Tuesday, 30 January 2024
Hall E (The Baltimore Convention Center)
Estimates of ozone diurnal cycle variations are important not only for understanding the diurnal cycle mechanism, but also for estimating between different instruments the amount of ozone due to other variations, including the long-term trend of ozone. However, it is difficult to determine the daily cycle with satellite observations made twice a day at fixed times. Sakazaki et al (2013) showed the global pattern of diurnal ozone variations throughout the stratosphere in observational dataset from the Superconducting Submillimeter-Wave Limb-Emission Sounder (SMILES) on board the International Space Station (ISS), as well as dataset from nudged chemistry-climate models. They indicated the variations at 20–30 km was mainly caused by dynamics, and those at 30–40 km by photochemistry during the observational period.
We conducted ozonesonde observations at Bengkulu, Indonesia (102.33E, 3.88S) in December 2017 as part of the YMC-Sumatra 2017 field campaign. Of the 25 ECC ozonesonde releases, 18 were conducted over a 3-day period in order to understand the daily cyclic variations. Of these, 15 reached an altitude of 30 km. In addition, we analyzed the data obtained from radiosonde observations made every three hours. During the period, daily variations in the temperature field were predominant in the lower stratosphere at altitudes of 20-26 km. The local-time composite of the altitude-time cross section of the temperature field showed migrating tide and non-migrating tide variations. The ozone component was consistent with the temperature variation. Therefore, at 20-26 km, the ozone variability was dominated by the dynamics (probably vertical flow). The amplitude of the diurnal variability was about 6% at 23.5 km altitude.
This study confirms that the widely used ozone sonde can also extract the diurnal variation component. In the future, we intend to further analyze other data, such as Southern Hemisphere ADditional Ozonesondes (SHADOZ), to confirm the value of diurnal variation at multiple locations.
We conducted ozonesonde observations at Bengkulu, Indonesia (102.33E, 3.88S) in December 2017 as part of the YMC-Sumatra 2017 field campaign. Of the 25 ECC ozonesonde releases, 18 were conducted over a 3-day period in order to understand the daily cyclic variations. Of these, 15 reached an altitude of 30 km. In addition, we analyzed the data obtained from radiosonde observations made every three hours. During the period, daily variations in the temperature field were predominant in the lower stratosphere at altitudes of 20-26 km. The local-time composite of the altitude-time cross section of the temperature field showed migrating tide and non-migrating tide variations. The ozone component was consistent with the temperature variation. Therefore, at 20-26 km, the ozone variability was dominated by the dynamics (probably vertical flow). The amplitude of the diurnal variability was about 6% at 23.5 km altitude.
This study confirms that the widely used ozone sonde can also extract the diurnal variation component. In the future, we intend to further analyze other data, such as Southern Hemisphere ADditional Ozonesondes (SHADOZ), to confirm the value of diurnal variation at multiple locations.
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Sakazaki, T., M. Fujiwara, C.Mitsuda, K. Imai, N.Manago, Y. Naito, T. Nakamura, H. Akiyoshi, D. Kinnison, T. Sano, M. Suzuki, and M. Shiotani (2013), Diurnal ozone variations in the stratosphere revealed in observations from the Superconducting Submillimeter-Wave Limb-Emission Sounder (SMILES) on board the International Space Station (ISS), J. Geophys. Res. Atmos., 118, 2991–3006, doi:10.1002/jgrd.50220.
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