Identifying CIT cases using in situ data and satellite cloud top temperatures Jamie Wolff NCAR/RAL...
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Identifying CIT cases using in situ data and satellite cloud top temperatures Jamie Wolff NCAR/RAL CIT mini-workshop Oct 12, 2006
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EDR -> intensity Current mapping of in situ EDR value to turbulence intensity (as displayed on ADDs): 0.05: Null 0.15 – 0.25: Light 0.35 – 0.45: Moderate 0.55 – 0.65: Severe 0.75: Extreme
Transcript of Identifying CIT cases using in situ data and satellite cloud top temperatures Jamie Wolff NCAR/RAL...
Identifying CIT cases using in situ data and satellite cloud
top temperaturesJamie WolffNCAR/RAL
CIT mini-workshop Oct 12, 2006
In situ DataGoal: To augment/replace subjective PIREPs with
objective and precise turbulence measurementsFeatures:• Automatically computes/records turbulence
intensities• Aircraft independent (eddy dissipation rate, EDR)• Automatically downloads data during flight using
ACARS network– Packet of 1-minute data downloaded every 4 minutes
• Horizontal uncertainty < 10 km• Time uncertainty < 1 min• Altitude very good
EDR -> intensity
• Current mapping of in situ EDR value to
turbulence intensity (as displayed on ADDs):
0.05: Null0.15 – 0.25: Light0.35 – 0.45: Moderate0.55 – 0.65: Severe0.75: Extreme
Filtering steps• Started with all in situ data from Jun – Oct 2005
(~7.1M)• Compared in situ temp report to IR sat CTT
– closest Sat +/- 1 hr– 757 data > 20,000 ft only– IR CTT < 0– Avg EDR >= 0.25
• 152 matches– 40 cases have peak EDR >= 0.45– 35 cases have Tdiff < 4C
• Previously presented 4 other cases (at July workshop)
– Sent out a list of ~20 above/near cloud cases
20050825 CO-NE
• Four cases– Northern Case
• 2222 UTC FL370 0.45 EDR– Southern Cases
• 2205 UTC FL165 0.65 EDR• 2213 UTC FL180-190 0.65 EDR• 2228 UTC FL220 0.75 EDR
0.65-0.75 EDR FL160-220 b/w 2205-2228 UTC0.65-0.75 EDR FL160-220 b/w 2205-2228 UTC
UA22 0.45 EDR FL370 @ 2222 UTCUA22 0.45 EDR FL370 @ 2222 UTC
In situIn situ EDR Key: 0.05 – EDR Key: 0.05 – greygrey, 0.15 – , 0.15 – purplepurple, 0.25 – , 0.25 – blueblue, 0.35 – , 0.35 – greengreen, 0.45 – , 0.45 – yellowyellow,, 0.55 – 0.55 – orangeorange, 0.65 – , 0.65 – redred, 0.75 – , 0.75 – pinkpink
GOES 8/25/2005 2225 UTC
In situIn situ EDR Key: 0.05 – EDR Key: 0.05 – greygrey, 0.15 – , 0.15 – purplepurple, 0.25 – , 0.25 – blueblue, 0.35 – , 0.35 – greengreen, 0.45 – , 0.45 – yellowyellow,, 0.55 – 0.55 – orangeorange, 0.65 – , 0.65 – redred, 0.75 – , 0.75 – pinkpink
UA22 0.45 EDR FL370 @ 2222 UTCGOES 8/25/2005 2225 UTC
UA22 T -51C / Sat CTT -42C
UA22 T -50CUA176 T -53C
UA22 FL370
UA176 FL380-390 / Sat CTT -44C
