18 Questions
What does water sky refer to?
Dark spots on low clouds indicating open water below
In what conditions is the indication of water sky less evident?
When the air is clear
What does the absence of iceblink in some sectors of the horizon at night suggest?
Presence of open water
How does dark spots in fog differ from water sky as an indicator?
They are not visible for as great a distance as water sky
What does a dark bank on a high altitude cloud suggest according to the text?
Indication of open water below
Why is close-range detection of ice hazards considered important according to the text?
To locate small icebergs and old ice floes
What percentage of open water is present in August?
10%
What does the sound of sea breaking or thunderous sounds indicate when heard far from land?
Presence of icebergs
Which ice thickness category shows the most significant seasonal change between December and March?
0 - 0.2 m
How do icebergs appear during the daytime in fog?
Luminous white mass
At night, on a clear moonless night, how far away can icebergs be visible?
1 to 2 miles
Why does the amount of ice greater than 1.0 m show very little seasonal variability?
Because undeformed ice rarely exceeds 1 m thick
What is an indication of sea ice presence under clear daylight conditions?
Yellowish haze
What is 'ice blink' considered as when detecting ice in open waters?
Fairly reliable sign of ice field nearby
How can the presence of ice be inferred when the swell starts to lessen or the sea quickly smoothens?
Ice to windward
Where can comprehensive information on ice for OOW be found?
'Mariners handbook', Chapter 7 'Ice'
What is an indication of an iceberg located to windward when far from land?
Growlers and smaller pieces of ice
What is the purpose of the 'Ice Glossary' mentioned?
Provides definitions of terms used to describe ice
Explore the seasonal changes in Arctic sea ice extent and thickness, with a focus on the variations between different ice thickness categories. Learn about the factors that influence the amount of open water and thickness of ice throughout the year.
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