Seuraa 
Viestejä45973
Liittynyt3.9.2015

Tulivuoren tuhkan on todettu ”lannoittavan” ympäristöään niin, että kasvillisuus hyötyy paljon siitä.
Nyt on saman havaittu tapahtuvan merialueilla, kun tutkittiin islantilaisen Eyjafjallajökull tulivuoren vuonna 2010 tapahtuneen tulivuorenpurkauksen vaikutuksia merellä.
Jotkut ilmastoaktivistit ovat ehdottaneet raudan käyttämistä valtamerien lannoittamiseksi. Tällä arvellaan voitavan vähentää hiilidioksidia ilmassa.
Tutkimukset varmasti jatkuvat, koska planktonin lisääntyminen lisää myös muuta elämää vesissä ja kalakantojen pitäisi myös lisääntyä.

http://www.icelandreview.com/icelandrev ... .news.aspx

Lainaus
Eyjafjallajökull Eruption Fueled Ocean Blooms
The plume of ash that spread from the eruption of volcano Eyjafjallajökull, South Iceland, in 2010 increased the iron concentrations at the ocean’s surface, which helps spur the growth of phytoplankton, a basis of the food chain, by about 20 to 45 percent.
Marine biogeochemist Eric Achterberg from the University of Southampton and his colleagues took part in research in the Iceland Basin region during and after the eruption, livescience.com reports.
According to Achterberg, it was the first time that scientists had been able to research the immediate effects of ash falling into the ocean.
At the same time, nitrate levels were almost depleted, suggesting that the higher amounts of phytoplankton consumed the nutrient.
Carbon dioxide uptake by phytoplankton was found to have increased by 10 to 20 percent, considered a blow to geoengineering schemes which aim to reduce CO2 by adding large amounts of iron to the world’s oceans.
Achterberg and his colleagues published their findings in the journal Geophysical Research Letters.

http://www.livescience.com/28105-icelan ... ocean.html

Lainaus
Iceland Volcano Eruption Fueled Ocean Blooms
Charles Q. Choi, OurAmazingPlanet Contributor
Date: 21 March 2013 Time: 04:43 PM ET
The explosive volcanic eruption Iceland saw in 2010 may have disrupted life in the air above Europe, but it apparently enriched life in the Atlantic Ocean, researchers say.
After nearly two centuries of dormancy, the volcano Eyjafjallajökull (AYA-feeyapla-yurkul) erupted many times over the course of 10 weeks three years ago. These outbursts spewed a giant plume of ash that spread unusually far and stayed for an oddly long time in the atmosphere,forcing widespread flight cancellations for days
Serendipitously, marine biogeochemist Eric Achterberg at the University of Southampton in England and his colleagues were taking part in a series of research cruises in the Iceland Basin region of the North Atlantic Ocean both during and after the eruption. These three cruises allowed the researchers to measure iron concentrations at the ocean's surface before, during and after the eruption in areas directly influenced by the plume of iron-rich ash.

Kommentit (1)

kahannin
Seuraa 
Viestejä3784
Liittynyt6.3.2010
eso
Tulivuoren tuhkan on todettu ”lannoittavan” ympäristöään niin, että kasvillisuus hyötyy paljon siitä.
Nyt on saman havaittu tapahtuvan merialueilla, kun tutkittiin islantilaisen Eyjafjallajökull tulivuoren vuonna 2010 tapahtuneen tulivuorenpurkauksen vaikutuksia merellä.
Jotkut ilmastoaktivistit ovat ehdottaneet raudan käyttämistä valtamerien lannoittamiseksi. Tällä arvellaan voitavan vähentää hiilidioksidia ilmassa.
Tutkimukset varmasti jatkuvat, koska planktonin lisääntyminen lisää myös muuta elämää vesissä ja kalakantojen pitäisi myös lisääntyä.

http://www.icelandreview.com/icelandrev ... .news.aspx

Lainaus
Eyjafjallajökull Eruption Fueled Ocean Blooms
The plume of ash that spread from the eruption of volcano Eyjafjallajökull, South Iceland, in 2010 increased the iron concentrations at the ocean’s surface, which helps spur the growth of phytoplankton, a basis of the food chain, by about 20 to 45 percent.
Marine biogeochemist Eric Achterberg from the University of Southampton and his colleagues took part in research in the Iceland Basin region during and after the eruption, livescience.com reports.
According to Achterberg, it was the first time that scientists had been able to research the immediate effects of ash falling into the ocean.
At the same time, nitrate levels were almost depleted, suggesting that the higher amounts of phytoplankton consumed the nutrient.
Carbon dioxide uptake by phytoplankton was found to have increased by 10 to 20 percent, considered a blow to geoengineering schemes which aim to reduce CO2 by adding large amounts of iron to the world’s oceans.
Achterberg and his colleagues published their findings in the journal Geophysical Research Letters.

http://www.livescience.com/28105-icelan ... ocean.html

Lainaus
Iceland Volcano Eruption Fueled Ocean Blooms
Charles Q. Choi, OurAmazingPlanet Contributor
Date: 21 March 2013 Time: 04:43 PM ET
The explosive volcanic eruption Iceland saw in 2010 may have disrupted life in the air above Europe, but it apparently enriched life in the Atlantic Ocean, researchers say.
After nearly two centuries of dormancy, the volcano Eyjafjallajökull (AYA-feeyapla-yurkul) erupted many times over the course of 10 weeks three years ago. These outbursts spewed a giant plume of ash that spread unusually far and stayed for an oddly long time in the atmosphere,forcing widespread flight cancellations for days
Serendipitously, marine biogeochemist Eric Achterberg at the University of Southampton in England and his colleagues were taking part in a series of research cruises in the Iceland Basin region of the North Atlantic Ocean both during and after the eruption. These three cruises allowed the researchers to measure iron concentrations at the ocean's surface before, during and after the eruption in areas directly influenced by the plume of iron-rich ash.




Raudan tiheys on 7,8 kertaa suurempi kuin veden tiheys. Se merkitsee, että rauta välittömästi meriveteen levitettynä alkaa upota kohti pohjaa. Esimerkiksi jätevesien puhdistuksessa käytetään rautasuoloja muodostamaan kakkakikkaroita kerääviä flokkeja, jotka sitten painuvat melkoisella vauhdilla ilmastusaltaiden pohjalle.

Rautalannoitus kertaeränä suoritettuna ei välttämättä säily fotosynteettisessä vesipatjassa niin kauan, että sillä ehtisi olla merkittävää lannoittavaa vaikutusta planktonin kasvuun. Sopivalla frekvenssillä uusittuna tehoa voidaan toki parantaa, mutta kustannukset olisivat huimat.

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