1 / 8

HYPOXIA

HYPOXIA. A condition where the water becomes so low in dissolved oxygen content (<2mg/L) that most higher forms of life can not survive. Caused by poor mixing within the water column and / or decomposition of organic matter. HYPOXIA. There are natural hypoxic regions

azizi
Download Presentation

HYPOXIA

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. HYPOXIA • A condition where the water becomes so low in dissolved oxygen content (<2mg/L) that most higher forms of life can not survive. • Caused by poor mixing within the water column and / or decomposition of organic matter. Hypoxia

  2. Hypoxia

  3. HYPOXIA • There are natural hypoxic regions • Western coasts of continents • Fjords • center of the Black Sea • In ocean waters the most limiting nutrient is nitrogen. Hypoxia

  4. WORLD HYPOXIC ZONES Hypoxia

  5. HYPOXIA • The worst hypoxic conditions are in the Baltic Sea and the Black Sea • Hypoxic conditions have been increasing since the 1960’s • The Gulf of Mexico, outside the delta of the Mississippi River is the worlds third largest hypoxic area • 12400 sq. km. (4800 sq. mi) Hypoxia

  6. GULF OF MEXICO HYPOXIA • Nitrogen export from the Mississippi River has increased 2- to 7-fold over the last century • Nitrogen losses from ag-land in the basin are by air, surface runoff, sediment transport and subsurface drainage. • Losses of about 1.8 million Mg / yr Hypoxia

  7. NITROGEN LOSSES FROM FARMS IN THE MISSISSIPPI BASIN Hypoxia

  8. Estimated NO3 Export from IA Hypoxia

More Related