Air-Sea Interaction in NYC: Air-Sea Interaction in NYC: Urbanized Mesoscale Modeling for CB Urbanized Mesoscale Modeling for CB Threats Threats with Alan Blumberg, SIT & Bob Bornstein, SJSU Julie Pullen & Teddy Holt Julie Pullen & Teddy Holt Naval Research Laboratory Naval Research Laboratory Monterey, CA Monterey, CA 03 UTC 09 UTC 15 UTC 24 UTC
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Air-Sea Interaction in NYC: Urbanized Mesoscale Modeling for CB Threats Air-Sea Interaction in NYC: Urbanized Mesoscale Modeling for CB Threats with Alan.
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Air-Sea Interaction in NYC: Air-Sea Interaction in NYC: Urbanized Mesoscale Modeling for CB Urbanized Mesoscale Modeling for CB ThreatsThreats
with Alan Blumberg, SIT
& Bob Bornstein, SJSU
Julie Pullen & Teddy HoltJulie Pullen & Teddy HoltNaval Research LaboratoryNaval Research LaboratoryMonterey, CAMonterey, CA
Local SST gradients due to urban Local SST gradients due to urban discharges (such as power plants), discharges (such as power plants), river discharges and coastally river discharges and coastally upwelled water can alter overlying upwelled water can alter overlying atmosphere (e.g., sea breeze fronts)atmosphere (e.g., sea breeze fronts)
Building morphology and Building morphology and heating effects from urban heating effects from urban areas impact the weather areas impact the weather and contaminant dispersionand contaminant dispersion
Mesoscale OverviewMesoscale Overview COAMPSCOAMPS®®: data-assimilating modeling system: data-assimilating modeling system 5 nests (36 km to 0.44 km)5 nests (36 km to 0.44 km) urbanization and time-varying (hourly) realistic SSTs on urbanization and time-varying (hourly) realistic SSTs on
nests 4 (1.33 km) & 5 (0.44 km)nests 4 (1.33 km) & 5 (0.44 km)
sea breeze forecast (nest 5)
0
hurb (m)
50
150
200
100
N S0
0.2
0.1
Lower Manhattan
Midtown
StatenIsland
58.5 km
North-South cross-section
Bu
ild
ing
he
igh
t A
GL
(km
)
N
S
Midtown Manhattan
BrooklynStatenIsland
Model Configuration
nest 1 (36 km) nest 2 (12 km) nest 3 (4 km) nest 4 (1.33 km) nest 5 (0.44 km)
1
2
34
Nests 4 & 5 use an urban canopy parametrization and hourly time-varying model-derived SSTs
Observed SST
nest 4 (1.33 km)
nest 5 (0.444 km)
control SST
control SST
model SST
model SST
Realistic High-Resolution SSTs
13 UTC July 4 to 12 UTC July 9
Upwelling-favorable Wind Regime
Plumb Beach
ALSN6Sandy Hook
Wind speed (m/s) N mean standard dev
Plumb Beachobserved
uses control SSTuses model SST
120120120
2.995.154.89
1.351.771.60
Sandy Hookobserved
uses control SSTuses model SST
120120120
4.564.944.72
2.011.551.54
ALSN6observed
uses control SSTuses model SST
120120120
6.387.186.80
2.432.552.64
Wind speed (m/s) MB RMSE CC
Plumb Beachuses control SSTuses model SST
-2.16-1.90
2.792.50
0.380.39
Sandy Hookuses control SSTuses model SST
-0.38-0.16
1.861.75
0.490.54
ALSN6uses control SSTuses model SST
-0.80-0.42
2.282.25
0.630.62
13 UTC 4 July - 12 UTC 9 July, 2004 (5 days)
Model/Observation Statistics
Modification of Urban Heat Island
Offshore Wind Regime
COAMPS® NYC Nest 5 (0.444 km)
10-m winds; 2-m air temperature (C)12-h forecast valid 00 UTC 5 Aug 2004