Applications of meteosat second generation meteosat 8 airmass rgb
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APPLICATIONS OF METEOSAT SECOND GENERATION (Meteosat-8) AIRMASS RGB PowerPoint PPT Presentation


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Jochen Kerkmann Satellite Meteorologist, Training Officer [email protected] Contributors: G. Bridge (EUM), C. Georgiev (Bulgaria) P. Chadwick (Canada). APPLICATIONS OF METEOSAT SECOND GENERATION (Meteosat-8) AIRMASS RGB. Objectives.

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APPLICATIONS OF METEOSAT SECOND GENERATION (Meteosat-8) AIRMASS RGB

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Applications of meteosat second generation meteosat 8 airmass rgb

Jochen Kerkmann

Satellite Meteorologist, Training Officer

[email protected]

Contributors: G. Bridge (EUM), C. Georgiev (Bulgaria)

P. Chadwick (Canada)

APPLICATIONS OFMETEOSAT SECOND GENERATION (Meteosat-8)AIRMASS RGB


Applications of meteosat second generation meteosat 8 airmass rgb

Objectives

  • Learn how to generate the Airmass RGB (Recipe)

  • Learn how to use/interpret the WV6.2 - WV7.3 and theIR9.7 - IR10.8 brightness temperature difference (BTD)

  • In particular, understand the relationship between the IR9.7 - IR10.8 BTD and the total ozone content

  • Short overview of WV image interpretation

  • Interpretation of colours of the Airmass RGB

  • Usage of the Airmass RGB composite for monitoring jet streams, cyclogenesis, PV maxima etc.


Applications of meteosat second generation meteosat 8 airmass rgb

THE "AIRMASS" RGB

R = Difference WV6.2 - WV7.3

G = Difference IR9.7 - IR10.8

B = Channel WV6.2

Applications:Rapid Cyclogenesis, Jet Stream Analysis, PV Analysis

Area:Full MSG Viewing Area

Time:Day and Night


Applications of meteosat second generation meteosat 8 airmass rgb

Airmass RGB: Recipe

Recommended Range and Enhancement:

BeamChannelRangeGamma

RedWV6.2 - WV7.3-25 … 0 K1.0

GreenIR9.7 - IR10.8-40 … +5 K1.0

BlueWV6.2 +243 … +208 K1.0


Applications of meteosat second generation meteosat 8 airmass rgb

Airmass RGB Example

combines the best three MSG features for the early detection of rapid cyclogenesis !

MSG-1, 07 January 2005, 03:00 UTC, RGB Composite

WV6.2-WV7.3, IR9.7-IR10.8, WV6.2


Applications of meteosat second generation meteosat 8 airmass rgb

Airmass RGB: Colour Inputs

Red = WV6.2 - WV7.3 Green = IR9.7 - IR10.8

Blue = WV6.2i RGB


Applications of meteosat second generation meteosat 8 airmass rgb

Airmass RGB: Colour Inputs

Red = WV6.2 - WV7.3 Green = IR9.7 - IR10.8

Blue = WV6.2i RGB


Applications of meteosat second generation meteosat 8 airmass rgb

Red Colour Beam: WV6.2 - WV7.3

Recommended Range and Enhancement:

BeamChannelRangeGamma

RedWV6.2 - WV7.3-25 … 0 K1.0


Applications of meteosat second generation meteosat 8 airmass rgb

Channel 05 (WV6.2)

MSG-1, 07 January 2005, 03:00 UTC, Channel 05 (WV6.2)

Range: 253 K (black) to 213 K (white)


Applications of meteosat second generation meteosat 8 airmass rgb

Channel 06 (WV7.3)

MSG-1, 07 January 2005, 03:00 UTC, Channel 06 (WV7.3)

Range: 273 K (black) to 213 K (white)


Applications of meteosat second generation meteosat 8 airmass rgb

BTD WV6.2 - WV7.3

MSG-1, 07 January 2005, 03:00 UTC, Difference WV6.2 - WV7.3

Range: -35 K (black) to 0 K (white)


Applications of meteosat second generation meteosat 8 airmass rgb

BTD WV6.2 - WV7.3

For cloud-free scenes, the BTD between WV6.2 and WV7.3 depends on (in order of priority):

