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Ozone Trend over Taiwan from TOMS Data

Hsu, Kuang-Jung and Yung, Yuk Ling (1999) Ozone Trend over Taiwan from TOMS Data. Terrestrial Atmospheric and Oceanic Sciences, 10 (3). pp. 619-632. ISSN 1017-0839.

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Ozone column data obtained from Nimbus 7 satellite instrument, TOMS, were analyzed. Total ozone data over Taiwan starts November 1978 till May 1993. Daily observations were changed into monthly data for trend analysis. First, spectral analyses were performed to find possible atmospheric movements. Significant peaks were found at periods of 6, 12, 19, and 29 months. The first two are due to seasonal variations. The last one corresponds to the quasi-biennial oscillation (QBO) in stratosphere. It is suggested that the 19-months period is the difference of the annual and the equatorial QBD frequencies. A linear regression model (LRM) described by Yang and Tung (J. of Geophysical Res. 100, 9091, 1995) were adapted to the deseasoned ozone data. Besides the QBD, the solar flux and ENSO are known to affect the amount of ozone in the Earth atmosphere. The 30-mbar Singapore wind and F10.7-cm solar flux were chosen to represent variations of QBD and solar flux, respectively. The estimated total ozone decreasing trends due to anthropogenic activities are 0.92 + - 0.46% and 1.77 + - 0.52% per decade over Taipei and Cheng-Kung, respectively. Increase in tropospheric production of ozone in Taipei may explain the lower trend in Taipei than that in Cheng-Kung. Estimated contributions from natural variables to the total ozone variations are: 3.2% and 2.8% form QBD maximum to minimum; 2.0% and 2.3% per 100 solar units for Taipei and Cheng-Kung, respectively. Influence from ENSO seems to be insignificant. Comparison with ground total ozone stations will be discussed.

Item Type:Article
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Yung, Yuk Ling0000-0002-4263-2562
Additional Information:© 1999 Chinese Geoscience Union. Manuscript received 24 September 1998, in final form 13 July 1999. The authors would like to thank Prof. H. H. Hsu for many helpful discussions. This study is supported by National Science Council of Taiwan under the Grant NSC 88-2111-M-002-012.
Group:UNSPECIFIED, Division of Geological and Planetary Sciences
Funding AgencyGrant Number
National Science Council of TaiwanNSC 88-2111-M-002-012
Subject Keywords:Total ozone, Trend, Ozone Trend over Taiwan from TOMS Data
Issue or Number:3
Record Number:CaltechAUTHORS:20140827-140013357
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48999
Deposited By: Ruth Sustaita
Deposited On:27 Aug 2014 21:19
Last Modified:09 Mar 2020 13:19

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