Verdens ekstremt vejr...

The current analysis uses surface air temperatures measurements from the following data sets: the unadjusted data of the Global Historical Climatology Network (Peterson and Vose, 1997 and 1998), United States Historical Climatology Network (USHCN) data, and SCAR (Scientific Committee on Antarctic Research) data from Antarctic stations.

The GHCN/USHCN/SCAR data are modified in two steps to obtain station data from which our tables, graphs, and maps are constructed. In step 1, if there are multiple records at a given location, these are combined into one record; in step 2, the urban and peri-urban (i.e., other than rural) stations are adjusted so that their long-term trend matches that of the mean of neighboring rural stations. Urban stations without nearby rural stations are dropped.

The number of major Atlantic hurricanes per year may almost double by the end of the century in response to global warming, according to a new study.

A team of hurricane researchers suggests that damage from a larger number of very strong — Category 4 and 5 — hurricanes is likely to outweigh a projected decline in less-intense storms1.

The projection that there will be fewer but more intense Atlantic hurricanes is in agreement with results of other groups that have used high-resolution climate models to study hurricane activity.

The world's mountainous regions are home to about 800 million people and the source of some of the world's major rivers. In these regions, runoff is strongly affected by temperature. This suggests that flooding could be quite sensitive to global warming, but there has been some lack of scientific consensus on the effects of temperature variations on floods.

The authors analyzed runoff data recorded by 27 stations in the Swiss Alps...The researchers found that large floods have occurred more frequently in recent years than in the past, and they predict that global warming will result in such floods occurring even more often in the future.

In particular, they found that if global temperatures increase by 2 degrees Celsius, then large floods that occurred about once every 100 years could occur up to 5 times more often.

Recent observations show that Beaufort Sea ice was not as it appeared in the summer of 2009. Sea ice cover serves as an indication of climate and has implications for marine and terrestrial ecosystems.

In early September 2009, satellite measurements implied that most of the ice in the Beaufort Sea either was thick ice that had been there for multiple years or was thick, first-year ice.

However, in situ observations made in September 2009 by Barber et al. show that much of the ice was in fact "rotten" ice -- ice that is thinner, heavily decayed, and structurally weak due to a uniform temperature throughout.

NATURE:...

The research aircraft "Polar 5" today concluded its Arctic expedition in Canada. During the flight, researchers measured the current ice thickness at the North Pole and in areas that have never before been surveyed. The result: The sea-ice in the surveyed areas is apparently thicker than scientists had suspected.

Hvis nogen finder linket vil jeg gerne modtage et praj om hvor artiklen findes

Prøv at se lidt nærmere på de øvrige artikler og indslag han har lavet... det er IKKE en public service station værdigt

Med en middeltemperatur for hele måneden som helhed på -3,2 grader, så skal vi nemlig helt tilbage til 1987 for at finde en måned, der har været koldere.

Januar 2010 skriver sig således ind i historiebøgerne, som den den koldeste i nyere tid - og dermed er den både koldere end februar 1996 (-2,9 grader) og januar 1996 (-1,8 grader), hvor vi oplevede den seneste isvinter i Danmark.

Kulde i Mongoliet

..the disastrous weather pattern - known locally as a 'zud'..

Locals sometimes differentiate between black, white, and iron/ice zuds....In 1999/2000, 2000/2001 and 2001/2002, Mongolia was hit by three zuds in a row, in which a combined number of 11 million animals were lost. In 2009/2010, approximately 90% of the country was affected by a white zud. By the beginning of February, close to 2 million heads of livestock had perished, and the agriculture ministry predicted that livestock losses might reach 4 million until the end of winter

Bare lige så De er opdateret: I Vancouver blev mændenes styrtløb ved vinter-OL aflyst lørdag på grund af for megen varme. I weekenden var der 12 plusgrader i den olympiske by mod knap fem som det normale for februar. I stedet for sne har Vancouver nu påskeliljer.

Og i Rio de Janeiro blev weekendens karnevalsstart en livsfarlig prøvelse efter temperaturer i dagene forud, der med 46,3 grader var de højeste i den brasilianske storby i 50 år.

For kloden som helhed har University of Alabama netop offentliggjort nye data, som fortæller, at sidste måned blev den varmeste januar i 32 år. I kølvandet på et 2009, der ifølge NASA blev det næstvarmeste år i temperaturmålingernes historie.

