Chapter11a - Air Masses and Fronts – I Air Masses • A...

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Unformatted text preview: Air Masses and Fronts – I Air Masses • A large (thousands of kms) body of air with more or less uniform properties in any horizontal direction at any given latitude ♦ Temperature ♦ Humidity • Next time: fronts – the boundary between two different air masses Origin and formation of air masses • Source Region: the location where the air mass formed its properties ♦ Large, flat areas where the air stays stagnant long enough to take on the characteristics of the underlying surface. ♦ Ideal source regions are areas of high pressure • Types of sources. ♦ Tropical: warm ♦ Polar: cold ♦ Continental: dry ♦ Water (maritime): humid Classification of air masses • cP ♦ continental polar ♦ cold, dry, stable • cA ♦ continental arctic ♦ very cold, very dry, stable • mP ♦ maritime polar ♦ cool, moist, unstable • mT ♦ maritime tropical ♦ warm, moist, usually unstable • cT ♦ continental tropical ♦ hot, dry, unstable surface air Stability of air masses • Which is lighter? ♦ Dry air ♦ Moist air • Dry air: ♦ Nitrogen ♦ Oxygen ♦ Argon • Moist air: all this plus ♦ H 2 O The weight of humid air • Mean molecular mass of dry air: • Mean molecular mass of wet air. gas m % mass of the gas mixture-------------------------------------------- N 2 28 78% 28x78/100+32x21/100= 28.6 O 2 32 21% gas m % mass of the gas mixture--------------------------------------------- Dry air 28.6 90% 28.6x90/100+18x10/100= 27.5 H 2 O 18 10% Air mass source regions and their paths...
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Chapter11a - Air Masses and Fronts – I Air Masses • A...

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