Accelerating the RTTOV-7 radiative transfer model on graphics processing units

Jarno Mielikainen; Bormin Huang; Allen H. Huang; Roger Saunders

doi:10.1117/12.863272

24 August 2010 Accelerating the RTTOV-7 radiative transfer model on graphics processing units

Jarno Mielikainen, Bormin Huang, Allen H. Huang, Roger Saunders

Proceedings Volume 7810, Satellite Data Compression, Communications, and Processing VI; 781012 (2010) https://doi.org/10.1117/12.863272
Event: SPIE Optical Engineering + Applications, 2010, San Diego, California, United States

Abstract

We develop a Graphics Processing Unit (GPU)-based high-performance RTTOV-7 forward model. The RTTOV forward model performs the fast computation of the radiances, brightness temperatures, overcast radiances, surface to space transmittances, surface emissivities and pressure level to space transmittances for a given profile vector. A special optimized high performance CUDA kernel was used for multi-profile processing. The difference between single-profile and multi-profile kernels is that in a multi-profile kernel each thread is responsible for computing the results for a single channel in several profiles. Multi-profile processing gave over two fold increase in processing speed compared to singleprofile processing. Using a GPU processing we reached promising speedups of 170x and 334x for single-profile and multi-profile processing, respectively. The significant 334x speedup means that the proposed GPU-based highperformance forward model is able to compute one day's amount of 1,296,000 Infrared Atmospheric Sounding Interferometer (IASI) spectra nearly within 12 minutes, whereas the original CPU-based version will impractically take nearly 3 days.

Citation Download Citation

Jarno Mielikainen, Bormin Huang, Allen H. Huang, and Roger Saunders "Accelerating the RTTOV-7 radiative transfer model on graphics processing units", Proc. SPIE 7810, Satellite Data Compression, Communications, and Processing VI, 781012 (24 August 2010); https://doi.org/10.1117/12.863272

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KEYWORDS

Radiative transfer

Atmospheric modeling

Graphics processing units

Thermal modeling

Clouds

Infrared radiation

Ocean optics

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