The first twenty years (1994-2014) of ozone soundings from Rapa Nui (27 degrees S, 109 degrees W, 51 m a.s.l.)
Author
dc.contributor.author
Gallardo Klenner, Laura
Author
dc.contributor.author
Henríquez, Adolfo
Author
dc.contributor.author
Thompson, Anne M.
Author
dc.contributor.author
Rondanelli Rojas, Roberto
Author
dc.contributor.author
Carrasco, Jorge
Author
dc.contributor.author
Orfanoz Cheuquelaf, Andrea
Author
dc.contributor.author
Velásquez, Patricio
Admission date
dc.date.accessioned
2017-11-21T15:08:14Z
Available date
dc.date.available
2017-11-21T15:08:14Z
Publication date
dc.date.issued
2016
Cita de ítem
dc.identifier.citation
Tellus B: Chemical and Physical Meteorology, 68:1, 29484 - 2016
es_ES
Identifier
dc.identifier.other
10.3402/tellusb.v68.29484
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/145710
Abstract
dc.description.abstract
Ozone (O-3) soundings have been performed on Easter Island or Rapa Nui (27 degrees S, 109 degrees W, 51 m a.s.l.) since 1994 as part of the Global Atmospheric Watch Programme of the World Meteorological Organization. In this work, we analyse 260 soundings compiled over the period 1994-2014, and make the data available for the international community. We characterise O-3 profiles over this remote area of the Pacific by means of statistical analyses that consider, on the one hand, a traditional climatology that describes the data in terms of seasonal cycles based on monthly averages and, on the other hand, a process-oriented analysis based on self-organising maps. Our analyses show the influence of both tropical and subtropical/mid-latitude air masses at Rapa Nui. The former occurs in summer and fall when convective conditions prevail, and the latter in late winter and spring when subsiding conditions are recurrent. The occurrence of stratospheric intrusions in late winter and spring in connection with deep troughs and the presence of the subtropical jet stream is also apparent in the data set. The tropospheric ozone column is in good agreement with the corresponding data derived from satellites but with a systematic overestimate of summer and fall values. There is evidence of an upward trend in ozone near the surface, which suggests the impact of local pollution. We look forward to an enhancement of the Rapa Nui observing site, given its location that offers a privileged position to observe climate change over the sparsely sampled and vast South Pacific Ocean.
es_ES
Patrocinador
dc.description.sponsorship
FONDECYT
1030809
FONDAP
15110009
Pennsylvania State University
NNX09AJ23G