albedo_e en ingles

8/23/2019 Albedo_e en Ingles

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Increase Your Albedo!

Exploring the Fate

of Arctic Sea Ice


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What is Albedo?

Albedo is the fraction of solar radiation

incident on a surface that is reflected.

In plain terms, albedo is the ability of a

surface to reflect the suns radiation. Your

white t-shirt has a higher albedo than your

darker ones thats why it keeps you coolin the summer!


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Pop Quiz!

Guess which terrestrial surface type has the

most albedo (reflects more sunlight than

it absorbs).

Albedo is expressed as a percentage of

reflected radiation (0.1 or 10%)


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Pop Quiz


5/22

The Big Picture

The Earth as a whole

reflects about 30% of

incoming solarradiation back into

space

Clouds and snow/ice

each have an albedo ofroughly 80%

NASA


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So What?

Clouds and ice are

basically the

thermostats of theplanet

Theyre regulating the

temperature of the

Earth by reflectingmuch of the solar

radiation it receives CASES


7/22

Whats Going On?

The United Nations Intergovernmental

Panel on Climate Change (IPCC) has

made some startling observations:Arctic sea-ice extent has decreased by 3% per decade between 1978-1996

Summer sea-ice extent has shrunk by 20% (880,000 sq. km) in the

Atlantic part of the Arctic OceanArctic air temperature has risen by as much as 5C during the 20th

century with the last decade being the warmest

There is consistent evidence of later Fall freeze-up and earlier Spring

breakup


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Whats Next?

Loss of sea ice (80%albedo) gives way to water(3-5% albedo)!

This net loss of albedoresults in further heatabsorption at Earthssurface, resulting in moresea ice melting, resulting

in more warming

Its a positive feedbackloop!

CASES


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10/22

Whats CASES?

The Canadian Arctic Shelf Exchange Study

A Canadian-led international research networkmade up more than 70 researchers from Canada

and 9 other countries Goal: Understand and model the response of

biogeochemical and ecological cycles toatmospheric, oceanic and continental forcing of

sea-ice cover variability on the Mackenzie Shelf In simpler terms: Study the effects of changing

sea-ice cover on the Arctic environment!


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Mackenzie Shelf


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The Amundsen

Inauguration: August 26, 2003 in Qubec City Named after Norwegian explorer Roald Amundsen: 1st to

navigate Northwest Passage from 1903-1906 and to reachthe South Pole in 1911

Only Canadian ship to have full-time dual role of

icebreaking and scientific research


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The Amundsen


14/22

Large-scale density-driven circulation in the oceans, driven bydifferences in temperature and salinity. Cold salty water sinks and

warmer water rises.


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Maximum and Minimum Ice

Minimum in Fall(September)

Maximum in Spring(March)

Ice no longer extendsas far and now retreats

further Whats in store for the

future?

CASES


16/22

Present and Future Ice Cover

March SeptemberMarch September

Today 2050 CASES


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Whats in Store for Nanook?

Ice freezes later and

melts sooner: Less

feeding time Seals fewer and

farther out: Longer

distance to feed

More open water:

Fatigue from

swimming

NFB-ONF


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The Northwest Passage

CASES


19/22

Passage Pioneers

Roald Amundsen, August1905, first successfulnavigation. Aboard theGjoa (Oslo-Pacific).

St-Roch, 1944, NorthernDeep-Water Route.

Sedna IV, August-

November 2002, sailedfrom Magdalen Island toVancouver.

Whats next?

CASES


20/22

Oslo to Tokyo

Total travel distance for a one-way trip from Norway toJapan:

Via Panama Canal: 24 000 km

Via Cape Horn: 35 000 km Via Suez Canal (Asian Route): 21 500 km

Via Northwest Passage: 14 500 km


21/22

Activity

We will be drawing the most efficient (and

realistic) route between the southern tip of

Greenland to the Bering Strait!1. Groups of 4 (or more).

2. You will need: String, Adhesive, Ruler.

3. Try to draw your own way across the Northwest

Passage by navigating the shortest distance.

4. Good Luck!


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Discussion

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