Unusual stratospheric ozone anomalies observed in 22 years of measurements from Lauder, New Zealand
Item
Title (Dublin Core)
Unusual stratospheric ozone anomalies observed in 22 years of measurements from Lauder, New Zealand
Description (Dublin Core)
The Microwave Ozone Profiling Instrument (MOPI1) has provided ozone (O<sub>3</sub>) profiles for the Network for the Detection of Atmospheric Composition Change (NDACC) at Lauder, New Zealand (45.0° S, 169.7° E), since 1992. We present the entire 22-year data set and compare with satellite O<sub>3</sub> observations. We study in detail two particularly interesting variations in O<sub>3</sub>. The first is a large positive O<sub>3</sub> anomaly that occurs in the mid-stratosphere (~ 10–30 hPa) in June 2001, which is caused by an anticyclonic circulation that persists for several weeks over Lauder. This O<sub>3</sub> anomaly is associated with the most equatorward June average tracer equivalent latitude (TrEL) over the 36-year period (1979–2014) for which the Modern Era Retrospective-Analysis for Research and Applications (MERRA) reanalysis is available. A second, longer-lived feature, is a positive O<sub>3</sub> anomaly in the mid-stratosphere (~ 10 hPa) from mid-2009 until mid-2013. Coincident measurements from the Aura Microwave Limb Sounder (MLS) show that these high O<sub>3</sub> mixing ratios are well correlated with high nitrous oxide (N<sub>2</sub>O) mixing ratios. This correlation suggests that the high O<sub>3</sub> over this 4-year period is driven by unusual dynamics. The beginning of the high O<sub>3</sub> and high N<sub>2</sub>O period at Lauder (and throughout this latitude band) occurs nearly simultaneously with a sharp decrease in O<sub>3</sub> and N<sub>2</sub>O at the equator, and the period ends nearly simultaneously with a sharp increase in O<sub>3</sub> and N<sub>2</sub>O at the equator.
Creator (Dublin Core)
Nedoluha, G. E.
Boyd, I. S.
Parrish, A.
Gomez, R. M.
Allen, D. R.
Froidevaux, L.
Connor, B. J.
Querel, R. R.
Date (Dublin Core)
2018-09-09
Type (Dublin Core)
Text
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
10.5194/acp-15-6817-2015
https://acp.copernicus.org/articles/15/6817/2015/
Source (Dublin Core)
eISSN: 1680-7324
Language (Dublin Core)
eng
