version 1.0, 30 november 2004 slide: 1 meteosat second generation (msg) dust detection author:jochen...

Version 1.0, 30 November 2004 Slide: 1

METEOSAT SECOND GENERATION

(MSG)

DUST DETECTION

Author:Author: Jochen KerkmannJochen [email protected]@eumetsat.de

Contributors:Contributors: H.-J. Lutz (EUMETSAT), HP. Roesli (MeteoSwiss)H.-J. Lutz (EUMETSAT), HP. Roesli (MeteoSwiss)D. Rosenfeld (HUJ)D. Rosenfeld (HUJ)


Day-time Dust Storms over the Red Seaand the Middle East

25 June 2003


MSG VIS imagery on 25 June 2003 at 10:00 UTCshowing a major dust storm over the Red Sea. The dust storm over the

Arabian Peninsula is not visible in VIS imagery.

Channel 01 (0.6 m) Channel 02 (0.8 m) Channel 03 (1.6 m)

Dust Storms


MSG IR imagery on 25 June 2003 at 10:00 UTCshowing a dust storm over the Arabian Peninsula.


Dust Storms


MSG-125 June 200310:00 UTCRGB CompositeR = NIR1.6G = VIS0.8B = VIS0.6


MSG-125 June 200310:00 UTCRGB CompositeR = VIS0.6G = NIR1.6B = IR3.9


MSG-125 June 200310:00 UTCChannel 12(HRVIS)


MSG-125 June 200310:00 UTCDifference ImageChannels NIR1.6 - VIS0.6"Snow/Ice Index"

Monitoring of thick ice clouds (like Cb and Ns). Thin Cirrus and dust over desert are not detected.


MSG-125 June 200310:00 UTCDifference ImageChannels IR3.9 - IR10.8

Monitoring of fires and fog, but also useful for the detection of dust storms over deserts.

Dust Storms


MSG-125 June 200310:00 UTCDifference ImageChannels IR8.7 - IR10.8

Monitoring of thin Cirrus clouds, but also useful for detecting dust storms over deserts (day and night).

Sulfur Plant Fire

Dust Storms


Day-time Dust Storm over Niger7 July 2003


MSG imagery showing a duststorm over Niger

MSG-17 July 200311:00 UTCChannel 01(0.6 m)


MSG VIS imagery on 7 July 2003 at 11:00 UTCshowing a duststorm over Niger



MSG IR imagery on 7 July 2003 at 11:00 UTCshowing a duststorm over Niger



Diff. 3.9 m - 10.8 m Diff. 8.7 m - 10.8 m Diff. 12.0 m - 10.8 m

MSG imagery on 7 July 2003 at 11:00 UTCshowing a duststorm over Niger


Diff. 8.7 m - 10.8 m Diff. 12.0 m - 10.8 mMSG enhanced imagery on 7 July 2003 at 11:00 UTC

showing a duststorm over Niger


MSG imagery showing a duststorm over Niger

MSG-17 July 200311:00 UTCChannel 12(HRV)


Day-time Dust Storm over Algeria14 July 2003


MSG imagery showing a dust storm over Algeria, which was triggered by a major convetive storm (squall line)

MSG-114 July 200308:45 UTCChannel 01(VIS0.6)


MSG VIS imagery on 14 July 2003 at 08:45 UTCshowing a dust storm over Algeria



MSG IR imagery on 14 July 2003 at 08:45 UTCshowing a dust storm over Algeria




MSG imagery on 14 July 2003 at 08:45 UTCshowing a dust storm over Algeria


MSG enhanced imagery on 14 July 2003 at 08:45 UTCshowing a dust storm over Algeria



MSG-114 July 200310:00 UTCRGB CompositeR = IR12.0 - IR10.8G = IR10.8 - IR8.7B = IR10.8

Recommended RGBfor Monitoring of

Dust Storms(day & night)

1= dust storm

2= clear ground

3 = low-level clouds

4 = thin high-level clouds

5 = thick high-level clouds

1

2

3

4

1

2

3

45

1


Night-time Dust Storm over Algeria14 July 2003


MSG IR imagery on 14 July 2003 at 02:00 UTCshowing a dust storm over Algeria




MSG imagery on 14 July 2003 at 02:00 UTCshowing a dust storm over Algeria


MSG enhanced imagery on 14 July 2003 at 02:00 UTCshowing a dust storm over Algeria



MSG-114 July 200302:00 UTCDifference ImageIR8.7 - IR10.8

Monitoring of ice clouds, but also very useful for detecting dust storms over deserts (day and night).

