Transcript RGB products for Operational

Australian VLab Centre of Excellence
National Himawari-8
Training Campaign
Introduction to the Airmass RGB
product (Southern Atlantic
Ocean, Western Europe)
Part 1a: Instructions
• Now that you have downloaded the PowerPoint file, please read the
Instructions in Parts 1a (this slide) and familiarise yourself with the
Learning Outcomes in slide 1b (next slide)
• Print out the Worksheet in Part 2a of this file (if applicable)
• Examine the Pre-activity Resources in Part 2b of this file (if applicable).
• Download the appropriate accompanying Video Recording (.wmv file).
The recording is typically of 3-13 minute duration.
• Commence listening to the Recording. Pause the Recording whenever
you want to annotate notes on the Worksheet.
• You may wish to examine the slides in Part 3 of this file in Slideshow
mode when you stop the Recording. Note that Rapid Scan imagery in
the animations embedded in the PowerPoint slides is often clearer than
in the Recording.
• Towards the end of the recording, recommended answers for the
exercises are sometimes given.
Part 1b: Learning Outcomes
At the end of this exercise you will:
• Have a basic knowledge how the Airmass RGB product is constructed from
multiple satellite channels and the physics and meteorology underpinning this.
• Have a better understanding of the advantages and the limitations of the
Airmass RGB product in comparison with single channel water vapour satellite
imagery in the operational monitoring, nowcasting and short term forecasting
of features in the middle and upper levels of the atmosphere.
• Be able to identify and locate mid and upper atmosphere features such as
ozone rich intrusions associated with jetstreams, upper lows etc. in the
Airmass RGB product.
• Have a better appreciation of using the Airmass RGB product in rapid scan
animation when monitoring, nowcasting and short term forecasting of
features in the middle and upper levels of the atmosphere.
• Note – corresponding WMO-1083 Capabilities and BOM Enabling Skills are
given on the link "Underpinning WMO-1083 Capabilities and BOM Enabling
Skills" on the National Himawari-8 Training Campaign homepage.
Part 2a: Worksheet for the exercise
• The worksheet " Airmass RBG vs 6.2 micron water vapour
channel" is on the next slide. Please print this slides out and use it
to make your notes
Part 2b: Pre-activity resources
• Please study the three slides of Part 2b to familiarize yourself with
the Airmass RGB product.
Part 2a: The Airmass RGB vs 6.2 micron water vapour
images from EUMETSAT
channel
Question – what additional
Your answer:
information does the Airmass RGB
give you, compared to the 6.2 micron
water vapour channel ?
Question – what additional detail
is the water vapour channel giving
you ?.
Your answer:
Part 2b: RGB products for Operational Forecasting –
EumetSAT recommendation – the Airmass RGB
Two RGB composites which complement each other
Airmass RGB
24 hour Microphysical RGB
Five application specific RGBs
Day
Microphysical
RGB
Night
Microphysical
RGB
Day Severe
Convection
RGB
Snow / fog
RGB
from RGB Products
Overview (RGB Tutorial)
J. Kerkmann EumetSAT
Natural
Colours RGB
Part 2b: Airmass RGB beams explained
UTH = upper tropopause height
Jetstreak (moderate RED component, weak GREEN component, weak Blue component)
Warm airmass (weak RED component, moderate GREEN component, weak Blue component)
Cold airmass (weak/mod RED component, weak GREEN component, moderate Blue component)
from http://oiswww.eumetsat.int/~idds/html/doc/airmass_interpretation.pdf
Part 2b: Airmass RGB
beams explained
BTD6.2−7.3
Moisture content at roughly 700-400 hPa and 500-200 hPa levels,
approximated by BT difference of split WV window.
BTD IR9.7IR10.8
Total ozone concentration (tropopause height) approximated by the BT
difference between 9.7mm (O3 channel) and 10.8mm.
[to distinguish between ozone-rich polar and ozone-poor (sub) tropical
airmasses]
IR 6.2
Upper level moisture content provided by the BT at 6.2mm.
Combining beams
•
Yellow is made by mixing red and green
•
Magenta is made by mixing red and blue
•
Cyan is made by mixing green and blue
from http://oiswww.eumetsat.int/~idds/html/doc/airmass_interpretation.pdf
Part 3: The Airmass RGB
compared to the 6.2 micron
WV channel
Beam
Channel
Range
Gamma
Gamma 2
Red
WV6.2 - WV7.3
-25 ... 0 K
1.0
1.0
Green
IR9.7 – IR10.8
-40 ... +5 K
1.0
1.0
Blue
WV6.2
+243 ... +208 K
1.0
1.0
Part 3: The Airmass RGB vs 6.2 micron water vapour channel
images from EUMETSAT
6.2 micron water vapour channel
Question – what additional
Your answer:
information does the Airmass RGB give
you, compared to the 6.2 micron water
vapour channel ?
Question – what additional detail is
the water vapour channel giving you ?.
Your answer:
Part 3: Airmass RGB animation – W Europe 11th October 2006
Images from EUMETSAT