Preprints
https://doi.org/10.5194/amt-2021-290
https://doi.org/10.5194/amt-2021-290

  05 Oct 2021

05 Oct 2021

Review status: this preprint is currently under review for the journal AMT.

Simulated Multispectral Temperature and Atmospheric Composition Retrievals for the JPL GEO-IR Sounder

Vijay Natraj1, Ming Luo1, Jean-Francois Blavier1, Vivienne H. Payne1, Derek J. Posselt1, Stanley P. Sander1, Zhao-Cheng Zeng2,3, Jessica L. Neu1, Denis Tremblay4, Longtao Wu1, Jacola A. Roman1, Yen-Hung Wu1, and Leonard I. Dorsky1 Vijay Natraj et al.
  • 1Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA
  • 2Joint Institute for Regional Earth System Science and Engineering, University of California, Los Angeles, CA 90095, USA
  • 3Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA
  • 4Global Science Technology, USA

Abstract. Satellite measurements enable quantification of atmospheric temperature, humidity, and trace gas vertical profiles. The majority of current instruments operate on polar orbiting satellites and either in the thermal/mid-wave or in the shortwave infrared spectral regions. We present a new multispectral instrument concept for improved measurements from geostationary orbit (GEO) with sensitivity to the boundary layer. The JPL GEO-IR sounder, which is an imaging Fourier Transform Spectrometer, uses a wide spectral range (1–15.4 μm), encompassing both reflected solar and thermal emission bands to improve sensitivity to the lower troposphere and boundary layer. We perform retrieval simulations for both clean and polluted scenarios that also encompass different temperature and humidity profiles. The results illustrate the benefits of combining shortwave and thermal infrared measurements. In particular, the former adds information in the boundary layer, while the latter helps to separate near-surface and mid-tropospheric variability. The performance of the JPL GEO-IR sounder is similar to or better than currently operational instruments. The proposed concept is expected to improve weather forecasting, severe storm tracking and forecasting, and also benefit local and global air quality and climate research.

Vijay Natraj et al.

Status: open (until 10 Nov 2021)

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Vijay Natraj et al.

Vijay Natraj et al.

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Short summary
High-fidelity monitoring and forecast of air quality and the hydrological cycle requires understanding the vertical distribution of temperature, humidity, and trace gases at high spatiotemporal resolution. We describe a new instrument concept, called the JPL GEO-IR Sounder, that would provide this information for the first time from a single instrument platform. Simulations demonstrate the benefits of combining measurements from multiple wavelengths for this purpose from geostationary orbit.