POSSIBILITY FOR RECORD BREAKING DEAD
ZONE IN THE GULF THIS YEAR!
GROWING DEAD ZONES CHOKE THE LIFE OUT OF COASTAL WATERS WORLDWIDE
SUMMER 2009 UPDATE
When CatMap first reported on Dead Zones in 2006, scientists estimated there were about 100 DZs of various sizes scattered around the coastal waters of the planet. Fast forward to summer of 2009 and the number has now grown to something over four hundred. They’re hard to pinpoint sometimes, because dead zones are the essence of nothing. There is no oxygen in the water, and nothing lives there.
This year it appears that one of the biggest and deadest of the dead zones - right off the shores of Louisiana in the Gulf of Mexico – is on track to be one of the largest on record in 2009. The latest forecast, issued by University of Michigan aquatic ecologist Donald Scavia, predicts a dead zone of between 7,450 and 8,456 square miles. That would make three years of this decade worthy of placing in the top five Gulf dead zones of all time. The area of New Jersey is 7417 sq. miles.
When CatMap first reported on Dead Zones in 2006, scientists estimated there were about 100 DZs of various sizes scattered around the coastal waters of the planet. Fast forward to summer of 2009 and the number has now grown to something over four hundred. They’re hard to pinpoint sometimes, because dead zones are the essence of nothing. There is no oxygen in the water, and nothing lives there.
This year it appears that one of the biggest and deadest of the dead zones - right off the shores of Louisiana in the Gulf of Mexico – is on track to be one of the largest on record in 2009. The latest forecast, issued by University of Michigan aquatic ecologist Donald Scavia, predicts a dead zone of between 7,450 and 8,456 square miles. That would make three years of this decade worthy of placing in the top five Gulf dead zones of all time. The area of New Jersey is 7417 sq. miles.
WHAT IS A DEAD ZONE?
A Dead Zone is an area of water with a Hypoxic bottom, which is to say, a lifeless, oxygen-starved place where nothing can live. When we say "area", we don't mean an small anomaly, but rather something measured in square miles. The Dead Zone in the Gulf of Mexico sometimes reaches an area the size of New Jerey.
Dead Zones are caused by the large scale run-off of phosphate fertilizers, sewage, animal wastes and pollutions from the burning of fossil fuels into oceans, gulfs and other bodies of water. The algal blooms that cause dead zones are triggered by nutrients from this runoff. The low levels of oxygen in the water make it impossible for fish, oysters and other marine creatures to survive. These hypoxic conditions also kill off sea grass beds, which serve as habitats for marine life.
The massive algae blooms die and sink to the bottom, where it is consumed by microbes, which consume oxygen in the process. More algae means more oxygen-burning, and thereby less oxygen in the water, resulting in a massive flight by those fish, crustaceans and other ocean-dwellers able to relocate as well as the mass death of immobile creatures, such as clams or other bottom-dwellers. And that's when the microbes that thrive in oxygen-free environments take over, forming vast bacterial mats that produce hydrogen sulfide, a toxic gas.
In the Gulf of Mexico dead zone, for example, agricultural runoff from the farmlands of central U.S, travel down the Mississippi. The phenomenon was first noted in the 1970's, about the time that monocultural agriculture began on a massive scale. A single low-oxygen event (known scientifically as hypoxia) off the coasts of New York State and New Jersey in 1976 covering a mere 385 square miles (1,000 square kilometers) of seabed ended up costing commercial and recreational fisheries in the region more than $500 million. As it stands, roughly 83,000 tons (75,000 metric tons) of fish and other ocean life are lost to the Chesapeake Bay dead zone each year—enough to feed half the commercial crab catch for a year.
Since then, the number of dead zones in the world's oceans and seas has increased dramatically, endangering fish stocks and the people who depend on them for food and livelihoods, the United Nations Environment Program (UNEP) warned Thursday. The latest study finds at least 435 dead zones across the world, up dramatically from previous years.
This is no small economic matter. Some of the earliest recorded dead zones were in places like Chesapeake Bay in the United States, the Baltic Sea, the Kattegat, the Black Sea and the northern Adriatic Sea. The most well-known area of depleted oxygen is in the Gulf of Mexico - directly linked to nutrients or fertilizers brought to the Gulf by the Mississippi River. The report identifies new dead zones in the Finland's Archipelago Sea, the Fosu Lagoon in Ghana, the Mersey Estuary in the United Kingdom and Uruguay's Montevideo Bay. Others have been appearing off South America, China, Japan, south-east Australia and New Zealand. The report warns that the pollution that contributes to dead zones shows few signs of decreasing. "There are numerous compelling reasons for combating pollution to the marine environment," said UNEP Executive Director Achim Steiner. "These range from public health concerns to the economic damage such pollution can cause to tourism and fisheries.
A Dead Zone is an area of water with a Hypoxic bottom, which is to say, a lifeless, oxygen-starved place where nothing can live. When we say "area", we don't mean an small anomaly, but rather something measured in square miles. The Dead Zone in the Gulf of Mexico sometimes reaches an area the size of New Jerey.
