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Proceedings Paper

Operational correction and validation of the VIIRS TEB longwave infrared band calibration bias during blackbody temperature changes
Author(s): Wenhui Wang; Changyong Cao; Alex Ignatov; Zhenglong Li; Likun Wang; Bin Zhang; Slawomir Blonski; Jun Li
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Paper Abstract

The Suomi NPP VIIRS thermal emissive bands (TEB) have been performing very well since data became available on January 20, 2012. The longwave infrared bands at 11 and 12 um (M15 and M16) are primarily used for sea surface temperature (SST) retrievals. A long standing anomaly has been observed during the quarterly warm-up-cool-down (WUCD) events. During such event daytime SST product becomes anomalous with a warm bias shown as a spike in the SST time series on the order of 0.2 K. A previous study (CAO et al. 2017) suggested that the VIIRS TEB calibration anomaly during WUCD is due to a flawed theoretical assumption in the calibration equation and proposed an Ltrace method to address the issue. This paper complements that study and presents operational implementation and validation of the Ltrace method for M15 and M16. The Ltrace method applies bias correction during WUCD only. It requires a simple code change and one-time calibration parameter look-up-table update. The method was evaluated using colocated CrIS observations and the SST algorithm. Our results indicate that the method can effectively reduce WUCD calibration anomaly in M15, with residual bias of ~0.02 K after the correction. It works less effectively for M16, with residual bias of ~0.04 K. The Ltrace method may over-correct WUCD calibration biases, especially for M16. However, the residual WUCD biases are small in both bands. Evaluation results using the SST algorithm show that the method can effectively remove SST anomaly during WUCD events.

Paper Details

Date Published: 5 September 2017
PDF: 9 pages
Proc. SPIE 10402, Earth Observing Systems XXII, 104021P (5 September 2017); doi: 10.1117/12.2272377
Show Author Affiliations
Wenhui Wang, Earth Resource Technology, Inc. (United States)
Changyong Cao, STAR/NESDIS (United States)
Alex Ignatov, STAR/NESDIS (United States)
Zhenglong Li, Univ. of Wisconsin-Madison (United States)
Likun Wang, Univ. of Maryland, College Park (United States)
Bin Zhang, Earth Resource Technology, Inc. (United States)
Univ. of Maryland, College Park (United States)
Slawomir Blonski, Earth Resource Technology, Inc. (United States)
Jun Li, Univ. of Wisconsin-Madison (United States)

Published in SPIE Proceedings Vol. 10402:
Earth Observing Systems XXII
James J. Butler; Xiaoxiong (Jack) Xiong; Xingfa Gu, Editor(s)

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