Polusi akibat tumpahan minyak di laut www life

Polusi akibat tumpahan minyak di laut www. life. illinois. edu

Exxon Valdez • March 24, 1989 • 10. 8 gallons (1 gallon sekitar 3, 7 liter) • 1100 miles of Alaskan coast • Valdez was carrying 53 million gallons • Impact on environment

Nowruz Oil Field Spill • February 10 - Semptember 18 1983 • Persian Gulf, Iran • 80 million gallons

Kolva River • September 8, 1994 • Kolva River, Russia • Pipeline • 84 million gallons

Atlantic Empress • July 19, 1979 • Off of Trinidad and Tobago • 90 million gallons

Ixtoc 1 • June 3, 1979 - March 23, 1980 • Bay of Campeche, Mexico • 140 million gallons

1 st Gulf War • January 19, 1991 • Persian Gulf, Kuwait • 380 -520 million gallons

Deep Water Horizon • • April 20 – July 15, 2010 Gulf of Mexico, Louisiana 205. 8 million gallons Effectively dead September 19, 2010

Dead Zone http: //ecowatch. ncddc. noaa. gov/hypoxia/products

Dead Zone http: //serc. carleton. edu/microbelife/topics/deadzone/ http: //www. mygeoinfo. com/2010/05/13/map-of-location-of-the-bp-oil-spill-and-deepwater-horizon/

Dead Zone • Found worldwide, Gulf’s is one of the largest • Hypoxic conditions occur because of runoff from farms in waters of the Mississippi-- promotes algal growth • Leads to depletion of dissolved oxygen in water (kekurangan oksigen dalam air) • Linked to fish kills in Gulf http: //serc. carleton. edu/microbelife/topics/deadzone/

If Containment Fails…. • Formation of the Gulf Stream • Entrance: Yucatan Strait • Produces ‘Loop Current’ • Exits: Florida Strait forming the Gulf Stream • With the Gulf: Loop generates eddies

Containment Failure: the Global Scale • “Conveyor Belt” • Oil possibly limiting Gulf from receiving hot water from E. currents • Lowers ability to warm N. hemisphere • Eventually stop all currents? ? ?

Thus far…. • Zone temperature changes • Domino effect of continental climate change

Tumpahan minyak akan memperburuk kualitas air dan kehidupan biota

Water quality: Dissolved Oxygen • Low dissolved oxygen (DO 2) levels have been detected in contaminated areas • DO 2 depression have been observed more than 80 km from the well head • DO 2 depression likely due to increased biochemical oxygen demand to metabolize oil hydrocarbons • DO 2 levels have not approached hypoxic levels • DO 2 depression does not seem to be worsening due to mixing of high and low DO 2 waters

Water quality: Chemical levels • Above normal oil and chemical levels have been observed in waters and sediments many miles from well head • No samples exceeded the EPA’s human health or dispersants benchmarks • About 1% of samples exceeded aquatic life benchmark

Effects on Wildlife

Effects on Wildlife: Birds • Seabirds can dive into oil slicks thinking they are calm water • Oil makes birds unable to regulate body temperature • Leads to hyperthermia

Marine Mammals • Whales and dolphins can come up to breath in oil slicks • Can cause respiratory problems or suffocation • Dolphins have been known to follow clean up ships into slicks

Fish/Crustaceans/Mollusks • Adult fish, shrimp, crabs, and oysters metabolize oil hydrocarbons (at different rates) • Real threat is to shore line nursery areas • Contamination can lead to death of future generations

http: //www. nytimes. com/interactive/2010/04 /28/us/20100428 -spill-map. html

Food Concerns • Many people are suspicious of seafood from the Gulf • Tests show there is little hazard from oil in seafood • Animals metabolize hydrocarbons and remove them from their systems

Hesco units Seven hours to build 1500 sandbag equivalent

Absorbent & Containment Booms

Oil Skimming boats don’t pick up 100% oil can harm environment themselves • • • http: //news. discovery. com/tech/how-do-oil-skimmers-work. html http: //earthquakes-today. info/2010/08/oil-spill-clean-up-methods-saving-gulf-coast-beaches/ http: //www. nola. com/news/gulf-oil-spill/index. ssf/2010/07/giant_oil_skimmer_a_whale_deem. html

Membersihkan minyak dengan • Cara fisik (minyak langsung diambil) • Cara kimia (dispersant) • Cara biologi (mengaktifkan bakteri pemakan minyak)

Membersihkan minyak dengan OIL DISPERSANTS

Dispersant Use • Breaks up oil before it reaches the beaches and marshes on land • 1. 8 million gallons were used on the surface and at source of oil leakage – more than has ever been used by the US before • Dispersing the oil causes many marine animals to be subject to oil that would not have been without using dispersants, which have unknown effects

How Dispersant Works o Sprayed on surface of water, breaks oil down into tiny suspended droplets, over time broken down by oil-eating bacteria, sunlight, and wave action and dispersed throughout the ocean or sinks to the bottom o Toxic to marine animals that live/spawn/reproduce there, trades one ecosystem for another

Dispersant: campuran solvent (pelarut), surfactant dan senyawa tambahan lain): Melarutkan minyak dalam air, gelombang membantu memisahkan senyawa 2 minyak, senyawa 2 minyak terpisah (memudahkan bakteri memakannya)

Dispersal of Dispersants • Most sprayed from airplanes, however in this specific instance was injected at the well’s leaking riser a mile below the surface, effects of which had previously never been tested • No idea how oil, dispersants, and bacteria will react under such high pressure, low temps and O 2, and no light • If oil not degraded by bacteria, could linger for decades on bottom of ocean floor or carried to deep sea coral reefs

Estimated Cost of Cleanup • Former BP CEO Tony • By November, BP said it had Hayward initially stated that sent $1. 7 billion in checks. BP would take full economic • Estimates state that about responsibility for all of those $6 billion of the fund will be affected. paid out in claims, including • On June 16, after meeting government aims and with President Obama, BP cleanup costs. Feinberg executives agreed to create plans to return the a $20 billion spill response remaining $14 billion to BP fund once all the settlements are paid out by August 2013. [ • Attorney Kenneth Feinberg is in charge of this escrow account.

Companies Negatively Impacted • Fishing in Louisiana alone supplies roughly 40% of US seafood. • Approximately 36% of Gulf federal waters were closed off during the clean-up processes. • The Deepwater Horizon oil spill is estimated to cost the industry $2. 4 billion. • Tourism in Florida is another industry that has been largely affected. • The region’s tourism industry is expected to be impacted for an additional 2. 5 years and suffer a total loss of $22. 7 billion.

Companies Positively Impacted • Clean Harbors, a company dedicated to coastal restoration, was employed to help in clean-up efforts. • They saw an increase in market shares of at least 12%. • Nalco Holdings has benefited greatly from the oil spill. • Production of Corexit has caused shares to increase dramatically, even as much as 6% in one day.

Price Jumps/Supply and Demand • There are 195 seafood • Seafood supply is down processors across the because fishermen who Gulf Coast employing normally bring in the more than 9, 000 crabs, shrimp and fish workers and generating have been employed more than $1 billion in with BP cleaning up the revenue a year. spill or have not been able to return to their fisheries because of the oil.

Price Jumps/Supply and Demand • At the same time, • This is a classic supply demand is down chain problem that is because their longtime caused by tainted customers, such as resources and a tainted restaurants and grocery reputation of where the chains, have turned to product is coming from. other sources or are skittish to buy Gulf seafood. • http: //www. usatoday. com/news/nation/environment/2010 -10 -08 oilspill 08_ST_N. htm