Reflectivities of multi-year X-band weather radar observations in Hamburg (LAWR HHG level 1 dbz) (Version 1)

hdl:21.14106/300e9fffd83deace9140ee830bab7eb57177c83a

Burgemeister, Finn; Clemens, Marco; Ament, Felix

Dataset Group
Active Remote SensingatmosphereLocal observationsLong term observationsobservational dataradar
Summary
An operational, single-polarized X-band weather radar (WRX) provides measurements in Hamburg’s city center since 2013. This local area weather radar (LAWR) is located on the rooftop of the high-rise building "Geomatikum" in Hamburg (HHG), which is the location of the Meteorological Institute of the Universität Hamburg. The radar operates at one elevation angle with a high temporal 30 s, range 60 m, and sampling 1° resolution refining observations of the German nationwide C-band radars within a 20 km scan radius.

Several sources of radar-based errors were adjusted gradually improving the radar reflectivity, e.g. the radar calibration, alignment, noise, non-meteorologial echoes. This data set group includes monthly data sets of hourly netCDF-files of the radar reflectivity factor (dbz) in level 1. The unit is dBZ. An attenuation correction is not applied. The measurement data is available on the original polar grid (360 azimuth angles and 333 range gates) with it's center at the radar location. Latitude and longitude coordinates are included within the files. Three quality variables "clutter_mask", "noise_level", and "calibration_coefficient" are included. The clutter mask (clutter_mask) indicates interpolated values due to the removal of non-meteorological echoes (clutter). The noise level (noise_level) was removed to reduce noise from the measurements. The calibration coefficient (calibration_coefficient) was applied to the radar reflectivity and corrects a bias to MRR observations. The radar reflectivity was evaluated to measurements of micro rain radars (MRR).

These data sets of radar reflectivities facilitate studies on attenuation correction and the derivation of further weather radar products, e.g. an improved rainfall rate.

Please note that some measurement times are missing due to maintenance and technical errors of the radar. Missing measurement times are not temporal interpolated nor included within the data sets with filled values. The data availability of the years is: 2013 = 57 %, 2014 = 75 %, 2015 = 97 %, 2016 = 98 %, 2017 = 93 %, 2018 = 96 %, 2019 = 98 %, 2020 = 79 %, 2021 = 61 %.

Now a more recent version (Version 2: https://www.wdc-climate.de/ui/entry?acronym=LAWR_UHH_HHG_lev1_v2) exists with the following changes:
- We provide daily instead of hourly files to reduce the number of files for better data handling. For the days 23.09.2014, 12.03.2015, 09.06.2015, 05.07.2017, and 01.02.2018 there are two files to avoid additional time dependencies of variables because of changes in calibration or alignment parameters.
- We changed the data type (double to int64) and the unit days since 1970-01-01 to seconds since 1970-01-01 of the time coordinate.
- We changed the standard names / long names of the variables azimuth, range and ele.
- We added the integer variable grid_mapping with the attributes grid_mapping_name ("radar_lidar_radial_scan"), latitude_of_projection_origin, longitude_of_projection_origin and height_of_projection_origin, as suggested by the CfRadial conventions. Since the grid_mapping variable provides the same information as the variables lat_center, lon_center and zsl_center, we removed them. We added the attribute grid_mapping to the variable rr and dbz.
Newer Version(s)
doi:10.26050/WDCC/LAWR_UHH_HHG_v2
Project
LAWR_UHH (Hamburg Local Area Weather Radars)
Spatial Coverage
Longitude 9.67 to 10.28 Latitude 53.39 to 53.75
Temporal Coverage
2013-05-27 to 2021-08-11 (calendrical)
Use constraints
Creative Commons Attribution 4.0 International (CC BY 4.0) (https://creativecommons.org/licenses/by/4.0/)
Data Catalog
World Data Center for Climate
Size
10.19 TiB (11201138100594 Byte)
Format
NetCDF
Status
will be continued
Creation Date
Future Review Date
2032-05-08
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Cite as
[ Derived from parent entry - See data hierarchy tab ]
Burgemeister, Finn; Clemens, Marco; Ament, Felix (2022). Multi-year X-band weather radar observations in Hamburg (LAWR HHG). World Data Center for Climate (WDCC) at DKRZ. https://doi.org/10.26050/WDCC/LAWR_UHH_HHG

BibTeX RIS
Description
Level 2a - Geophysical Variable - High level Quality Control - approved by the authors (04.05.2022): For example, we compared the LAWR HHG measurement variables with observations of micro rain radars. The radar reflectivites of both measurement devices are in good agreement. Additionally, we checked spatial patterns of several single measurements.
Description
Some measurement times are missing (not included within the data sets) due to maintenance and technical errors. The data availability of the years is: 2013 = 57 %, 2014 = 75 %, 2015 = 97 %, 2016 = 98 %, 2017 = 93 %, 2018 = 96 %, 2019 = 98 %, 2020 = 79 %, 2021 = 61 %. Spatial values are not missing (due to interpolation).

Is previous version of

[1] DOI Burgemeister, Finn; Clemens, Marco; Ament, Felix. (2024). Multi-year X-band weather radar observations in Hamburg (LAWR HHG) (Version 2). doi:10.26050/WDCC/LAWR_UHH_HHG_v2

Is documented by

[1] DOI Lammert, Andrea; Grützun, Verena; Stamnas, Erasmia. (2018). The SAMD Product Standard (Standardized Atmospheric Measurement Data). doi:10.5281/zenodo.1741364

Is compiled by

[1] DOI Lengfeld, K.; Clemens, M.; Münster, H.; Ament, F. (2014). Performance of high-resolution X-band weather radar networks – the PATTERN example. doi:10.5194/amt-7-4151-2014

Parent

Multi-year X-band weather radar observations in Hamburg (LAWR HHG) (Version 1)
Details

Attached Datasets ( 96 )

Details for selected entry

Parent project(s)

Hamburg Local Area Weather Radars

[Entry acronym: LAWR_UHH_HHG_lev1_dbz] [Entry id: 3899892]