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on September 18th satellites observed
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that Arctic sea ice had reached its
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annual low this year's sea ice minimum
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is effectively tied for the second
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lowest on record and while sea ice grows
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and shrinks with the seasons 2019
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continues the downward trend of the
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extent the trends that we've been seeing
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with the sea ice minimum have just been
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a decrease so in the 70s since the
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modern record began tracking to today
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there's there's variation from year to
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year but it's really just a downward
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trend satellite observations show that
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Arctic sea ice is not only shrinking an
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extent it is also becoming younger and
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thinner that means less and less ice
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survives the annual melt the the Arctic
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is actually warmed a lot more than the
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the globe as a whole there's a something
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called article efficient which means
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that the the temperatures in the Arctic
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have warmed about two to three times the
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global average a major cause of this
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warming is due to the loss of
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reflectivity or albedo of the sea ice
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snow-covered sea ice has a high albedo
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this keeps the sun's energy from being
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absorbed by a dark ocean but when sea
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ice begins to melt it loses some of that
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reflectivity and without the sea ice
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cover the ocean will absorb most of the
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sun's energy this creates a feedback
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loop that leads to more melting and
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warming in the Arctic we care about sea
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ice for a variety of reasons one being
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because it does have an impact on things
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like our weather and our climate because
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of the albedo effect if you decrease the
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amount of Arctic sea ice you start
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warming up the Arctic and when you start
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warming up the Arctic you can start
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changing the circulation of the the jet
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stream which brings weather to us here
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in the mid-latitudes the other other
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reasons why we care about sea ice Arctic
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sea ice in particular is because we've
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seen such big changes due to warming
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melting ice it's a good visual to show
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that yes the climate is changing
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and it's because of warning NASA
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continues to monitor these changes to
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the Arctic so that we may get a better
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understanding of what we can expect in
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the future
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