Trend and recovery of the total ozone column in South America and Antarctica

Toro A., Richard; Araya, Consuelo; Labra O., Felipe; Morales, Luis; Morales, Raúl; Leiva G., Manuel
December 2017
Climate Dynamics;Dec2017, Vol. 49 Issue 11/12, p3735
Academic Journal
South America is one of the most vulnerable areas to stratospheric ozone depletion; consequently, an increased amount of UV radiation reaches the Earth's surface in this region. In this study, we analyzed the long-term trend in the total ozone column (TOC) over the southern part of the South American continent from 1980 to 2009. The database used was obtained by combining several satellite measurements of the TOC on a 1° (latitude) × 1.25° (longitude) grid. Analysis of the long-term trend was performed by applying the Theil-Sen estimator and the Mann-Kendall significance test to the deseasonalized time series. The long-term trend was also analyzed over several highly populated urban zones in the study area. Finally, multiple linear regression (MLR) modeling was used to identify and quantify the drivers of interannual variability in the TOC over the study area with a pixel-by-pixel approach. The results showed a decrease in the TOC ranging from −0.3 to −4% dec from 1980 to 2009. On a decadal timescale, there is significant variability in this trend, and a decrease of more than −10% dec was found at high latitudes (1980-1989). However, the trends obtained over much of the study area were not statistically significant. Considering the period from 1980 to 1995, we found a decrease in the TOC of −2.0 ± 0.6% dec at latitudes below 40° S and −6.9 ± 2.0% dec at latitudes above 40° S, for a 99.9% confidence level over most of the study area. Analysis of the period from 1996 to 2009 showed a statistically significant increase of 2.3 ± 0.1% dec at high latitudes (> 60° S), confirming the initial TOC recovery in the Antarctic. Despite evidence for initial recovery of the TOC in some parts of the study area between 1996 and 2009, the long-term increase from September to November is not yet statistically significant. In addition, large parts of the study area and most of the urban areas continue to show a decreasing trend in the TOC. The MLR results show that at high latitudes, the main driver of interannual variability in the TOC is the total effective amount of halogens, followed by the eddy heat flux.


Related Articles

  • Quasi-decadal variability of the stratosphere: Influence of long-term solar ultraviolet variations. Hood, L.L.; Jirikowic, J.L. // Journal of the Atmospheric Sciences;12/15/93, Vol. 50 Issue 24, p3941 

    Investigates the existence of the upper-stratospheric ozone, temperature and zonal wind responses to long-term changes in solar ultraviolet radiation. Review of related literature; Use of a multiple regression statistical model; Sources of data.

  • Ozone fades; monitoring fails.  // Earth Island Journal;Summer96, Vol. 11 Issue 3, p3 

    Cites an April 1996 report by the National Oceanic and Atmospheric Administration (NOAA) which shows that the Earth's ozone shield had once again fallen to new lows. Inaccuracy of the US Weather Service's reports warning the public of dangerous ultraviolet (UV) radiation; UV readings by Sunsor Inc.

  • Improving Antarctic Total Ozone Projections by a Process-Oriented Multiple Diagnostic Ensemble Regression. Karpechko, Alexey Yu.; Maraun, Douglas; Eyring, Veronika // Journal of the Atmospheric Sciences;Dec2013, Vol. 70 Issue 12, p3959 

    Accurate projections of stratospheric ozone are required because ozone changes affect exposure to ultraviolet radiation and tropospheric climate. Unweighted multimodel ensemble-mean (uMMM) projections from chemistry-climate models (CCMs) are commonly used to project ozone in the twenty-first...

  • Harmful rays hit southern city. Kiernan, Vincent // New Scientist;6/19/93, Vol. 138 Issue 1878, p7 

    Reports on the increased ultraviolet radiation level recorded in Ushuaia, Argentina. Technical background information; Other instances in other parts; Passing of ozone hole.

  • How Dangerous Is Thinning?  // USA Today Magazine;Jun91, Vol. 119 Issue 2553, p13 

    Reports on the findings of University of Chicago dermatologists that the thinning of the ozone layer may be not greatly detrimental to human health. Impact of exposure to ultraviolet rays on the immune system; Inability of radiation to reach the Earth's surface.

  • Ozone down; radiation up. G.S. // Earth Island Journal;Summer93, Vol. 8 Issue 3, p17 

    Reports on factors accounting for the decrease in ozone depletion and increase in ultraviolet B radiation levels as of summer 1993. Ozone levels in various areas; Effect of volcanic gases from the 1991 eruption of Mount Pinatubo in the Philippines on the chemical processes that destroy the...

  • Effects of solar ultraviolet radiation on antarctic phytoplankton during springtime ozone depletion. Villafane, Virginia E.; Helbling, E. Walter // Antarctic Journal of the United States;1994, Vol. 29 Issue 5, p259 

    Discusses the effects of ultraviolet radiation on phytoplanktons in Antarctica during springtime ozone depletion. Analysis of the planktons' chemical composition during the period; Absorption spectra of methanol extracts.

  • Coherence of long-term stratospheric ozone vertical distribution time series used for the study of ozone recovery at a northern mid-latitude station. Nair, P. J.; Godin-Beekmann, S.; Pazmiño, A.; Hauchecorne, A.; Ancellet, G.; Petropavlovskikh, I.; Flynn, L. E.; Froidevaux, L. // Atmospheric Chemistry & Physics;2011, Vol. 11 Issue 10, p4957 

    The coherence of stratospheric ozone time series retrieved from various observational records is investigated at Haute-Provence Observatory (OHP--43.93° N, 5.71° E). The analysis is accomplished through the intercomparison of collocated ozone measurements of Light Detection and Ranging...

  • Daily Surface UV Exposure and Its Relationship to Surface Pollutant Measurements. Barnard, W. F.; Saxena, V. K.; Wenny, B. N.; DeLuisi, J. J. // Journal of the Air & Waste Management Association (Air & Waste M;Feb2003, Vol. 53 Issue 2, p1 

    Focuses on relationship of daily surface ultraviolet (UV) exposure to surface pollutant measurements. Principle effect of decrease in stratospheric ozone layer in the Northern Hemisphere; Ability of specific air pollutants to reduce the increased surface levels of UV radiation; Stratospheric...

  • Scientists study Chile's ozone hole. Crawford, Leslie // BMJ: British Medical Journal (International Edition);11/21/92, Vol. 305 Issue 6864, p1245 

    Reports the study conducted by doctors from John Hopkins University to evaluate the health effects of ozone thinning in Chile. Assessment of damage brought by ultraviolet rays; Cause of ozone loss; Development of a personal dosimeter.


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics