de.koeln.rrzk/amd.de.sups/joy.mwrBL00.l1.tbSAMD v.1.0enHD(CP)2sups_joy_mwrBL00_l1_tbHD(CP)2 long term observations, brightness temperature data of
MWR - boundary layer scan (no. 00), by Supersite JOYCE, data version
01Daily files of brightness temperature from boundary layer
scans based microwave radiometer measurementsUlrich Loehnert (loehnert@meteo.uni-koeln.de)Research Center Juelich Institute for Energy and Climate
Research IEK8Tue Feb 10 13:34:31 2015based on CF-1.6externalIn addition to version 00, this version 01 includes
information on offset corrections applied to the observed brightness
temperatures. Data processed with mwrpro-v04 by University of Cologne;NETCDF3_CLASSIC0.1daily1For non-commercial use only. This data is subject to the
HD(CP)2/SAMD data policy to be found at https://doi.org/10.25592/uhhfdm.9823 and in the HD(CP)2/SAMD
Observation Data Product Standard https://doi.org/10.5281/zenodo.1741363.MWR is part of JOYCE, data processed by IMGK, University of
CologneInstitute of Geophysics and Meteorology, University of
CologneUlrichLoehnert+49221 470 1779loehnert@meteo.uni-koeln.de2011-01-012014-12-313600nonenoneThe instrument is located at the JOYCE supersite, on top of
the roof of IEK-8 (building 5.2) of the Forschungszentrum Juelich.Microwave Radiometer Type: HATPRO (Humidity and
Temperature PROfiler) Generation 2, manufactored by Radiometer Physics
GmbH, Meckenheim, Germany Microwave Radiometer Name: TOPHAT. TOPHAT
has seven K band (22.235-31.4 GHz) channels as well as seven V band
channels (51.2-58.0 GHz). The brightness temeparature measurements in
these band are sensitive for the humidity profile, the vertically
integrated amount of cloud liquid water and the temperature profile,
respectively. The files contain 14 brightness temperatures from
boundary layer scans as a function of measurement time and elevation
angle observing direction. Boundary layer scans are performed at the
elevation angles 90, 42, 30, 19.2, 10.2 and 5.4 deg with a integration
time on the order of 10s. Assuming horizontal homogeneity, these data
can be used to gain a highly accurate temperature profile in the
lowest 500 m above ground. Additionally included are temperature,
pressure and humidity at the instrument location as well quality flags
characterizing the instrument performance. Note, that brightness
temperature values are given for all available times so that it is up
to the user to decide whether or not to use the values if quality
flags are set. Provided uncertainties describe the expected random
error of the brightness temperature channels (variance) for each
measurement in addition to the covariances among the different
channels. Also included is the expected systematic uncertainty for
brightness temperature when carying out a absolute calibration
(Maschwitz et al., 2012 in Atmospheric Measurement Techniques). For
detailed documentation of the instrument see:
http://www.radiometer-physics.de/ or Rose et al. (2005) in Atmospheric
Research TOPHAT was installed at JOYCE on 22.7.2010 as has been
measuring in a 24/7 mode since then. For details on TOPHAT at the
JOYCE supersite please refer to
http://gop.meteo.uni-koeln.de/ag_crewell/doku.php?id=instruments:tophat:tophatnonenone50.9085476.413536111none14 channel K and V band microwave profiler, fully
scanable in azimuth and elevation2005T. Rose, S. Crewell, U. Loehnert, and C. SimmerA network suitable microwave radiometer for operational
monitoring of the cloudy atmospherenoneAtmos. Res., Special issue: CLIWA-NET: Observation and
Modelling of Liquid Water Clouds, 75(3), 183-200,
doi:10.1016/j.atmosres.2004.12.0052007S. Crewell and U. LoehnertAccuracy of boundary layer temperature profiles retrieved with
multi-frequency, multi-angle microwave radiometrynoneIEEE Transactions on Geoscience and Remote Sensing, 45(7),
2195-2201, DOI:10.1109/TGRS.2006.888434Long term observationsLocal observationsSupersitesJOYCELong term observationsLocal observationsVariable groupsRadiometricLong term observationsLocal observationsInstrument groupsMWR 15 2 14 2 6 time n_time, time time seconds since 1970-01-01 00:00:00 UTC time_bnds n_time, nv missing lat latitude latitude degrees_north lon longitude longitude degrees_east zsl altitude altitude above mean sea level m freq_sb n_freq, sensor_band_central_radiation_frequency frequency band GHz azi n_angle, sensor_azimuth_angle sensor azimuth angle degree ele n_angle, sensor elevation angle degree tb n_time, n_angle, n_freq brightness_temperature brightness temperatures K offset_tb n_time, n_angle, n_freq brightness temperatures offset correction subtracted K freq_shift n_freq, frequency shift applied to brightness temperature 1 tb_bias n_freq, systematic calibration uncertainty of brightness
temperature, one standard deviation K tb_cov n_freq, n_freq error covariance matrix of brightness temperature
channels K*K ta n_time, air_temperature air temperature K pa n_time, air_pressure air pressure Pa hur n_time, relative_humidity relative humidity 1 flag n_time, quality control flags missing