MIRA2 measurement and retrieval data from 20191001-20200501
Authors/Creators
-
1.
Swedish Institute of Space Physics
Description
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 |
Files
Files
(377.1 MB)
| Name | Size | |
|---|---|---|
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md5:244fcde9b4185520f1e4f0c8e083b9a8
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377.1 MB | Download |