Evaluation and improvement of an iterative scattering correction scheme for in situ absorption and attenuation measurements

David McKee; Jacek Piskozub; Rüdiger  Röttgers; Rick A. Reynolds

doi:10.1175/JTECH-D-12-00150.1

Evaluation and improvement of an iterative scattering correction scheme for in situ absorption and attenuation measurements

David McKee, Jacek Piskozub, Rüdiger Röttgers, Rick A. Reynolds

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Abstract

The performance of several scattering correction schemes for reflecting-tube absorption and beam attenuation measurements is evaluated with data collected in European shelf seas. Standard scattering correction procedures for absorption measurements perform poorly because of nonzero absorption in the near infrared and wavelength-dependent scattering phase functions. A previously described iterative correction procedure based on Monte Carlo simulations of the Western Environmental Technologies Laboratories (WET Labs) ac-9 and independent estimates of particle backscattering initially performs poorly, but is greatly improved when realistic losses at flow-tube walls are incorporated into the model. The updated Monte Carlo scattering correction provides excellent agreement with independent absorption and attenuation measurements made with a point-source integrating-cavity absorption meter (PSICAM) and a Laser In Situ Scattering and Transmissometer (LISST, Sequoia Scientific), respectively. Implications for historic datasets and requirements for application to future datasets are discussed.

Original language	English
Pages (from-to)	1527–1541
Number of pages	15
Journal	Journal of Atmospheric and Oceanic Technology
Volume	30
Issue number	7
DOIs	https://doi.org/10.1175/JTECH-D-12-00150.1
Publication status	Published - Jul 2013

Keywords

absorption
optical properties
in situ oceanic observations
instrumentation
sensors

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10.1175/JTECH-D-12-00150.1

McKee-etal-JAOT2013-iterative-scattering-correction-scheme-for-in-situ-absorptionAccepted author manuscript, 1.78 MB

http://journals.ametsoc.org/loi/atot

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Observing optically complex oceans in situ and from space
McKee, D.
NERC (Natural Environment Research Council)
1/12/07 → 30/11/12
Project: Research

Cite this

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title = "Evaluation and improvement of an iterative scattering correction scheme for in situ absorption and attenuation measurements",

abstract = "The performance of several scattering correction schemes for reflecting-tube absorption and beam attenuation measurements is evaluated with data collected in European shelf seas. Standard scattering correction procedures for absorption measurements perform poorly because of nonzero absorption in the near infrared and wavelength-dependent scattering phase functions. A previously described iterative correction procedure based on Monte Carlo simulations of the Western Environmental Technologies Laboratories (WET Labs) ac-9 and independent estimates of particle backscattering initially performs poorly, but is greatly improved when realistic losses at flow-tube walls are incorporated into the model. The updated Monte Carlo scattering correction provides excellent agreement with independent absorption and attenuation measurements made with a point-source integrating-cavity absorption meter (PSICAM) and a Laser In Situ Scattering and Transmissometer (LISST, Sequoia Scientific), respectively. Implications for historic datasets and requirements for application to future datasets are discussed.",

keywords = "absorption, optical properties, in situ oceanic observations, instrumentation, sensors",

author = "David McKee and Jacek Piskozub and R{\"u}diger R{\"o}ttgers and Reynolds, {Rick A.}",

note = "{\textcopyright} Copyright 2013 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act September 2010 Page 2 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Act (17 USC §108, as revised by P.L. 94-553) does not require the AMS{\textquoteright}s permission. Republication, systematic reproduction, posting in electronic form, such as on a web site or in a searchable database, or other uses of this material, except as exempted by the above statement, requires written permission or a license from the AMS. Additional details are provided in the AMS Copyright Policy, available on the AMS Web site located at (http://www.ametsoc.org/) or from the AMS at 617-227-2425 or copyrights@ametsoc.org.",

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AU - Reynolds, Rick A.

N1 - © Copyright 2013 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act September 2010 Page 2 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Act (17 USC §108, as revised by P.L. 94-553) does not require the AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a web site or in a searchable database, or other uses of this material, except as exempted by the above statement, requires written permission or a license from the AMS. Additional details are provided in the AMS Copyright Policy, available on the AMS Web site located at (http://www.ametsoc.org/) or from the AMS at 617-227-2425 or copyrights@ametsoc.org.

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AB - The performance of several scattering correction schemes for reflecting-tube absorption and beam attenuation measurements is evaluated with data collected in European shelf seas. Standard scattering correction procedures for absorption measurements perform poorly because of nonzero absorption in the near infrared and wavelength-dependent scattering phase functions. A previously described iterative correction procedure based on Monte Carlo simulations of the Western Environmental Technologies Laboratories (WET Labs) ac-9 and independent estimates of particle backscattering initially performs poorly, but is greatly improved when realistic losses at flow-tube walls are incorporated into the model. The updated Monte Carlo scattering correction provides excellent agreement with independent absorption and attenuation measurements made with a point-source integrating-cavity absorption meter (PSICAM) and a Laser In Situ Scattering and Transmissometer (LISST, Sequoia Scientific), respectively. Implications for historic datasets and requirements for application to future datasets are discussed.

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KW - optical properties

KW - in situ oceanic observations

KW - instrumentation

KW - sensors

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ER -

Evaluation and improvement of an iterative scattering correction scheme for in situ absorption and attenuation measurements

Abstract

Keywords

Access to Document

Observing optically complex oceans in situ and from space

Cite this