Verdens ekstremt vejr...

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. {3.2.2}

Ændringer på regionalt plan omfatter: {3.2.2}

* Opvarmning er størst over land og ved de fleste høje
nordlige breddegrader og mindst over Det Sydlige Ishav og dele af det nordlige Atlanterhav, hvilket er i forlængelse af nyligt observerede tendenser (figur SPM.6)

* Snedækkede områder svinder ind, laget med optøning
bliver dybere i de fleste områder med permafrost, og
havisens udstrækning mindskes. I nogle fremskrivninger,
der bygger på SRES-scenarier, vil havisen i Arktis
forsvinde næsten fuldstændigt sidst på sommeren i den
sidste del af det 21. århundrede

* 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. {3.3.1; figur 3.5}

Canada har netop oplevet den varmeste og tørreste vinter nogensinde registreret i verdens næststørste land.

Canadiske meteorologer meddeler, at gennemsnitstemperaturen for landet som helhed i vinteren 2009/10 lå hele 4,0° over det normale.

Det er den absolut varmeste vinter registreret i det nordamerikanske land siden 1948, hvor de systematiske målinger begyndte.

Den hidtil varmeste vinter forekom i 2005/06 med 3,9° over det normale.

Ikke nok med at canadierne har haft det varmt, så skriver vinteren sig også ind som den tørreste i historiebøgerne med 22% mindre nedbør end normalt.

Canadiske forskere er på ingen måde i tvivl om, at deres land er blevet et varmere sted det sidste halve århundrede.

Siden 1948 er vinteren i gennemsnit blevet 2,5° varmere oplyser en ny canadisk rapport.

The study does not question that global warming is also melting ice in the Arctic

In the end, however, summer conditions worked together to save some first-year ice from melting and to cushion the thin pack from the effects of sunlight and warm ocean waters. This summer's weather did not provide the "perfect storm" for ice loss seen in 2007: temperatures were lower than 2007, although still higher than average (Figure 5); cloudier skies protected the ice from some melt; a different wind pattern spread the ice pack out, leading to higher extent numbers. Simply put, the natural variability of short-term weather patterns provided enough of a brake to prevent a new record-low ice extent from occurring.

The authorities said some 200 firemen, police and volunteers had been battling the flames, which have been fanned by strong winds and the heat caused by a severe drought.

Venezuela has been badly hit by a prolonged dry spell that has reduced water levels in its hydroelectric dams to critical levels and triggered the nation's worst electricity crisis.

... the combination of a heatwave and the blazes has left a hazy fog shrouding the city for weeks at a time.

Gad vide om det var dette, der var baggrunden for alarmistnyheden i DR's TV-avis for nylig? http://www.colorado.edu/news/r/f595fae00e6b451d4016ab9a43a049f8.html

It is still accurate to say that for Laos' 6.3 million people, the Mekong River remains a very important part of their everyday lives. But lately, it has also become a source of their daily worries as its water level continues to drop given the drought that has been plaguing wide areas of the Mekong region and South-east Asia.

According to 'Vientiane Mai' newspaper, the Kaolieo Water Station here that used to produce 60,000 cubic metres was down to half of that amount, sending authorities scrambling for shovels and pumps to get water to households and farms.

Indeed, it is quite normal for the Mekong to dry up at certain areas during the dry season, with water levels at their lowest during April and May. This year, however, the levels have dropped far too early, taking many by surprise.

According to the Mekong River Commission (MRC), Mekong River levels are now below those seen in at least 50 years. It also said that these were caused by the relatively short 2009 wet season, as well as the low rainfall last year in China's Yunnan province, northern Thailand, and northern Laos.

Some non-government organisations and the media, however, have also speculated that China may have also been at fault and had been busy filling up its dams located upstream.

"The severe drought situation is the problem of not only one country, so all six countries have to talk and find solutions together," Packno also says. "It's hard to blame China for building dams. Laos and other neighbouring countries constructed dams as well."

Meteorologists have attributed the once-in-a-century drought parching southwest China to climate change.

"The direct reason for the drought is light rain and high temperatures," Ren Fuming, a leading expert at China's National Climate Center

Another expert, Chen Yiyu, an academic at the Chinese Academy of Sciences, also said the year has seen anomalous climate conditions globally and that the drought in China is part of the phenomenon.

Globally, climate-related natural disasters have climbed from less than 50 a year in the 1950s to between 350 and 450 a year in the 2000s. In 2009, extreme weather events affected 55 million people around the world, according to figures released by the UN International Strategy for Disaster Reduction (UNISDR).

