1 / 16

Nutrients & Dissolved Oxygen

Nutrients & Dissolved Oxygen. Jonathan Pennock University of New Hampshire Marine Program, NH Sea Grant & Jackson Estuarine Laboratory. Eutrophication Positive Versus Negative Effects. Oligotrophic Mesotrophic Eutrophic Dystrophic Phytoplankton Zooplankton Pelagic Fish Bottom Oxygen

osman
Download Presentation

Nutrients & Dissolved Oxygen

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Nutrients & Dissolved Oxygen Jonathan Pennock University of New Hampshire Marine Program, NH Sea Grant & Jackson Estuarine Laboratory

  2. EutrophicationPositive Versus Negative Effects Oligotrophic Mesotrophic Eutrophic Dystrophic Phytoplankton Zooplankton Pelagic Fish Bottom Oxygen Benthos Benthic Fish

  3. NOAA Estuarine Eutrophication Assessment Bricker 1999

  4. Environmental Protection Agency

  5. Nitrogen in Great Bay • Q Have nitrogen concentrations in Great Bay changed significantly over time? Yes. The total nitrogen load to the Great Bay Estuary increased by 42% in the past 5 years. Dissolved inorganic nitrogen concentrations have increased in Great Bay by 44% in the past 28 years. • A

  6. Total N Load 2002-2004 1,097 tons/yr 2006-2008 1,558 tons/yr Percent Change 42% Nitrogen Loads to Great Bay WWTFs 484.64 tons/yr 31% Groundwater 31.28 tons/yr 2% Tributaries and Runoff 1014.00 tons/yr 65% Atmospheric 27.92 tons/yr 2% • Data Source: PREP

  7. Dissolved Nitrogen Dissolved Inorganic Nitrogen 44% increase over 28 years Ru Morrison

  8. Chlorophyll-a & Suspended Solids Chlorophyll-a 28% increase over 28 years Suspended Solids 123% increase over 28 years

  9. Chlorophyll Concentration

  10. Dissolved Oxygen How often do dissolved oxygen levels in the estuary fall below state standards? Rarely in the bays and harbors but often in the tidal rivers. • Q • A

  11. Oxygen Depletion at Datasondes

  12. Dissolved Oxygen Concentration

  13. Dissolved Oxygen Concentration Ru Morrison

  14. Dissolved Oxygen Diel Variability Phil Trowbridge

  15. Data Gaps • Additional Sampling Stations in the Bay are Needed to Provide Better Insight and Averages for the Bay Proper… • A Robust Nutrient Loading/Sink Model is Needed to Determine Specific Nutrient Loading and Ultimate Fate of Nutrients in the System… • There are No Data on Phytoplankton Production in the Estuary… • …

  16. Thank You!

More Related