Short Wave upwelling Radiative Flux (SWupRF) within NIR range for the selected greenhouse wavelength bands of O2, H2O, CO2 and CH4 by Argus 1000 along with GENSPECT line by line radiative transfer model

TL;DR

This study develops an algorithm to estimate short wave upwelling radiative flux in the near-infrared range using Argus 1000 satellite data and GENSPECT radiative transfer modeling, comparing synthetic and observed fluxes over four years.

Contribution

The paper introduces a new algorithm combining satellite observations and line-by-line radiative transfer modeling to analyze SWupRF variations for specific greenhouse gases in the NIR range.

Findings

Synthetic SWupRF ranges from 0.3950 to 1.650 W/m2.

Observed SWupRF ranges from 0.10 to 3.15 W/m2.

Model captures temperature variations of 1 to 32 K with gas concentration changes.

Abstract

This new study develops an algorithm for Short Wave upwelling Radiative Flux (SWupRF) for the spectral variations within near infrared (NIR) from 1100 to 1700 nm wavelength band based on remote sensing data set of Argus 1000 micro-spectrometer observations. We calculate the SWupRF by investigating the total radiative flux due to O2, H2O, CO2 and CH4 and also by the individual gas within the selected wavelength bands of interest. A GENSPECT synthetic line by line radiative transfer model is applied to perform radiative transfer simulations to calculate the radiative flux by varying surface albedo, mixing ratios of the selected greenhouse gases, surface temperature, solar sun and zenith angles with different latitude and longitude of the instrument. Finally, the SWupRFsyn estimated from GENSPECT was compared with SWupRFobs from Argus 1000 over a period of four years (2009 and 2013) covering all seasons. We calculate and compare both the synthetic and real measured observed data set. The synthetic model gives SWupRFsyn within the range of [0.3950 to 1.650] W/m2 and the selected Argus observed model gives SWupRFobs within the range of [0.10 to 3.15] W/m2. The simulated range of synthetic model also represents 1 to 32 K rise of temperature within the different concentration of water vapor and other gases. The authors determined that the satellite observed data of week 75 pass 43 & week 08 pass 61 showing minimum 0.850 [0.10 to 1.60] W/m2 and maximum 1.65 [0.12 to 3.15] W/m2 respectively.