HR: 0830h
AN: P41B-0414 [PDF]
TI: Sensitivity to environmental properties in globally averaged synthetic spectra of Earth
AU: * Tinetti, G
EM: tinetti@ipac.caltech.edu
AF: NRC/JPL, 4800 Oak Grove Drive, Pasadena, CA 91109 United States
AU: Meadows, V S
EM: vsm@ipac.caltech.edu
AF: JPL, 4800 Oak Grove Drive, Pasadena, CA 91109 United States
AU: Crisp, D
EM: David.Crisp@jpl.nasa.gov
AF: JPL, 4800 Oak Grove Drive, Pasadena, CA 91109 United States
AU: Fong, W
EM: william@its.caltech.edu
AF: Caltech, 1200 California, Pasadena, CA 91106 United States
AU: Velusamy, T
EM: velu@rams.jpl.nasa.gov
AF: JPL, 4800 Oak Grove Drive, Pasadena, CA 91109 United States
AU: Fishbein, E
EM: eff@airs1.jpl.nasa.gov
AF: JPL, 4800 Oak Grove Drive, Pasadena, CA 91109 United States
AB:
We are using computer models to explore the observational sensitivity to changes in atmospheric and surface properties, and
the detectability of biosignatures, in the globally averaged spectrum of the Earth. Using AIRS (Atmospheric Infrared Sounder)
data, as input on atmospheric and surface properties, we have generated spatially resolved high-resolution synthetic spectra
using the SMART radiative transfer model (developed by D. Crisp), for a variety of conditions, from the UV to the far-IR
(beyond the range
of current Earth-based satellite data). We have then averaged over the visible disk for a number of different viewing
geometries to quantify the sensitivity to surface types and atmospheric features as a function of viewing geometry, and
spatial and spectral resolution. These results have been processed with an instrument simulator to improve our understanding
of the detectable characteristics of Earth-like planets as viewed by the first (and probably second) generation extrasolar
terrestrial planet detection and characterization missions (Terrestrial Planet Finder/Darwin and Life finder). This model
can also be used to analyze Earth-shine data for detectability of planetary characteristics in disk-averaged spectra.
UR: http://www.vpl.ipac.caltech.edu
DE: 0315 Biosphere/atmosphere interactions
SC: Planetary Sciences [P]
MN: 2003 Fall Meeting