Latitudinal UVR-PAR measurements in Argentina: Extent of the 'ozone hole'

The UVR-PAR Argentinean Monitoring Network started its operation in September 1994 recording ultraviolet (UVR) and Photosynthetic Available Radiation (PAR) at a frequency of once per minute, at four sites, throughout the entire year. Four spectroradiometers (GUV-511, Biospherical Instruments, Inc.)...

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Autores principales: Orce, V.L., Helbling, E.W.
Formato: JOUR
Materias:
irradiance
ozone hole
PAR
tropospheric pollution
ultraviolet
Argentina
Rickettsia sp. PAR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_09218181_v15_n3-4_p113_Orce
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_09218181_v15_n3-4_p113_Orce
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spelling todo:paper_09218181_v15_n3-4_p113_Orce2023-10-03T15:45:42Z Latitudinal UVR-PAR measurements in Argentina: Extent of the 'ozone hole' Orce, V.L. Helbling, E.W. irradiance ozone hole PAR tropospheric pollution ultraviolet Argentina Rickettsia sp. PAR The UVR-PAR Argentinean Monitoring Network started its operation in September 1994 recording ultraviolet (UVR) and Photosynthetic Available Radiation (PAR) at a frequency of once per minute, at four sites, throughout the entire year. Four spectroradiometers (GUV-511, Biospherical Instruments, Inc.) were installed at research centers separated by about 8-12 degrees of latitude, extending from the Subantarctic-Fueguian region to the Tropic of Capricorn. The instruments are located in populated areas ranging from 30.000 to 11 million people and with extremely different climate regimes and conditions of tropospheric pollution. Our ground-based data indicated that the irradiance increased steadily from south to north. This increase was also observed in the calculated daily doses of UV-B (280-320 nm); however, daily integrated values for UV-A (320-400 nm) and PAR (400-700 nm) were higher at mid-latitudes (Puerto Madryn, 42°47'S). A similar south-to-north increase was evident in the ratio of the energy at 305 nm and 340 nm wavelengths (with low 305/340 ratios indicating high total ozone column concentration), with low values at Ushuaia (55°01'S) and high values at Jujuy (24°10'S). However the 305/340 ratios increased significantly over their normal spring values at two s res Ushuaia and Puerto Madryn, for variable me periods during October-December. Our data suggest that the ozone hole was over South America extending to about 38°S for at least a week during October and about two weeks during November-December of the years of 1994 and 1995. However, it should be noted that the erythemal irradiance, in the area influenced by the ozone hole, was at all times lower than that in Buenos Aires and well below the value at Jojuy (tropical station). This study also indicates that when assessing the impact of solar UVR upon organisms, other variables such as cloud cover, solar zenith angle, day length, latitude, and atmospheric pollution should be considered in addition to total ozone column concentration. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09218181_v15_n3-4_p113_Orce
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic irradiance
ozone hole
PAR
tropospheric pollution
ultraviolet
Argentina
Rickettsia sp. PAR
spellingShingle irradiance
ozone hole
PAR
tropospheric pollution
ultraviolet
Argentina
Rickettsia sp. PAR
Orce, V.L.
Helbling, E.W.
Latitudinal UVR-PAR measurements in Argentina: Extent of the 'ozone hole'
topic_facet irradiance
ozone hole
PAR
tropospheric pollution
ultraviolet
Argentina
Rickettsia sp. PAR
description The UVR-PAR Argentinean Monitoring Network started its operation in September 1994 recording ultraviolet (UVR) and Photosynthetic Available Radiation (PAR) at a frequency of once per minute, at four sites, throughout the entire year. Four spectroradiometers (GUV-511, Biospherical Instruments, Inc.) were installed at research centers separated by about 8-12 degrees of latitude, extending from the Subantarctic-Fueguian region to the Tropic of Capricorn. The instruments are located in populated areas ranging from 30.000 to 11 million people and with extremely different climate regimes and conditions of tropospheric pollution. Our ground-based data indicated that the irradiance increased steadily from south to north. This increase was also observed in the calculated daily doses of UV-B (280-320 nm); however, daily integrated values for UV-A (320-400 nm) and PAR (400-700 nm) were higher at mid-latitudes (Puerto Madryn, 42°47'S). A similar south-to-north increase was evident in the ratio of the energy at 305 nm and 340 nm wavelengths (with low 305/340 ratios indicating high total ozone column concentration), with low values at Ushuaia (55°01'S) and high values at Jujuy (24°10'S). However the 305/340 ratios increased significantly over their normal spring values at two s res Ushuaia and Puerto Madryn, for variable me periods during October-December. Our data suggest that the ozone hole was over South America extending to about 38°S for at least a week during October and about two weeks during November-December of the years of 1994 and 1995. However, it should be noted that the erythemal irradiance, in the area influenced by the ozone hole, was at all times lower than that in Buenos Aires and well below the value at Jojuy (tropical station). This study also indicates that when assessing the impact of solar UVR upon organisms, other variables such as cloud cover, solar zenith angle, day length, latitude, and atmospheric pollution should be considered in addition to total ozone column concentration.
format JOUR
author Orce, V.L.
Helbling, E.W.
author_facet Orce, V.L.
Helbling, E.W.
author_sort Orce, V.L.
title Latitudinal UVR-PAR measurements in Argentina: Extent of the 'ozone hole'
title_short Latitudinal UVR-PAR measurements in Argentina: Extent of the 'ozone hole'
title_full Latitudinal UVR-PAR measurements in Argentina: Extent of the 'ozone hole'
title_fullStr Latitudinal UVR-PAR measurements in Argentina: Extent of the 'ozone hole'
title_full_unstemmed Latitudinal UVR-PAR measurements in Argentina: Extent of the 'ozone hole'
title_sort latitudinal uvr-par measurements in argentina: extent of the 'ozone hole'
url http://hdl.handle.net/20.500.12110/paper_09218181_v15_n3-4_p113_Orce
work_keys_str_mv AT orcevl latitudinaluvrparmeasurementsinargentinaextentoftheozonehole
AT helblingew latitudinaluvrparmeasurementsinargentinaextentoftheozonehole
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