Data / Science Data Products / VAPs

AERINF

AERI Noise Filtered

Baseline VAP, Evaluation VAP, External VAP, Guest

This quicklook image shows the time series of the radiance in window channels for Channel 1 (900 cm-1) and Channel 2 (2600 cm-1) on August 22, 2022, during the SAIL campaign. — This quicklook image shows the time series of the radiance in window channels for Channel 1 (900 cm-1) and Channel 2 (2600 cm-1) on August 22, 2022, during the Surface Atmosphere Integrated Field Laboratory (SAIL) campaign.

The ARM atmospheric emitted radiance interferometer (AERI) collects a sky spectrum every 20 seconds, but the high temporal resolution results in a large random noise in the sky spectra. The AERINF value-added product (VAP) uses the high correlation in the observed radiance across the spectrum to reduce the uncorrelated random error in the data using principal component analysis. AERINF automatically determines the appropriate number of principal components to use in the reconstruction to eliminate as much random noise as possible.

A significant reduction in the uncorrelated random error in the data has been proven for both regular temporal data (pre-2008) and rapid-sample data. For more details, see A Principal Component Analysis Noise Filter Value-Added Procedure to Remove Uncorrelated Noise from Atmospheric Emitted Radiance Interferometer (AERI) Observations.