Menu
Science and knowledge
New frog discovered in New York City
Why the 'Man in the Moon' faces Earth
Jilted fruit flies turn to alcohol
Fertilisers behind increase in N2O levels
Early Earth hazy one day, clear the next
Could air pollution be making us fat?
Frog skin protein may help fight superbugs
Electrotherapy dampens brain connections
Satellite images spot early settlements
Chemistry helps sperm find the right egg
Social butterflies find safety in numbers
Ibuprofen reduces altitude sickness: study
Mercury findings raise new questions
Megafauna collapse led to mega changes
New device invisible to magnetic fields
Travelling gnome answers weighty question
Study throws Moon theory up in the air
James Cameron reaches bottom of Pacific
Link builds between extremes and warming
Some chocolate-eaters have lower BMI
Dingoes, devils may be angels in disguise
Barefoot running less energy efficient
Dolphin males share human social network
Recycled spectacles twice that of new: study
Fertilisers behind increase in N2O levels
The increasing amount of nitrous oxide in the atmosphere over the last 65 years is due to nitrogen-based fertilisers, according to a new study.

An international team of scientists, led by University of California-Berkeley researcher Dr Sunyoung Park, made the finding after studying air collected at the Cape Grim Station in Tasmania and sampled from the Antarctic ice sheet.

Previous studies have shown a 20 per cent increase in the level of N2O since 1750 - from below 270 parts per billion to more than 320 ppb.

Despite being relatively low in concentration, N2O is considered a significant contributor to global warming (about 6 per cent) and also destroys ozone in the stratosphere. It is produced naturally and by human activities such as agriculture.

According to this latest report, which appears this week in the online edition of Nature Geoscience, changes in the ratio of nitrogen-14 and nitrogen-15 point to the use of agricultural fertilisers as the main source of the increase.

"In this new paper we used isotopes - slightly different forms of nitrogen and oxygen atoms in the N2O molecule - as tracers of what the sources are behind that increase," says paper co-author Dr David Etherege, a principal research scientist at CSIRO in Marine and Atmospheric Research in Melbourne.

"We know that when fertiliser is added to soils it stimulates microbes to release N2O with the lighter form of nitrogen-14. Over the Industrial Period we see a decline in the ratio of [nitrogen-15]," he says. "So those two bits of matching pieces of information let us know that [the growth in N2O is] consistent with the use of agricultural fertilisers."

The researchers also measured the seasonal cycle in N2O and its isotopes, which provide a picture of its movement between the soils and oceans, atmosphere and stratosphere. They say this information could improve models used to predict future levels.

They also examined the subtle changes in the growth rate of N2O from year to year, which according to Etheridge highlight the effect of climate phenomena such as ENSO (El Nino-Southern Oscillation).

He says El Nino is typically associated with periods of dry weather, which could lead to increased biomass burning, while La Nina causes more mixing in the oceans. Both of these processes would release more N2O into the atmosphere.
Understanding the impact

The use of fertilisers in agriculture, both for food and biofuel production, is expected to increase as demand for both rises.

But Etheridge is quick to point out that the study isn't about demonising N2O and the use of fertilisers. Instead, he says this study will help feed into agricultural research aimed at improving fertiliser use and tilling practices, which could reduce emissions of N2O as well as the amount of fertiliser consumed.

"There's a potential economic win, as well as an environmental win, in not overly using fertilisers in crops," says Etheridge.

"The first thing to do is start with an understanding of 'Is there a problem?' and if so what is causing it, and then you can apply with a little more information how to mitigate the problem. I think that is what's happening here."

Для печати
Astronomers uncover stardust origins
Guns make people seem bigger
Traditional Chinese medicines under scrutiny
Baboons leave scientists spell-bound
Mars Viking robots 'found life'
Nothing helps create pure randomness
Jet lagged bees may help patient recovery
Study calls for regulating salt in fast foods
NASA clears SpaceX for space supply run
Egg size was dinos ultimate undoing
Peripheral vision snaps brain 'video' power
Study raises hopes of cure for baldness
Cosmic rays leave scientists in the dark
Bone-protecting protein discovered
Thylacine DNA reveals lacks of diversity
Aspirin's fat burning mechanism found
Polar bears are no new kids on the block
Calls back evolutionary gender theory
Asteroid impact pushes life underground
Arctic Ocean could be source of methane
Statins don't reduce melanoma risk
Facebook beauty is more than screen deep
Your brain could become your password
One hit of ecstasy 'resets body clock'
Antacid armour key to tetrapod survival
Fathers just as likely to get baby blues
Maths explains left-handed boxer success
Scientist claims to have found G-spot
Menu
Sprawling cities pressure environment
Fossil raindrops reveal early atmosphere
Fossil find reveals steps back in time
Report suggests new formula for Earth
Handprints may give away your height, gender
Monster solar tornadoes discovered
Study reveals why some soccer players dive
Teen brains undergo neural pruning
Martian dark spots reveal heart of glass
Cave holds earliest sign of fire-use
Stress may alter body's immune response
Japanese bees cook enemy in 'bee ball'
Tired locusts hold breath to rest their brains
X-rays shed new light on lung function
Mutant bird flu 'much less lethal'
T-rex had a giant feathered ancestor
Carbon dioxide ended last Ice Age: study
Saving ships from Titanic's fate
Dental x-rays linked to brain tumours
Fire-free farming in pre-Columbian Amazon
Teamwork made humans brainier: study
Drug data should be made public: report
Omega-3 pills may not help heart disease
Pigeons' sixth sense eludes scientists
Visit Statistics
http://google.com/

http://bing.com/

https://gepatit-info.top/

https://serdechnic.com/

https://buy-meds24.com/

https://dverirespekt.ru/

https://www.sribno.net/

https://undergroundcityphoto.com/

https://detskiezabolevaniya.com/

http://grafaman.ru/

http://innoslicon.com/html/product/index.htm

https://yginekologa.com/

https://yes-com.com/

https://www.baikaleminer.com/

https://bitmaein.com/shop

https://www.artdeko.info/

https://aerodizain.com/

http://xn--d1abj0abs9d.in.ua/

http://lider82.ru/

http://sta-grand.ru/

http://snabs.kz/

https://sky-mine.ru/

https://rybalka-opt.ru/

http://snegozaderzhatel.ru/

https://xn--e1aaajzchnkg.ru.com/

http://hit-kino.ru/

http://www.regionshop.biz/

https://xn--80aaafbn2bc2ahdfrfkln6l.xn--p1ai/

https://pp-budpostach.com.ua/

https://vykup-avto-krasnodar.ru/

https://gcup.ru/

https://mega-polis.biz.ua/

http://vanrise.com.ua/

http://infra-e.ru/

https://veterinariya.com/

https://ponosanet.com/

https://cariestop.com/

https://proartrit.com/

https://elonm.ru/

https://nakozhe.com/

https://spinanebolit.com/

http://zameskino.ru/

http://kinoprinc.ru/

http://pospektr.ru/

http://buypillsonline24h.com/

http://komputers-best.ru/

https://komp-pomosch.ru/