Posts Tagged ‘Hitech’

Hi-Tech Australian Cow Methane Emissions Study

Scientists in Australia are set to use hi-tech measuring equipment to try and establish the impact of cow emissions on climate change. Employing reflectors and lasers, they’ll attempt to get a much more accurate picture than previous studies of this kind have managed.

Spearheaded by the University of Melbourne, this is an emissions-monitoring programme also involving four other universities and CSIRO – the Commonwealth Scientific and Industrial Research Organisation.

With agricultural emissions responsible for approximately 10 per cent of all Australia’s greenhouse gas output, they’ll aim to deliver a better way of measuring and managing methane emissions in Northern Australia, whose cattle population is believed to account for no less than five per cent of the nation’s emissions total.

Cow Methane Emissions

According to the University of Melbourne’s Professor Deli Chen, who’s one of this cow methane emissions programme’s leaders, the scientists will use innovative techniques and observe these cows grazing in real-time.

One method will involve laser beams which, after being streamed across a several-hundred metre range, will hit a reflector, sending them back again. “The frequency of the laser is sensitive to the methane gases in the air”, Professor Chen explained, “[so)…we can measure the concentration of the methane gases across the paddock.”

Australian Cow Emissions

This Australian cow emissions study’s been named the Livestock Methane Research Cluster and, in further comments, Professor Chen referred to it as “a critical step if we are to help agriculture reduce its emissions because, if you can’t measure, you can’t mitigate.”

Australia’s presently aiming to have achieved an overall 80 per cent greenhouse gas emissions reduction by the middle of this century, compared to 2000 levels.

Methane, while less publically-visibly than CO2, is nonetheless a highly powerful greenhouse gas. A carbon/hydrogen compound with no odour and no colour, methane is highly effective at trapping solar energy and is twenty times better at doing this than carbon.

Enviro News – News

Environment Agency: Hi-tech camera monitors migrating eels

Until recently, scientists knew when adult eels set off for the Sargasso Sea to spawn, but were unable to record the number of eels leaving our rivers on their epic 3,000 mile journey across the Atlantic.

Now, thanks to a hi-tech acoustic camera, the Agency can track the movement of these creatures as they set off on their migration. The device, that uses sound waves (sonar), has been placed in the Huntspill River in Somerset to capture images of eels. Data collected will provide a valuable insight into the eel’s mysterious life cycle.

The American-made instrument was originally designed to carry out safety checks on oil rigs detecting hairline cracks on metal surfaces. Acoustic cameras are particularly useful in locations where visibility is poor such as underwater sites. Images of near video quality are captured using sonar instead of light waves.

The use of this equipment on the Huntspill is providing the Environment Agency with valuable information on eel numbers. Measuring up to a metre in length, adult eels head out to sea between October and January after growing to maturity in our rivers. Some are up to 20 years old.

There has been a 95% decline in the eel population over the past 30 years as a result of over fishing, pollution, loss of habitat and disease. It is thought changes in ocean currents caused by climate change may also have reduced their numbers.

Eels stop feeding prior to migration and undergo complex physiological changes. Bizarrely, their digestive systems are absorbed into their bodies and replaced with reproductive organs. A number of factors influence the timing of their migration including water temperature, phases of the moon and rainfall.

The acoustic camera on the Huntspill has already produced some excellent images of eels at the start of their migration. Data collected this winter will be compared with a base line survey carried out two years ago when the equipment was first trialled.

‘The introduction of the acoustic camera is our first real chance to record and capture eel numbers by direct observation and increase our understanding of the creature’s mysterious life cycle,’ said Pete Sibley for the Environment Agency.

A video clip clearly showing an eel passing the Huntspill monitoring camera is available from the Environment Agency’s regional press office on 01392 442008.

Notes to Editors:

• The European eel spends its early life in our rivers before heading across the Atlantic to the Sargasso Sea off the Bahamas to spawn. Although the spawning site has been known since 1922, no adult eels have ever been found in the Sargasso Sea – only their tiny larvae. This is one of the last great biological mysteries being studied by scientists using satellite tracking.

• Eggs laid in the Sargasso Sea hatch into transparent larvae that make the return journey to Europe floating on ocean currents. By the time they reach our shores, the larvae have developed into glass eels that swim into our rivers where they become elvers that, in turn, grow into adult eels.

• Eels are very efficient swimmers. They are also good at saving energy. Research has shown that after reaching the west coast of Africa they hitch a lift on powerful ocean currents that carry them across the Atlantic to the Sargasso Sea. After completing their incredible 3,000 mile journey, they spawn then die.

 

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