In situIn situ EDR Key: 0.05 – EDR Key: 0.05 – greygrey, 0.15 – , 0.15 – purplepurple, 0.25 – , 0.25 – blueblue, 0.35 – , 0.35 – greengreen, 0.45 – , 0.45 – yellowyellow,, 0.55 – 0.55 – orangeorange, 0.65 – , 0.65 – redred, 0.75 – , 0.75 – pinkpink
UA22 0.45 EDR FL370 @ 2222 UTCGOES IR 8/25/2005 2225 UTC
UA22 FL370
UA176 FL380-390
In situIn situ EDR Key: 0.05 – EDR Key: 0.05 – greygrey, 0.15 – , 0.15 – purplepurple, 0.25 – , 0.25 – blueblue, 0.35 – , 0.35 – greengreen, 0.45 – , 0.45 – yellowyellow,, 0.55 – 0.55 – orangeorange, 0.65 – , 0.65 – redred, 0.75 – , 0.75 – pinkpink
UA22 0.45 EDR FL370 @ 2222 UTCRadar Reflect. 8/25/2005 2225 UTC
• Southern cases– UA8160 2205-2206 UTC 0.65 EDR– UA354 2213-2214 UTC 0.65 EDR– UA252 2227-2228 UTC 0.75 EDR
20050825 CO
UA8160 0.65 EDR @ 2205-2206
UA8160 FL160-180
In situIn situ EDR Key: 0.05 – EDR Key: 0.05 – greygrey, 0.15 – , 0.15 – purplepurple, 0.25 – , 0.25 – blueblue, 0.35 – , 0.35 – greengreen, 0.45 – , 0.45 – yellowyellow,, 0.55 – 0.55 – orangeorange, 0.65 – , 0.65 – redred, 0.75 – , 0.75 – pinkpink
GOES 8/25/2005 2203 UTC
UA8160 0.65 EDR @ 2205-2206
In situIn situ EDR Key: 0.05 – EDR Key: 0.05 – greygrey, 0.15 – , 0.15 – purplepurple, 0.25 – , 0.25 – blueblue, 0.35 – , 0.35 – greengreen, 0.45 – , 0.45 – yellowyellow,, 0.55 – 0.55 – orangeorange, 0.65 – , 0.65 – redred, 0.75 – , 0.75 – pinkpink
Radar Reflect. 8/25/2005 2203 UTC
UA354 0.65 EDR @ 2213-2214
UA354 FL160-210
In situIn situ EDR Key: 0.05 – EDR Key: 0.05 – greygrey, 0.15 – , 0.15 – purplepurple, 0.25 – , 0.25 – blueblue, 0.35 – , 0.35 – greengreen, 0.45 – , 0.45 – yellowyellow,, 0.55 – 0.55 – orangeorange, 0.65 – , 0.65 – redred, 0.75 – , 0.75 – pinkpink
GOES 8/25/2005 2215 UTC
UA354 0.65 EDR @ 2213-2214
In situIn situ EDR Key: 0.05 – EDR Key: 0.05 – greygrey, 0.15 – , 0.15 – purplepurple, 0.25 – , 0.25 – blueblue, 0.35 – , 0.35 – greengreen, 0.45 – , 0.45 – yellowyellow,, 0.55 – 0.55 – orangeorange, 0.65 – , 0.65 – redred, 0.75 – , 0.75 – pinkpink
Radar Reflect. 8/25/2005 2215 UTC
UA252 0.65 EDR @ 2228
UA252 FL160-220
In situIn situ EDR Key: 0.05 – EDR Key: 0.05 – greygrey, 0.15 – , 0.15 – purplepurple, 0.25 – , 0.25 – blueblue, 0.35 – , 0.35 – greengreen, 0.45 – , 0.45 – yellowyellow,, 0.55 – 0.55 – orangeorange, 0.65 – , 0.65 – redred, 0.75 – , 0.75 – pinkpink
GOES 8/25/2005 2225 UTC
UA252 0.65 EDR @ 2228
In situIn situ EDR Key: 0.05 – EDR Key: 0.05 – greygrey, 0.15 – , 0.15 – purplepurple, 0.25 – , 0.25 – blueblue, 0.35 – , 0.35 – greengreen, 0.45 – , 0.45 – yellowyellow,, 0.55 – 0.55 – orangeorange, 0.65 – , 0.65 – redred, 0.75 – , 0.75 – pinkpink
Radar Reflect. 8/25/2005 2225 UTC
20050916 CO
• UA579 2331-2332 UTC FL240-260 0.55 EDR• UA729 2320-2323 UTC FL220-190 0.35 EDR
UA579 0.55 EDR @ 2331-2332 FL240-260
UA579UA729 peak EDR 0.35 @ 2320-2323 FL220-190
