HATPRO (Humidity And Temperature PROfiler) is a passive microwave radiometer manufactured by Radiometer Physics GmbH installed at the Forschungszentrum Jülich as part of JOYCE. It measures brightness temperatures at 7 channels along the slope of the water vapor absorption line at 22 GHz and at 7 channels along the slope of the oxygen absorption complex at 60 GHz with allow the retreival of integrated water vapor (IWV), cloud liquid water path (LWP) as well as tropospheric and humidity temperature profiles.
Zenith measurements alternate with RHI towards the north and PPI scans at 30 degrees elevation. Scan patterns are partially synchronized with the neighbouring cloud radar. Additionally, regular elevation scans within provide high-quality temperature profiles in the boundary layer. Attached to the side, it also includes two broadband infrared pyrometers, sensitive to water vapor, low-LWP (< 50 gm-2) liquid clouds as well as ice clouds. An automatic weather station complements the measurements with ambient temperature, rel. humidity, wind and precipitation observations.
The following data products are provided via the SAMD database. If you would like to have additional data or recent data that have not been uploaded to SAMD yet, please fill the data request sheet and send it to info@joyce.cloud
Dataset | Temporal resolution | File size | Filename | Retrieval / Remarks |
---|---|---|---|---|
Level 1 | ||||
Brightness temperatures 14 channel microwave | 1 second | 1 file per day (11-13 MB) | sups_joy_mwr00_l1_tb_v00_YYYYMMDDHHMMSS.nc | |
Brightness temperatures 14 channel microwave, 6 elevation angles | 15 minutes | 1 file per day (0.07 MB) | sups_joy_mwr00BL_l1_tb_v00_YYYYMMDDHHMMSS.nc | |
Brightness temperatures 2 channel infrared | 1 second | sups_joy_mwr00_l1_tb_v00_YYYYMMDDHHMMSS.nc | included in microwave brightness temperature file | |
Level 2 | ||||
Integrated water vapor (IWV) | 1 second | 1 file per day (3-4 MB) | sups_joy_mwr00_l2_prw_v00_YYYYMMDDHHMMSS.nc | Multivariate linear retrieval based on radiosoundings from De Bilt |
Cloud liquid water path (LWP) | 1 second | 1 file per day (3-4 MB) | sups_joy_mwr00_l2_clwvi_v00_YYYYMMDDHHMMSS.nc | Multivariate linear retrieval based on radiosoundings from De Bilt including clear sky offset correction |
Temperature profiles (from zenith pointing) | 1 second | 1 file per day (25-30 MB) | sups_joy_mwr00_l2_ta_v00_YYYYMMDDHHMMSS.nc | Multivariate linear retrieval based on radiosoundings from De Bilt |
Temperature profiles (from elevation scans) | 1 second | 1 file per day | sups_joy_mwr00BL_l2_ta_v00_YYYYMMDDHHMMSS.nc | Multivariate linear retrieval based on radiosoundings from De Bilt |
Humidity profiles (from zenith pointing) | 1 second | 1 file per day (25-30 MB) | sups_joy_mwr00_l2_ta_v00_YYYYMMDDHHMMSS.nc | Multivariate linear retrieval based on radiosoundings from De Bilt |
Current observations at quicklook archive
Since 2024, JOYHAT is the current HATPOR
From 2010-2024, TOPHAT has been the standard HATPRO instrument at JOYCE. It is from the second generation (G2) of HATPRO microwave radiometers and was upgraded in 2016 to the latest receiver generation (G5). After 2024 TOPHAT continues to be operated at JOYCE for testing and comparison.
From 2008 to 2010, SUNHAT was operated at JOYCE. It is a HATPRO of the first generation (built in 2005). FOGHAT is another Generation 5 radiometer and mainly used in measurement campaigns.
Instrument name | current location | Generation | features |
---|---|---|---|
JOYHAT | JOYCE | G5 | azimut scanning, 1 IR radiometer |
TOPHAT | Cologne | G5 (upgraded from G2) | azimut scanning, 2 IR radiometers |
SUNHAT | campaigns | G1 | |
FOGHAT | campaigns | G5 | azimut scanning, 1 IR radiometer |
HATPRO-TOPHAT installed at Jülich with two IR Pyrometers and the automatic weather station in front
Parameter | Specification |
---|---|
Receiver 1 (R1) | water vapor and liquid water absorption |
Frequencies (R1) [GHz] | 22.24, 23.04, 23.84, 25.44, 26.24, 27.84, 31.40 |
Channel band-widths (R1) [MHz] | 230, 230, 230, 230, 230, 230, 230 |
Optical Resolution (R1) (HPBW) | 3.3°-3.7° |
Temporal Resolution | 1 to 2 seconds |
Receiver 2 (R2) | oxygen absorption |
Frequencies (R2) [GHz] | 51.26, 52.28, 53.86, 54.94, 56.66, 57.30, 58.00 |
Channel band-widths (R2)[MHz] | 230, 230, 230, 230, 600, 1000, 2000 |
Optical Resolution (R2) (HPBW) | 2.2°- 2.5° |
Pointing Resolution (R2) | 0.6° (elevation), 0.1° (azimuth) |
Side-lobe level | < -30 dBc |
Infrared pyrometers | 11.1 μm, 12.0 μm, accuracy 1.0 Kelvin |
Size | 630 mm x 360 mm x 900 mm |
Power Consumption | <120 W (350 W peak) + dew blower 130 W |
Weight | 60 kg |
Manufacturer | Radiometer Physics GmbH |