Jeanway 0 Posted October 31, 2004 Air is set in motion by the Pressure Gradient Force (PGF). This, as you well know, is a flow from high pressure to low pressure. In nature, regions of excess move toward regions of deficit. This comes from the second law of thermodynamics that states higher energy states move toward lower energy states. Nature is always trying to balance. The result of trying to balance and equalize pressure results in wind. The pressure gradient force acts on a horizontal plane. What causes the pressure changes in the atmosphere? The primary reason is through the warming and cooling of air. The pressure exerted by a gas changes as it becomes more dense or less dense. Since a cold air mass is denser and has a lower thickness than warm air, pressure decreases more rapidly with height in cold air than in warm air. When cold dense air is placed next to warm less dense air, wind results by nature trying to balance the pressure differences at each level in the atmosphere between the two air masses. This can occur on all scales of motion. Examples: On the planetary scale, temperature gradients create the polar jet stream; on the synoptic scale it creates jet streaks; on the mesoscale it creates sea breeze circulations and the low level jet; on the microscale it creates lake breezes. Share this post Link to post Share on other sites
He Who Shall Not Be Named 2 Posted October 31, 2004 Um... OK. Share this post Link to post Share on other sites
Cougar 0 Posted October 31, 2004 um....ok what is this exactly about? Share this post Link to post Share on other sites
Jeanway 0 Posted October 31, 2004 "What causes the pressure changes in the atmosphere? The primary reason is through the warming and cooling of air. The pressure exerted by a gas changes as it becomes more dense or less dense. " Haven't you ever wondered about "Wind" ? Yesterday here it was extremely windy. Today there is NO wind at all. Share this post Link to post Share on other sites
Jeanway 0 Posted October 31, 2004 Lockheed Missiles and Space Co., Huntsville, AL (United States) Subject: CARBON DIOXIDE LASERS-- DESIGN; WIND-- CLIMATIC CHANGE;WIND-- GLOBAL ASPECTS;WIND-- REMOTE SENSING; BUDGETS;CONFIGURATION;CONTROL;DOPPLER EFFECT;MANAGEMENT;METEOROLOGY;NASA;ON-LINE SYSTEMS;OPTICAL RADAR;POLAR REGIONS;POWER;RADAR;RESERVES;STABILITY. Related Subject GAS LASERS;LASERS;MEASURING INSTRUMENTS;NATIONAL ORGANIZATIONS;RADAR;RANGE FINDERS;RESOURCES;US ORGANIZATIONS Design Definition Study has shown that a large scanning mirror/high pulse energy laser LAWS Instrument is feasible and within the existing technology.The capability to monitor wind velocities with backscatter ratios . The breadboard effort has produced significant laser advances for a tight 18 month schedule and the minimum budgets available from NASA, Lockheed, and TDS. This is an increase of over two or three times greater than any system previously developed from this type laser. The Lockheed LAWS design will operate in the gravity gradient mode on-orbit, and all possible instrument vibration and jitter modes have been considered. So you see the wind has alot to do with not only the weather but with Lasers, radar and missle controls. I didn't know this til today. Share this post Link to post Share on other sites
WEAREBORG4102 0 Posted November 6, 2004 Theoretically if you controlled the temperature of the earth, you could control the convections of the winds.... Share this post Link to post Share on other sites
Jeanway 0 Posted November 6, 2004 :o Really? Yea, I guess you could. But you'd need a really BIG fire Share this post Link to post Share on other sites
