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Proceedings Paper

Requirements for an Advanced Low Earth Orbit (LEO) Sounder (ALS) for improved regional weather prediction and monitoring of greenhouse gases
Author(s): Thomas S. Pagano; Moustafa T. Chahine; Joel Susskind
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Paper Abstract

Hyperspectral infrared atmospheric sounders (e.g. the Atmospheric Infrared Sounder (AIRS) on Aqua and the Infrared Atmospheric Sounding Interferometer (IASI) on MetOp) provide highly accurate temperature and water vapor profiles in the lower to upper troposphere. These systems are vital operational components of our National Weather Prediction system and the AIRS has demonstrated over 6 hrs of forecast improvement on the 5 day operational forecast1. Despite the success in the mid troposphere to lower stratosphere, a reduction in sensitivity and accuracy has been seen in these systems in the boundary layer over land. In this paper we demonstrate the potential improvement associated with higher spatial resolution (1km vs currently 13.5 km) on the accuracy of boundary layer products with an added consequence of higher yield of cloud free scenes. This latter feature is related to the number of samples that can be assimilated and has also shown to have a significant impact on improving forecast accuracy. We also present a set of frequencies and resolutions that will improve vertical resolution of temperature and water vapor and trace gas species throughout the atmosphere. Development of an Advanced Low Earth Orbit (LEO) Sounder (ALS) with these improvements will improve weather forecast at the regional scale and of tropical storms and hurricanes. Improvements are also expected in the accuracy of the water vapor and cloud properties products, enhancing process studies and providing a better match to the resolution of future climate models. The improvements of technology required for the ALS are consistent with the current state of technology as demonstrated in NASA Instrument Incubator Program and NOAA's Hyperspectral Environmental Suite (HES) formulation phase development programs.

Paper Details

Date Published: 8 December 2008
PDF: 7 pages
Proc. SPIE 7152, Remote Sensing of the Atmosphere and Clouds II, 71520E (8 December 2008); doi: 10.1117/12.804908
Show Author Affiliations
Thomas S. Pagano, Jet Propulsion Lab. (United States)
Moustafa T. Chahine, Jet Propulsion Lab. (United States)
Joel Susskind, NASA Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 7152:
Remote Sensing of the Atmosphere and Clouds II
Graeme L. Stephens; Takashi Y. Nakajima, Editor(s)

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