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Abstract

During the last decades of the 19th century day-time and night-time data of surface ozone were collected by means of the Schönbein method at the coastal observatories of Rio de Janerio, Brazil (23 S) and Manila, Philippines (14 N) and at the mountain observatory of Oaxaca de Juarez, Mexico (17 N, 1574 m asl). Taking into account the uncertainties of the method, daily readings have been converted to ppbv concentrations by a procedure already applied to other series of historical data. The calculated time-averaged values show that a century ago the ozone levels at tropical latitudes were considerably lower than at mid-latitudes of the northern and southern hemispheres, similar to the present-day measurements.

Additional information

Authors: SANDRONI S, JRC Ispra (IT);ANFOSSI D, Istituto di Cosmogeofisica del CNR, Torino (IT)
Bibliographic Reference: Article: The Science of the Total Environment, 148 (1994) pp. 23-29
Record Number: 199410983 / Last updated on: 1994-11-28
Category: PUBLICATION
Original language: en
Available languages: en
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