Preprint Technical Note Version 1 Preserved in Portico This version is not peer-reviewed

Global Ocean Studies from CALIOP/CALIPSO by Removing Polarization Crosstalk Effects

Xiaomei Lu
* ORCID logo ,
Yongxiang Hu
,
Ali Omar
,
Rosemary Baize
,
Mark Vaughan
ORCID logo ,
Sharon Rodier
,
Jayanta Kar
,
Brian Getzewich
,
Patricia Lucker
,
Charles Trepte
,
Chris Hostetler
,
David Winker
Version 1 : Received: 8 June 2021 / Approved: 8 June 2021 / Online: 8 June 2021 (13:05:13 CEST)

A peer-reviewed article of this Preprint also exists.

Lu, X.; Hu, Y.; Omar, A.; Baize, R.; Vaughan, M.; Rodier, S.; Kar, J.; Getzewich, B.; Lucker, P.; Trepte, C.; Hostetler, C.; Winker, D. Global Ocean Studies from CALIOP/CALIPSO by Removing Polarization Crosstalk Effects. Remote Sens. 2021, 13, 2769. Lu, X.; Hu, Y.; Omar, A.; Baize, R.; Vaughan, M.; Rodier, S.; Kar, J.; Getzewich, B.; Lucker, P.; Trepte, C.; Hostetler, C.; Winker, D. Global Ocean Studies from CALIOP/CALIPSO by Removing Polarization Crosstalk Effects. Remote Sens. 2021, 13, 2769.

Abstract

Recent studies indicate that the Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) aboard the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) satellite provides valuable information about ocean phytoplankton distributions. CALIOP’s attenuated backscatter coefficients, measured at 532 nm in receiver channels oriented parallel and perpendicular to the laser’s linear polarization plane, are significantly improved in the Version 4 data product. However, due to non-ideal instrument effects, a small fraction of the backscattered optical power polarized parallel to the receiver polarization reference plane is misdirected into the perpendicular channel, and vice versa. This effect, known as polarization crosstalk, typically causes the measured perpendicular signal to be higher than its true value and the measured parallel signal to be lower than its true value. Therefore, the ocean optical properties derived directly from CALIOP’s measured signals will be biased if the polarization crosstalk effect is not taken into account. This paper presents methods that can be used to estimate the CALIOP crosstalk effects from on-orbit measurements. The global ocean depolarization ratios calculated both before and after removing the crosstalk effects are compared. Using CALIOP crosstalk-corrected signals is highly recommended for all ocean subsurface studies.

Keywords

CALIPSO; space lidar; ocean; depolarization ratio; crosstalk

Subject

Environmental and Earth Sciences, Atmospheric Science and Meteorology

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Download PDF

Comments (0)

We encourage comments and feedback from a broad range of readers. See criteria for comments and our Diversity statement.

Leave a public comment
Send a private comment to the author(s)
* All users must log in before leaving a comment
Views 0
Downloads 0
Comments 0
Metrics 0
Get PDF Cite Share 0
Bookmark BibSonomy Mendeley Reddit Delicious
×
Alerts
Notify me about updates to this article or when a peer-reviewed version is published.
We use cookies on our website to ensure you get the best experience.
Read more about our cookies here.