1 / 20

Hydrologic Cycle

Hydrologic Cycle. Humidity. Refers to the amount of water vapor in the air Specific Ratio of water vapor to air (dry air + water vapor) for a given parcel Does not change with expansion or compression Relative

natan
Download Presentation

Hydrologic Cycle

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Hydrologic Cycle

  2. Humidity • Refers to the amount of water vapor in the air • Specific • Ratio of water vapor to air (dry air + water vapor) for a given parcel • Does not change with expansion or compression • Relative • Ratio of amount of water vapor for a given parcel to amount of water vapor if air was saturated • Absolute • Density of water in a given parcel of air • Subjected to volume changes • Warm air has greater capacity to hold moisture than cool air

  3. Relative Humidity • A ratio of the amount of water vapor in the air, relative to how much water vapor that air can hold…… • WHAT IS THE PROBLEM WITH USING RELATIVE HUMIDITY TO SEE IF THE AIR IS HUMID? Actual water vapor content of the air Relative humidity = X 100 Maximum water vapor capacity of the air at that temperature

  4. Specific Humidity

  5. Air Saturation and Dew Point • = 100% relative humidity; that is the air is holding as much moisture as it can at its temperature = saturation and dew point • Dew Point is temperature to which air would have to be cooled to achieve saturation assuming there is no change in pressure or moisture content • DEW POINT IS A GOOD INDICATOR OF HOW MUCH MOISTURE IS IN THE AIR.

  6. General Dewpoint Thresholds

  7. Fun with the Heat Index Calculator • http://www.easysurf.cc/cnver16.htm

  8. Fog • Fog is a cloud at ground level • Indicates saturated conditions at ground level • Fog types • Advection fog- warm moist air moves over a cold surface • Evaporation or steam fog- cold air moves over warm water • Radiation fog- air layer in contact with the ground cools to dew point…..creates shallow fog on calm clear nights

  9. WHAT KIND IS THIS?

  10. WHAT KIND????

  11. Heavy Fog Days

More Related