PBL HEIGHT ESTIMATION IN MODELS AND OBSERVATIONS
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PBL HEIGHT ESTIMATION IN MODELS AND OBSERVATIONS How good is PBL depth in the models? How we can verify it? - internal model parameter - no good measurements on regular basis After change to ACM2 + Ri Number (no fluxes) NAM: TKE scheme CMAQ: Critical Richardson Number (with fluxes) RADIOSONDES: Critical Richardson number (surface fluxes set to zero) Post VERIFICATION Ri CR = 0.25 (Vogelezang and Holtslag, 1996)
Transcript of PBL HEIGHT ESTIMATION IN MODELS AND OBSERVATIONS
PBL HEIGHT ESTIMATION IN MODELS AND OBSERVATIONSHow good is PBL depth in the models?How we can verify it?
- internal model parameter- no good measurements on regular basis
After change to ACM2
+Ri Number(no fluxes)
NAM:TKE scheme
CMAQ:Critical Richardson
Number (with fluxes)
RADIOSONDES:Critical Richardson
number (surface fluxes set to zero)
Post
VERIFICATION
RiCR = 0.25 (Vogelezang and Holtslag, 1996)
PBL Verification System
RAOB
BUFR format
Observations Model outputNAM
GFS
Grib Format
Forecast Verification System
PBL height
Statistics
PBL calculation
Profiler
Aircraft
TKE PBL
Mix Layer Ht
Ri PBL/fluxes
Ri PBL/no fluxes
CMAQ
800
1120
480
Eastern US
July 20-27, 2006
Central US
PBL Depth July 1 – Sep 2, 2007
Eastern USWestern US
TKE PBL
RI PBL
RAOBS
TKE, RI and MODRI PBL depth
TKE PBL is higherSome features exist only in TKE PBL
TKE, RI and MODRI PBL depth differences
CA: MODRI PBL is higher than RI PBL, and at some locationsIt is higher than TKE PBL
TKE PBLRI PBLMODRI PBL
TKE PBLRI PBLMODRI PBL
Over-prediction – low PBL?
PBL Verification for retrospective tests: July 20-27, 2006
TKE PBL
RI PBL
RAOBS
MX Height
Western US
800
1120
480
2000
2400
2800
1600
1400
1800
2200
Eastern US
TKE PBLoverprediction
Central US
12 hr PBL verification from launcher runs; Valid 00z
Oakland CA San Diego CA
July 20-27, 2006
TexAQS 2006
RAOBS:SHREVEPORT, LA
Profiler:Lonlview, TX
TexAQS 2006
(Measurements provided by Jim Wilczak)
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