NO2 vertical column retrieved by DOAS technique in Marambio, Antarctic

RAPONI M. M.; JIMÉNEZ, RODRIGO; TOCHO, J. O.; QUEL, E. J.

Foz do Iguaçu, Brazil

Congreso; International Radiation Symposium (IRC/IAMAS); 2008

IRC/IAMAS

Resumen Un numero de especies químicas presentes en la estratosfera, en concentraciones del orden de partes por billón y aún menores, contribuyen significativamente al equilibro químico de la misma. Uno de los principales gases traza a nivel estratosférico es el bióxido del nitrógeno (NO2). Dicho gas actúa como agente limitante en la destrucción del ozono estratosférico producida por el monóxido de cloro, de ahí la importancia de su estudio. En este trabajo se presentan los resultados de las mediciones efectuadas en la Base Antártica Argentina Marambio (64° 14’ 25’’ Sur; 56° 37’ 21’’ Oeste), durante los meses de enero y febrero de 2008, utilizando un sistema de sensado remoto atmosférico de tipo pasivo. El sistema consiste en una fibra óptica de 400 μm de núcleo y 6 m de longitud y un analizador espectral portátil (espectrómetro HR4000, Ocean Optics). El dispositivo mide la irradiancia espectral solar difusa en el rango UV-VIS (290-650 nm), colectada y transferida por la fibra óptica apuntanda al cenit. La densidad de la columna vertical de NO2 se obtiene a partir de los espectros aplicando la técnica DOAS (Differential Optical Absorption Spectroscopy). El sistema y la técnica permiten medir diferentes especies de interés de forma simultánea en una variedad de condiciones meteorológicas. Las columnas verticales obtenidas se comparan con mediciones del mismo sitio realizadas con el instrumento EVA, un espectrómetro de absorción en el visible, del Instituto Nacional de Técnica Aeroespacial, INTA, España. Abstract A number of chemical species present in the stratosphere in small concentrations of parts for billion and even smaller, contribute significantly to its chemical balance. One of the main stratospheric trace gases is the nitrogen dioxide (NO2). This gas acts as a restrictive agent in the stratospheric ozone destruction (due to the chlorine monoxide) hence the importance of its study. In this work, the results of the measurements made in Marambio Argentinean Antarctic Base (64,233 S; 56,616 W; 197 m amsl) during the months of January and February of 2008, using a passive type atmospheric remote sensing system, are presented. The system consists on an optical fiber (400 μm core diameter and 6 m of longitude) and a portable spectral analyzer (spectrometer HR4000, Ocean Optics). The device measures the diffuse solar spectral irradiance in the UV-VIS range (290-650 nm), collected and transferred by the optical fiber pointing to the zenith. The density of the NO2 vertical column is obtained starting from the spectra by applying the DOAS technique (Differential Optical Absorption Spectroscopy). The system and the technique allow the simultaneous measurement of different species of interest in a variety of meteorological conditions. The obtained vertical columns are compared to co-locate measurements performed with EVA, a visible absorption spectrometer from the Instituto Nacional de Técnica Aeroespacial (INTA), Spain.2). Dicho gas actúa como agente limitante en la destrucción del ozono estratosférico producida por el monóxido de cloro, de ahí la importancia de su estudio. En este trabajo se presentan los resultados de las mediciones efectuadas en la Base Antártica Argentina Marambio (64° 14’ 25’’ Sur; 56° 37’ 21’’ Oeste), durante los meses de enero y febrero de 2008, utilizando un sistema de sensado remoto atmosférico de tipo pasivo. El sistema consiste en una fibra óptica de 400 μm de núcleo y 6 m de longitud y un analizador espectral portátil (espectrómetro HR4000, Ocean Optics). El dispositivo mide la irradiancia espectral solar difusa en el rango UV-VIS (290-650 nm), colectada y transferida por la fibra óptica apuntanda al cenit. La densidad de la columna vertical de NO2 se obtiene a partir de los espectros aplicando la técnica DOAS (Differential Optical Absorption Spectroscopy). El sistema y la técnica permiten medir diferentes especies de interés de forma simultánea en una variedad de condiciones meteorológicas. Las columnas verticales obtenidas se comparan con mediciones del mismo sitio realizadas con el instrumento EVA, un espectrómetro de absorción en el visible, del Instituto Nacional de Técnica Aeroespacial, INTA, España. Abstract A number of chemical species present in the stratosphere in small concentrations of parts for billion and even smaller, contribute significantly to its chemical balance. One of the main stratospheric trace gases is the nitrogen dioxide (NO2). This gas acts as a restrictive agent in the stratospheric ozone destruction (due to the chlorine monoxide) hence the importance of its study. In this work, the results of the measurements made in Marambio Argentinean Antarctic Base (64,233 S; 56,616 W; 197 m amsl) during the months of January and February of 2008, using a passive type atmospheric remote sensing system, are presented. The system consists on an optical fiber (400 μm core diameter and 6 m of longitude) and a portable spectral analyzer (spectrometer HR4000, Ocean Optics). The device measures