Weather: Temperature & Moisture
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1 Weather: Temperature & Moisture
2 Weather and the Earth s Heat Balance Weather = motion in the atmosphere due to unequal heating Over time, the amount of energy lost and received by the atmosphere must be in balance But, the atmosphere is not in balance Attempt to regain balance disturbance weather
3 Components of Weather Temperature & Moisture Atmospheric Stability Winds Masses & Fronts Clouds & T-Storms
4 SURFACE HEAT EXCHANGE Solar radiation: heats air directly F/day (depending on water vapor) Conduction: Air heated (or cooled) through contact with Earth s surface Convection: warm air rises, cooler air falls (mixing) Cooling at night: Radiation, conduction, convection DAY NIGHT
5 Rising air expands and cools. Sinking air is compressed & warmed Air Rising Air Falling
6 Factors affecting the Earth s surface temperature Season angle of sun, day length Topography slope, aspect Shading/scattering clouds, smoke, haze, vegetation Absorption clouds, water vapor Surface properties
7 Effect of vegetation on air temperatures (moderating influence) Intercepts radiation Green foliage greater reflection Type of vegetation shrub, tree, grass Density (canopy cover) * Temperatures in forest = 5-8 F cooler than open areas (warmer during the night)
8 Effect of vegetation on air temperatures Openings = warm pockets (chimney effect)
9 Effects of surface properties on temperature Absorption and reflection: dark vs. light Dark materials absorb more radiation Light materials reflect radiation Transparent vs. opaque materials Transparent materials allow radiation penetrate deeper layers (water) Opaque materials concentrate radiation at the surface (soil, litter)
10 Surface properties continued Conductivity Good conductors transmit heat rapidly to the interior wood/litter metal air water soil Dry vs. wet soils? Compact soil vs. porous duff? Poor conductors = hotter during the day and cooler at night (example dry wood with frost) Good conductors = moderating influence, less temperature change (example lake water)
11 Surface properties continued Heat capacity - definition The capacity of a material to contain, hold, or absorb heat The amount of heat required to raise the temperature Water VS. soil, rocks, wood, litter Water has higher HC (and good conductor, high transparency) Water requires large amounts of heat to raise its temperature; but loses and gains heat slowly Soil, rocks, wood, litter: Low HC
12 How does heating and cooling differ between these materials? Vegetation high reflectance Dark surfaces high absorption Water high conductance high heat capacity high transparency (heat transferred to deep er layers) Dark dry soil low conductance, (opaque) high absorption, low heat capacity opaque (concentrates heat near surface) Air low conductivity Metal high conductivity
13 Moisture & Weather Moisture in the atmosphere is continually changing its physical state: Solid Liquid Gas (ice) (water) (vapor) Heat Energy Required (Melting, Evaporation) = cooling Heat Energy Released (Condensation, Freezing) = warming
14 Atmospheric Humidity Absolute humidity: The amount of water vapor in a given volume of air Relative humidity: The ratio of the amount of water in a volume of air to the total amount of which that volume can hold at a given temperature and atmospheric pressure. = actual amount of water x 100 total amount the air can hold * RH VARIES WITH TEMPERATURE!!! *** Warm air can hold more water
15 Homework - Select a recently or currently burning fire Name & location How did it start? Fuel type? Topography? Fire behavior? Weather conditions (RH/TEMP see outcome sheet) Find the hourly temperature, dew point, and relative humidity for 6:00 am midnight on September 2 nd, 2008 for that site.
16 Relationship between temperature and relative humidity
17 Saturation and Dew Point Saturation when the air contains all the water vapor that it can hold Dew point The temperature to which air must be cooled to reach its saturation point Further cooling will cause condensation to occur (clouds, fog, dew) For an air mass with a given amount of water content, dew point remains the same even if temperature changes
18 Psychrometer Instrument used to measure atmospheric moisture 2 thermometers: Dry bulb measures air temperature Web bulb measures temperature of evaporating water from a muslin wicking clot Use tables to determine: Dew-point temperature RH
19 Dew point = Top number (red) RH = Bottom number (black)
20 Psychrometer: Examples Example 1: Dry Bulb = 80 F; Wet bulb = 70 DP =?; RH =? DP = 65; RH = 61% Example 2: AM: temperature = 70 F & RH = 60% PM: temperature = 90 F & RH =? DP=55, RH = 30-31%
21 How is heat exchanged between the Earth s surface and the atmosphere? DAY DAY NIGHT How do the physical properties of air change when it rises or sinks? How do these features affect the Earth s surface temperature?
22 How does heating and cooling differ between these materials? How can vegetation affect air temperatures? Conductivity of surface properties List the following from good (1) to poor (5) conductors: wood/litter metal air water soil Which is the better conductor and why? Dry vs. wet soils? Compact soil vs. porous duff? How will good and poor conductors differ in their temperature between night and day?
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