lab 4 orographic lifting, apparent temperature, satellite imagery, radar imagery, surface patterns...
TRANSCRIPT
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Lab 4
Orographic Lifting, Apparent Temperature, Satellite Imagery, Radar Imagery, Surface Patterns of Pressure and Wind, Constant Pressure Surfaces
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On labs and stuff…
Please read/answer the whole problem.
Use units.
Come to my office hours/ask me anything
Review for midterm: 10/1 7:30-8:30
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Orographic Lifting
● Orographic - of or related to mountains; associated or induced by the presence of mountains
● Orographic Lifting - lifting of air by terrain
● Clouds form when air rises
● Clouds disperse when air sinks
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Orographic Lifting
erh.noaa.gov
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Apparent Temperature
● What the temperature “feels like” to the average person if the effect of moisture content of the air is taken into account
● AKA “Heat Index,” AccuWeather’s “RealFeel”
● Apparent Temperature = Air Temperature + (Vapor Pressure -16)
● Find the Apparent Temperature:
○ T = 80°F, Td = 70°F
○ Equilibrium Vapor Pressure at 70°F is 25mb
○ Ta = 80 + (25-16) = 89°F
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Satellite Imagery - Visible
● Uses visible radiation from the sun back-scattered off objects on the earth
● Meteorologists are able to distinguish between different cloud types because of differences in albedo
● Thick clouds (i.e. Cumulonimbus) have higher albedo than thin, wispy clouds (Cirrus)
● Since it uses radiation from the sun, it’s only useful with daylight
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Satellite Imagery - Visible
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Satellite Imagery - Infrared
● Uses infrared radiation emitted by the earth and objects near the surface (i.e. clouds)
● Distinguish between high and low clouds based on temperature and the amount of radiation the cloud emits
● Useful day and night since objects always emit radiation
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Satellite Imagery - Infrared
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Satellite Imagery - Water Vapor
● Water vapor is the dominant emitter of infrared radiation around 6.7 microns
● Satellites are calibrated to measure this radiation so we can get a sense of water vapor in the atmosphere
● BUT...a radiometer attuned to radiation at wavelengths near 6.7 microns can only detect water vapor residing in the upper or middle regions of the troposphere
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Satellite Imagery - Water Vapor
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Radar Imagery
● RAdio Detection And Ranging
● Ground-based remote-sensing instruments
● First successfully used in World War II
● Radar works by transmitting pulses of radio waves from an antenna. The pulse is reflected off a “target,” such as a rain shower, and returns to the radar’s receiver giving us the size and distance of the target
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Radar Imagery
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Radar Imagery - Complication
Height of radar beam increases with distance from radar
Sometimes overshoots shallow clouds/precipitation
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Surface Patterns of Pressure and Wind
● 3 Forces that Control the Wind
○ Pressure Gradient Force (PGF)
○ Coriolis Force
○ Friction
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Pressure Gradient Force (PGF)
● The wind is caused by differences in air pressure
● Pressure Gradient Force - force that sets the air in motion in a determined effort to erase the pressure gradient
“THE WIND WILL BLOWFROM HIGH TO LOW”
-Mr. Anderson
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Coriolis Force/Coriolis Effect
● The force that deflects objects moving along the surface of the earth to the right in the northern hemisphere and to the left in the southern hemisphere
● Caused by the rotation of the earth
● CCW rotation around lows
● CW rotation around highs
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Friction
● The Earth’s surface is not smooth (mountains, hills, trees, buildings, etc.)
● Acts to slow wind speeds and reduce the effect of coriolis
Lake Erie Wx
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Correcting to Sea Level Pressure
● Air pressure decreases with increasing altitude
● What city has a higher surface pressure: Miami, FL or Denver, CO?
● We correct to sea-level pressure because it removes the effect of elevation
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Constant Pressure Surfaces (Heights)
● Surfaces (height) at which pressure is constant
● The same pressure does not occur at the same height everywhere, so these surfaces are not flat
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Heights and Temperature
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Lab 4
● 4.14(a,b)
● 4.15(c)
● 5.4(a,b,c)
● 5.10(a,b)
● 5.18
● 6.2(a,b)
● 6.7(a,b)
● 6.9(a,c,d)
● 7.9(a,b)