Sun Jan 6, 2013, 12:48 PM
Submariner (7,937 posts)
Black iceberg photo
Last edited Tue Jan 8, 2013, 03:57 PM - Edit history (1)
It's not everyday (or ever) you see a black iceberg. So when one witness snapped a flick of such rarity, the post went bonkers on Reddit.
CBS News reports the photo was posted by user Rundboll on Friday (Jan. 4), receiving over 1,000 comments and featured on the front page.
According to The Canada Encyclopedia, the odd-colored iceberg is a result of density differences.
“Others may appear green, brown or black, or combinations of these colors. These icebergs have usually rolled over, exposing basal ice, or have emerged from below water level. The various colorations are caused by differences in density, air-bubble content and impurities. For example, black ice is of high density and bubble free; dark layers indicate the presence of rock materials derived from the base of the parent glacier. Occasionally, rocks may be found on the original upper surface of the iceberg. As the iceberg melts, these materials precipitate into marine or lake sediments.”
24 replies, 7136 views
Black iceberg photo (Original post)
|Historic NY||Jan 2013||#2|
|D Gary Grady||Jan 2013||#10|
|Aldo Leopold||Jan 2013||#20|
|Solly Mack||Jan 2013||#23|
Response to FirstLight (Reply #6)
Sun Jan 6, 2013, 04:02 PM
D Gary Grady (50 posts)
10. Icebergs break off of glaciers
Icebergs aren't formed in the deep ocean but are rather "calved" off of glaciers as they slowly slide from land into the sea at the coast.
Response to patrice (Reply #9)
Sun Jan 6, 2013, 04:11 PM
morningfog (10,756 posts)
11. That was my thought. I am no expert, but I wonder if the reason we never see these is
because this type of melt due to climate change has never occurred before.
Response to morningfog (Reply #11)
Sun Jan 6, 2013, 11:05 PM
jeff47 (16,271 posts)
15. Glaciers have always flowed
As a result, the bottom of glaciers have always broken off as they fall into the sea (or other body of water)
If it was a new phenomenon, we wouldn't already know it was caused by density, air content and minerals. We'd have just started studying these weird new glaciers.
Response to Submariner (Original post)
Mon Jan 7, 2013, 11:59 AM
Mac1949 (368 posts)
16. This is what (then) Second Officer Lightoller testified was struck by the Titanic.
He was not on the bridge at the time (he was off duty), but he always said that he was convinced it was a berg that had rolled over, exposing the dark ice of it's underside, and that's why it wasn't spotted early enough to take effective action.