Description

The Innsbruck Box (i-Box) is a testbed for studying boundary layer processes in highly complex terrain. Designed to be a long-term "reference box" for studying the characteristics of turbulence structure and exchange processes in truly complex topography, i-Box represents an integrated approach combining three-dimensional long-term turbulence observations with high-resolution numerical modeling. The i-Box observational stations are located in the Inn Valley, an approximately northeast-southwest oriented valley in western Austria, characterized by very complex terrain with steep slopes, flat foothills, numerous side valleys, and variable land use characteristics. The locations of the core sites (six turbulence stations) were chosen to represent different topographic features in order to secure the universality of the obtained results. Further information about the i-Box project can be found in Rotach et al. (2017) and on the i-Box WIKI.

Site CS-SF8 is located in the lower part of the north sidewall. The tower is situated next to a small embankment between a concrete area and agricultural land. The 12-m high tower is instrumented with two levels of turbulence measurements.

Site characteristics

Coordinates: 47.325538˚N, 11.65247˚E (UTM: 700407.44 E, 5244745.04 N)

Altitude: 575 m MSL

Slope angle: 8˚ (28˚ directly underneath the tower)

Slope orientation: 147˚

Surface characteristics: agricultural and asphalt

Status: operational since September 2012

Power supply: AC

Datalogger: CR3000

History/logbook: logbook and data availability

Instrumentation

Instrument	Height	Serial number	Notes
Turbulence
CSAT3	6.12 m	2292	Angle to true north: 130˚
CSAT3	11.2 m	2281	Angle to true north: 130˚
Campbell KH20	11.2 m	1697	until 22 Nov 2017 Path length: 0.0121 m Path separation: 0.175 m xkw: -0.181 ln(mV)m3/g Intercept: 3442 mV
Irgason	11.2 m		since 18 Sep 2020 Angle to true north: 130˚
Temperature/Humidity
Rotronic HC2-S3	11.2 m
Pressure
Setra 278	2.0 m	4969793	in logger box within building (connected to outside via tube)

Datasets

RAWDATA

Uncorrected 1-min raw data, no quality checks applied

FLUXL1AND2

Processed turbulence data with an averaging interval of 30 min (processing was performed using EdiRe)

Processing includes despiking; double-rotation of the wind components; detrending with a recursive filter and a time constant of 200 s; and applying frequency-response corrections, heat-flux corrections for humidity effects, oxygen corrections for KH20, and WPL corrections. The datafile contains several quality flags.

ZEROPLANE

Annual cycle of zero-plane displacement height (Sfyri et al. 2018)

d = (0.8607*log(jd)-3.1644) for jd = 1 Jun - 30 Sep and wind direction = [295, 32]