I.temperature and humidity profile

II.satellite viewing angle


Applications of meteosat second generation meteosat 8 airmass rgb

BTD WV6.2 - WV7.3

For cloudy scenes, the BTD between WV6.2 and WV7.3 depends on (in order of priority):

I.temperature and humidity profile (above the cloud)

II.satellite viewing angle

III.emissivity of cloud at WV6.2 and WV7.3


Applications of meteosat second generation meteosat 8 airmass rgb

BTD WV6.2 - WV7.3

Case I:

Very Dry

Atmosphere

very small BTD

0

-10

-20

-25

6.2 m

7.3 m

T(850 hPa)

Moist Layer: opaque to the radiation at WV6.2 and WV7.3(Planetary Boundary Layer)


Applications of meteosat second generation meteosat 8 airmass rgb

BTD WV6.2 - WV7.3

Case II:

Moist Layer

at 700 hPa

small BTD

0

-10

-20

-25

6.2 m

7.3 m

T(700 hPa)

Moist Layer: opaque to the radiation at WV6.2 less opaque to the radiation at WV7.3

T(850 hPa)

Moist Layer: opaque to the radiation at WV6.2 and WV7.3(Planetary Boundary Layer)


Applications of meteosat second generation meteosat 8 airmass rgb

BTD WV6.2 - WV7.3

Case III:

Moist Layer

at 500 hPa

large BTD

0

-10

-20

-25

6.2 m

7.3 m

T(500 hPa)

Moist Layer: quasi opaque to the radiation at WV6.2 quite transparent to the radiation at WV7.3

T(850 hPa)

Moist Layer: opaque to the radiation at WV6.2 and WV7.3(Planetary Boundary Layer)


Applications of meteosat second generation meteosat 8 airmass rgb

BTD WV6.2 - WV7.3

Case IV:

Moist Layer

at 200 hPa

small BTD

0

-10

-20

-25

6.2 m

7.3 m

T(200 hPa)

Moist Layer: quite transparent to the radiation at WV6.2 transparent to the radiation at WV7.3

T(850 hPa)

Moist Layer: opaque to the radiation at WV6.2 and WV7.3(Planetary Boundary Layer)


Applications of meteosat second generation meteosat 8 airmass rgb

BTD WV6.2 - WV7.3

MSG-1, 07 January 2005, 03:00 UTC, Difference WV6.2 - WV7.3

Range: -30 K (black) to +5 K (white)


Applications of meteosat second generation meteosat 8 airmass rgb

Green Colour Beam: IR9.7 - IR10.8

Recommended Range and Enhancement:

BeamChannelRangeGamma

GreenIR9.7 - IR10.8-40 … +5 K1.0


Applications of meteosat second generation meteosat 8 airmass rgb

Channel 08 (IR9.7)

MSG-1, 07 January 2005, 03:00 UTC, Channel 08 (IR9.7 (ozone channel))

Range: 263 K (black) to 213 K (white)


Applications of meteosat second generation meteosat 8 airmass rgb

Channel 09 (IR10.8)

MSG-1, 07 January 2005, 03:00 UTC, Channel 09 (IR10.8)

Range: 293 K (black) to 213 K (white)


Applications of meteosat second generation meteosat 8 airmass rgb

BTD IR9.7 - IR10.8

MSG-1, 07 January 2005, 03:00 UTC, Difference IR9.7 - IR10.8

Range: -50 K (black) to 0 K (white)


Applications of meteosat second generation meteosat 8 airmass rgb

BTD IR9.7 - IR10.8

For cloud-free scenes, the BTD between IR9.7 and IR10.8 depends on (in order of priority)*:

I.temperature difference between T(surf) and T(ozone)

II.total ozone concentration

III.satellite viewing angle

IV.emissivity of surface at IR9.7 and IR10.8(e.g. desert surface has a 3% difference in emissivity,water has a difference of 0.3 %)

==>strong diurnal/seasonal cycle due toT(surf) variation

*neglecting WV absorption


Applications of meteosat second generation meteosat 8 airmass rgb

BTD IR9.7 - IR10.8

For cloudy scenes, the BTD between IR9.7 and IR10.8 depends on (in order of priority)*:

