IJsafsmelt en energie
Geplaatst: vr 13 dec 2013, 20:01
"It takes energy to melt sea ice. How much energy? The energy required to melt the 16,400 Km3 of ice that are lost every year (1979-2010 average) from April to September as part of the natural annual cycle is about 5 x 1021 Joules. For comparison, the U.S. Energy consumption for 2009 (www.eia.gov/totalenergy) was about 1 x 1020 J. So it takes about the 50 times the annual U.S. energy consumption to melt this much ice every year. This energy comes from the change in the distribution of solar radiation as the earth rotates around the sun.
To melt the additional 280 km3 of sea ice, the amount we have have been losing on an annual basis based on PIOMAS calculations, it takes roughly 8.6 x 1019 J or 86% of U.S. energy consumption.
However, when spread over the area covered by Arctic sea ice, the additional energy required to melt this much sea ice is actually quite small. It corresponds to about 0.4 Wm-2 . ThatÂ’s like leaving a very small and dim flashlight bulb continuously burning on every square meter of ice. Tracking down such a small difference in energy is very difficult, and underscores why we need to look at longer time series and consider the uncertainties in our measurements and calculations".
http://psc.apl.washington.edu/wordpress ... e-anomaly/
Heb een vraag over de bovenstaande tekst.
Daarin staat dat ijsafsmelt energie kost. Mijn vraag: komt er bij het bevriezen van zee-ijs weer precies evenveel energie vrij als er bv 17000 km3 smelt en het volgende winterseizoen weer 17000 km3 ijs bijkomt? Zijn die hoeveelheden energie exact hetzelfde bij bevriezen en afsmelt?
To melt the additional 280 km3 of sea ice, the amount we have have been losing on an annual basis based on PIOMAS calculations, it takes roughly 8.6 x 1019 J or 86% of U.S. energy consumption.
However, when spread over the area covered by Arctic sea ice, the additional energy required to melt this much sea ice is actually quite small. It corresponds to about 0.4 Wm-2 . ThatÂ’s like leaving a very small and dim flashlight bulb continuously burning on every square meter of ice. Tracking down such a small difference in energy is very difficult, and underscores why we need to look at longer time series and consider the uncertainties in our measurements and calculations".
http://psc.apl.washington.edu/wordpress ... e-anomaly/
Heb een vraag over de bovenstaande tekst.
Daarin staat dat ijsafsmelt energie kost. Mijn vraag: komt er bij het bevriezen van zee-ijs weer precies evenveel energie vrij als er bv 17000 km3 smelt en het volgende winterseizoen weer 17000 km3 ijs bijkomt? Zijn die hoeveelheden energie exact hetzelfde bij bevriezen en afsmelt?
