Open Access Digital Repository of Ministry of Earth Sciences, Government of India

Long-term trends in tropospheric ozone over the Indian tropical region

Saraf, N and Beig, G (2004) Long-term trends in tropospheric ozone over the Indian tropical region. Geophysical Research Letters, 31 (5). L05101 1-5.

Long-term trends.pdf - Published Version

Download (126kB) | Preview


We report a statistical regression model analysis of long-term linear trends in the ozonesonde vertical profiles in the troposphere for the period 1972-2001 from the three tropical stations in tropical India. An analysis of tropospheric column ozone (TCO) data derived from ozonesonde and Nimbus7/Earth Probe -total ozone mapping spectrometer (TOMS) during the period 1979-2002 has also been done. There are no statistically significant trends over Trivandrum (8.3°N, 76.6°E, 61 m) but significant positive trend (within 2-sigma error) are found to occur in the lower troposphere over Pune (18.3°N, 73.5°E, 559 m) and throughout the entire troposphere over a heavily air-polluted urban center Delhi (28.4°N, 77.1°E, 216 m). However, over the last decade, variations in tropospheric ozone have become statistically insignificant even over Delhi in spite of increasing surface NOx concentrations. The TCO obtained by ozonesonde as well as TOMS satellite data over Trivandrum do not reveal any statistically significant trend.

Item Type: Article
Additional Information: Copyright of this article belongs to American Geophysical Union
Uncontrolled Keywords: Air pollution; Mathematical models; Regression analysis; Satellite observatories; Tropics; Troposphere, Ozonesonde vertical profiles; Total ozone mapping spectrometer (TOMS); Tropospheric column ozone (TCO), Ozone, Nimbus-7; statistical analysis; TOMS; total ozone; troposphere; vertical profile, Asia; Eurasia; India; South Asia
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 18 Apr 2015 16:31
Last Modified: 18 Apr 2015 16:31

Actions (login required)

View Item View Item