Posts Tagged ‘ hypoxia ’

Input sought on Long Island Sound management plan

Sep 17th, 2014 | By

A new management and conservation plan for Long Island Sound identifies six problem areas that should be addressed by governmental agencies and environmental and university groups.

Nitrogen Pollution in Long Island Sound Continues to Decline

Jul 16th, 2014 | By
Muddy sediment empties into Long Island Sound from the Connecticut River after Hurricane Irene in 2011. (NASA Earth Observatory)

A new report says nitrogen pollution discharged into Long Island Sound continues an overall decline. That’s good news for marine life because too much nitrogen can fuel the growth of algae, which dies, settles on the ocean floor, and decays, using up oxygen in the process.

Area of low oxygen in Sound smaller this year than last

Aug 28th, 2013 | By

The area of seasonal hypoxia, or depleted oxygen, in Long Island Sound this summer appears to be significantly smaller than last year, but it’s too early — and there are too many year-by-year fluctuations — to call it a trend, Sound-watchers say. For more on this story, visit: Area of low oxygen in Sound smaller

[continue reading…]

Low oxygen levels present even in bays in eastern estuary, UConn researchers find

Aug 5th, 2013 | By

Even in the cleaner eastern end of Long Island Sound, oxygen levels in the most inland reaches of some coves and bays drops to suffocatingly low levels virtually every night in late summer, only to rebound when the sun comes up in the morning, University of Connecticut researchers have found.

Wastewater Treatment Plants and Water Quality

Mar 29th, 2013 | By

At present, Connecticut and New York wastewater treatment facilities have done an excellent job in working to meet or beat their permitted nitrogen discharge targets, and we are on pace to meet, or at least get pretty close to the original goal of a 58 percent reduction in nitrogen loading from this source by 2014. However, sewage is not the only source of nitrogen into Long Island Sound, so this reduction represents a significantly smaller percentage of the overall amount of nitrogen entering the Sound from all sources.

Tom Andersen Delivers The Good, the Bad, the Expensive News on LIS

Mar 19th, 2013 | By

Andersen provided a very graphic and depressing picture of the Sound’s condition back in the summer of 1987, when the waters were so low in oxygen and so high in hydrogen sulfide that lobsters and fish were actually crawling or flipping out of the water in desperation. Scuba divers trying to survey the extent of

[continue reading…]

The Science of Hypoxia, by Johan Varekamp

Oct 4th, 2012 | By

The oxygen consumption rate in the deeper waters is modulated by the abundance of “rotting” organic material, the debris of locally produced algae (mainly diatoms in the Sound) and the influx of solid organic material from land (leaves, grass) as well as solid carbon debris from waste water treatment facilities. The oxidation of this organic material consumes dissolved O2 until it is fully depleted in the water, and other pathways of organic carbon mineralization then take over.

August saw extreme low oxygen in Western Long Island Sound

Oct 1st, 2012 | By

Water quality testing conducted by the Connecticut Department of Energy and Environmental Protection showed that dissolved oxygen concentrations in 18 square miles of the Sound, between New Rochelle and Larchmont in Westchester and Sands Point and Glen Cove in Nassau, were between 3.5 and 4.79 milligrams per liter.

Sound oxygen levels called ‘poor’

Aug 17th, 2010 | By

STAMFORD — Environmental researchers say high temperatures and little wind have combined to produce poor oxygen levels in Long Island Sound this summer. Peter Sattler, principal environmental planner for the Interstate Environmental Commission, said the agency has found “poor” dissolved oxygen in six of seven weeks of water monitoring since late June. via Sound oxygen

[continue reading…]