La Nina and El Nino—induced variabilities of ozone in the tropical lower atmosphere during 1970–2001
Article first published online: 14 FEB 2003
Copyright 2003 by the American Geophysical Union.
Geophysical Research Letters
Volume 30, Issue 3, February 2003
How to Cite
2003), La Nina and El Nino—induced variabilities of ozone in the tropical lower atmosphere during 1970–2001, Geophys. Res. Lett., 30, 1142, doi:10.1029/2002GL016387, 3., and (
- Issue published online: 14 FEB 2003
- Article first published online: 14 FEB 2003
- Manuscript Accepted: 26 DEC 2002
- Manuscript Revised: 4 NOV 2002
- Manuscript Received: 3 OCT 2002
- El Nino;
- La Nina;
 This study provides the first evidence from several decades of satellite measurements that both La Nina and El Nino events have a comparable and dramatic impact in altering the interannual variability and distribution of tropospheric ozone in the tropics. Measurements of tropospheric ozone were combined from several total ozone mapping spectrometer (TOMS) and backscatter ultraviolet (BUV) satellite instruments to establish long time series in the tropics extending from April 1970 through December 2001. The changes in tropospheric column ozone (TCO) for both La Nina and El Nino are sizeable when compared to local values which average from less than 15 Dobson Units (DU) up to 25 DU over the year. It is suggested that interannual changes in TCO from combined La Nina and El Nino are the dominant source of decadal variability in the tropics.