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-SF1 is a low-angle slope site, located on a small plateau on the north sidewall of the Inn Valley. The station is situated next to an approximately 55-cm high embankment that runs north-south, with a small 2.6-m high shed just south of the station. The 6-m high tower is instrumented with one sonic anemometer and a Krypton hygrometer at approximately 7 m AGL.

Site characteristics

Coordinates: 47.3165˚N, 11.6162˚E (UTM: 697742.32 E, 5243617.99 N)

Altitude: 829 m MSL

Slope angle: 1˚

Slope orientation: 53˚

Surface characteristics: alpine meadow

Status: operational since April 2013

Power supply: solar panel

Datalogger: CR1000

History/logbook: logbook and data availability

Instrumentation

Instrument	Height	Serial number	Notes
Turbulence
CSAT3	6.75 m	2283	Angle to true north: 95˚
Campbell KH20	6.75 m	1299	until 23 Nov 2017 Path length: 0.01393 m Path separation: 0.135 m xkw: -0.197 ln(mV)m3/g Intercept: 3063 mV 23 Nov 2017 - 25 Jun 2020 Path length: 0.01222 m Path separation: 0.135 m xkw: -0.188 ln(mV)m3/g Intercept: 3406 mV
Irgason	6.75 m	1691	since 26 Jun 2020 Angle to true north: 95°
Temperature/Humidity
Rotronic HC2-S3	6.18 m
Pressure
Setra 278	1.20 m	4991770	in logger box
Radiation
CNR4	1.80 m	173043	SWd: 12.09 uV/Wm2 SWu: 12.31 uV/Wm2 LWd: 12.18 uV/Wm2 LWu: 13.10 uV/Wm2
Soil
Heat Flux Plate HFP01	10 cm	15454	63.38 uV/Wm2
Trime Pico 64	5 cm	42154
Campbell 107 Temp probe	5 cm
Campbell 107 Temp probe

Datasets

RAWDATA

Uncorrected 1-min raw data, no quality checks applied

FLUXL1

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 = (-1.7733e-05*jd^2+0.0064*jd-0.3279) for jd = 3 Mar - 26 Oct and wind direction = ]330.35, 150]

d = (0.8607*log(jd)-3.1644) for jd = 1 Jun - 30 Sep and wind direction = ]150, 330.35]