Operational correction and validation of the VIIRS TEB longwave infrared band calibration bias during blackbody temperature changes

Wenhui Wang; Changyong Cao; Alex Ignatov; Zhenglong Li; Likun Wang; Bin Zhang; Slawomir Blonski; Jun Li

doi:10.1117/12.2272377

5 September 2017 Operational correction and validation of the VIIRS TEB longwave infrared band calibration bias during blackbody temperature changes

Wenhui Wang, Changyong Cao, Alex Ignatov, Zhenglong Li, Likun Wang, Bin Zhang, Slawomir Blonski, Jun Li

Author Affiliations +

Proceedings Volume 10402, Earth Observing Systems XXII; 104021P (2017) https://doi.org/10.1117/12.2272377
Event: SPIE Optical Engineering + Applications, 2017, San Diego, California, United States

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.

Citation Download Citation

Wenhui Wang, Changyong Cao, Alex Ignatov, Zhenglong Li, Likun Wang, Bin Zhang, Slawomir Blonski, and Jun Li "Operational correction and validation of the VIIRS TEB longwave infrared band calibration bias during blackbody temperature changes", Proc. SPIE 10402, Earth Observing Systems XXII, 104021P (5 September 2017); https://doi.org/10.1117/12.2272377

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available