cm) 5 1 ) 15 Core 2A Core 2B 2 May 12, #1 May 12, #2 2
7 USGS Bathymetric Surveys (B. Jaffe, A. Foxgrover, T. Fregoso) Bathy Surveys Restoration Actions
8 I. 26 & 212 Deep Cores / Bed Sediment & Hg Mobiliza=on A A3N h X Pond A6 h A6 # AC512-4 h h AC512-3 # AS-T5B (2 cm)! X A5 Maximum A9 erosion zone A1 A7 A4 AS-T4B (2 cm)! A3W Less Hg mobilized than predicted But Pond A8 has only opened 15 A14 (5 15 f. Notch A13 opening) A11 AS-T3B (2 cm)! AS-T2B (2 cm)! Most has eroded near Pond A6 breach Mercury Mobilized A8N Pond A8 A8S A12 A15 AS-T1B (2 cm)! Scenario DEC.21 thru OCT.212 Bathymetry model ") AC512-2 # AC512-1 # THg (kg) Es=mate - 2 f. Notch Es=mate - 4 f. Notch
9 A8 Notch Construc=on II. Pond A8 Notch Opening / Biosen=nal Toolbox USGS & UC- Davis collabora=on Document changes in Hg: Sediment and water BiosenYnel fish Bird eggs Where: Pond A5/A7/A8 Complex Alviso Slough REFERENCE Ponds and Slough When: 21 (Pre- Notch Opening) 211 (Post- Notch Opening) [JUNE 1, 211; 5 \] A8 Notch Opening
10 Previous USGS & SFEI Study [27-28] SEDIMENT MeHg UNFILTERED SURFACE WATER MeHg 1 MeHg (ng/g dry wt.) 1 1 POND A8 [1] [1] [1] [24] [17] MeHg (ng/l) 1.1 POND A8 A8 mudflat A8 slough Alviso slough Alviso marsh Ref marsh Pond A8 Alviso Slough Alviso Marsh Pond A8 very contaminated w/ MeHg (sediment & water) Predicted: this would improve if Ydal flushing was restored Grenier et al., 21, South Baylands Mercury Project - Final Report to the California State Coastal Conservancy, February 1, 21, 97 p. [online at SFEI website]
11 1. km Coyote Creek ALSL Sampling April: water (only) May, June/July & August: water & sediment A3N (control) A5 A7 ALSL- 3 A5 /A7 /A8 Internal Levees Breached APRIL 211 A16 (control) MASL (control) Sloughs Ponds A8 ALSL- 2 A8 Notch Opened 5 f on JUNE 1 st, 211 ALSL- 1
12 log k d [THg] (L/kg) THg Par==oning vs Salinity (21 [PRE- BRACH] only) R² = log[specific Conduc=vity] (µs/cm) Hg binding to parycles is controlled by salinity, DOC & parycle composiyon Has direct implicayons on Hg accumulayon into biota II. Pond A8 Notch Opening / Biosen=nal Toolbox Higher k d = par==oning towards par=cles Lower k d = par==oning towards dissolved phase Sloughs Control Ponds Pond A8 log k d [MeHg] (L/kg) MeHg Par==oning vs Salinity (21 [PRE- BRACH] only) R² = log[specific Conduc=vity] (µs/cm)
13 Changing Surface Water Chemistry (21 to 211) Specific Conduc=vity (µs/cm) 2, 16, 12, 8, 4, Salinity Decrease in A5/A7/A8 Complex DOC (mg/l) DOC Decrease in A5/ A7/A8 Complex TSS (mg/l) 1,4 1,2 1, complex REF.Pond up.alsl low.alsl REF.SL TSS Decrease in A5/ A7/A8 Complex ALSO: δ 13 C- POC Decrease in A5/A7/A8 Complex POC/PN Ra=o complex REF.Pond up.alsl low.alsl REF.SL P=.61 POC/PN Ra=o Increase in A5/A7/A8 Complex 2 complex REF.Pond up.alsl low.alsl REF.SL 6 complex REF.Pond up.alsl low.alsl REF.SL
14 Surface Water Hg Par==oning vs Salinity (21 & 211) LOG1 [kd.thg] A) k d [THg] vs Salinity R p = LOG1 [Specific Conductivity] complex REF.Pond up.alsl low.alsl REF.SL Significant shi\ in THg & MeHg paryyoning towards parycles from 21 to 211 (A5/A7/A8 Complex) Due to decreased salinity & DOC, and changing parycle character B) k d [MeHg] vs Salinity complex REF.Pond up.alsl low.alsl REF.SL LOG1 [kd.mehg] R p = LOG1 [Specific Conductivity]
15 II. Pond A8 Notch Opening / Biosen=nal Toolbox [21 211] DIFF [K d MeHg] (L/kg) -1, -2, SLOUGH Surface water MeHg par==oning coefficients REF.SL low.alsl up.alsl 21 to 211 DECREASE in kd[mehg] in up.alsl (near Pond A8 Notch), compared to low.alsl and REF.SL Shi\ towards dissolved phase Linked to high Salinity & DOC efflux from the A5/A7/A8 Complex? -3. April May June Aug
