Comparison between measurements of SO2 emission fluxes by means of COSPEC and MODIS, and their complementarily in the volcanic assessment: Case study in the Popocatepetl volcano (Mexico)
Por:
Carlos Jimenez-Escalona, Jose, Monsivais-Huertero, Alejandro, Delgado-Granados, Hugo, Maciel Huerta-Chavez, Oliver
Publicada:
1 ene 2018
Categoría:
Earth and planetary sciences (miscellaneous)
Resumen:
One of the main elements monitored in volcanic emissions is SO2 due to
the contrast of concentrations between the volcanos compared to the
background of the atmosphere Different methodologies have been developed
from remote sensing techniques from the ground and from space In
particular, the COSPEC technique has been used efficiently from
terrestrial vehicles, allowing the emission rate of SO2 with estimated
relative errors of +/- 13% to +/- 42% to be obtained However, the
logistics required to carry out continuous measurement campaigns in the
Popocatepetl area, allows exclusively 2 or 3 measurements a month and
only during daylight hours. Another type of methodology based an remote
sensing is the processing of satellite images in the thermal infrared In
this case, the use of MODIS images allows obtaining daily SO2
information both in images taken at daylight hours or during the night
period which gives a maximum temporal resolution of images fig the
sensor in the study area (maximum 4 images per day). In order to
construct time series from both techniques, the flux of SO2 derived from
the COSPEC sensor are used as a reference, which allows the MODIS image
identification within the area of the plume that was sampled with the
COSPEC sensor. ate aim to propose an adjustment methodology to
reconstruct the information with the aforementioned values. Between
November 2006 to February 2007 in the Popocatepetl volcano area, we
found a good witch between the two techniques; which indicates that the
adjustment methodology proposal to obtain data calibration equations
could he applied during periods of time when simultaneous data from both
sensors are available.
Filiaciones:
Carlos Jimenez-Escalona, Jose:
Inst Politecn Nacl, Escuela Super Ingn Mecan & Elect, Unidad Ticoman, Av Ticoman 600, Cdmx 07340, Mexico
Monsivais-Huertero, Alejandro:
Inst Politecn Nacl, Escuela Super Ingn Mecan & Elect, Unidad Ticoman, Av Ticoman 600, Cdmx 07340, Mexico
Delgado-Granados, Hugo:
Univ Nacl Autonoma Mexico, Inst Geofis, Circuito Invest Cient S-N,Ciudad Univ, Cdmx 04510, Mexico
Maciel Huerta-Chavez, Oliver:
Inst Politecn Nacl, Escuela Super Ingn Mecan & Elect, Unidad Ticoman, Av Ticoman 600, Cdmx 07340, Mexico
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