Comparison of ground-based OH temperature data measured at Irkutsk (52°N, 103°E) and Zvenigorod (56°N, 37°E) stations with Aura MLS v3.3 |
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Authors: | Irina V Medvedeva Anatoly I Semenov Vladimir I Perminov Alexander B Beletsky Andrey V Tatarnikov |
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Institution: | 1. Institute of Solar-Terrestrial Physics (ISTP), Siberian Branch of the Russian Academy of Sciences, Irkutsk, Russia 2. Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences, Moscow, Russia
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Abstract: | Data about the variations of mesopause temperature (~87 km) obtained from ground-based spectrographic measurements of the OH emission (834.0 nm, band (6-2)) at Irkutsk and Zvenigorod observatories were compared with satellite data on vertical temperature distribution in the atmosphere from Aura MLS v3.3. We analyzed MLS data for two geopotential height levels: 0.005 hPa (~84 km) and 0.002 hPa (~88 km) as the closest to OH height (~87 km). We revealed that Aura MLS temperature data have lower values than ground-based (cold bias). In summer periods, that difference increases. Aura cold biases compared with OH(6-2) at Irkutsk and Zvenigorod were calculated. For the 0.002 hPa height level, the biases are 10.1 and 9.4 K, and for 0.005 hPa they are 10.5 and 10.2 K at Irkutsk and Zvenigorod, respectively. When the bias is accounted for, an agreement between Aura MLS and OH(6-2) data obtained at both Irkutsk and Zvenigorod is remarkable. |
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