Long-term trends and decadal solar variability in ozone near the tropopause over the Indian region.
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| Title: | Long-term trends and decadal solar variability in ozone near the tropopause over the Indian region. |
|---|---|
| Authors: | Fadnavis, S.1 (AUTHOR) Suvarna@tropmet.res.in, Iyer, Usha1 (AUTHOR), Ernest Raj, P.1 (AUTHOR) |
| Source: | International Journal of Remote Sensing. Oct2013, Vol. 34 Issue 19, p6749-6763. 15p. 6 Graphs. |
| Subjects: | Solar oscillations, Ozone layer, Tropopause, Regression analysis, Solar cycle |
| Geographic Terms: | India |
| Abstract: | To investigate the long-term trends and effects of decadal solar variability in the upper tropospheric ozone, data obtained from the Stratospheric Aerosol and Gas Experiment II (SAGE II) aboard the Earth Radiation Budget Satellite (ERBS) during the period 1985–2005 were analysed using a multifunctional regression model over the Indian region (8–40° N; 65–100° E). Analysis of time series spanning these years shows statistically insignificant trends (at the two-sigma level (95% confidence level)) at upper tropospheric pressure levels (10−16 km). This period covers two solar cycles, one lasting from 1985 to 1995 and the other from 1996 to 2005; these are referred to as decade I and decade II, respectively. Since temporal variation in ozone number density indicates 11 year periodicity, trends are statistically significant when calculated separately during each solar cycle. Trend analysis indicates statistically significant positive trends (0.7 ± 1.7% to 3.9 ± 2.9% year−1during decade I, and 2.2 ± 1.6% to 4.5 ± 3.0% year−1during decade II). In general, higher ozone trends are observed during decade II. Seasonal variation in trends during decade II shows increasing trends during the pre-monsoon (0.8−3.8% year−1), monsoon (0.8−7.1% year−1), and post-monsoon (2.8−8.0% year−1) seasons. The annually averaged solar signal in ozone is found to be of the order of around −5 ± 4.3% to −13.8 ± 6.7%/(100 sfu). Results obtained in the present study are also compared with those obtained by other researchers. [ABSTRACT FROM AUTHOR] |
| Copyright of International Journal of Remote Sensing is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Long-term trends and decadal solar variability in ozone near the tropopause over the Indian region. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Fadnavis%2C+S%2E%22">Fadnavis, S.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> Suvarna@tropmet.res.in</i><br /><searchLink fieldCode="AR" term="%22Iyer%2C+Usha%22">Iyer, Usha</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ernest+Raj%2C+P%2E%22">Ernest Raj, P.</searchLink><relatesTo>1</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Remote+Sensing%22">International Journal of Remote Sensing</searchLink>. Oct2013, Vol. 34 Issue 19, p6749-6763. 15p. 6 Graphs. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Solar+oscillations%22">Solar oscillations</searchLink><br /><searchLink fieldCode="DE" term="%22Ozone+layer%22">Ozone layer</searchLink><br /><searchLink fieldCode="DE" term="%22Tropopause%22">Tropopause</searchLink><br /><searchLink fieldCode="DE" term="%22Regression+analysis%22">Regression analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Solar+cycle%22">Solar cycle</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22India%22">India</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: To investigate the long-term trends and effects of decadal solar variability in the upper tropospheric ozone, data obtained from the Stratospheric Aerosol and Gas Experiment II (SAGE II) aboard the Earth Radiation Budget Satellite (ERBS) during the period 1985–2005 were analysed using a multifunctional regression model over the Indian region (8–40° N; 65–100° E). Analysis of time series spanning these years shows statistically insignificant trends (at the two-sigma level (95% confidence level)) at upper tropospheric pressure levels (10−16 km). This period covers two solar cycles, one lasting from 1985 to 1995 and the other from 1996 to 2005; these are referred to as decade I and decade II, respectively. Since temporal variation in ozone number density indicates 11 year periodicity, trends are statistically significant when calculated separately during each solar cycle. Trend analysis indicates statistically significant positive trends (0.7 ± 1.7% to 3.9 ± 2.9% year−1during decade I, and 2.2 ± 1.6% to 4.5 ± 3.0% year−1during decade II). In general, higher ozone trends are observed during decade II. Seasonal variation in trends during decade II shows increasing trends during the pre-monsoon (0.8−3.8% year−1), monsoon (0.8−7.1% year−1), and post-monsoon (2.8−8.0% year−1) seasons. The annually averaged solar signal in ozone is found to be of the order of around −5 ± 4.3% to −13.8 ± 6.7%/(100 sfu). Results obtained in the present study are also compared with those obtained by other researchers. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of International Journal of Remote Sensing is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1080/01431161.2013.798054 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 15 StartPage: 6749 Subjects: – SubjectFull: Solar oscillations Type: general – SubjectFull: Ozone layer Type: general – SubjectFull: Tropopause Type: general – SubjectFull: Regression analysis Type: general – SubjectFull: Solar cycle Type: general – SubjectFull: India Type: general Titles: – TitleFull: Long-term trends and decadal solar variability in ozone near the tropopause over the Indian region. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Fadnavis, S. – PersonEntity: Name: NameFull: Iyer, Usha – PersonEntity: Name: NameFull: Ernest Raj, P. IsPartOfRelationships: – BibEntity: Dates: – D: 10 M: 10 Text: Oct2013 Type: published Y: 2013 Identifiers: – Type: issn-print Value: 01431161 Numbering: – Type: volume Value: 34 – Type: issue Value: 19 Titles: – TitleFull: International Journal of Remote Sensing Type: main |
| ResultId | 1 |
