Anticyclones Flashcards

0
Q

Mid latitude continents: winter

A

Land chills quickly, leads to high pressure.

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1
Q

Mid latitude continents: summer

A

Land heats up quickly, leads to a fall in pressure.

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2
Q

Continental anticyclones: (5)

A
Sinking motion, very cold air at surface. 
Little cloud. 
Air is dry; far from moisture. 
Seasonal; winter. 
Occur still higher latitudes.
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3
Q

Continental anticyclones: Autumn (2)

A

Vertical rate of pressure change is rapid because the lowest 2km of the troposphere is so cold.

Intense cooling begins; increase in air density; start of shallow anticyclone.

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4
Q

Continental anticyclones: Winter

A

Strong radiative cooling to space.

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5
Q

Subtropical anticyclones: seasonal variation

A

Winter - tend to be at lower latitudes than in summer.

Summer - higher latitudes; more intense.

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6
Q

Subtropical anticyclones: occur at around

A

30’ N/S

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7
Q

Subtropical anticyclones: air is sinking from

A

Upper to lower levels; subsidence.

Air spirals out into lower levels.

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8
Q

Subtropical anticyclones: lowest 1 km of atmosphere

A

Over the oceans is rich in moisture.

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9
Q

Subtropical anticyclones: weather conditions (3)

A

Dry weather.
Low relative humidity.
Cloudy - shallow stratiform cloud.

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10
Q

Subtropical anticyclones: semi permanent high over

A

Subtropical pacific and N Atlantic Ocean (Azores high) w

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11
Q

Subtropical anticyclones: source regions for air masses; (2)

A

Deep subsiding motion.

Dry air is sinking into higher pressure, warming at the DALR of 9.8 ‘C km-1

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12
Q

Subtropical anticyclones: Dry air sinks, warming adiabatically; (3)

A

Relative humidity decreases simultaneously.
Dry bulb temperature increases rapidly.
Absolute humidity remains the same, but saturation value increases as DB temp rises.

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