The Basel UrBan Boundary Layer Experiment (BUBBLE)
was a year-long experimental effort to investigate in
detail the boundary layer structure in the City of Basel,
Switzerland. At several sites over different surface types
(urban, sub-urban and rural reference) towers up to at least
twice the main obstacle height provided turbulence
observations at many levels. In addition, a Wind Profiler
and a Lidar near the city center were profiling the entire
lower troposphere. During an intensive observation period
(IOP) of one month duration, several sub-studies on street
canyon energetics and satellite ground truth, as well as on
urban turbulence and profiling (sodar, RASS, tethered
balloon) were performed. Also tracer experiments with
near-roof-level release and sampling were performed. In
parallel to the experimental activities within BUBBLE, a
meso-scale numerical atmospheric model, which contains a
surface exchange parameterization, especially designed for
urban areas was evaluated and further developed. Finally,
the area of the full-scale tracer experiment which also
contains several sites of other special projects during the
IOP (street canyon energetics, satellite ground truth) is
modeled using a very detailed physical scale-model in a
wind tunnel. In the present paper details of all these
activities are presented together with first results.
The Basel UrBan Boundary Layer Experiment (BUBBLE)was a year-long experimental effort to investigate indetail the boundary layer structure in the City of Basel,Switzerland. At several sites over different surface types(urban, sub-urban and rural reference) towers up to at leasttwice the main obstacle height provided turbulenceobservations at many levels. In addition, a Wind Profilerand a Lidar near the city center were profiling the entirelower troposphere. During an intensive observation period(IOP) of one month duration, several sub-studies on streetcanyon energetics and satellite ground truth, as well as onurban turbulence and profiling (sodar, RASS, tetheredballoon) were performed. Also tracer experiments withnear-roof-level release and sampling were performed. Inparallel to the experimental activities within BUBBLE, ameso-scale numerical atmospheric model, which contains asurface exchange parameterization, especially designed forurban areas was evaluated and further developed. Finally,the area of the full-scale tracer experiment which alsocontains several sites of other special projects during theIOP (street canyon energetics, satellite ground truth) ismodeled using a very detailed physical scale-model in awind tunnel. In the present paper details of all theseactivities are presented together with first results.
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