Click on the icon tosee the animation

(02:00 - 08:30 UTC,AVI, 5475 KB) !


MSG-114 July 200302:00 UTCDifference ImageIR8.7 - IR10.8


(02:00 - 08:30 UTC,AVI, 3305 KB) !

Same as previous slide, but different colour bar !


Day-time Dust Storm overthe Mediterranean Sea

21 February 2004


MSG-121 February 200412:00 UTCRGB CompositeR = HRVG = HRVB = IR10.8i


(07:00 - 12:00 UTC,GIF, 6134 KB) !

Dust


MSG-121 February 200413:00 UTCRGB CompositeR = IR12.0-IR10.8G = IR10.8-IR8.7B = IR10.8

Dust

Dust

Thin high-level ice clouds

Thick high-level ice clouds

Recommended RGB for Monitoring of Dust Storms(day & night)


Day & Night-time Dust Storm overWestern Africa and the Canary Islands

02-04 March 2004


MSG-103 March 200412:00 UTCRGB CompositeR = IR12.0-IR10.8G = IR10.8-IR8.7B = IR10.8

Dust

Contrails


(reduced resolution,02-03 March 2004,12:00 - 12:00 UTC,AVI, 21097 KB) !



(12:00 - 18:00 UTC,AVI, 9846 KB) !

MSG-13 March 200417:00 UTCChannel 12(HRV)

Gravity waves in the lee of Fuerteventura

Dust flows around Gran Canaria and Tenerife


MSG-13 March 200417:00 UTCRGB CompositeR = NIR1.6G = VIS0.8B = VIS0.6


(12:45 - 19:00 UTC,AVI, 9144 KB) !

Dust flows around Gran Canaria and Tenerife

Snow


Sahara Dust Outbreakacross the Atlantic Ocean

04-10 March 2004


MSG-1, 04 March 2004, 12:00 UTC

RGB IR12.0-IR10.8, IR10.8-IR8.7, IR10.8 RGB NIR1.6, VIS0.8, VIS0.6 "Dust RGB" "Natural Colours RGB"

Click for full res. (JPG, 3971 KB) Click for full res. (JPG, 3305 KB)


MSG-1, 06 March 2004, 12:00 UTC




MSG-1, 08 March 2004, 12:00 UTC




SUMMARY


• dust storms over deserts can be detected in VIS and IRdust storms over deserts can be detected in VIS and IR• VIS0.6 better than VIS0.8VIS0.6 better than VIS0.8• NIR1.6 not useful (desert dustNIR1.6 not useful (desert dust “transparent” at “transparent” at

1.6-2.0 µm)1.6-2.0 µm)• IR10.8 best single IR channel (thermal IR technique)IR10.8 best single IR channel (thermal IR technique)• IR9.7 also useful !!!IR9.7 also useful !!!• Diff. 8.7-10.8 and 3.9-10.8 give the best resultsDiff. 8.7-10.8 and 3.9-10.8 give the best results• Diff. 12.0-10.8 (used for GOES) also goodDiff. 12.0-10.8 (used for GOES) also good

• Recommended RGB: IR12.0-IR10.8, IR10.8-IR8.7, IR10.8Recommended RGB: IR12.0-IR10.8, IR10.8-IR8.7, IR10.8

Detection of Dust Storms over Deserts during Day-time


• dust storms difficult to detect in IR (only in animation)dust storms difficult to detect in IR (only in animation)• IR8.7 best IR channel (different emission coefficients)IR8.7 best IR channel (different emission coefficients)• Diff. 8.7-10.8 gives the best results and detects dust very Diff. 8.7-10.8 gives the best results and detects dust very

well (over deserts)well (over deserts)• Diff. 12.0-10.8 also usefulDiff. 12.0-10.8 also useful• Diff. 3.9-10.8 less usefulDiff. 3.9-10.8 less useful

• Recommended RGB: IR12.0-IR10.8, IR10.8-IR8.7, IR10.8Recommended RGB: IR12.0-IR10.8, IR10.8-IR8.7, IR10.8

Detection of Dust Storms over Deserts during Night-time

version 1.0, 30 november 2004 slide: 1 meteosat second generation (msg) dust detection author:jochen...

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