Dead Zones are caused by the large scale run-off of phosphate fertilizers, sewage, animal wastes and pollutions from the burning of fossil fuels into oceans, gulfs and other bodies of water. The algal blooms that cause dead zones are triggered by nutrients from this runoff. The low levels of oxygen in the water make it impossible for fish, oysters and other marine creatures to survive. These hypoxic conditions also kill off sea grass beds, which serve as habitats for marine life.The massive algae blooms die and sink to the bottom, where it is consumed by microbes, which consume oxygen in the process. More algae means more oxygen-burning, and thereby less oxygen in the water, resulting in a massive flight by those fish, crustaceans and other ocean-dwellers able to relocate as well as the mass death of immobile creatures, such as clams or other bottom-dwellers. And that's when the microbes that thrive in oxygen-free environments take over, forming vast bacterial mats that produce hydrogen sulfide, a toxic gas.
In the Gulf of Mexico dead zone, for example, agricultural runoff from the farmlands of central U.S, travel down the Mississippi. The phenomenon was first noted in the 1970's, about the time that monocultural agriculture began on a massive scale. A single low-oxygen event (known scientifically as hypoxia) off the coasts of New York State and New Jersey in 1976 covering a mere 385 square miles (1,000 square kilometers) of seabed ended up costing commercial and recreational fisheries in the region more than $500 million. As it stands, roughly 83,000 tons (75,000 metric tons) of fish and other ocean life are lost to the Chesapeake Bay dead zone each year—enough to feed half the commercial crab catch for a year.
Since then, the number of dead zones in the world's oceans and seas has increased dramatically, endangering fish stocks and the people who depend on them for food and livelihoods, the United Nations Environment Program (UNEP) warned Thursday. The latest study finds at least 435 dead zones across the world, up dramatically from previous years.
This is no small economic matter. Some of the earliest recorded dead zones were in places like Chesapeake Bay in the United States, the Baltic Sea, the Kattegat, the Black Sea and the northern Adriatic Sea. The most well-known area of depleted oxygen is in the Gulf of Mexico - directly linked to nutrients or fertilizers brought to the Gulf by the Mississippi River. The report identifies new dead zones in the Finland's Archipelago Sea, the Fosu Lagoon in Ghana, the Mersey Estuary in the United Kingdom and Uruguay's Montevideo Bay. Others have been appearing off South America, China, Japan, south-east Australia and New Zealand. The report warns that the pollution that contributes to dead zones shows few signs of decreasing. "There are numerous compelling reasons for combating pollution to the marine environment," said UNEP Executive Director Achim Steiner. "These range from public health concerns to the economic damage such pollution can cause to tourism and fisheries.
FUTURE OF DEAD ZONES
Here in the summer of 2009, the number of Dead Zones continues to increase around the world, pretty much at the same rate as massive, unsustainable agribusiness.
There are over 405 official dead zones around the world, not the least among them those dotting nearly the entire east and south coasts of the United States. Western rivers within agricultural or urban areas also sport dead zones at their mouths. In the Baltic Sea, the world's largest dead zone now features a bottom area which lacks oxygen year-round.
Nitrogen exports to the marine environment from rivers, for example, are expected to rise globally by 14 per cent by 2030 when compared with the mid 1990s.
However, Dead Zones are able to come back to life once fertilizer and other pollution is no longer dumped into them. It's amazing really. For example, in what amounts to a real life laboratory demonstration, Black Sea dead zone, previously the largest dead zone in the world, largely disappeared between 1991 and 2001 after fertilizers became too costly to use following the collapse of the Soviet Union and the demise of centrally planned economies in Eastern and Central Europe. This also made room for the Gulf of Mexico Dead Zone to become numero uno.
Similarly, from 1985 to 2000, the North Sea dead zone had nitrogen reduced by 37% when policy efforts by countries on the Rhine River reduced sewage and industrial emissions of nitrogen into the water.
Return to the water map
More fun with dead zones.
Here in the summer of 2009, the number of Dead Zones continues to increase around the world, pretty much at the same rate as massive, unsustainable agribusiness.
There are over 405 official dead zones around the world, not the least among them those dotting nearly the entire east and south coasts of the United States. Western rivers within agricultural or urban areas also sport dead zones at their mouths. In the Baltic Sea, the world's largest dead zone now features a bottom area which lacks oxygen year-round.
Nitrogen exports to the marine environment from rivers, for example, are expected to rise globally by 14 per cent by 2030 when compared with the mid 1990s.
However, Dead Zones are able to come back to life once fertilizer and other pollution is no longer dumped into them. It's amazing really. For example, in what amounts to a real life laboratory demonstration, Black Sea dead zone, previously the largest dead zone in the world, largely disappeared between 1991 and 2001 after fertilizers became too costly to use following the collapse of the Soviet Union and the demise of centrally planned economies in Eastern and Central Europe. This also made room for the Gulf of Mexico Dead Zone to become numero uno.
Similarly, from 1985 to 2000, the North Sea dead zone had nitrogen reduced by 37% when policy efforts by countries on the Rhine River reduced sewage and industrial emissions of nitrogen into the water.
Return to the water map
More fun with dead zones.