I.temperature difference between T(cloud) and T(ozone)

II.total ozone concentration

III.Satellite viewing angle

IV.emissivity of cloud at IR9.7 and IR10.8

For high-level clouds:T(cloud)  T(ozone)For mid/low-level clouds:T(cloud) > T(ozone)

*neglecting WV absorption


Applications of meteosat second generation meteosat 8 airmass rgb

BTD IR9.7 - IR10.8

9.7 m

10.8 m

T(ozone)

T(surf/cloud)

(surf/cloud)9.7

(surf/cloud)10.8


Applications of meteosat second generation meteosat 8 airmass rgb

BTD IR9.7 - IR10.8

Case I:

Rich OzonePolar Airmass

large BTD

+5

-20

-40

9.7 m

10.8 m

T(ozone)

T(surf)


Applications of meteosat second generation meteosat 8 airmass rgb

BTD IR9.7 - IR10.8

Case II:

Low OzoneTropical Airmass

smaller BTD

+5

-20

-40

9.7 m

10.8 m

T(ozone)

T(surf)


Applications of meteosat second generation meteosat 8 airmass rgb

BTD IR9.7 - IR10.8: Effect of T(surf)

23 June 2004, 12:00 UTC

07 January 2005, 12:00 UTC

Difference IR9.7 - IR10.8

Range: -45 K (black) to +5 K (white)


Applications of meteosat second generation meteosat 8 airmass rgb

BTD IR9.7-IR10.8: Effect of Ozone

260 DU  -25 K

320 DU  -33 K

400 DU  -40 K

Thumb rule:

BTD IR9.7-IR10.8 [K] = -TOZ [DU]/10


Applications of meteosat second generation meteosat 8 airmass rgb

BTD IR9.7-IR10.8: Effect of Ozone


Applications of meteosat second generation meteosat 8 airmass rgb

BTD IR9.7-IR10.8: Effect of Ozone

Source: MeteoSwiss

Annual cycle of the total ozoneamount above Arosa (CH)


Applications of meteosat second generation meteosat 8 airmass rgb

BTD IR9.7-IR10.8: Effect of Ozone

Source: MeteoSwiss


Applications of meteosat second generation meteosat 8 airmass rgb

BTD IR9.7-IR10.8: Effect of Viewing Angle

The larger the satellite viewing angle, the stronger the ozone absorption effect(limb cooling) !

MSG-1, 31 October 2003, 11:30 UTC

Difference IR9.7 - IR10.8


Applications of meteosat second generation meteosat 8 airmass rgb

Blue Colour Beam: WV6.2

Recommended Range and Enhancement:

BeamChannelRangeGamma

BlueWV6.2 +243 … +208 K1.0


Applications of meteosat second generation meteosat 8 airmass rgb

Channel 05 (WV6.2)

MSG-1, 07 January 2005, 03:00 UTC, Channel 05 (WV6.2)

Range: 253 K (black) to 213 K (white)


Applications of meteosat second generation meteosat 8 airmass rgb

Features seen in WV Images

United

Kingdom

Dry intrusion

France

Met-7, 26 December 1999, 06:00 UTC, WV Channel

(Storm "Lothar")

Source: DWD


Applications of meteosat second generation meteosat 8 airmass rgb

Features seen in WV Images

Convex Deformation Zone

Saddle Point

X

N

X

N

GOES-12, 14 February 2004, 00:15 UTC, WV Channel

Source: NOAA & P. Chadwick


Applications of meteosat second generation meteosat 8 airmass rgb

Features seen in WV Images

Stau cloud

Foehn

Mountain waves in cloud-free areas

with possible Clear Air Turbulence (CAT)

Italy

MSG-1, 21 January 2005, 12:15 UTC, Channel 05 (WV6.2)


Applications of meteosat second generation meteosat 8 airmass rgb

Features seen in WV Images

Algeria

Mali

High-level gravity waves caused by thunderstorms

MSG-1, 25 June 2005, 14:15 UTC, Channel 05 (WV6.2)


