netcdf hope_lac_mwr00_l1_tb_1_6696903035026812281 { dimensions: time = 56196 ; nv = 2 ; n_freq = 14 ; n_freq2 = 14 ; n_wl_irp = 2 ; variables: float time(time) ; time:units = "seconds since 1970-01-01 00:00:00 UTC" ; time:standard_name = "time" ; time:bounds = "time_bnds" ; float time_bnds(time, nv) ; float lat ; lat:units = "degree_north" ; lat:standard_name = "latitude" ; float lon ; lon:units = "degree_east" ; lon:standard_name = "longitude" ; float zsl ; zsl:units = "m" ; zsl:standard_name = "altitude" ; zsl:long_name = "altitude above mean sea level" ; float freq_sb(n_freq) ; freq_sb:units = "GHz" ; freq_sb:standard_name = "sensor_band_central_radiation_frequency" ; freq_sb:long_name = "frequency of microwave channels" ; float azi(time) ; azi:units = "degree" ; azi:standard_name = "sensor_azimuth_angle" ; azi:_FillValue = -999.f ; azi:comment = "0=North, 90=East, 180=South, 270=West" ; float ele(time) ; ele:units = "degree" ; ele:long_name = "sensor elevation angle" ; ele:_FillValue = -999.f ; float tb(time, n_freq) ; tb:units = "K" ; tb:standard_name = "brightness_temperature" ; tb:long_name = "brightness temperatures" ; tb:_FillValue = -999.f ; tb:valid_min = 2.7f ; tb:valid_max = 330.f ; float offset_tb(time, n_freq) ; offset_tb:units = "K" ; offset_tb:long_name = "brightness temperature offset subtracted from measured brightness temperature" ; offset_tb:_FillValue = -999.f ; offset_tb:comment = "Some types of MWR require a systemmatic adjustement of the measured TBs. This variable gives the offset which was subtracted from each measurement. The offset was deteremined from lwp_std_thres." ; float freq_shift(n_freq) ; freq_shift:units = "GHz" ; freq_shift:long_name = "frequency shift applied to correct measured brightness temperature for frequency offset of microwave radiometer channel" ; freq_shift:_FillValue = -999.f ; freq_shift:comment = "RPG offers a frequency shift within the radiometer software. This shift will modify the TBs calculated. Original TBs cannot be reconstructed. The variable given here is intended to inform the user which frequency shifts were applied to the given TBs" ; float tb_bias(n_freq) ; tb_bias:units = "K" ; tb_bias:long_name = "systematic calibration uncertainty of brightness temperature, one standard deviation" ; tb_bias:_FillValue = -999.f ; tb_bias:comment = "This variable is an estimate of the one-standard-deviation calibration error to be expected from an absolute system calibration, i.e. the likely systematic error of brightness temperature. As a reference see Maschwitz et al. 2012, AMT (Tab. 5). However, these numbers differ from instrument to instrument and should be adapted accordingly. Values only valid for elevation angles larger than 20deg." ; float tb_cov(n_freq2, n_freq) ; tb_cov:units = "K*K" ; tb_cov:long_name = "error covariance matrix of brightness temperature channels" ; tb_cov:_FillValue = -999.f ; tb_cov:comment = "This variable is calculated from brightness temperature observations of an internal black body whose physical temperature is known. The square root of the matrix diagonal gives the brightness temperature random error of each frequency channel. Values only valid for elevation angles larger than 20deg." ; float wl_irp(n_wl_irp) ; wl_irp:units = "micrometer" ; wl_irp:long_name = "infrared pyrometer central wavelength" ; float tb_irp(time, n_wl_irp) ; tb_irp:units = "K" ; tb_irp:long_name = "infrared pyrometer brightness temperature" ; tb_irp:_FillValue = -999.f ; tb_irp:comments = "azimuth angle same as microwave radiometer" ; tb_irp:valid_min = 2.7f ; tb_irp:valid_max = 330.f ; float ele_irp(time) ; ele_irp:units = "degree" ; ele_irp:long_name = "infrared pyrometer elevation angle" ; ele_irp:_FillValue = -999.f ; float ta(time) ; ta:units = "K" ; ta:standard_name = "air_temperature" ; ta:long_name = "air temperature" ; ta:_FillValue = -999.f ; ta:comments = "ambient air temperature measured by sensor on microwave radiometer" ; ta:valid_min = 200.f ; ta:valid_max = 330.f ; float pa(time) ; pa:units = "Pa" ; pa:standard_name = "air_pressure" ; pa:long_name = "air pressure" ; pa:_FillValue = -999.f ; pa:comments = "ambient air pressure measured by sensor on microwave radiometer" ; pa:valid_min = 90000.f ; pa:valid_max = 104000.f ; float hur(time) ; hur:units = "1" ; hur:standard_name = "relative_humidity" ; hur:long_name = "relative humidity" ; hur:_FillValue = -999.f ; hur:comments = "ambient relative humidity measured by sensor on microwave radiometer" ; hur:valid_min = 0.f ; hur:valid_max = 1.1f ; float flag(time) ; flag:long_name = "quality control flags" ; flag:flag_masks = 1.f, 2.f, 4.f, 8.f, 16.f, 32.f, 64.f, 128.f, 256.f, 512.f ; flag:_FillValue = 0.f ; flag:flag_meanings = "manual_filter_band_1 manual_filter_band2 manual_filter_band3 rain_flag sanity_receiver_band1 sanity_receiver_band2 sun_in_beam tb_threshold_band1 tb_threshold_band2 tb_threshold_band3" ; flag:comment = "Flags indicate data that the user should only use with care. In cases of doubt, please refer to the contact person. A Fillvalue of 0 means that data has not been flagged. Bands refer to the measurement ranges (if applicable) of the microwave radiometer; i.e band 1: 20-30 GHz, band 2: 50-60 GHz, band 3: 90 GHz; tb valid range: [ 2.70, 330.00] in K;" ; // global attributes: :Title = "LACROS Microwave radiometer brightness temperatures" ; :Institution = "Leibniz Institute for Tropospheric Research (TROPOS)" ; :Contact_person = "Patric Seifert ( :Source = "RPG HATPRO G4 microwave radiometer of LACROS station" ; :History = "Data processed with mwrpro-v04 by University of Cologne;" ; :Conventions = "CF-1.6" ; :Processing_date = "Thu Nov 12 18:09:10 2015" ; :Author = "Bernhard Pospichal ( bernhard.pospichal@
null uni-leipzig.de
:Comments = "" ; :License = "For non-commercial use only. This data is subject to the HD(CP)2 data policy to be found at hdcp2.zmaw.de and in the HD(CP)2 Observation Data Product Standard." ; :Measurement_site = "LACROS field site" ; :Dependencies = "external" ; }