16 Threespine S=ckleback Longjaw Mudsucker II. Pond A8 Notch Opening / Biosen=nal Toolbox A5/A7/A8 Complex Fish [Hg] decreased a\er opening of Pond A8 Notch (June 1, 211) Coincident with an increase in THg and MeHg paryyoning onto parycles SuggesYng less bioavailable Hg Alviso Slough Fish [Hg] increased during 211 (peak in July) relayve to 21 and Mallard Slough Coincident with a decrease in MeHg paryyoning (off of parycles) in upper Alviso Slough SuggesYng more bioavailable Hg Threespine S=ckleback Mississippi Silverside
17 III. Water Column Hg Flux / 24- Hr Diel Studies Collabora=on with USGS CA- Water Sciece Center, Sacramento, CA (G. Shellenbarger & D. Schoellhamer) Collect hourly surface water samples for Hg species over a full diel 24- hr cycle (two Ydes) Co- locate sampling with USGS conynuous monitoring stayon (mid- Alviso Slough) Seasonal (spring, summer, winter, fall), PLUS the 1 st big flush event Develop [Hg] & SSC relayonships Use conynuous monitoring & SSC mass flux data to integrate 24- hr results over longer Yme frames.
18 III. Water Column Hg Flux / 24- Hr Diel Studies 1. km A6 A5 Bayward A7 A8 Con=nuous monitoring buoy Collabora=on with USGS CA- Water Sciece Center, Sacramento, CA (G. Shellenbarger & D. Schoellhamer) Collect hourly surface H2O samples for Hg species over a full diel 24- hr cycle (two Ydes) Co- locate sampling with USGS conynuous monitoring stayon (mid- Alviso Slough) Net Sediment & Hg flux?? Slough cross sec=on Landward Seasonal (spring, summer, winter, fall), PLUS the 1 st big flush event Develop [Hg] & TSS relayonships Use conynuous monitoring & SSC mass flux data to integrate 24- hr results over longer Yme frames.
19 p- THg (ng/l) III. Water Column Hg Flux / 24- Hr Diel Studies Par=culate THg (ng/l) Also data for Dissolved THg Dissolved & ParYculate MeHg TSS, Chl- a, Salinity, temperature, Dissolve O 2 Carbon & Nitrogen (w/ isotopes) Tide Rela=ve to MLLW (m) p- THg (ng/g) dry wt Data for May 7-8, 212 Par=culate THg (ng/g) dry wt Tide Rela=ve to MLLW (m)
20 III. Water Column Hg Flux / 24- Hr Diel Studies 35 May 7-8, 212 par=culate THg (ng/l) y =.4x R² = Suspended Sediment (mg/l) The SSC vs p.thg rela=onship is established for each sampling event The con=nuous (high resolu=on) SSC data is then used to calculate p.thg flux
21 SSC (metric TONS / [15 min]) III. Water Column Hg Flux / 24- Hr Diel Studies Suspended Sediment Flux / May 7-8, May :3 8- May- 12 2:3 8- May :3 Bayward Landward Ini=al Flux Calcula=ons TONS of suspended sediment moving up/down Alviso Slough daily Net sediment & Hg flux can be either landward or bayward depending on season and Yde THg flux 1 s g/day Sampling Period Sediment (TONS / day) Total Hg (g / day) May 7-8, (landward) (landward) Nov. 1-2, (bayward) 1.3 (bayward) Dec. 1-2, (bayward) -.3 (landward)
22 Mercury in Mo=on 3 Short Stories / TAKE HOME Western U.S. (California) I. 26 & 212 Deep Cores / Bed Sediment & Hg Mobiliza=on Less Hg mobilized than originally predicted But Pond A8 has only opened 15 (out of 4 max) Most has eroded near Pond A6 breach II. Pond A8 Notch Opening / Biosen=nal Toolbox The opening of A8 notch affected the par==oning of THg and MeHg on/off par=cles in the Complex and Upper Alviso Slough This affected Hg availability into biota III. Water Column Hg Flux / 24- Hr Studies TONS of suspended sediment moving up/down Alviso Slough daily Daily Net sediment flux can be either landward or bayward THg flux 1 s g/day
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