Climate Change

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28 Terms

1
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Define climate

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Describe the climate of the UK

Temperate climate which is found between 40 and 60 degrees N + S of equator

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When was the Quaternary period?

2.6 million years ago

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Why might some people believe climate change not to be a threat?

The Earth experiences patterns of warming + cooling called glacial and interglacial periods

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How much has the earths temp increased from 1880

1.2 degrees

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How do ice cores work?

Drill into ice + extract ice that is 1000s of years old and analyse water molecules to calculate past temperatures

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Adv of ice cores

Adv - Can create graphs of temp. changes. over 400k years Objective evidence

8
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Describe an example of sea ice positions

Columbia glacier retreating at a rate of 30m a day, has lost half of its thickness

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Reliability of sea ice positions GOOD

Globally distributed, is happening everywhere. Objective evidence, can see retreat.

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Reliability of sea ice positions BAD

Partly due to ocean currents, not climate change.

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How is global temp data useful?

Objective, uses computer programming, 1000 ground weather stations, satellites, sparse distribution of weather stations

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How can we use fossil evidence?

Discovery of warm animals in cold places indicate climate change in past.

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Adv and disadv of sediment evidence

adv - can use oxygen isotopes to calculate past temp disadv - only shows there was a cold period not how long it lasted

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Name the 3 milankovtich cycles

precession, eccentricity + axial

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How long do the milankovitch cycles take?

eccentricity - 100,000 years precession - 26k axial tilt - varies between 21 and 24 degrees

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What are sunspots?

Dark patches on suns surface linked to occurrence of solar flares. Increases to max + minim.

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How do volcanoes affect climate?

Eruption of ash + sulphur dioxide into atm. Ash blocks out sun, cools earth. Sulphur dioxide converts into sulphuric acid which can block out radiation from atm

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What type of radiation is heat?

Short wave solar radiation

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What type of radiation is released by Earths surface?

Long wave radiation

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What % of emissions are caused by burning fossil fuels?

57%

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Name 2 social threats in UK

Heatwaves cause elderly death, water shortage

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Name 2 economic threats in UK

1 million properties damage at a 12 billion flood risk, roads + rail need maintenance

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Name 2 environmental threats in UK

Erosion of salt marshes due to cliff collapse, droughts

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Name social threats worldwide

Kiribati + Maldives at risk of submersion as Maldives 1.3m above sea level. Mumbai at risk of flooding, pop. 20 million

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Name environmental impacts worldwide

60% of GBR coral bleached, Russia is warming 2.5x faster than avg and contains huge arctic regions + permafrost

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