Dét kan være godt at vide, hvis man tilfældigvis befinder sig et af de få steder på kloden, hvor det lige nu er rigtig koldt. Som her i det isbelagte Danmark. Eller som i Washington DC, der de seneste dage har været ramt af voldsomt snefald. I den amerikanske hovedstad er udsynet så begrænset, at toneangivende medier og politikere nu bruger det kraftige regionale snevejr til at erklære den globale opvarmning aflyst.

While raising average global temperatures, climate change could also bring more snow, harder rain, or heat waves, meteorologists say. Computer models based on climate data from nine countries indicate every place on the planet will be hit with extreme weather events, including coastal storms and floods.

Whether it's never-ending heat waves or winter storms, atmospheric blocking can have a significant impact on local agriculture, business and the environment. Although these stagnant weather patterns are often difficult to predict, University of Missouri researchers are now studying whether increasing planet temperatures and carbon dioxide levels could lead to atmospheric blocking and when this blocking might occur, leading to more accurate forecasts.

Atmospheric blocking occurs between 20-40 times each year and usually lasts between 8-11 days....Although they are one of the rarest weather events, blocking can trigger dangerous conditions, such as a 2003 European heat wave that caused 40,000 deaths. Blocking usually results when a powerful, high-pressure area gets stuck in one place and, because they cover a large area, fronts behind them are blocked.

"It is anticipated that in a warmer world, blocking events will be more numerous, weaker and longer-lived," Lupo said. "This could result in an environment with more storms. We also anticipate the variability of weather patterns will change dramatically over some parts of the world, such as North America, Europe and Asia, but not in others."

Atmospheric blocking occurs between 20-40 times each year and usually lasts between 8-11 days....

Although they are one of the rarest weather events, blocking can...

The unusually chilly weather so far this year has seen sea temperatures plummet in southern Florida -- a fatal development for the coral, which dies when exposed for an extended time to temperatures below 15 degrees Celsius (59 degrees Fahrenheit).

"The Keys have not seen a cold-water bleaching event like this since the winter of 1977-78.."

The state's myriad of tropical animals also have been impacted by the cold snap so far this year, with iguanas dropping from trees and manatees huddling around waters warmed by power plants.

"It is likely that the global frequency of tropical cyclones will either decrease or remain essentially unchanged," says the paper.

But storms could have more powerful winds -- an increase of between two and 11 percent -- and dump more water, it warns.

Rainfall could increase by 20 percent within 100 kilometres (62 miles) of the eye of the storm.

In addition, some storm basins will "more likely than not" see a big increase in the frequency of high-impact storms.

The findings broadly concur with those of the UN's panel of climate scientists, which in a 2007 report said it was "likely" that tropical cyclones would become more intense this century, with heavier rainfall and stronger wind speeds.

Der er nu større sikkerhed i fremskrivningerne for opvarmningsmønstre og andre elementer på regionalt plan end i tredje vurderingsrapport, herunder ændringer i vindmønstre, nedbør og visse aspekter af ekstreme forhold og havis.

*Det er meget sandsynligt, at varme ekstremer, hedebølger
og kraftigt nedbør vil optræde med stigende hyppighed

* En stigning i intensiteten af tropiske cykloner er
sandsynlig. Det er mindre sikkert, at antallet af tropiske
cykloner vil falde globalt set

* Uvejrsbaner uden for troperne forskydes i retning mod
polerne, hvilket medfører ændrede vind-, nedbørs- og
temperaturmønstre

* Det er meget sandsynligt, at nedbørsmængderne stiger på
høje breddegrader, og sandsynligt, at de falder i de fleste
subtropiske landområder, hvilket er i forlængelse af nyligt
observerede tendenser.

Der er stor sikkerhed for, at den årlige flodafstrømning og
vandtilgængelighed vil stige på høje breddegrader (og i
nogle våde tropiske områder) og falde i nogle tørre regioner
på mellembreddegrader og i troperne inden midten af dette
århundrede.

Der er ligeledes stor sikkerhed for, at mange
semiaride områder (f.eks. omkring Middelhavsbækkenet og
det vestlige USA, sydlige Afrika og nordøstlige Brasilien) vil
komme til at lide under faldende vandressourcer som følge
af klimaændringer.

Jeg er ikke istand til at afgøre, hvormeget der kan tilskrives de omtalte effektet.

