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-NF10 is located on the south sidewall of the valley, on a relatively homogeneous, 500-m long slope. The site is dominated by grassland, with a forest approximately 300 m farther up the slope. The station is situated on a small mound, with the terrain dropping off to the west (approximately 85 cm) and east (approximately 130 cm) at slightly different angles. The 6-m high tower is a full energy-balance station and is instrumented with one level of turbulence measurements.

Site characteristics

Coordinates: 47.299754˚N, 11.672969˚E (UTM: 702069.47 E, 5241939.92 N)

Altitude: 930 m MSL

Slope angle: 10˚

Slope orientation: 314˚

Surface characteristics: alpine meadow

Status: operational since September 2012

Power supply: solar panel

Datalogger: CR1000

History/logbook: logbook and data availability

Instrumentation

Instrument	Height	Serial number	Notes
Turbulence
CSAT3	5.65 m	2296	Angle to true north: 290˚
Campbell KH20	5.65 m	1699	until 09 Nov 2017 Path length: 0.01217 m Path separation: 0.133 m xkw: -0.183 ln(mV)m3/g Intercept: 3443 mV 09 Nov 2017 - 24 Jun 2020 Path length: 0.0199 m Path separation: 0.133 m xkw: -0.181 ln(mV)m3/g Intercept: 3310 mV
Irgason	5.85 m	1693	since 25 Jun 2020 Angle to true north: 290˚
Temperature/Humidity
Rotronic HC2-S3	5.33 m
Pressure
Setra 278		4969789	in logger box
Radiation
CNR4	1.36 m	121149	SWd: 14.12 uV/Wm2 SWu: 14.92 uV/Wm2 LWd: 8.37 uV/Wm2 LWu: 9.40 uV/Wm2
Soil
Heat Flux Plate HFP01	10 cm	7565	62.22 uV/Wm2
Trime PICO64	5 cm	34021

Datasets

RAWDATA

Uncorrected 1-min raw data, no quality checks applied

RADIAT1

1-min radiation data after applying the respective calibration coefficients to the uncorrected 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 = (-7.3987e-06*jd^2+0.0027*jd+0.0196) for jd = 1 Jan - 31 Dec