CLIMATOLOGICAL ANALYSIS OF OZONE AND METEOROLOGICAL PARAMETERS
A BACKGROUND SITE: CERRO TOLOLO 30S,70W, 2200 m.a.s.l. Ana Maria
Cordova CMM
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LATITUDE30 10 SUR LONGITUDE 70 48OESTE 2030 m.a.s.l A 80 KMS
NEXT TO LA SERENA CITY
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Cerro Tololo
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Ozone Monitor
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Chilean Weather Office / Global Atmospheric Watch (GAW) program
of the World Meteorological Organization (WMO) SOLAR RADIATION (W m
-2 ) SOLAR RADIATION (INCIDENT)(W m -2 ) SOLAR RADIATION (DIFUSE)(W
m -2 ) NET RADIATION (Wm -2 ) AVERAGE UV-B ERYTHERMAL RADIAT (MW m
-2 ) AVERAGE UV-B TOTAL RADIATION (MW m -2 ) AMBIENT TEMPERATURE
(C) WIND SPEED AND DIRECTION RELATIVE HUMIDITY (%) PRESSURE TOTAL
PRECIPITATION (mm)
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Average Ozone Concentrations El NioLa Nia
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Frecuency of wind direction at Cerro Tololo
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Results The ozone concentrations ranged from 11 ppb to 60 ppb.
Results showed that O 3 concentrations measured during summer (DJF)
were lower than spring season (SON) at Cerro Tololo. The average
ozone concentrations do not show significant diurnal cycle at this
site. The ozone concentrations during summer and autumn are 27 ppb
(SD 5.2 ppb). The increase of ozone concentrations are observed
during of month of spring (SON) with the maximum concentration of
60 ppb. The maximum solar radiation decrease from 1100 Wm -2 in
summer (DJF) to 620 Wm -2 in winter (JJA).
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Ozone concentrations do not show a positive correlation with
solar and UV-B radiation. This indicates that in situ photochemical
production is not the driving process at this site. In fact that,
previous work suggest that synoptical features linked with
stratosphere- troposphere exchange play a significant role in
explaining the spring maximum and the sudden increases in ozone
mixing ratios observed at Cerro Tololo. The index UV is higher than
11 (exposure category = extreme) from November to February. Ozone
concentrations do not show correlations with wind speed and wind
direction at surface. The wind direction is principally from
Northeast during all year.
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AEROSOLS IN AN ARID ZONE TRANSECT IN CHILE Study was performed
between December 2002 and December 2003 Three Sigma-2 sedimentation
samplers were employed to collect aerosol particles along a
transect in semiarid zone from the coast, through the agricultural
areas of the Elqui Valley, up to Cerro Tololo
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Average total coarse suspended particles (2.5 10 um)
measurements in summer, autumm, winter and spring at La Serena, San
Carlos and Tololo.
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Percentage of sea salt and black coarse particles in total
coarse particles at La Serena, San Carlos and Tololo.
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Tololo Campaign 2004
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Other project FONDECYT NATIONAL RESEARCH FUNDING COMPETITION
REGULAR COMPETITION 2005 Characterization of aerosols and cloud
condensation nuclei in the Subtropics of Chile The general goal in
this project is twofold. On the one hand, to determine the nature
of particles that control the number population of droplets in the
stratocumulus layer in the western Pacific coastal of Chile, and on
the other hand, to characterize the origin and composition of
aerosols in the area. Dr. Kevin Noone at Stockholm University. Dr
Manuel Andres Leiva Guzman at Chile University
