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Catalogue: GRDC Research Summaries
" Teleconnections between climate drivers and regional climate, and model representation of links.. Project Code: MCV00007.. Weather is influenced by many interconnected systems in the atmosphere, ocean and on land; small changes in one part of the world can impact on the weather in another part - days, weeks and even years later < Keep browsing..
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Catalogue: Ground Cover
For a La Ni a to develop, the relatively high-frequency fluctuations of SOI, winds and ocean temperatures would need to stop and be replaced by a period of consistently stronger-than-average trade winds, positive SOI values and further cooling of the ocean... Although July 2007 was wetter than July 2006 in western WA, Victoria and south-east SA, and there was a slight easing of 12-month deficits in those regions, south-east Queensland, Tasmania and the Eyre Peninsula experienced a drier July this year... A large part of south-east Queensland was also affected, as were Tasmania (except for the south-west) and parts of western WA between Carnarvon and Perth, as well as areas between Wagin and Albany...
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Catalogue: GRDC Media
Dr Andrew Watkins explains what these climate indicators mean for grain growers... El Ni o events usually last for one season, developing in autumn and winter and starting to dissipate by summer, though have been known to last between six months and two years... "The effect of a positive IOD is similar to El Ni o, though it is shorter lived as it usually starts in winter and collapses in late spring-early summer, when the monsoon season starts...
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Catalogue: GRDC Media
Dr Andrew Watkins explains what these climate indicators mean for grain growers... El Ni o events usually last for one season, developing in autumn and winter and starting to dissipate by summer, though have been known to last between six months and two years... "The effect of a positive IOD is similar to El Ni o, though it is shorter lived as it usually starts in winter and collapses in late spring-early summer, when the monsoon season starts...
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Catalogue: GRDC Factsheets
Climate and weather forecasting continue to improve as the Bureau of Meteorology (BoM) develops and refines new technology and modelling... The Southern Oscillation Index (SOI) is a measure calculated from sea level pressure differences between Tahiti and Darwin, and indicates El Ni o or La Ni a intensity... Planned upgrades will soon offer improvement in several areas...
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Catalogue: Ground Cover
The Walker circulation is a loop of winds over the Pacific Ocean that influences much of the region's climate... A weakening system indicates an El Ni o event, increasing the risk of drought in Australia... Warm and wet for the west A warmer than average end to the year is predicted across Australia, although rainfall trends vary from east to west, with higher seasonal falls expected in western WA and a drier than average season more probable in the far south-east of the country (see maps)...
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Catalogue: GRDC Updates
The first problem is that it is difficult to get reliable information on where these indicators are likely to go for the coming season... The second problem is that dividing the historical record into combinations of ENSO, IOD and SAM is problematic due to interactions between these factors but more importantly because the historical record is far too small for the combinations leading to small sample sizes... A third problem is that there has been warming of the oceans due to climate change and this leads to complications in the statistics of the historical record...
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Catalogue: GRDC Updates
Good early season rainfall in south-east Australia in 2007 indicated the break-down of the dry conditions in 2006 which were caused by a weak El Nino together with a positive Indian Ocean Dipole (IOD)... History is of little use in terms of the transition from the La Nina/+IOD of 2007... The MJO can be monitored in real-time [14], and a useful commentary is provided by APSRU [15]...
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Catalogue: NVT Online Papers
The second edition of The Wheat Book has been somewhat changed from the original edition... Most of the authors are employed by Agriculture Western Australia and most have contributed their time and talents as an extra-curricular activity... In the wet years, pressures were lower around Australia (particularly south of Western Australia) suggesting an increase in cold front activity...
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Catalogue: Ground Cover
Australia finished 2007 with nearly average rainfalls the timing of these events meant that many winter crops missed out on in-season falls By Rebecca Thyer When it comes to rain, timing is everything, something that many growers can attest to after missing out on crucial in-season rains last year, only to have them fall at harvest time... Dr David Jones, head of climate analysis at the Bureau of Meteorology's (BoM) National Climate Centre, says the irony of 2007 is that the year as a whole ended with almost average rainfalls across the eastern and southern states - it just fell at the wrong time. ".. Dr Jones says the dry conditions were not linked to the late onset of La Ni a, a weather event normally associated with increased rainfall during winter. "..
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