| 18-08-2007 16:33 | Rekord smeltning af Arktis havis i 2007... |
rick_uk
(1121)
|
Ifølge National Snow and Ice Date Center, var 16. august 2007 dagen da dækningen af havis i arktis smeltet under den hidtil absolut minimum omfang siden satellit målinger begyndt først i 1970'erne.
Den forrige rekord var fra sept. 20.-21. 2005 og lyd på 5,320,000 km.2
http://nsidc.org/news/press/2007_seaiceminimum/images/20070817_timeseries.png
16. aug. 2007 var der 1,000,000 km2 mindre is sammenlignede med 16. aug. 2005.
Som regel fortsætte havis med at smelte indtil et tidspunkt i september, der er kommer derfor op til 4 ugers smeltning endnu. Den absolut minimum dækning af havis for 2007 er forventet at være betydelig mindre end de sidste 5 år hvor der har været rekord og næsten rekord smeltning hvert år...
Man kan selv følge med i situationen - opdateringer her:
"Arctic Sea Ice News Fall 2007"
http://nsidc.org/news/press/2007_seaiceminimum/20070810_index.html
Gå endelig ikke glip af FAQ's bl.a. "Why is Arctic sea ice so important?"
http://nsidc.org/news/press/2007_seaiceminimum/20070810_faq.html
http://nsidc.org/seaice/environment/global_climate.html
Vh rick
Vi har hørt varslerne. Klokken tikker....Informerede valg.
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| 18-08-2007 22:49 | |
GLAR
(1026)
|
Det er et stort dilemma!
Forskerne er bekymrede, men transportsektoren (søtransport) har svært ved at få hænderne ned. En åbning af Nordvest-passagen for søtransporten vil betyde besparelser i sværvægtsklassen.
Klima tips: Undgå sex i lukkede rum - du forgifter din partner med CO2
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| 19-08-2007 01:06 | |
Kosmos
(2603)
|
Bemærk, at polarhavets temperatur p.t. er usædvanligt høj (kig fx. her)
(Bemærk samtidigt klodens øvrige havtemperaturer!)
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| 19-08-2007 09:36 | |
rick_uk
(1121)
|
Flere forhold træffer sammen og giver rekord smeltning:
Why has the melt season progressed so quickly? The answer lies in a combination of high temperatures, changes in the age and thickness of ice, and fluctuations in atmospheric circulations.
Juni-juli: "Strong positive temperature anomalies occurred over much of the Arctic Ocean, accelerating ice melt, with the largest temperature anomalies (3 to 5 degrees Celsius) over the Siberian side where the largest ice losses have been observed. While 2007 was very warm, it is not the warmest year ever; 2004 showed stronger warm anomalies. However, the strength of the high-pressure anomaly, leading to clearer skies, is unusual for this time of year....Clear skies and warm temperatures in turn led to record-breaking rates of sea ice loss.
Taken together, the rapid sea ice losses that we've seen in June and July can partly be explained from the effects of this "triple whammy": it was warm; atmospheric circulation pushed ice away from the coast; and skies have been fairly clear.
However, what we are seeing also seems to reflect the "memory" of the ice to changes that have been occurring over the past couple of decades. In particular, there is mounting evidence of a shift from fairly thick ice to thinner ice, with this thinner ice more apt to completely melt out in summer. We'll address these issues in upcoming reports."
(kursiv mine)
Vh rick
Vi har hørt varslerne. Klokken tikker....Informerede valg.
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| 22-08-2007 22:18 | |
rick_uk
(1121)
|
Ny opdatering (22/8-07) fra NSIDC her:
http://nsidc.org/news/press/2007_seaiceminimum/20070810_index.html
Vh rick
Vi har hørt varslerne. Klokken tikker....Informerede valg.
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| 11-10-2007 01:29 | RE: "The time has come for drastic action" |
gorm
(78)
|
http://www.theage.com.au/news/opinion/the-time-has-come-for-drastic-action/2007/10/10/1191695988164.html
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