Abstract:
This dataset contains mesospheric ozone (O3) data acquired by the ground-based British Antarctic Survey's Microwave Radiometer at Troll (BAS-MRT) in Antarctica (72 deg S, 2.5 deg E, 1270 amsl). The BAS radiometer has been designed in order to study the effects of energetic particle precipitation on the middle and upper atmosphere, using nitric oxide and ozone measurements, and the dynamical context using CO. This data set contains the O3 measurements.
The data set covers the period from February 2008 to January 2010. O3 is measured for approximately 20 hours each day and profiles are retrieved every hour. The retrieved profiles cover the pressure range from 3 to 0.02 hPa (approximately 38 to 72 km), with an altitude resolution that varies from 10 km at 3 hPa (39 km) to 18 km at 0.7 hPa (66~km).
Keywords:
Ozone
| Creation Date: | 2013-07-30 |
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| Dataset Progress: | Complete |
| Dataset Language: | English |
| ISO Topic Categories: |
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| Parameters: |
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| Personnel: | |
| Name | Dr Patrick Espy |
| Role(s) | Investigator |
| Organisation | Norwegian University of Science and Technology |
| Name | Marianne Daae |
| Role(s) | Metadata Author, Investigator |
| Organisation | Norwegian University of Science and Technology |
| Name | Dr Corinne Straub |
| Role(s) | Investigator |
| Organisation | Norwegian University of Science and Technology |
| Name | Dr David Newnham |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Parent Dataset: | N/A |
| Reference: | ||
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| Lineage: | The ground-based microwave radiometer of the British Antarctic Survey (BAS) measures spectra in the region of the rotational transitions centered at 250.796 GHz (nitric oxide, NO), 249.79 GHz and 249.96 GHz (ozone, O3) and 230.538 GHz (carbon monoxide, CO). A three-way mechanical chopper system selects the microwave signal either from the main reflector pointing to the sky at 30 deg elevation angle, a 60 K cold load or an ambient-temperature calibration load mounted on the chopper wheel, and directs it into the main receiver. The sky signal is then calibrated using the Dicke switching technique. One calibration cycle takes 17.5 s with 5 s integration time on each target. However, in order to achieve a high enough signal to noise ratio for the profile retrieval, several measured spectra are integrated for one hour, typically 203 spectra from consecutive calibration cycles. Under good observing conditions this results in a measurement noise of about 0.04 K. Spectra with measurement noise higher than 0.71 K, due to e.g. high tropospheric opacity, were not considered for profile retrieval. During the years 2008 and 2009 (715 measurement days) the radiometer acquired a total of 13,648 integrated spectra over 675 days that are suited for profile retrieval. The inversions of the O3 spectra were performed using the optimal estimation method implemented in the Qpack software package (v7.4). The forward model is provided by the Atmospheric Raditative Transfer Simulator 2 (ARTS 2, v.2.1.459), a modular program simulating atmospheric radiative transfer. |
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| Temporal Coverage: | |
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| Start Date | 2008-01-23 |
| End Date | 2010-02-08 |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | -72.01667 |
| Northernmost | -72.01667 |
| Longitude | |
| Westernmost | 2.53333 |
| Easternmost | 2.53333 |
| Altitude | |
| Min Altitude | 1270 m |
| Max Altitude | 1270 m |
| Depth | |
| Min Depth | N/A |
| Max Depth | N/A |
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