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-NF27 is located on a steep slope on the south sidewall of the Inn Valley. The site is characterized by a relatively homogeneous and approximately 400-m long stretch of alpine meadow, with a line of trees to either side of the slope at a distance of about 70 m. A forest starts about 250 m farther up the slope and a small road crosses the slope immediately below the station. The 6-m high tower is a full energy-balance station and is instrumented with two levels of turbulence measurements (one level before September 2017).

Site characteristics

Coordinates: 47.28755˚N, 11.63122˚E (UTM: 698958.75 E, 5240477.18 N)

Altitude: 1009 m MSL

Slope angle: 27˚

Slope orientation: 1˚

Surface characteristics: alpine meadow

Status: operational since August 2013 (the station was not running between 2 November 2016 and 04 September 2017)

Power supply: solar panel

Datalogger: CR1000

History/logbook: logbook and data availability

Instrumentation

Instrument	Height	Serial number	Notes
Turbulence
CSAT3	1.5 m	2293	Since 05 Sep 2017 Angle to true north: 260˚
CSAT3	6.8 m	2293	until 02 Nov 2016 Angle to true north: 260˚
Campbell KH20	6.8 m	1698	until 02 Nov 2016 Path length: 0.01267 m Path separation: 0.17 m xkw: -0.187 ln(mV)m3/g Intercept: 3258 mV
Irgason	7.08 m	1343	since 05 Sep 2017 Angle to true north: 260˚
Temperature/Humidity
Rotronic HC2-S3	6.83 m
Wind
Anderaa cup anemometer	1.47 m	Anderaa 1284
Anderaa cup anemometer	2.62 m	unreadable
Anderaa cup anemometer	5.33 m	Anderaa 1285
Anderaa windvane	1.51 m	W200P
Pressure
Setra 278		4991772	in logger box
Precipitation/Snow
SR50A	1.20 m	CS7212(1019)
Rain gauge			16 Nov 2018 - 21 Jan 2019
Radiation
CNR4	2.00 m	110705	SWd: 13.05 uV/Wm2 SWu: 10.06 uV/Wm2 LWd: 13.26 uV/Wm2 LWu: 13.72 uV/Wm2
Soil
Heat Flux Plate HFP01	10 cm	13619	60.74 uV/Wm2
Trime PICO64	5 cm	35250
Campbell 107 Temp probe	2 cm
Campbell 107 Temp probe	5 cm
TDT Soil moisture	7 cm

Datasets

RAWDATA since 2017

Uncorrected 1-min raw data since Sep 2017, no quality checks applied

RAWDATA until 2016

Uncorrected 1-min raw data until Nov 2016, no quality checks applied

RAIN

Uncorrected 1-min precipitation and snow depth 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

FLUXL1AND2 since 2017

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.

FLUXL1 until 2016

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 = (-4.3574e-06*jd^2+0.0016*jd-0.0061) for jd = 1 Jan - 31 Dec