EARTH SCIENCE Prepared by:

Julie Rose P. Mendoza

PRECIPITATION

1

2

X

A WATER THAT RETURNS TO THE SURFACE

OF THE EARTH, IN EITHER THE

LIQUID OR SOLID FORM.

TWO MECHANISMS OF PRECIPITATION

TWO (2) MECHANISMS OF PRECIPITATION

BERGERON PROCESS

(COLD CLOUDS)

COLLISION-COALESCENCE

PROCESS (WARM

CLOUDS)

BERGERON PROCESSNAMED AFTER ITS

SWEDISH DISCOVERER

TOR BERGERON

IT CAN PRODUCE PRECIPITATION THROUGHOUT THE YEAR IN THE MIDDLE LATITUDES, PROVIDED AT LEAST THE UPPER PORTIONS OF CLOUDS ARE COLD ENOUGH TO GENERATE ICE CRYSTALS.

EXHIBITS TWO PHENOMENA

SUPERSATURATION

SUPERCOOLING

SUPERCOOLED

WATER IS IN THE LIQUID STATE BELOW 00C .

IT WILL READILY FREEZE IF IT IMPACTS AN OBJECT.

COLLISION-COALESCENCE PROCESS

COLLISION COALESCE

CRASH JOIN TOGETHER

COLLISION-COALESCENCE PROCESS

IT OCCURS IN THE TROPICS; WHEREIN LARGER DROPS OF

WATER WITH FAST FALL VELOCITIES GROW BY

COLLISION AND COALESCENCE.

FORMATION OF PRECIPITATION

FOR PRECIPITATION TO FORM, CLOUD DROPLETS

MUST GROW IN VOLUME BY ROUGHLY

ON MILLION TIMES.

FORMS OF

PRECIPITATION

MISTS

DROPLETS LARGE ENOUGH TO BE FELT ON THE FACE WHEN AIR IS

MOVING 1 M/S.

RAIN, DRIZZLE, SLEET

DROPS OF WATER

THAT FALL FROM A CLOUD AND HAVE A

DIAMETER OF AT LEAST 0.5

MILLIMETER.

BLUFF!!! BACK

RAIN

DROPS OF WATER THAT FALL FROM A CLOUD AND HAVE A DIAMETER OF AT LEAST 0.5 MILLIMETER.

DRIZZLEFINE UNIFORM DROPS OF WATER HAVING A

DIAMETER LESS THAN 0.5 MILLIMETER, BECAUSE OF ITS

FINEST, IT APPEARS TO FLOAT AND THEIR IMPACT IS ALMOST

IMPERCEPTIBLE.

SNOW, SLEET, GLAZE

PRECIPITATION IN THE FORM OF ICE CRYSTALS

OR, MORE OFTEN, AGGREGATES OF

CRYSTALS.

SNOW

A PRECIPITATION IN THE FORM OF ICE

CRYSTALS OR, MORE OFTEN, AGGREGATES

OF CRYSTALS.

SLEET

A WINTER TIME PHENOMENON AND

REFERS TO THE FALL OF SMALL PARTICLES OF ICE

THAT ARE CLEAR TO TRANSLUCENT.

GLAZE

ALSO KNOWN FREEZING RAIN. IT CAN FORM A THICK COATING

OF ICE HAVING SUFFICIENT WEIGHT TO SERIOUSLY DAMAGE

TREES AND POWERLINES.

HAIL

A PRECIPITATION IN THE FORM OF HARD, ROUNDED PELLETS OR

IRREGULAR LUMPS OF ICE.

IT IS A VERY DESTRUCTIVE FORM OF PRECIPITATION.

RIME, SLEET, GRAUPEL

ALSO KNOWN AS SOFT HAIL, THESE PARTICLES

ARE SOFTER THAN HAILSTONES, THEY

NORMALLY FLATTEN OUT UPON IMPACT.

BLUFF!!! BACK

GRAUPEL

KNOWN AS SOFT HAIL, THESE

PARTICLES ARE SOFTER THAN

HAILSTONES, THEY NORMALLY FLATTEN OUT UPON IMPACT.

RIME

A DEPOSIT OF ICE CRYSTALS FORMED BY THE FREEZING OF SUPERCOOLED FOG OR CLOUD DROPLETS ON OBJECT WHOSE

SURFACE TEMPERATURE IS BELOW FREEZING.

TYPE SIZESTATE OF MATTER

MIST 0.005-0.05 MM LIQUID

DRIZZLE LESS THAN 0.5 MM LIQUID

RAIN 0.5-5 MM LIQUID

SNOW 5 MM-10 CM SOLID

SLEET 0.5-5 MM SOLIDGLAZE LAYERS 1 MM-2CM THICK SOLIDHAIL 2-5 MM SOLID

GRAUPEL ------ SOLID

RIME ------ SOLID

Hope you learn something !