PRECIPITATION
Download
1 / 93

PRECIPITATION - PowerPoint PPT Presentation


  • 104 Views
  • Uploaded on

PRECIPITATION. CURVATURE EFFECT. Q. Why are cloud droplets larger over the ocean?. COLLISION- COALESCENCE PROCESS. Most collide on forward edge Some collide on backside. Terminal velocity : Almost 10 m/s for largest raindrops. Q. Why can a cumuliform cloud produce

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' PRECIPITATION' - winter


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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript


Q. Why are cloud droplets

larger over the ocean?


COLLISION-

COALESCENCE

PROCESS

Most collide on forward edge

Some collide on backside

Terminal velocity:

Almost 10 m/s for largest raindrops


Q. Why can a cumuliform cloud produce

heavier precipitation than a stratiform cloud?

"Warm" Cloud



Deposition nuclei

Ice forms directly on ice nuclei

Freezing Nuclei

Promote freezing of supercooled droplets

(contact nuclei)


Ice crystals grow at

the expense of water

droplets

Higher saturation vapour pressure


  • Riming causes

  • snow pellets (graupel)

  • supercooled droplets

  • freeze on contact

Snowflakes form

through aggregation



ARTIFICIAL CLOUD SEEDING

Source: Desert Research

Institute, Nevada, USA

Source: North Dakota Cloud Modification Project, USA


Source: North Dakota Cloud Modification Project, USA



18cm diameter

World's

Largest

Hailstone

Aurora, Nebraska

June 22, 2003


I almost

didn't make

it here !


AIR PRESSURE,

FORCES AND WIND



WIND

SMALL-SCALE &

LOCAL SYSTEMS

CHAPTER 10



SONIC

ANEMOMETER

SOUND WAVES

DETERMINEWIND SPEED,

DIRECTION &

TEMPERATURE

Sonic transducers



SNOWDRIFT

http://www.wrds.uwyo.edu/wrds/rmfres/fendrift.html


Effect of

Surface

Roughness

and Instability

on Windspeed


Depth of mixing depends on:

Surface Heating

WIND SPEED

TOPOGRAPHY

SURFACE ELEMENTS










Lake-induced convergence

Also SW Ontario




CHINOOK !

Cooling

At MALR

6°C/km

Warming

At DALR

10 °C/km

Warming

At DALR

10 °C/km

Cooling

At MALR

6°C/km

Cooling

At DALR

10 °C/km

X

X

VANCOUVER

LETHBRIDGE

12°C

8°C

More sensible heat






Ventifacts

Entrained Particle

Exposed section

Buried Portion



ad