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Arctic Sea Ice Seasonal Variability

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Questions and Answers

What does water sky refer to?

Dark banks on high altitude clouds signaling ice hazards

Reflective spots on clouds suggesting fog ahead

Dark spots on low clouds indicating open water below (correct)

Bright patches on low clouds indicating presence of icebergs

In what conditions is the indication of water sky less evident?

When the clouds are very low

When the air is clear (correct)

During the day

During periods of poor visibility

What does the absence of iceblink in some sectors of the horizon at night suggest?

Visibility of ice hazards

Presence of open water (correct)

Approaching fog

Thick ice cover

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 Signup and view all the answers

What does a dark bank on a high altitude cloud suggest according to the text?

Indication of open water below Signup and view all the answers

Why is close-range detection of ice hazards considered important according to the text?

To locate small icebergs and old ice floes Signup and view all the answers

What percentage of open water is present in August?

10% Signup and view all the answers

What does the sound of sea breaking or thunderous sounds indicate when heard far from land?

Presence of icebergs Signup and view all the answers

Which ice thickness category shows the most significant seasonal change between December and March?

0 - 0.2 m Signup and view all the answers

How do icebergs appear during the daytime in fog?

Luminous white mass Signup and view all the answers

At night, on a clear moonless night, how far away can icebergs be visible?

1 to 2 miles Signup and view all the answers

Why does the amount of ice greater than 1.0 m show very little seasonal variability?

Because undeformed ice rarely exceeds 1 m thick Signup and view all the answers

What is an indication of sea ice presence under clear daylight conditions?

Yellowish haze Signup and view all the answers

What is 'ice blink' considered as when detecting ice in open waters?

Fairly reliable sign of ice field nearby Signup and view all the answers

How can the presence of ice be inferred when the swell starts to lessen or the sea quickly smoothens?

Ice to windward Signup and view all the answers

Where can comprehensive information on ice for OOW be found?

'Mariners handbook', Chapter 7 'Ice' Signup and view all the answers

What is an indication of an iceberg located to windward when far from land?

Growlers and smaller pieces of ice Signup and view all the answers

What is the purpose of the 'Ice Glossary' mentioned?

Provides definitions of terms used to describe ice Signup and view all the answers