the diffuse solar spectral irradiance in the UV-VIS range (290-650 nm), collected and transferred by the optical fiber pointing to the zenith. The density of the NO2 vertical column is obtained starting from the spectra by applying the DOAS technique (Differential Optical Absorption Spectroscopy). The system and the technique allow the simultaneous measurement of different species of interest in a variety of meteorological conditions. The obtained vertical columns are compared to co-locate measurements performed with EVA, a visible absorption spectrometer from the Instituto Nacional de Técnica Aeroespacial (INTA), Spain.2 se obtiene a partir de los espectros aplicando la técnica DOAS (Differential Optical Absorption Spectroscopy). El sistema y la técnica permiten medir diferentes especies de interés de forma simultánea en una variedad de condiciones meteorológicas. Las columnas verticales obtenidas se comparan con mediciones del mismo sitio realizadas con el instrumento EVA, un espectrómetro de absorción en el visible, del Instituto Nacional de Técnica Aeroespacial, INTA, España. Abstract A number of chemical species present in the stratosphere in small concentrations of parts for billion and even smaller, contribute significantly to its chemical balance. One of the main stratospheric trace gases is the nitrogen dioxide (NO2). This gas acts as a restrictive agent in the stratospheric ozone destruction (due to the chlorine monoxide) hence the importance of its study. In this work, the results of the measurements made in Marambio Argentinean Antarctic Base (64,233 S; 56,616 W; 197 m amsl) during the months of January and February of 2008, using a passive type atmospheric remote sensing system, are presented. The system consists on an optical fiber (400 μm core diameter and 6 m of longitude) and a portable spectral analyzer (spectrometer HR4000, Ocean Optics). The device measures the diffuse solar spectral irradiance in the UV-VIS range (290-650 nm), collected and transferred by the optical fiber pointing to the zenith. The density of the NO2 vertical column is obtained starting from the spectra by applying the DOAS technique (Differential Optical Absorption Spectroscopy). The system and the technique allow the simultaneous measurement of different species of interest in a variety of meteorological conditions. The obtained vertical columns are compared to co-locate measurements performed with EVA, a visible absorption spectrometer from the Instituto Nacional de Técnica Aeroespacial (INTA), Spain.2). This gas acts as a restrictive agent in the stratospheric ozone destruction (due to the chlorine monoxide) hence the importance of its study. In this work, the results of the measurements made in Marambio Argentinean Antarctic Base (64,233 S; 56,616 W; 197 m amsl) during the months of January and February of 2008, using a passive type atmospheric remote sensing system, are presented. The system consists on an optical fiber (400 μm core diameter and 6 m of longitude) and a portable spectral analyzer (spectrometer HR4000, Ocean Optics). The device measures the diffuse solar spectral irradiance in the UV-VIS range (290-650 nm), collected and transferred by the optical fiber pointing to the zenith. The density of the NO2 vertical column is obtained starting from the spectra by applying the DOAS technique (Differential Optical Absorption Spectroscopy). The system and the technique allow the simultaneous measurement of different species of interest in a variety of meteorological conditions. The obtained vertical columns are compared to co-locate measurements performed with EVA, a visible absorption spectrometer from the Instituto Nacional de Técnica Aeroespacial (INTA), Spain.. In this work, the results of the measurements made in Marambio Argentinean Antarctic Base (64,233 S; 56,616 W; 197 m amsl) during the months of January and February of 2008, using a passive type atmospheric remote sensing system, are presented. The system consists on an optical fiber (400 μm core diameter and 6 m of longitude) and a portable spectral analyzer (spectrometer HR4000, Ocean Optics). The device measures the diffuse solar spectral irradiance in the UV-VIS range (290-650 nm), collected and transferred by the optical fiber pointing to the zenith. The density of the NO2 vertical column is obtained starting from the spectra by applying the DOAS technique (Differential Optical Absorption Spectroscopy). The system and the technique allow the simultaneous measurement of different species of interest in a variety of meteorological conditions. The obtained vertical columns are compared to co-locate measurements performed with EVA, a visible absorption spectrometer from the Instituto Nacional de Técnica Aeroespacial (INTA), Spain.2 vertical column is obtained starting from the spectra by applying the DOAS technique (Differential Optical Absorption Spectroscopy). The system and the technique allow the simultaneous measurement of different species of interest in a variety of meteorological conditions. The obtained vertical columns are compared to co-locate measurements performed with EVA, a visible absorption spectrometer from the Instituto Nacional de Técnica Aeroespacial (INTA), Spain.