In situIn situ EDR Key: 0.05 – EDR Key: 0.05 – greygrey, 0.15 – , 0.15 – purplepurple, 0.25 – , 0.25 – blueblue, 0.35 – , 0.35 – greengreen, 0.45 – , 0.45 – yellowyellow,, 0.55 – 0.55 – orangeorange, 0.65 – , 0.65 – redred, 0.75 – , 0.75 – pinkpink
GOES 9/16/2005 2333 UTC
20050809 VA’s
• UA305 1232-1233 UTC FL340 0.55-0.45 EDR
UA305 0.55 EDR @ 1233 FL340 0.45 EDR @ 1232 FL350
UA305
In situIn situ EDR Key: 0.05 – EDR Key: 0.05 – greygrey, 0.15 – , 0.15 – purplepurple, 0.25 – , 0.25 – blueblue, 0.35 – , 0.35 – greengreen, 0.45 – , 0.45 – yellowyellow,, 0.55 – 0.55 – orangeorange, 0.65 – , 0.65 – redred, 0.75 – , 0.75 – pinkpink
GOES 8/9/2005 1215 UTC
UA305 0.55 EDR @ 1233 FL340 0.45 EDR @ 1232 FL350
In situIn situ EDR Key: 0.05 – EDR Key: 0.05 – greygrey, 0.15 – , 0.15 – purplepurple, 0.25 – , 0.25 – blueblue, 0.35 – , 0.35 – greengreen, 0.45 – , 0.45 – yellowyellow,, 0.55 – 0.55 – orangeorange, 0.65 – , 0.65 – redred, 0.75 – , 0.75 – pinkpink
GOES 8/9/2005 1245 UTC
UA305 0.55 EDR @ 1233 FL340 0.45 EDR @ 1232 FL350
In situIn situ EDR Key: 0.05 – EDR Key: 0.05 – greygrey, 0.15 – , 0.15 – purplepurple, 0.25 – , 0.25 – blueblue, 0.35 – , 0.35 – greengreen, 0.45 – , 0.45 – yellowyellow,, 0.55 – 0.55 – orangeorange, 0.65 – , 0.65 – redred, 0.75 – , 0.75 – pinkpink
Radar Reflect. 8/9/2005 1235 UTC
20050805 N. IN
• UA452 0239 UTC FL370 0.25 EDR• UA838 0246 UTC FL390 0.35 EDR
In situIn situ EDR Key: 0.05 – EDR Key: 0.05 – greygrey, 0.15 – , 0.15 – purplepurple, 0.25 – , 0.25 – blueblue, 0.35 – , 0.35 – greengreen, 0.45 – , 0.45 – yellowyellow,, 0.55 – 0.55 – orangeorange, 0.65 – , 0.65 – redred, 0.75 – , 0.75 – pinkpink
UA838
UA452
GOES IR 8/5/2005 0240 UTCUA838 0.35 EDR @ 0246 FL390 UA452 0.25 EDR @ 0239 FL370
In situIn situ EDR Key: 0.05 – EDR Key: 0.05 – greygrey, 0.15 – , 0.15 – purplepurple, 0.25 – , 0.25 – blueblue, 0.35 – , 0.35 – greengreen, 0.45 – , 0.45 – yellowyellow,, 0.55 – 0.55 – orangeorange, 0.65 – , 0.65 – redred, 0.75 – , 0.75 – pinkpink
Radar Reflect. 8/5/2005 0240 UTCUA838 0.35 EDR @ 0246 FL390 UA452 0.25 EDR @ 0239 FL370
In situIn situ EDR Key: 0.05 – EDR Key: 0.05 – greygrey, 0.15 – , 0.15 – purplepurple, 0.25 – , 0.25 – blueblue, 0.35 – , 0.35 – greengreen, 0.45 – , 0.45 – yellowyellow,, 0.55 – 0.55 – orangeorange, 0.65 – , 0.65 – redred, 0.75 – , 0.75 – pinkpink
Issues• Comparing AC measured temperature to satellite cloud
top temperature– Cloud top temperature uncertainties – how accurate are they?– Temperature inversions - can be deceiving– AC under an anvil – how do we identify?– Timing of satellite image and in situ report – not always well
matched
• Compare cases to MODIS imagery• Expand to Summer 2006• Look at Winter 2005 cases in Southeast U.S.• Examine derived indices to look for good CIT indicators
Future Work