"Farming has now become completely different and difficult...When the rain comes, it pours continuously for almost a whole day causing damage to crops. The weather pattern is in disarray. There is either too much rain causing floods, destroying houses and washing away fields, roads and bridges or there is drought. The situation is getting worse every day" says Mr Siangoma is a headman at Malundu Village in Lusitu area of Siavonga

Climate change is an issue that has affected many farmers' livelihoods world over. But at the same time, unsustainable farming practises are said to contribute to climate change, posing a great challenge to environmental sustainability, particularly through deforestation as they continue to search for productive agriculture farmlands.

But at the same time, unsustainable farming practises are said to contribute to climate change, posing a great challenge to environmental sustainability, particularly through deforestation as they continue to search for productive agriculture farmlands.

While the above is a reality, the Copenhagen climate negotiations that were expected to give immediate hope to the helpless farmers, by and large concluded in what was code named "No Deal" i.e. without the expected ambitious legally binding framework necessary for supporting, especially those most affected to deal with the impacts already experienced.

En meget snerig vinter langs USA's Østkyst kulminerede foreløbigt fredag, da der efter et kraftigt snevejr lå 30-40 cm sne i New Yorks gader fredag morgen.

Western Australia has sweated through its hottest ever summer, recording average temperatures just shy of 30 degrees Celsius, officials said on Monday.

Weather officials said the giant, dusty state roasted at an average of about 29,6 Celsius during the southern hemisphere summer, 0,2 degrees over the previous high in 1997-1998.

The state capital Perth also endured its driest summer since records began in 1897, with just 0,2 millimetres of rain falling in December, January and February.

State-wide information is only available since 1950.

"Certainly we had below average rain in the south-west of the state for the start of the year," Stephen McInerney, duty forecaster at the state's weather bureau, told AFP.

"For the next three months we're expecting a 65 percent chance of lower than average rainfall, so we're looking at a continuation of the dry conditions."

Severe weather in Australia, parts of which have been hit by a 10-year drought, has heightened public concern over climate change especially after the country's worst ever bushfires claimed 173 in the state of Victoria last year.

Prime Minister Kevin Rudd was elected on a strong environmental platform in 2007 and took a leading role at the Copenhagen UN climate talks in December, despite his failure to pass flagship carbon-trading laws.

Western Australia, which is bigger than Western Europe and about four times the size of Texas, was also hit by fires last year when 38 homes north of Perth were engulfed in December.

Fredag huserer et usædvanligt vejrfænomen i det sydlige Atlanterhav: en tropisk cyklon. Kun én gang tidligere - i 2004 - er en af de store, varmekrævende snurrebasser observeret syd for Ækvator i 'vores ocean' Atlanten.

Når tropiske cykloner så sjældent huserer øst for Sydamerika, så skyldes det, at vandet normalt er for koldt. En af de grundlæggende betingelser for en tropisk cyklon er nemlig, at havvandet den befinder sig over, er omkring 26,5°C eller derover.

The observed and predicted trends towards an increasingly positive phase of the Southern Annular Mode in global warming scenarios could favor similar conditions, increasing the probability of more Tropical Cyclones in the South Atlantic.

In the Southern Hemisphere, both the February 2010 average temperature for land areas and the Hemisphere as a whole (land and ocean surface combined), represented the warmest February on record. The Southern Hemisphere ocean temperature tied with 1998 as the warmest February on record.

A severe drought across a large swathe of southwest China is now affecting more than 50 million people, and forecasters see no signs of it abating in the short term, state media said on Friday.

The drought began last autumn, and is the result not only of less rainfall but also unseasonably high temperatures, the official Xinhua news agency said, citing a central government meeting on the situation.

It is affecting the provinces and regions of Guangxi, Sichuan, Guizhou and Yunnan and the municipality of Chongqing. These parts of China are known for their sugar and rubber plantations.

The drought is the worst in Yunnan in six decades, and has affected 85 percent of the province's agricultural land.

global opvarmning gav mere nedbør

Changes in precipitation show robust large-scale patterns: precipitation generally increases in the tropical precipitation maxima, decreases in the subtropics and increases at high latitudes as a consequence of a general intensification of the global hydrological cycle.

Mean Precipitation

For a future warmer climate, the current generation of models indicates that precipitation generally increases in the areas of regional tropical precipitation maxima (such as the monsoon regimes) and over the tropical Pacific in particular, with general decreases in the subtropics, and increases at high latitudes as a consequence of a general intensification of the global hydrological cycle. Globally averaged mean water vapour, evaporation and precipitation are projected to increase.