Chromophoric Dissolved Organic Matter CDOM in the Hudson River Estuary and Plume

1
Chromophoric Dissolved Organic Matter (CDOM) in
the Hudson River Estuary and Plume

• Robert F. Chen, G. Bernard Gardner, Steven M.
  Rudnick, Francesco Peri, Liannea Litz, Zhen Wang,
  Huang Wei

2
The Integrated Coastal Observation System (ICOS)

• ECOShuttle
• Entire Hudson Estuary investigation about 24
  hours-4 deployments
• June, 2003
• May, June, Sept., 2004
• Pumping System
• Adaptive or Continuous Sampling
• TOC
• Nutrients

3
Bad News, Good News

• Did everything work as planned?
• Needs Improvement
• CDOM fluorometer (SeaTech) had interference from
  dye
• Dye was injected over 0.5 PSU salinity range
• AC-9 and LISST-100
• Successes
• EcoShuttle flew and gathered data, dye
  fluorometer
• Discrete Samples (TOC, TN, nutrients)
• Surface Mapper CDOM measurements
• River studies reveal sources

4
CDOM Fluorescence vs. Salinity
SeaTech (ECOShuttle)
SeaPoint (Surface Mapper)
5
Surface Mapper
6
(No Transcript)
7
TOC, TN, Salinity
8
Total Organic Carbon
9
Total Nitrogen
10
Hudson River EstuaryJune, 2004
Raritan
Hudson
Schmutz?
11
Hudson Transect, September, 2004
12
Tidal Studies--Ebb
13
Tidal Studies--Flood
14
(No Transcript)
15
Kill van Kull
16
Rhodamine in the Raritan?
17
What Do We Want To Learn?

• Sources and Sinks of CDOM/DOM
• Biological Production
• Photodegradation
• Flocculation
• Coastal Sources
• Pollution

18
Release Dye
19
Assumptions

• Hudson endmember dominates plume
• Hudson endmember constant
• Dye gives time of some fraction of the measured
  plume water
• If CDOM endmember changes over timescales of the
  dye tracking, you cannot determine sources or
  sinks
• If CDOM shows source or sink, you cannot
  determine rates (X from T0, Y from T?)

20
Dye Gives T0 Plume Water
Dye
If Dye is 50 of expected, CDOM is 50 from T0,
50 from other plume
CDOM
Plume Endmember
Concentration
Marine Endmember
Salinity
21
(No Transcript)
22
Plume MappingSurface Salinity Distribution
23
Winds from the Southwest
24
Estuarine MappingNon-Conservative Mixing
25
Chromophoric Dissolved Organic Matter
26
Uncontaminated Seawater Pumping System

• All teflon and stainless steel
• 8 l/min flow rate, samples after 3 min delay

27
Discrete Samples
28
Laser-Induced Fluorescence System (Pyrene)
29
Pyrene (ng/l)
June, 2004

• gt1300 pyrene measurements in 5 days
• Maximum downstream of Manhattan

30
Summary

• Mid-Estuary source of CDOM
• Export is higher than Hudson can supply
• Pyrene, caffeine, nutrients, trace metals,
  bacterial indicators being examined in Kill van
  Kull
• ICOS can track sources
• Low salinity flocculation
• Plume is variable, but trackable

31
Winds from the Northeast