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Revista Brasileira de Meteorologia

Print version ISSN 0102-7786On-line version ISSN 1982-4351

Abstract

DIAS NETO, Jose; THOMAZ JUNIOR, José Celso  and  URBANO NETO, Domingos Fernandes. Mathematical Adjustment Method for Validation of Longwave Radiation Sensor Measurements. Rev. bras. meteorol. [online]. 2016, vol.31, n.1, pp.37-44. ISSN 0102-7786.  http://dx.doi.org/10.1590/0102-778620140022.

Hereby is presented a methodology to correct observations of Downwelling Longwave Radiation (DLR) generated by surface stations. It consists in the application of the least squares method to find coefficients (ks) of PIR Eppley (EP) and CGR4 Kipp & Zonen (KZ) sensors, and reprocessing of time series. The evaluation of the methodology used data obtained in an experiment conducted in the Meteorological Instrumentation Laboratory - CPTEC / INPE. The application of statistical tests in the data series, with and without correction shows a significant reduction of the Root Mean Square Error, which went from 9,02 to 0,43 W/m2 for the EP sensor and 4,11 to 1,21 W / m2 for KZ; bias decreased from 0,50 to −7,99 W/m2 (EP) and 3,53 to 0,27 W/m2 (KZ). A CG4 sensor (KZ) of the calibrated reference Physikalisch-Meteorologiches Observatorium Davos (PMOD) with traceability was used.

Keywords : longwave radiation; pyrgeometer.

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