Yearly Freeze and Melt Cycle
Sea ice freezes and melts due to a combination of factors, including the age of the ice, air temperatures, and solar insolation. During the winter the area of the Arctic Ocean covered by sea ice increases, usually reaching a maximum extent during the month of March. The area covered in sea ice then decreases, reaching its minimum extent in September most years. First-year ice melts more easily than older ice for two reasons: 1) First-year ice is thinner than older ice, since the process of congelation growth has had less time to operate; and 2) first-year ice is less permeable than older ice, so summer meltwater tends to form deeper ponds on the first-year ice surface than on older ice, and deeper ponds mean lower albedo and thus greater solar energy capture.
Read more about this topic: Sea Ice
Famous quotes containing the words yearly, freeze, melt and/or cycle:
“What is last year’s snow to me,
Last year’s anything? The tree
Budding yearly must forget
How its past arose or set—”
—Countee Cullen (1903–1946)
“But that I am forbid
To tell the secrets of my prison-house,
I could a tale unfold whose lightest word
Would harrow up thy soul, freeze thy young blood.”
—William Shakespeare (1564–1616)
“I wish to speak with all respect of persons, but sometimes I must pinch myself to keep awake, and preserve the due decorum. They melt so fast into each other, that they are like grass and trees, and it needs an effort to treat them as individuals.”
—Ralph Waldo Emerson (1803–1882)
“The cycle of the machine is now coming to an end. Man has learned much in the hard discipline and the shrewd, unflinching grasp of practical possibilities that the machine has provided in the last three centuries: but we can no more continue to live in the world of the machine than we could live successfully on the barren surface of the moon.”
—Lewis Mumford (1895–1990)