Radiative Transfer and Error Analysis Methods for the MSL REMS Ground Temperature Sensors

Alejandro Soto, F. Javier Martin-Torres, Ian McEwan, Mark Richardson

Research output: Contribution to conferencePaper

Abstract

The Rover Environmental Monitoring Station (REMS) on the Mars Science Laboratory (MSL) offers the opportunity to explore the near surface atmospheric boundary layer (ABL) over an extended region of the Martian surface. The atmospheric boundary layer plays an important role in the general circulation and the local atmospheric dynamics of Mars. In both cases, the ABL controls the coupling of the atmosphere and the surface [Zurek, et al., 1992]. This coupling is exhibited in the energy exchange between the near surface regolith and the near surface atmosphere and is driven by the solar insolation. Ground temperature sensors (GTS) on REMS provide the data needed to study both the thermal inertia properties of the regolith and rocks beneath the MSL rover and to study the conditions for convection in the near surface atmospheric boundary layer. The GTS includes three thermopile detectors, with infrared bands of 8-14 µm, 15 µm, and 16-20 µm [Gómez-Elvira et al., 2009]. The three sensors are clustered in a single location on the MSL mast and have a common field of view on the surface of Mars allowing the three sensors to be used in combination. The 15 µm sounds the atmosphere between the sensors and the surface. With a calibrated weighting function, this sensor will measure the temperature of the atmosphere just above the surface. The 8-14 µm and 16-20 µm sensors both measure the surface temperature, but by working on both sides of the 15 µm CO2 band, the variation in emissivity of the surface minerals across the thermal wavelengths can be factored into the surface temperature calculations. Using the Full Transfer By Optimized LINe-by-line (FUTBOLIN) code [Martin-Torres and Mlynczak, 2005] we have developed an energy balance and radiative transfer retrieval method for the REMS GTS. With the Mars Weather Research and Forcasting (MarsWRF) model, we run large eddy simulations (LES) to model ground temperatures and near surface air temperatures. Using these LES temperatures, we can test the GTS retrieval process, including an assessment of the sources of errors in the retrieval process. By using the LES temperatures as synthetic data, we assess the perfomance of the REMS GTS as well as determine, through the error analysis, the calibration data critical path in the spectral retrieval process. Reference: Martin-Torres, F. J. and M. G. Mlynczak, Application of FUTBOLIN (FUll Transfer By Ordinary Line-by-Line) to the analysis of the solar system and extrasolar planetary atmospheres, Bulletin of the American Astronomical Society, Vol. 37, p.1566, 2005

Original languageEnglish
Publication statusPublished - 1 May 2010

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