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Trend analysis of upper stratospheric Umkehr ozone data for evidence of turnaround
Author(s) -
Reinsel Gregory C.
Publication year - 2002
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 - 10.1029/2002gl014716
Subject(s) - trend analysis , environmental science , climatology , ozone , residual , atmospheric sciences , stratosphere , ozone layer , meteorology , statistics , geography , mathematics , geology , algorithm
Recent upper stratospheric (∼35–45 km) Umkehr ozone data from three high‐quality stations have been examined, with residual and change‐in‐trend analyses performed. These data show a consistent feature of mildly positive tendency in values for the recent several years. Trend analyses of these data yield significant positive change‐in‐trend estimates of about 0.75% per year since 1996 relative to negative trends of about −0.55% per year existing prior to 1996, leading to a (nonsignificant) estimate of about 0.2% per year positive trend for the recent 5‐year period since the 1996 change‐in‐trend date.