# PIANO (Penetration and Interruption of Alpine foehn) - Doppler wind lidar data sets (SL74, SL75, SL88, SLXR142)

*Alexander Gohm, Maren Haid, Mathias W. Rotach*

*[Department of Atmospheric and Cryospheric Sciences (ACINN), University of Innsbruck](https://www.uibk.ac.at/acinn/)*

*Version 1 (April 2021)*

## Abstract

## DATA SET DESCRIPTION
### 1. Spatial coverage and locations
- Lidar data from PIANO field campaign
- Map of instruments in Haid et al. (2020)

| | SL74 | SL75 |SL88 | SLXR142 |
|--|--|--|--|--|
| Adress | PEMA Holding, Sterzinger Str. 1, 6020 Innsbruck | Lagerhaus, Duilenstraße 20, 6020 Innsbruck | HTL Anichstraße - HTLinn, Anichstraße 26 - 28, 6020 Innsbruck | University of Innsbruck, Innrain 52, 6020 Innbruck |
| Latitude (deg North) | 47.2660760 | 47.2533684 | 47.2649805 | 47.2639112 |
| Longitude (deg East) | 11.4011756|11.3928383 | 11.3893394 | 11.3846693 |
| Altitude (m MSL) | 629.13 | 623.79 | 584.88 | 619.64|

### 2. Temporal coverage

| | SL74 | SL75 |SL88 | SLXR142 |
|---|--------|----------|-----|---------|
|Installation period | 12 Sep 2017 - 18 Dec 2017 | 12 Sep 2017 - 18 Dec 2017 | 18 Jul 2017 - 3 Aug 2018 | 18 Sep 2017 - 17 Jul 2018 |
|Test period |12 Sep 2017 - ... | 12 Sep 2017 - ... | 18 Jul 2017 - | - |
| Scenario0 | | | |
| Scenario1 | | | |
| Scenario_split | | | |
| Scenario_christmas | | | |

### 3. Instrument details

**General**
- four scanning Doppler wind lidars; SL74, SL75, SL88 and SLXR142
- profiles of radial velocity and backscatter data scans performed in continous scanning (csm) mode and step-and-stare (ss) mode
- csm mode: coordinated PPI and RHI scans with SL75, SL74 and SLXR142 lidar;
- ss mode: 6beam (five beams with el=70 deg uniformly distributed in a cone and a sixth vertical beam) with SL88; VAD24 with 24 beams at el=70 deg uniformly distributed in a cone
- vertical stare mode: el=90 deg
- 1 Hz data with 18 m range gate height
- 10000 pulses per ray for SLXR142 lidar and 15000 pulses per ray for SL74, SL75 and SL88 lidar

**Scan scenarios and scan pattern**

**Data correction and data products**
- We provide so-called corrected “level 1” data. The data correction includes an adjustment of the azimuth angle due to instrument misalignment (a corrected azimuth angle of 0° corresponds to true north) and a correction of the range gate distance (only necessary for SLXR142).
- Additionally the naming changed compared to *raw data* and includes the name of the performed scan pattern

**CSM scan mode and effect on azimuth and elevation angle**

### 4. Data file structure

**File format**

**Zip files**

`SL74_l1` contains netCDF files of corrected SL74 data

`SL74_stare_l1` contains daily netCDF files of corrected SL74 data performed in stare mode

`SL75_l1`

`SL75_stare_l1`

`SL88_6beam_l1`contains daily netCDF files of corrected SL88 data performed in 6beam mode

`SL88_stare_l1`

`SLXR142_l1`

`SLXR142_stare_l1`

`SL74_VAD_l2` contains netCDF files of vertical profiles of horizontal winds retrieved from data of VAD24 scan pattern by SL74

`SL75_VAD_l2`

`SL88_VAD_l2`

`SLXR142_VAD_l2`

`PPI3_l2` contains netCDF files of horizontal retrievals produced from data collcted in PPI3 scan pattern

`RHISN_l2` contains netCDF files of horizontal retrievals produced from RHISN scan pattern

`RHIEW_l2` contains netCDF files of horizontal retrievals produced from RHIEW scan pattern

**SL74 level1 data**

`SL74_stare_yyyymmdd_l1.nc` contains vertical stare measurements aggregated together in one file for each day.

`SL74_vad24_l1_yyyymmdd_HHMMSS.nc` contains 24 beams equally distributed in a cone at 70° elevation conduceted in SS mode. Each beam has a aggregation period of 1 sec and a range gate length of 18 m. This scan was performed every 20 minute, i.a. three times per hour.

`SL74_ppi3_l1_yyyymmdd_HHMMSS.nc` contains multiple PPI scans performed as part of the coordinated PPI3 scan pattern. The scan was performed at nearly horizontal (el = ... deg) elevation angle for an azimuth angle of 90 deg in total (... to ... deg). As part of the scan scenario *scenario0* these PPIs were repeated 33 times each scan and for the *scenario0_split* 16 times each scan, however performed twice.

`SL74_rhiew_l1_yyyymmdd_HHMMSS.nc` contains multiple RHI scans performed as part of the coordinated RHIEW scan pattern. The scan was performed in direction of the SLXR142 lidar (az = ... deg) for an elevation angle of 90 deg in total (... to ... deg). The repetition of single RHIs within one scan file depends on the performed scan scenario. For scenario0*, the RHI scans were repeated 33 times each file, for the *scenario0_split* 16 times each file, however performed twice and for *scenario1* ... times each file.

`SL74_rhiew3_l1_yyyymmdd_HHMMSS.nc` contains multiple RHI scans performed as part of the coordinated RHIEW3 scan pattern. The scan was performed in direction of the SLXR142 lidar (az = ... deg) for an elevation angle of ... deg in total (... to ... deg). This scan pattern was only part of *scenario1* and the RHI scans are repeated ... times each file.

`SL74_rhisn3_l1_yyyymmdd_HHMMSS.nc` contains multiple RHI scans performed as part of the coordinated RHISN3 scan pattern. The scan was performed in direction of the orthogonal to the vertical plane spanned between the SL75 and the SLXR142 lidar (az = ... deg) for an elevation angle of 180 deg in total (... to ... deg). This scan pattern was only part of *scenario1* and the RHI scans are repeated ... times each file.

**SL75 level1 data**

`SL75_stare_yyyymmdd_l1.nc`
`SL75_ppi3_l1_yyyymmdd_HHMMSS.nc`
`SL75_vad24_l1_yyyymmdd_HHMMSS.nc`
`SL75_rhisn_l1_yyyymmdd_HHMMSS.nc`
`SL75_rhiew3_l1_yyyymmdd_HHMMSS.nc`
`SL75_rhisn3_l1_yyyymmdd_HHMMSS.nc`

**SL88 level1 data**
`SL88_stare_yyyymmdd_l1.nc`
`SL88_6beam_yyyymmdd_l1.nc`

**SLXR142 level1 data**

`SLXR142_stare_yyyymmdd_l1.nc`
`SLXR142_ppi3_l1_yyyymmdd_HHMMSS.nc`
`SLXR142_vad24_l1_yyyymmdd_HHMMSS.nc`
`SLXR142_rhisn_l1_yyyymmdd_HHMMSS.nc`
`SLXR142_rhiew_l1_yyyymmdd_HHMMSS.nc`
`SLXR142_rhiew3_l1_yyyymmdd_HHMMSS.nc`
`SLXR142_rhisn3_l1_yyyymmdd_HHMMSS.nc`

**SL75 VAD level 2 data**

`SL75_vad_l2_yyyymmdd.nc`

**SL74 VAD level 2 data**

`SL74_vad_l2_yyyymmdd.nc`

**SLXR142 VAD level 2 data**

`SLXR142_vad_l2_yyyymmdd.nc`

**SL88 VAD level 2 data**

`SL88_vad_l2_yyyymmdd.nc`

**PPI3 data**

`ppi3_l2_yyyymmdd_HH.nc`

**RHISN data**

`rhisn_l2_yyyymmdd_HH.nc`

**RHIEW data**

`rhiew_l2_yyyymmdd_HH.nc`

### 5. Software, publications and related data sets

### 6. Contact

### 7. References
Haid M., Gohm A., Umek L., Ward H. C., Muschinski T., Lehner L., Rotach M. W.: Foehn–cold pool interactions in the Inn Valley during PIANO IOP2. Quarterly Journal of Royal Meteorological Society, 146(728), 1232-1263, https://doi.org/10.1002/qj.3735

Umek L., Gohm A., Haid M., Ward H. C., Rotach M. W.: Large‐eddy simulation of foehn–cold pool interactions in the Inn Valley during PIANO IOP 2. Quarterly Journal of Royal Meteorological Society, 146(735), 944-982, https://doi.org/10.1002/qj.3954

Muschinski T., Gohm A., Haid M., Umek L., Ward H. C.:
Spatial heterogeneity of the Inn Valley Cold Air Pool during south foehn: Observations from an array of temperature loggers during PIANO. Meteorologische Zeitschrift, https://doi.org/10.1127/metz/2020/1043