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Tópico em 'Climatologia' iniciado por Minho 23 Set 2007 às 19:38.
A Heinrich event is a natural phenomenon in which large armadas of icebergs break off from glaciers and traverse the North Atlantic. First described by marine geologist Hartmut Heinrich (Heinrich, H., 1988), they occurred during five of the last seven glacial periods or "ice ages" over the past 640,000 years (Hodell, et al., 2008). Heinrich events are particularly well documented for the last glacial period but notably absent from the penultimate glaciation (Obrochta et al., 2014). The icebergs contained rock mass, eroded by the glaciers, and as they melted, this material was dropped to the sea floor as ice rafted debris (abbreviated to "IRD").
The icebergs' melting caused extensive amounts of fresh water to be added to the North Atlantic. Such inputs of cold and fresh water may well have altered the density-driven, thermohaline circulation patterns of the ocean, and often coincide with indications of global climate fluctuations.
Various mechanisms have been proposed to explain the cause of Heinrich events, most of which imply instability of the massive Laurentide Ice Sheet, a continental glacier covering north eastern North America during the last glacial period. Other northern hemisphere ice sheets were potentially involved as well (Fennoscandic, Iceland/Greenland). However, the initial cause of this instability is still debated.
Record high temperatures cast gloom over festive season in Moscow
By Nathan Hodge, CNNUpdated 7:30 AM ET, Wed December 25, 2019
Moscow (CNN)Russia's capital has seen record high temperatures in December with snow not predicted until the end of the month. Moscow hit 6.2 degrees Celsius (43.2 degrees Fahrenheit) on Tuesday, the warmest recorded temperature for that date. The city is often blanketed with snow in December, but unseasonably warm temperatures have cast a gloomy pall over the streets decorated with festive lights for the New Year holiday. The unusually warm weather has prompted public discussion about the climate crisis, a subject that is not often a priority in a country that heavily depends on hydrocarbon exports.
Temos de investir em energias renovaveis o mais possivel! Eolica, das ondas, etc
Bolha quente" duas vezes maior que Península Ibérica aparece ao largo da Nova Zelândia
Hum que interessante, a temperatura mais alta registada em Moscovo para Dezembro é de 9.8ºC. Mesmo para Janeiro é de 8.6ºC
"A culpa não é das alterações climáticas, diz o mesmo especialista, lembrando que uma "bolha quente" semelhante tinha surgido em setembro no Mar de Bering, entre o Alasca e a Rússia, no hemisfério norte".
Tuesday, dia 24.
Este mês será certamente um dos mais quentes (ou menos frios) na história (recente, pelo menos) da Rússia.