Applications of meteosat second generation meteosat 8 airmass rgb

Airmass RGB: Colour Interpretation

3

4

2

1

4

3

2

1

3

2

4

1

1 = high clouds (white)

2 = mid-level clouds (light ochre)

3 = rich ozone tropical airmass with high tropopause (greenish)

4 = low ozone polar airmass with low tropopause (bluish)

5

-25 K WV6.2 - WV7.3 0 K

5

-40 K IR9.7 - IR10.8 +5 K

5

243 K WV6.2 208 K

5 = rich ozone airmass ofdry air

with a tropopause folding


Applications of meteosat second generation meteosat 8 airmass rgb

Airmass RGB Example: Warm Airmass

MSG-1, 7 January 2005, 22:00 UTC


Applications of meteosat second generation meteosat 8 airmass rgb

Airmass RGB Example: Cold Airmass

MSG-1, 7 January 2005, 22:00 UTC


Applications of meteosat second generation meteosat 8 airmass rgb

Airmass RGB Example: Advection Jet

MSG-1, 7 January 2005, 22:00 UTC


Applications of meteosat second generation meteosat 8 airmass rgb

Airmass RGB: Interpretation of Colours

Jet (high PV) Cold Airmass Warm Airmass Warm Airmass

Thick, high-level clouds

Thick, mid-level clouds

Thick, low-level clouds

(warm airmass)

Thick, low-level clouds

(cold airmass)

High UTH Low UTH


Applications of meteosat second generation meteosat 8 airmass rgb

Airmass RGB: Colour Interpretation

1 = high clouds

2 = mid-level clouds

3 = warm airmass, high tropopause

4 = cold airmass, low tropopause

5 = dry descending stratospheric air

2

1

5

MSG-1

07 January 2005

15:00 UTC

RGB Composite

R = WV6.2 - WV7.3

G = IR9.7 - IR10.8

B = WV6.2

4

3


Applications of meteosat second generation meteosat 8 airmass rgb

Airmass RGB: Colour Interpretation

1 = high cloud

(severe convective storm)

2 = mid-level clouds

3 = hot land surface

(high UTH)

4 = hot land surface

(low UTH)

1

3

MSG-1

21 August 2006

12:00 UTC

RGB Composite

R = WV6.2 - WV7.3

G = IR9.7 - IR10.8

B = WV6.2

4

2

2


Applications of meteosat second generation meteosat 8 airmass rgb

Airmass RGB

Global View

Note: warm airmasses seen at a high satellite viewing angle appear with a bluish colour (limb cooling effect) !

MSG-1

19 April 2005

10:00 UTC


Applications of meteosat second generation meteosat 8 airmass rgb

Comparison Airmass RGB vs PV 300 hPa

MSG-1, 8 January 2005, 06:00 UTC


Applications of meteosat second generation meteosat 8 airmass rgb

Comparison Airmass RGB vs TOZ

MSG-1, 8 January 2005, 06:00 UTC


Applications of meteosat second generation meteosat 8 airmass rgb

Comparison Airmass RGB vs PV/TOZ

MSG-1, 08 January 2005, 06:00 UTC

PV 300 hPa

Total Ozone


Applications of meteosat second generation meteosat 8 airmass rgb

Comparison Airmass RGB vs PV/TOZ

MSG-1, 08 January 2005, 06:00 UTC

PV 300 hPa

Total Ozone


Applications of meteosat second generation meteosat 8 airmass rgb

Comparison Airmass RGB vs PV 300 hPa

reddish areas

high PV values

19 January 2005, 06:15 UTC


Applications of meteosat second generation meteosat 8 airmass rgb

SUMMARY

  • The "Airmass" RGB is a combination of 4 channels: WV6.2, WV7.3, IR9.7 and IR10.8

  • It helps to detect the position of jet streams and areas of dry descending stratospheric air with high PV (red areas)

  • It also helps to discriminate airmasses (rich ozone tropical airmass, low ozone polar airmass)

  • It is also useful to detect typical WV features like deformation zones and wave features

  • At the same time, through the use of the IR channels, it allows to monitor cloud development at low, mid and high levels


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