Titre du document / Document title

Ground-based measurements of total ozone and UV radiation by the Brewer spectrophotometer #115 at Hong Kong

Auteur(s) / Author(s)

LAM K. S. ⁽¹⁾ ; AIJUN DING ⁽²⁾ ; CHAN L. Y. ⁽¹⁾ ; WANG T. ⁽¹⁾ ; WANG T. J. ⁽²⁾ ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

⁽¹⁾ Department of Civil and Structural Engineering, Hong Kong Polytechnic University, HONG-KONG
⁽²⁾ Department of Atmospheric Sciences, Nanjing University, Nanjing 210093, CHINE

Résumé / Abstract

Ground-based total ozone (O₃) and spectral solar ultraviolet (UV) radiation measurements recorded by a Brewer #115 at Hong Kong (Cape D'Aguilar, 22°13'N, 114°15'E, 60 m mean sea level) are presented. The ground-based data show good agreement with the satellite data (the correlation coefficient r is 0.942) but there is a systematic difference between the two data sets. In general, the TOMS ozone is about 3% higher than the Brewer ozone. The seasonal variations of total ozone and UV radiation from January 1995 to April 2001 are discussed. Total ozone has a seasonal cycle, it reaches a maximum in May and minimum in January. A quasi-biennial oscillation signal is clearly identified in the total ozone time series. Surface UV radiation also exhibits seasonal cycles that have maxima in July and minima in January. The solar zenith angle (SZA) is confirmed as a crucial factor governing both the seasonal change and magnitude of the surface UV radiation. Clouds and total ozone are also important. The relationship between total ozone and surface UV is discussed. The variability of surface UV due to SZA and cloud are eliminated by selecting UV measurements taken at 45°SZA and under a clear sky. The filtered UV-B shows an anti-correlation with total ozone. It is estimated that 1% increase of total column ozone can cause a 1% decrease of surface UV-B. The analysis has shown that within the period January 1995-April 2001, the total ozone over Hong Kong increased and surface UV decreased.

Revue / Journal Title

Atmospheric environment   ISSN 1352-2310 

Source / Source

2002, vol. 36, n^o 12 (169 p.)  (17 ref.), pp. 2003-2012

Langue / Language

Anglais

Editeur / Publisher

Elsevier Science, Oxford, ROYAUME-UNI  (1994) (Revue)

Mots-clés anglais / English Keywords

Asia ; China ; Interannual variation ; Seasonal variation ; Time variation ; Ultraviolet radiation ; Content ; Ozone ; Photochemical oxidants ; Troposphere ; Air quality ; Air pollution ; Urban area ; Hong Kong ;

Mots-clés français / French Keywords

Asie ; Chine ; Variation interannuelle ; Variation saisonnière ; Variation temporelle ; Rayonnement UV ; Teneur ; Ozone ; Oxydant photochimique ; Troposphère ; Qualité air ; Pollution air ; Zone urbaine ; Hong Kong ;

Mots-clés espagnols / Spanish Keywords

Asia ; China ; Variación interanual ; Variación estacional ; Variación temporal ; Radiación ultravioleta ; Proporción ; Ozono ; Troposfera ; Calidad aire ; Contaminación aire ; Zona urbana ; Hong Kong ;

Localisation / Location

INIST-CNRS, Cote INIST : 8940 B, 35400010140326.0100