MIRA2 measurement and retrieval data from 20191001-20200501

Overview This dataset contains retrieval and measurement data of ozone from MIRA2, a microwave radiometer located in Kiruna, Sweden. The dataset was used in a study comparing ozone retrievals from MIRA2 with those from the Microwave Limb Sounder (MLS) over the period from 1 October 2019 to 1 May 2020. It was also used to estimate chemical ozone loss during the Northern Hemisphere winter of 2019/2020. Dataset The data are stored hierarchically in an HDF5 (.hdf5) file. The top-level groups are timestamps represented as strings in the format “%Y%m%dT%H%M%S”, corresponding to the date and time at the midpoint of each measurement. Each timestamp group contains associated metadata stored as attributes. Within each timestamp group, two subgroups are defined: “measurement” and “retrieval”, which contain the measurement data and retrieved data, respectively. Attributes key description source name of the original file inside_vortex boolean flag indicating whether measurement occured inside the polar vortex timestamp the timestamp in the parent group in ISO format Measurement key description unit azimuth azimuthal line of sight angle degrees end_date date of when measurement ended - end_time time of when measurement ended - start_date date of when measurement started - start_time time of when measurement started - f frequency vector Hz gas marker for the measured gas - integration number of integrations - integration-time for how long integration occured ms p_grid atmospheric pressure grid Pa record-no marker for database record - spectrometer from which spectrometer data originated - t_baseline approximation of the baseline level of the spectra K t_field coincident ECMWF temperature field K t_surface outside temperature at the start of the measurement K t_trop approximation of tropospheric temperature K y measured spectra K z_field coincident ECMWF altitude field m za zenith line of sight angle degrees Retrieval key description unit avk averaging kernel from retrieval - f_backend frequecy vector used in retrieval Hz p_grid pressure grid used in retrieval Pa retrieval_eo observational error vector from retrieval VMR retrieval_ss smoothing error vector from retrieval VMR source source of raw data file - vmr_field ozone apriori VMR x relative retrieved state to apriori - y measurement used in retrieval K yf fit of measurement vector from retrieval K z_field altitude field interpolated from pressure grid used in retrieval m