Author: MATT CAWOOD
Via: Farm Weekly - online

NASA’s Goddard Institute for Space Studies (GISS) has placed 2009 as the warmest year in the Southern Hemisphere since records began 130 years ago, and the past decade as the warmest globally.

Globally, 2009 tied with 1998, 2002, 2003, 2006 and 2007 as the second warmest year on record after 2005, according to the GISS analysis of planetary temperatures.

The decade from January 2000 to December 2009 was clearly the warmest since modern instrumentation was introduced in 1880.

“There’s substantial year-to-year variability of global temperature caused by the tropical El Nino-La Nina cycle”, said GISS director James Hansen.

“But when we average temperature over five or ten years to minimize that variability, we find that global warming is continuing unabated.”

Over the past three decades, according to the GISS analysis, the global average temperature has increased 0.2 degrees Celsius a decade.

The Australian Bureau of Meterology (BoM) is waiting on the results of a similar analysis by the UK Met Office’s Hadley Centre, which BoM has traditionally used as a guide to global temperature trends.

The Hadley Centre analysis tends to be more conservative than GISS, according to BoM senior climatologist Dr Karl Braganza, because Hadley scientists leave out areas of the Arctic and Antarctic where climate monitoring stations are scarce.

GISS extrapolates data for these areas from the nearest monitoring stations in an attempt to deliver a fuller climate picture.

In the Hadley analysis, polar areas without monitoring stations are assumed to be warming at the same rate as the global average. GISS incorporates sea ice data from satellites that indicates the Arctic is warming faster than the rest of the planet.

Dr Braganza said while the two methods produce slightly different results - although often within a tenth or a hundredth of a degree - both show the same global warming trend.

A key driver of natural climate variability is the El Nino-La Nina cycle, which stems from the cyclic warming and cooling of the Pacific Ocean.

GISS and BoM climatologists believe the El Nino of late 2009 combined with greenhouse gas-driven warming to produce an unusually warm year in 2009.

“The unusual thing about this El Nino when it got going around mid-2009 was that Pacific ocean temperatures were already very warm, which was likely a continuation of the greenhouse warming effect,” Dr Braganza said.

That warmth across the Pacific generated rain, which counteracted the usual El Nino drying effect on eastern Australia for several months. But as the year went on, across eastern Australia as a whole it was very dry.

“Tasmania got some good rainfall, and Victoria had two or three rainfall events, but they were just weather events. Typically during an El Nino we get less of them.

“When you are talking about climate, you’re talking about what history can tell you might happen over a particular stretch of time–but during an El Nino, you can still get a good rainall event coming through with the normal weather that gives a bit of relief.”

The global warming trend, which is reflected in the warming of the Australian temperature record, appears to be continuing despite the deepest recorded solar minimum.

During solar maximums, high sunspot activity is generally correlated with higher surface temperatures on Earth. Solar minimums, or low sunspot activity, are generally related to cooler temperatures, but this is not the case during the current minimum.

Aerosols, particularly sulfate aerosols produced by volcanoes, are also known to cool global temperature by reflecting sunlight, but aerosols appear not to have played a significant role during 2009.

Source: http://fw.farmonline.com.au/news/nationalrural/agribusiness-and-general/general/warmest-since-records-began-2009/1734382.aspx?storypage=1

Posted: 1 February 2010 under Agribusiness worldwide, australia.
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Author: TRAVIS KING

DESPITE the sharp rise in sheep export prices over the past eight months, demand for Australian sheep in the Middle East is holding strong.

And this demand is not expected to drop off according to Livecorp livestock services manager Peter Dundon.

Mr Dundon, who is based in Bahrain, said if Australian producers were debating whether they should be sticking with sheep or not, he would strongly suggest they do.

“While there is some resistance to the higher prices, importers are still keen to source Australian sheep simply because of the food security issue,” Mr Dundon said.

“While the fact that there are higher prices has seen some importers look to northern Africa to source sheep, no one can guarantee supply like Australia can.

“Bahrain demands 2500 sheep per day and Australia supplies 95 per cent of that market.

“If the trade to Bahrain stopped tomorrow, a whole lot of people would not have access to fresh meat.

“Somalia is probably our biggest competitor and are closest to Australian sheep in price, but Somalian sheep are about half the weight. They dress out at 11 kilograms as opposed to Australian sheep that have a 21-23kg carcase weight.

“Northern African countries also continually have issues with Foot and Mouth Disease and Rift Valley Fever and that disrupts supply.”

Mr Dundon admitted that there had been a marked change in the composition of the sheep that have been exported live to the Middle East in the past five years.

“We are now sending lighter sheep than we used to, but that is a reflection of the changing Australian sheep flock,” he said.

“Sheep are now being turned off at a younger age, so they are going to be lighter.

“Weights are also influenced by seasons. Seasonal conditions over the last couple of years have probably contributed to lighter weight sheep coming through, but at certain times of the year there are good heavy wethers sent over.

“I think if there is a readjustment to the Australian sheep flock and more people go back into sheep you will start to see heavier weights coming through again.”

Mr Dundon said there were more ewes being exported now compared to five years ago.

“This is concerning because, while some importers are happy to take them, we would rather see those ewes remaining in Australian paddocks and being used for breeding,” he said.

“The fact more ewes are now exported is an indication Australian farmers are going out of sheep and we want more sheep being produced not less.”

Source: http://fw.farmonline.com.au/news/state/livestock/sheep/live-export-demand-defies-rising-prices/1725447.aspx?src=enews

Posted: 18 January 2010 under Agribusiness worldwide, australia.
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THE ability of microscopic plants to increase soil carbon and nitrogen levels may hold the secret for land managers in Australia’s arid landscape to benefit from bio-sequestration, according to rangeland ecologist Wendy Williams of the University of Queensland.

It is good news for producers who graze livestock on the arid or semi arid rangelands - regions with less than 500mm of rainfall - which form more than 70 percent of Australia’s landscape.

“Simple, microscopic plants grow on the soil surface of these areas, generally forming large masses or colonies which are visible on bare soil between plants or on rocks,” Ms Williams said.

“These single-celled micro-organisms were once called ‘terrestrial blue green algae’ and are now more correctly known as cyanobacteria, and well-managed grazing practices can encourage cyanobacterial soil crusts to thrive within their natural environment.”

Ms Williams explained that through the process of photosynthesis, cyanobacteria utilises carbon dioxide and converts it into biomass while replacing oxygen back into the atmosphere.

They thrive in harsh environments ranging from the Antarctic to hot deserts and rock surfaces where temperatures exceed 70 deg C.

“Ancient cyanobacteria were so productive that they changed earth’s atmosphere from a CO2-rich state to the oxygenated atmosphere that supports life as we know it today,” she said.

“Recent research on a global scale shows cyanobacterial soil and rock crusts account for significant amounts of net terrestrial carbon and more than 40 percent of biologically fixed nitrogen.

“This nitrogen is in a form immediately available to plants and is crucial to carbon capture.

“Increasing the terrestrial carbon sink can be tricky, as Australia has limited water and nutrients, however, place cyanobacteria in the picture and the situation appears much more favourable.

“Cyanobacteria are a natural asset in the Australian landscape and in that context are freely available to be used for our benefit - for example, Queensland has abundant cyanobacterial crusts on soil and rocks across the Mulga lands, Channel Country, Gulf Plains and Cape York.

Source: http://qcl.farmonline.com.au/news/state/agribusiness-and-general/general/cyanobug-unlocks-soil-carbon-potential/1662585.aspx?src=enews

Posted: 3 November 2009 under Agribusiness worldwide.
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