Ocean Dead Zones: How Pollution Is Creating Marine Deserts?
2024年11月24日 · Ocean dead zones are regions that cannot supply sufficient oxygen for their aquatic inhabitants. Otherwise referred to as hypoxia , this typically occurs in coastal waters as a result of excessive nutrient pollution .
Photochemical degradation of Corexit components in ocean water
2014年9月1日 · The purpose of this study was to determine the potential for the degradation of Corexit through sensitized photolysis in ocean water samples. This potential for HO sensitized photolysis was examined for five compounds in the Corexit mixture, including DOSS, DGBE, Tween 80, Tween 85 and Span 80 (structures shown in Table 1 ).
Ocean Dead Zones: What Are They and Can Dead Zones Recover?
Coastal dead zones can have a wide range of economic impacts. Low oxygen levels in the water can reduce the availability of commercially desirable species such as large shrimp, and result in lower fish catch. The harmful algal blooms that cause dead zones can make water unsafe for swimming and pollute coastal air, impacting tourism in those areas.
Corexit, oil and marine microgels - PubMed
2017年9月15日 · Corexit, an EPA-approved chemical dispersant, was intensively used during the 2010 Deepwater Horizon Oil Spill in the Gulf of Mexico. Current studies surrounding Corexit have mainly focused on its toxicity and oil removal capacity. The potential impact of Corexit on the surface ocean carbon dynamics …
Corexit, oil and marine microgels - ScienceDirect
2017年9月15日 · Corexit and oil can significantly impact marine microgel formation to warrant caution for Corexit use in future oil spills. Corexit, an EPA-approved chemical dispersant, was intensively used during the 2010 Deepwater Horizon Oil Spill in the Gulf of Mexico.
Dead zones in our oceans have increased dramatically since 1950
2018年1月18日 · Dead zones are areas of the ocean where oxygen has fallen to such low levels that most marine life cannot survive. A new study by a group at the UN’s Intergovernmental Oceanographic Commission reveals that far from being an isolated case, Chile’s toxic tides of 2016 may well be just the tip of the iceberg.
What is a dead zone? - NOAA's National Ocean Service
Hypoxic zones can occur naturally, but scientists are concerned about the areas created or enhanced by human activity. There are many physical, chemical, and biological factors that combine to create dead zones, but nutrient pollution is the primary cause of …
Dead zone (ecology) - Wikipedia
Dead zones are hypoxic (low- oxygen) areas in the world's oceans and large lakes. Hypoxia occurs when dissolved oxygen (DO) concentration falls to or below 2 ml of O 2 /liter. [2] . When a body of water experiences hypoxic conditions, aquatic flora and fauna begin to change behavior in order to reach sections of water with higher oxygen levels.
How can we stop the spread of ocean dead zones?
2015年4月9日 · Areas of extremely low oxygen, known as oxygen minimum zones or “dead zones”, are estimated to constitute 10% and rising of the world’s ocean. This expansion has been attributed to a warming climate, which increases water temperature, changes ocean circulation, and decreases the solubility of oxygen in sea water.
Photochemical degradation of Corexit components in ocean water
The direct photochemical degradation rates for two of the compounds, dioctyl sulfosuccinate (DOSS) and dipropylene glycol butyl ether (DGBE) were measured as 4.29×10(-6)s(-1) and 5.95×10(-6)s(-1), respectively; whereas the overall degradation rate in ocean water was 1.56×10(-5)s(-1) and 2.23×10(-5)s(-1).