The Northeast is seeing more frequent "extreme precipitation events" in line with global warming predictions, a study shows, including storms like the recent fierce rains whose floodwaters swallowed neighborhoods and businesses across New England.

The study does not link last week's devastating floods to its research but examined 60 years' worth of National Weather Service rainfall records in nine Northeastern states and found that storms that produce an inch or more of rain in a day — a threshold the recent storm far surpassed — are coming more frequently.

The study's results are consistent with what could be expected in a world warmed by greenhouse gases, said UNH associate professor Cameron Wake. He acknowledged it would take more sophisticated studies to cement a warming link, though.

"I can't point to these recent storms and say, that is global warming," he said.

Uvejret begyndte sent mandag, og beskrives som det værste Rio har oplevet i 30 år med 288 millimeter regn på 24 timer, hvilket er mere, end der normalt forventes i hele april.

Det australske klima synes at blive mere og mere fjendsk. Temperaturrekorderne slås på stribe, skovene brænder, og tørkeproblemerne er værre end i mands minde. Nu viser forskning, at der ikke kun er tale om spredte begivenheder og følelsesmæssige oplevelser, men at klimaet rent faktisk bliver varmere.

Australiens to førende vejrinstitutter har netop offentliggjort en rapport, som viser, at temperaturen er steget 0,7 grader de sidste 50 år. Gennemsnitstemperaturen er steget hvert eneste årti siden 1960.

Rapporten påpeger også, at havniveauet steg 1,5-3 millimeter i de sydlige og østlige egne og 10 millimeter i de nordlige egne i perioden 1993-2009.

Udgivelsen af rapporten sker samtidig med, at mange australske forskere har udtrykt bekymring for de aktuelle angreb på videnskaben med argumenter mod, at den globale opvarmning er menneskeskabt. Forskerne frygter, at den seneste tids debat har skadet videnskabens ry som helhed. Rapporten skal ses som et faktuelt baseret svar på denne kritik.

I New York har man med temperaturer over 30° haft helt usædvanlig varme for årstiden.

Varm luft er i ugens løb fra syd strømmet op langs USA's Østkyst, og det har fået New York'erne til at svede i en grad, de aldrig har oplevet så tidligt på året.

Varmen kulminerede onsdag, da temperaturen nåede op på hele 33,3° i Central Park i New York.

Det er den mest ekstreme varme, der har ramt New York så tidligt på året i mere end 140 år. Temperaturmålingerne fra Central Park går helt tilbage til 1869, og man skal tilbage til 1929 for at finde noget lignende, da man dengang den 7. april målte 31,7°.

April måneds varmerekord i New York var dog et stykke fra at falde. Den lyder fortsat på 35,6°, der er målt både i 1976 og i 2002. Det skete dog begge gange noget senere på måneden.

New York ligger på samme geografiske bredde som Madrid gør i Europa - og det kan blive hedt i USA's største by. Den absolutte varmerekord for New York er nemlig hele 41,1° målt den 9. juli 1936.

Several parts of North India are reeling under severe heat wave with mercury hovering over 40 degrees Celsius.

The national capital, continues to simmer under heatwave condition with the maximum temperature rising to 40 degree Celsius, 5 degree above the normal.

Talking to AIR, the Director of the Meteoroligical Department R.C. Vaishisht said, heat wave condition is likely to continue for the next 48 hours.

The temperature rose to 41 degree Celsius in Kolkata and its neighbourhood while the districts of Purulia, West Midnapore and Bankura remained in the grip of intense heat wave.

Jharsuguda in western Orissa recorded the highest temperature of 45 degree Celsius. Rajasthan also witnessed severe heat wave condition with Churu remaining the hottest place with the maximum of 43.3 degrees.

In Punjab and Haryana, the maximum rose by up to eight notches above normal with Hisar sizzling at 42.7 degrees.

AIR Correspondent reports that entire Maharashtra is in the grip of a heat wave with the mercury soaring up.

Load-shedding has further added to the woes of the people in the region comprising districts of Nashik, Jalgaon, Dhule, Nandurbar and Ahmednagar.

Day temperatures hovered between 40-43 degrees Celsius, making life difficult for the residents.

Wardha district in Maharashtra recorded highest temperature of 44. 9 degree Celsius yesterday, while Nagpur and Chandrapur remained equally hot with 44. 4 degree Celsius respectively.

Several areas in Maharashtra like Mumbai are also facing acute shortage of drinking water.

Some parts of Nashik district and Mumbai experienced light rains recently and weather too was cloudy. This was a relief for the people. But this relief was short live as heat wave overpowered these light showers.

The most up-to-date study of temperatures in India, from 1901 to 2007, has found that while it's getting warmer across regions and seasons, night temperatures have been rising significantly in almost all parts of the country.

