Post on 17-Jan-2018
transcript
An urban flux tower for atmospheric turbulence and trace gas flux studies
Gunnar W. Schade, C. H. Park I. BoedekerTexas A&M University, College Station, TX
Site Description, I
Site Description, IIland use (+winds)
land cover
Hardy / Elysian Roads
Traffic Counts
Hardy (south bound) Elysian (north bound)
Quitman Road (east/west bound)
How it looks like
Tower Measurement Setup
Tower
PAR pyranometer
net radiation
Sonic
WS/WD aspirated T/RH
N
3/8’’ and 1/4“ OD PFA Tubes
Lag time ≈ 9 s
BaseBuilding
60 m
50 m
40 m
20 m
13 m Relaxed Eddy Accumulation
GC-FID
PC
Wind data (10 Hz)
w
DL
CO2 H2O slow: CO, NOx, O3
EC
gradient
Integral statistics example I
Integral statistics example II
no roughness sub-layer influence
d and z0 distributions
displacement height related to cumulative roughness element parameters
site (in)homogeneities I
site (in)homogeneities II
site (in)homogeneities III
site (in)homogeneities IV
seasonality I
winter
summer
seasonality II
weekday
weekend
VOC flux
VOC flux
Summary Operated from summers 2007 to 2009 Results very similar to previous urban
turbulence research • comfortable that site is well-suited for flux
measurements• flux data is under renewed investigation
Obtained follow-up funding• will commence this summer• expand with particle flux measurements
Acknowledgements
Houston Yellow Cab Texas A&M University startup Texas Air Research Center
Bernhard Rappenglück TCEQ