Citat:
Ursprungligen postat av Quantilho
Bra. En ordentlig källa för en gångs skull. Och som andra funnit tidigare har Antarktis och Arktis stundtals varit rena rama tropikerna tidigare i historien så det är ju på inget sätt onaturligt att dessa områden smälter.
Här finns en Science-artikel som menar att isen på Antarktis shelfområden endast är omkring 2000 år via sedimentanalyser. Så redogör nu man kan vara säker på att Antarktis smälter till följd av mänsklig aktivitet och inte naturliga.
Återigen bara en katastroflista. Jag vill se material som visar att naturen ändrats och inte samhället. Översvämningar kan ju lätt härledas till mer strandnära tomter och annan åverkan på floderna. Skaka fram historiska jämförelser så vi kan kika på hur dagens situation står sig mot den historiska. Har man ingenting vettigt att jämföra med så är det ju poänglöst att tala om trender. Jag postade ju tidigare en studie som visar att dagens orkanfrekvens i Atlanten är mer "normal" eftersom det ligger mer på medelvärdet för de 270 undersökta åren.
Sedan var det ju ett löjligt kort tidsintervall man hade. Från 2007 tillbaka till 2003. Lite väl kort för att studera historiska trender. Tycker du inte det?
Här är en annan artiklen att läsa igenom från Amerikanska Metereologrörelsens tidsskrift Journal of Climate (flera av dem arbetar åt NOAA också!). September 2006-numret innehöll nämligen nya rön som motsäger den gemena tesen om att hela Himalayas glaciärer håller på att smälta bort:
Glaciärerna i Östra Himalaya växer! Säg till om den inte fungerar så lägger jag upp artikeln som pdf på annat ställe.
Jag kom inte åt pdf dokumentet så du får gärna lägga ut en länk till det sen.
Först hittade jag det här, och det är ganska färskt.
Himalayan Glacier Melting Observed From Space
Science Daily — The Himalaya, the "Roof of the World", source of the seven largest rivers of Asia are, like other mountain chains, suffering the effects of global warming. To assess the extent of melting of its 33 000 km2 of glaciers, scientists have been using a process they have been pioneering for some years.
Satellite-imagery derived glacier surface topographies obtained at intervals of a few years were adjusted and compared. Calculations indicated that 915 km2 of Himalayan glaciers of the test region, Spiti/Lahaul (Himachal Pradesh, India) thinned by an annual average of 0.85 m between 1999 and 2004. The technique is still experimental, but it has been validated in the Alps and could prove highly effective for watching over all the Himalayan glacier systems. However, the procedure for achieving a reliable estimate must overcome a number of sources of error and approximation inherent in satellite-based observations.
Sen det
här.
Why some Himalayan glacies aren't melting due to climate change Mountain climate change trends could predict water resources Newcastle University
"Brown Clouds" Contribute to Himalaya Glacier Melt
Soot-filled "brown clouds" over the Indian subcontinent warm the lower atmosphere just as much as greenhouse gases do, a recent study reports.
Such clouds contain aerosols—tiny particles suspended in the air that are known to create a general cooling effect that could mitigate global warming.
Använd länken före resten av artikeln.
Early 2007 saw
record-breaking extreme weather: U.N.
GENEVA (Reuters) - The world experienced a series of record-breaking weather events in early 2007, from flooding in Asia to heatwaves in Europe and snowfall in South Africa, the United Nations weather agency said on Tuesday.
The World Meteorological Organization (WMO) said global land surface temperatures in January and April were likely the warmest since records began in 1880, at more than 1 degree Celsius higher than average for those months. There have also been severe monsoon floods across South Asia, abnormally heavy rains in northern Europe, China, Sudan, Mozambique and Uruguay, extreme heatwaves in southeastern Europe and Russia, and unusual snowfall in South Africa and South America this year, the WMO said.
"The start of the year 2007 was a very active period in terms of extreme weather events," Omar Baddour of the agency's World Climate Program told journalists in Geneva. While most scientists believe extreme weather events will be more frequent as heat-trapping carbon dioxide emissions cause global temperatures to rise, Baddour said it was impossible to say with certainty what the second half of 2007 will bring.
Europe heating up faster than expected: study
LONDON: Western Europe, over the past century, has heated up more than previously thought, according to a new study that adds to evidence pointing to a future of hotter summers and longer-lasting heat waves.
The study, published on Friday in the Journal of Geophysical Research-Atmospheres, showed that the actual mean temperature since 1880 had risen 1.6 degrees Celsius, not the 1.3 degrees as previously thought, said Paul Della-Marta, a climate scientist at Switzerland’s national weather service who led the study. “It is a big change when you consider it is an average temperature,” Della-Marta said.
The reason why previous estimates were too low was because, before 1930, most temperatures were measured without the type of screens that are now used to block radiation from the sun and ground that can skew a reading, he said. The study’s findings may provide further evidence that heat waves like the one that killed dozens this summer in Europe were a sign of global warming. “It could be used as more evidence that temperatures are rising and we may be underestimating impacts of human activity,” he said.
Mer att läsa om du använder länken. Det är en sån där jobbig länk som du får kopiera och klistra in i adressfältet i webbläsaren. Glöm det, den verkar funka på Flashback, i mitt forum funkade den inte.
http://www.dailytimes.com.pk/default.asp?page=2007\08\04\story_4-8-2007_pg7_63
European heat waves double in length since 1880
The most accurate measures of European daily temperatures ever indicate that the length of heat waves on the continent has doubled and the frequency of extremely hot days has nearly tripled in the past century.
The new data shows that many previous assessments of daily summer temperature change underestimated heat wave events in western Europe by approximately 30 percent.
Mer
här
(finns länk till AGU längst ned på sidan)
Jag återkommer sen med mer vetenskaplig fakta och mindre från tidningar, det tar lite tid att samla ihop först.