The rise in night temperatures — 0.2 degrees Celsius per decade since 1970, according to the study — could have potentially adverse impact on yields of cereal crops like rice. The paper also finds that warming has been highest in post-monsoon and winter months (October to February).

''Until the late 1980s, minimum (or night) temperatures were trendless in India. India was an odd dot in the global map as most regions worldwide were seeing a rise in night temperatures in sync with growing levels of greenhouse gases. Our analysis shows the global trend has caught up with India,'' said K Krishna Kumar, senior scientist and programme manager at Indian Institute of Tropical Meteorology, Pune, and one of the authors.

Global Highlights

- The combined global land and ocean average surface temperature for March 2010 was the warmest on record at 13.5°C, which is 0.77°C above the 20th century average of 12.7°C. This was also the 34th consecutive March with global land and ocean temperatures above the 20th century average.

- The March worldwide land surface temperature was 1.36°C above the 20th century average of 5.0°C — the fourth warmest on record.

- The worldwide ocean surface temperature was 0.56°C above the 20th century average of 15.9°C and the warmest March on record.

- For the year-to-date, the global combined land and ocean surface temperature of 13.0°C was the fourth warmest January-March period. This value is 0.66°C above the 20th century average.

Mohenjo-daro, a ruined city in what is now Pakistan that contains the last traces of a 4,000-year-old civilisation that flourished on the banks of the river Indus, today entered the modern history books after government meteorologists recorded a temperature of 53.7C. Only Al 'Aziziyah, in Libya (57.8C in 1922), Death valley in California (56.7C in 1913) and Tirat Zvi in Israel (53.9C in 1942) are thought to have been hotter.

Dermed står det også klart, at vinteren 2009-2010 samt foråret 2010 ryger i rekordbøgerne som de globalt varmeste af slagsen, siden målingerne begyndte omkring 1850.

At kloden formår at sætte temperaturrekorder nu er bemærkelsesværdigt.

Huge floods in southern China have killed at least 132 people and displaced 800,000, the government said today as the annual storm season picked up ferocity.

More than 10 million people have lost property, been injured or suffered a cut in power or water supplies as a result of the week of torrential rain across Guangdong, Fujian, Guangxi, Jiangxi and Sichuan.

Many of these areas have gone from one extreme to another, according to the government. Earlier this year, south-east China endured its worst drought in living memory, but in the past week, some places have been inundated with three times the average rain for this period.

Southern China experiences flooding almost every summer, but the Beijing climate centre says extreme weather events have increased in recent years, with droughts becoming longer and rain falling in more intense and damaging bursts.

Jeg haaber at du som Dansker

There are two undeniable facts that underpin the science of climate change.

First, carbon dioxide is a greenhouse gas - it traps more heat than air. We saw the lab and handled the apparatus where this discovery was made 150 years ago.

Second, thanks to mankind's recent burning of coal, oil and gas, there is more CO2 in the earth's atmosphere, up from a pre-industrial level of 280 parts per million (ppm) to 379 ppm by 2005.

This is like the world putting on a thicker jumper - it means we retain more heat. When asked directly, or pinned to the "Wall of Certainty", no one we spoke to in making the programme disputed these two facts.

rick_uk skrev:
Det er et faktum at fleretallet af klimaforskere er enige i at menneskers udledning af drivhusgasser bærer hovedparten af skylden for de sidste 50 års opvarmning af kloden.

Folk har lov til at tror (ligesom dig) at det er fup og svindel det hele...at klimaforskere har lavet en verdensomspændende sammensværelse der opdigter forsknings resultater og fusker med temp. målinger.

Mht. klimaet bruger jeg selv ordet 'benægter' om dem som hævder at en (betydelig) stigning af atmosfærens drivhusgas indhold vil have ingen eller en ikke målbar effekt på jordens klima.

Hvis du søger efter 100% beviser anbefaler jeg at du holder dig til matematik!

rick_uk skrev:
BBC: After 'climate-gate': Dissecting the science



WIKI: List of scientists opposing the mainstream scientific assessment of global warming

Der er to ubestridelige kendsgerninger, som ligger til grund for videnskaben om klimaændringer.

Først kuldioxid er en drivhusgas - den fanger mere varme end luft. Vi så laboratoriet og håndteres af apparatet, hvor denne opdagelse blev gjort 150 år siden.

For det andet takket være menneskehedens nylige afbrænding af kul, olie og gas, er der mere CO2 i Jordens atmosfære, op fra en førindustrielle niveau på 280 ppm (ppm) til 379 ppm i 2005.