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GLASS “LOcal-COupled” Project:“LOCO”
Christa D. Peters-LidardNASA’s Goddard Space Flight Center (GSFC)
Hydrological Sciences Branch
Greenbelt, MD USA
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Outline
• Motivation• Strawman Proposal• Case Study Sites
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Motivation
• Quantify surface/boundary layer feedbacks on surface fluxes and states (“Strength of the coupling”)
• Assess need for surface/boundary layer feedbacks in land surface data assimilation
• Examine propagation of sub-grid land surface heterogeneity
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BL Feedbacks Change FluxesS
ens
ible
Hea
t Flu
x (W
m-2)
Fro
m M
OS
AIC
Mo
de
l
0
600 UncoupledCoupled 1-D PBL
1-3 AUG 1998, (58N,130W)
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LSMs Operate on Patches
• Type A (Shuttleworth, 1988) patches generate Internal Boundary Layers which “Blend” above a certain height (e.g., Blyth et al., 1993)
• Blending height a function of patch size L
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History
• Workshop in De Bilt, Apr 2002. – Summary by Bart van den Hurk
et al.
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Strawman Proposal: LOCO• Phase 1: Synthetic column –extract
column boundary conditions from model
• Phase 2: Past Field Campaigns– PILPS sites: Cabauw, FIFE, Boreas,
others?– GABLS sites: which?– Others: SGP/ARM/IHOP, LBA, Wangara,
others?
• Phase 3: Future Field Campaigns– Upcoming Sites: HEAT (Houston, TX)-
Urban; others?– New Site(s): Design “local coupled
testbed(s)”
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N
Case Study 1: Southern Great Plains ’97 Experiment (SGP97)
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SGP ’97 Tethersonde OpsPeters-Lidard and Davis, JHM, 2000
0700-1100: < 1 hr
1230-1700: 1.5 hrs
6/18,19,22,25-29
7/2-6,14-16
~2-5 m
10 s
No wind >10m/s
Launch
Frequency
Dates
Vertical Spatial
Resolution
Sampling Interval
Notes
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Sample Data for 6/22/97 (Julian Day 173)
0
50
100
150
200
250
300
350
400
8 9 10 11 12 13 14
Specific Humidity (g/kg)
Heigh
t AGL
(m)
Tethersonde@1207 Radiosonde@1126 Tethersonde@1235
Sample Data for 6/22/97 (Julian Day 173)
0
50
100
150
200
250
300
350
400
292 294 296 298 300 302 304
Potential Temperature (K)
Heigh
t AGL
(m)
Tethersonde@1207 Radiosonde@1126 Tethersonde@1235
Potential Temperature () Specific Humidity (q)Tethersonde@1207 Tethersonde@1207Tethersonde@1235 Tethersonde@1235Radiosonde@1126Radiosonde@1126
Morning Transition6/22/97 (Day 173)
Stable surface layer profile
Moisture advection due
to GP LLJ
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Mixed Layer Analysis:Identifies “Non-Local” Effects
)1(''
A
z
xu
tw
Entrainment Parameter, A
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July 5 H Predictions; A=0.2
-200
-100
0
100
200
300
400
500
600
700
0000 0600 1200 1800 2400
Time (GM T)
Sen
sibl
e H
eat
Flu
x, H
(W
/m2 )
Average Surface ECOR
GSFC/U ofA Surface ECOR
ARM/CA RT Surface ECOR
Twin Otter Aircraft
Long EZ Aircraft
Conservation A verage; Ar=0.2
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SGP ’97 H Predictions; A=0.2
-200
-100
0
100
200
300
400
500
600
700
-200 -100 0 100 200 300 400 500 600 700
Measured Sensible Heat Flux, H (W/m2)
Pre
dict
ed S
ensi
ble
Hea
t F
lux,
H (
W/m
2 )
H (Direct-TR)
H (Direct-RR)
H (Swiatek)
H (None)
1:1
(a)
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RMS (W/m2)
52
321
Bias (W/m2)
-15
-150
H
LE*
*Advection of moisture (presumably by LLJ)
SGP ’97 Flux Prediction Statistics
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Case Study 2: Washita ’941-D Boundary Layer Model
MM5/GSPBL/KF/TOPLATS
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N
8/18: Wet Day, Strongly Forced
SLAB TOPLATSOBS
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N
SLAB
8/23: Dry Day: Weakly Forced
TOPLATSOBS
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IBL Can Affect Entire PBLS
ens
ible
Hea
t Flu
x (W
m-2)
TOPLATSMM5-SLAB
0
500
1000
1500
2000
2500
3000
0 5 10 15
Hour in Simulation (from 1200 Z, Aug 23, 1994)
PB
L H
eig
ht
(m A
GL
)
Zpbl-TOPLATSZpbl-SLABObserved
350
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Case Study 3: Ozone Exceedance Houston/Galveston, Texas, USA
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Case Study: August, 1998
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Case Study: August, 1998
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Case Study: August, 1998
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Case Study: August, 1998
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Cloud Initiation:Sea-breeze FrontMM5/TOPLATS MM5/SLAB
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Conclusions
– Non-local effects such as LLJ, clouds and sea-breeze fronts violate “local” assumptions, esp. humidity profiles
– Disaggregation of fluxes/states to patch level requires parameterization of IBL/PBL
– Coupled BL-LS feedbacks important