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La Nina and El Nino—induced variabilities of ozone in the tropical lower atmosphere during 1970–2001
Author(s) -
Ziemke J. R.,
Chandra S.
Publication year - 2003
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2002gl016387
Subject(s) - la niña , total ozone mapping spectrometer , climatology , ozone , troposphere , environmental science , tropics , tropospheric ozone , atmospheric sciences , atmosphere (unit) , satellite , stratosphere , ozone layer , geology , meteorology , geography , el niño southern oscillation , physics , astronomy , fishery , biology
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.