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W ATER C YCLE A ND W EATHER S CALES

W ATER C YCLE A ND W EATHER S CALES. What is weather scale?. Meteorologists classify weather phenomena into four classes or scales. The four scales are: microscale, mesoscale, synoptic scale, and global scale. Each scale has its own phenomena. Global scale. Global scale

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W ATER C YCLE A ND W EATHER S CALES

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  1. WATER CYCLE AND WEATHER SCALES

  2. What is weather scale? • Meteorologists classify weather phenomena into four classes or scales. The four scales are: microscale, mesoscale, synoptic scale, and global scale. • Each scale has its own phenomena.

  3. Global scale • Global scale • These patterns are covering tens of thousands of miles and affecting large parts of the world.

  4. Analyse water cycle over the global • To assess water resource (change) • To assess soil erosion (change) • To assess …… (change) Vaporout Vapor in temperature, precipitation radiation , …… large spatial scale (planetary scale) long time scale (year) imprecise result (trend, change)

  5. dry heating Plateau (moist/dry) moist precipitation gulf Mississippi plain Synoptic Scale • The synoptic scale is the level just below the global scale. gulf of Mexico Mexican plateau medium spatial scale ("weather map" scale ) medium time scale Medium-range weather forecast - flood control, combat drought

  6. Mesoscale Land surfaces absorb and emit radiation more efficiently than water surfaces. Therefore, a thermally driven circulation will form. Sea breeze may bring significant precipitation. • Mesoscale phenomena have an approximate size between 1km and 100 km and a time span between a few minutes to a day. cold warm cold

  7. Relation between different scales--Nested Grid • A model may have a low grid resolution for a large area . Then, it has the ability to take a higher resolution grid and nest it over a region of importance. • Initial conditions: • Observed data • or • data from larger scale model

  8. May it be “from above to below”? imprecise model The SST of the Atlantic Ocean will affect the precipitation at Tokyo.

  9. Land surface model • Although land(30%) is smaller than ocean(70%), over land, variations in soil moisture can lead to as large differences in BL θe as several degrees in SST.

  10. 2 1 3 1 The World’s Water Cycle

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