In:
Annales Geophysicae, Copernicus GmbH, Vol. 36, No. 2 ( 2018-03-16), p. 405-413
Abstract:
Abstract. Ozone is one of the chemical compounds that form part of the atmosphere. It
plays a key role in the stratosphere where the “ozone layer” is located and
absorbs large amounts of ultraviolet radiation. However, during austral
spring (August–November), there is a massive destruction of the ozone layer,
which is known as the “Antarctic ozone hole”. This phenomenon decreases
ozone concentration in that region, which may affect other regions in
addition to the polar one. This anomaly may also reach mid-latitudes; hence,
it is called the “secondary effect of the Antarctic ozone hole”. Therefore,
this study aims to identify the passage of an ozone secondary effect (OSE)
event in the region of the city of Santa Maria – RS (29.68∘ S,
53.80∘ W) by means of a multi-instrumental analysis using the
satellites TIMED/SABER, AURA/MLS, and OMI-ERS. Measurements were made in
São Martinho da Serra/RS – Brazil (29.53∘ S, 53.85∘ W)
using a sounding balloon and a Brewer Spectrophotometer. In addition, the
present study aims to describe and analyse the influence that this
stratospheric ozone reduction has on temperatures presented by these
instruments, including data collected through the radio occultation
technique. The event was first identified by the AURA/MLS satellite on
19 October 2016 over Uruguay. This reduction in ozone concentration was found
by comparing the climatology for the years 1996–1998 for the state of Rio
Grande do Sul, which is close to Uruguay. This event was already observed in
Santa Maria/RS-Brazil on 20 October 2016 as presented by the OMI-ERS
satellite and the Brewer Spectrophotometer. Moreover, a significant decrease
was reported by the TIMED/SABER satellite in Uruguay. On 21 October, the poor
ozone air mass was still over the region of interest, according to the
OMI-ERS satellite, data from the sounding balloon launched in Santa
Maria/RS-Brazil, and measurements made by the AURA/MLS satellite.
Furthermore, the influence of ozone on the stratosphere temperature was
observed during this period. Despite a continuous decrease detected in
height, the temperature should have followed an increasing pattern in the
stratospheric layer. Finally, the TIMED/SABER and OMI-ERS satellites showed
that on 23 October, the air mass with low ozone concentration was moving
away, and its layer, as well as the temperature, in the stratosphere was
re-established. Keywords. Atmospheric composition and structure (middle atmosphere – composition and chemistry; instruments and techniques)
Type of Medium:
Online Resource
ISSN:
1432-0576
DOI:
10.5194/angeo-36-405-2018
Language:
English
Publisher:
Copernicus GmbH
Publication Date:
2018
detail.hit.zdb_id:
1458425-6
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