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Description

This dataset contains thermodynamic profiles retrieved from the ground-based infrared spectrometer called the ASSIST.  The ASSIST was located at the MOLRAO location at the DWD's Lindenberg site.  The primary retrieved variables are T(z), q(z), liquid water path, and effective radius.  The uncertainties of these variables are provided, as well as a full error covariance matrix.  Most of the information from the ASSIST observation is in the lowest 2 km; the cumulative degrees of freedom fields (cdfs_temperature and cdfs_watervapor) provide a quantitative description of this information with height.  The data structure follows the standard DOE Atmospheric Radiation Measurement (ARM) program's data format.  To get the time for the samples, add base_time to time_offset to get the number of seconds since 1 Jan 1970 at 00:00:00 UTC. 

Limitations: Quality: There are uncertainty profiles for all of the retrieved variables in the netCDF files.  However, the information content in the ASSIST observations decreases rapidly with height; profile quantifies above 3 km should be used with care.  Also, if the retrieved LWP > 10 g/m2, then there will be very little-to-no information on the temperature and humidity profile above the cloud base height.  I also recommend only using retrievals wherein the RMSr field is less than 8 and gamma field is less than 5. All of these variables are in the netCDF file. 
Provenance: There have been two version of these retrievals to date: v0 - this was the real-time processing during the field campaign v1 - this dataset was reprocessed to include updated calibration to the ASSIST radiance data
Comments: Variable names are not SAMD Standard conform. Processing_comment1: ASSIST data reprocessed in Dec 2021 to apply updated instrument coefficients. Processing_comment2: No RAP input for T/q. Processing_comment3: No surface met data as input. Processing_comment4: No MWR Tb data as input. Prior_dataset_comment: Radiosondes from Univ Wyoming upper air site for Lindenberg, Germany.

• Source: ASSIST, infrared spectrometer
• Descriptive Instrument location: MOLRAO location at the DWD's Lindenberg site
• Instruments altitude: 164 [m]
• Coordinates (Latitude, Longitude): 52.20885 °N 14.12151 °E
• Height: 0 - 18 [m]
• Horizontal resolution: none [m]
• Vertical resolution: 0.01 - 2 [m]
• Time resolution: 600 [s]

• PID: de.hamburg.icdc/amd.de.fval/noaa.irs00.l1.any
• Standard: ARM Data File Standard
• Project: FESSTVAL
• Level: 1
• Updated version: 01
• File format: NETCDF4
• Convention: CF-1.7 where applicable
• Average File Size Uncompressed: 24 Mb
• File name: fval_noaa_irs00_l1_any_v[VV]_[YYYYMMDDhhmmss].nc
• Start: 2021-06-08
• End: 2021-08-21

Name	Dimension	CF standard_name	long_name	Unit
clwvi	('time',)		liquid water path	g/m2
dpt	('time', 'height')		dew point temperature	C
hur	('time', 'height')		relative humidity	%
pa	('time', 'height')		derived pressure	mb
ta	('time', 'height')	temperature	temperature	C
zcb	('time',)		Cloud base height	km AGL
zsl		altitude	altitude	m above MSL

(1)NOAA Global Systems Laboratory; (2) LRtech

Dave Turner (Dave.Turner@noaa.gov), National Oceanic and Atmospheric Administration

Turner and Loehnert: Information Content and Uncertainties in Thermodynamic Profiles and Liquid Cloud Properties Retrieved from the Ground-Based Atmospheric Emitted Radiance Interferometer (AERI), (2014), doi:10.1175/JAMC-D-13-0126.1

Turner and Blumberg: Improvements to the AERIoe Thermodynamic Profile Retrieval Algorithm, (2019), doi:10.1109/JSTARS.2018.2874968

Turner and Loehnert: Ground-based temperature and humidity profiling: combining active and passive remote sensors, (2021), doi:10.5194/amt-14-3033-2021

This data is subject to the FESSTVaL data policy to be found at https://doi.org/10.25592/uhhfdm.9890  and in the SAMD Observation Data Product Standard https://doi.org/10.25592/uhhfdm.9902 .