SD Dojavi
OSMRTNICE
PRETPLATA
PREMIUM
stdClass Object ( [id] => 47563 [title] => Znanstvenici upozoravaju: Arktički led sve je tanji [alias] => znanstvenici-upozoravaju-arkticki-led-sve-je-tanji [catid] => 264 [published] => 1 [introtext] => [fulltext] =>

Arktički led, važna komponenta prirodnog termostata planeta Zemlje, sve je tanji, a površina ledene kape oko Sjevernog pola kontinuirano se smanjuje posljednjih godina, objavili su znanstvenici pozivajući se na satelitske snimke.

Tanji sezonski led, koji se na površini mora stvara svake zime a topi svakog ljeta, sada čini oko 70 posto ukupnog arktičkog leda, dok je osamdesetih i devedesetih godina takav led sačinjavao 40 do 50 posto ledenog pokrova Arktika.

Istodobno se znatno smanjuje površina debljeg leda koji može jednu ili više godina "preživjeti" ljetne temperature, navode znanstvenici američke NASA-e.

Smanjenje količine leda koje je posljedica globalnog zagrijavanja izaziva veliku zabrinutost jer ledeni pokrov reflektira sunčevu svjetlost u svemir i služi kao golemi klimatski uređaj planeta Zemlje.

Otopljeni led zamjenjuju tamnije oceanske vode koje apsorbiraju puno više sunčeve svjetlosti i time pridonose dodatnom zagrijavanju planeta.

- Ledeni pokrov igra važnu ulogu u klimatskim promjenama - rekao je Thomas Wagner iz NASA-e.

- Osobito je važan deblji led jer se on ne topi pa i ljeti reflektira svjetlost - dodao je Wagner.

Desetljetni trend smanjivanja površine ledene kape na Sjevernom polu također se nastavlja. Tijekom zime 2008./2009. najveća zabilježena površina ledenog pokrova iznosila je 15,2 milijuna četvornih kilometara, što je 720 tisuća četvornih kilometara manje od dugogodišnjeg prosjeka između 1979. i 2000.

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Arktički led, važna komponenta prirodnog termostata planeta Zemlje, sve je tanji, a površina ledene kape oko Sjevernog pola kontinuirano se smanjuje posljednjih godina, objavili su znanstvenici pozivajući se na satelitske snimke.

Tanji sezonski led, koji se na površini mora stvara svake zime a topi svakog ljeta, sada čini oko 70 posto ukupnog arktičkog leda, dok je osamdesetih i devedesetih godina takav led sačinjavao 40 do 50 posto ledenog pokrova Arktika.

Istodobno se znatno smanjuje površina debljeg leda koji može jednu ili više godina "preživjeti" ljetne temperature, navode znanstvenici američke NASA-e.

Smanjenje količine leda koje je posljedica globalnog zagrijavanja izaziva veliku zabrinutost jer ledeni pokrov reflektira sunčevu svjetlost u svemir i služi kao golemi klimatski uređaj planeta Zemlje.

Otopljeni led zamjenjuju tamnije oceanske vode koje apsorbiraju puno više sunčeve svjetlosti i time pridonose dodatnom zagrijavanju planeta.

- Ledeni pokrov igra važnu ulogu u klimatskim promjenama - rekao je Thomas Wagner iz NASA-e.

- Osobito je važan deblji led jer se on ne topi pa i ljeti reflektira svjetlost - dodao je Wagner.

Desetljetni trend smanjivanja površine ledene kape na Sjevernom polu također se nastavlja. Tijekom zime 2008./2009. najveća zabilježena površina ledenog pokrova iznosila je 15,2 milijuna četvornih kilometara, što je 720 tisuća četvornih kilometara manje od dugogodišnjeg prosjeka između 1979. i 2000.

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Život

Znanstvenici upozoravaju: Arktički led sve je tanji

Piše PSD.
7. travnja 2009. - 19:07

Arktički led, važna komponenta prirodnog termostata planeta Zemlje, sve je tanji, a površina ledene kape oko Sjevernog pola kontinuirano se smanjuje posljednjih godina, objavili su znanstvenici pozivajući se na satelitske snimke.

#ARKTIK#GLOBALNOZATOPLJENJE
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