CASPER: Coupled Air–Sea Processes and Electromagnetic Ducting Research

Qing Wang Naval Postgraduate School, Monterey, California

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Denny P. Alappattu Naval Postgraduate School, Monterey, and Moss Landing Marine Laboratories, Moss Landing, California

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Stephanie Billingsley Naval Surface Warfare Center Dahlgren Division, Dahlgren, Virginia

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Byron Blomquist University of Colorado Boulder, and NOAA/ESRL, Boulder, Colorado

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Robert J. Burkholder The Ohio State University, Columbus, Ohio

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Adam J. Christman University of Notre Dame, Notre Dame, Indiana

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Edward D. Creegan U.S. Army Research Laboratory, Adelphi, Maryland

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Tony de Paolo Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California

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Daniel P. Eleuterio Office of Naval Research, Arlington, Virginia

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Harindra Joseph S. Fernando University of Notre Dame, Notre Dame, Indiana

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Kyle B. Franklin Naval Postgraduate School, Monterey, California

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Andrey A. Grachev University of Colorado Boulder, and NOAA/ESRL, Boulder, Colorado

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Tracy Haack U.S. Naval Research Laboratory, Monterey, California

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Thomas R. Hanley Applied Physics Laboratory, Johns Hopkins University, Laurel, Maryland

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Christopher M. Hocut U.S. Army Research Laboratory, Adelphi, Maryland

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Teddy R. Holt U.S. Naval Research Laboratory, Monterey, California

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Kate Horgan Naval Surface Warfare Center Dahlgren Division, Dahlgren, Virginia

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Haflidi H. Jonsson Naval Postgraduate School, Monterey, California

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Robert A. Hale Naval Postgraduate School, Monterey, California

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John A. Kalogiros National Observatory of Athens, Athens, Greece

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Djamal Khelif University of California, Irvine, Irvine, California

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Laura S. Leo University of Notre Dame, Notre Dame, Indiana

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Richard J. Lind Naval Postgraduate School, Monterey, California

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Iossif Lozovatsky University of Notre Dame, Notre Dame, Indiana

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Jesus Planella-Morato University of Notre Dame, Notre Dame, Indiana

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Swagato Mukherjee The Ohio State University, Columbus, Ohio

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Wendell A. Nuss Naval Postgraduate School, Monterey, California

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Jonathan Pozderac The Ohio State University, Columbus, Ohio

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L. Ted Rogers Space and Naval Warfare Systems Center, San Diego, California

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Ivan Savelyev Remote Sensing Division, Naval Research Laboratory, Washington, D.C.

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Dana K. Savidge Skidaway Institute of Oceanography, University of Georgia, Savannah, Georgia

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R. Kipp Shearman Oregon State University, Corvallis, Oregon

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Lian Shen University of Minnesota, Twin Cities, Minneapolis, Minnesota

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Eric Terrill Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California

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A. Marcela Ulate Naval Postgraduate School, Monterey, California

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Qi Wang The Ohio State University, Columbus, Ohio

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R. Travis Wendt Naval Postgraduate School, Monterey, California

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Russell Wiss Naval Surface Warfare Center Dahlgren Division, Dahlgren, Virginia

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Roy K. Woods Naval Postgraduate School, Monterey, California

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Luyao Xu The Ohio State University, Columbus, Ohio

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Ryan T. Yamaguchi Naval Postgraduate School, Monterey, California

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Caglar Yardim The Ohio State University, Columbus, Ohio

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Abstract

The Coupled Air–Sea Processes and Electromagnetic Ducting Research (CASPER) project aims to better quantify atmospheric effects on the propagation of radar and communication signals in the marine environment. Such effects are associated with vertical gradients of temperature and water vapor in the marine atmospheric surface layer (MASL) and in the capping inversion of the marine atmospheric boundary layer (MABL), as well as the horizontal variations of these vertical gradients. CASPER field measurements emphasized simultaneous characterization of electromagnetic (EM) wave propagation, the propagation environment, and the physical processes that gave rise to the measured refractivity conditions. CASPER modeling efforts utilized state-of-the-art large-eddy simulations (LESs) with a dynamically coupled MASL and phase-resolved ocean surface waves. CASPER-East was the first of two planned field campaigns, conducted in October and November 2015 offshore of Duck, North Carolina. This article highlights the scientific motivations and objectives of CASPER and provides an overview of the CASPER-East field campaign. The CASPER-East sampling strategy enabled us to obtain EM wave propagation loss as well as concurrent environmental refractive conditions along the propagation path. This article highlights the initial results from this sampling strategy showing the range-dependent propagation loss, the atmospheric and upper-oceanic variability along the propagation range, and the MASL thermodynamic profiles measured during CASPER-East.

© 2018 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).

CORRESPONDING AUTHOR: Qing Wang, qwang@nps.edu

Abstract

The Coupled Air–Sea Processes and Electromagnetic Ducting Research (CASPER) project aims to better quantify atmospheric effects on the propagation of radar and communication signals in the marine environment. Such effects are associated with vertical gradients of temperature and water vapor in the marine atmospheric surface layer (MASL) and in the capping inversion of the marine atmospheric boundary layer (MABL), as well as the horizontal variations of these vertical gradients. CASPER field measurements emphasized simultaneous characterization of electromagnetic (EM) wave propagation, the propagation environment, and the physical processes that gave rise to the measured refractivity conditions. CASPER modeling efforts utilized state-of-the-art large-eddy simulations (LESs) with a dynamically coupled MASL and phase-resolved ocean surface waves. CASPER-East was the first of two planned field campaigns, conducted in October and November 2015 offshore of Duck, North Carolina. This article highlights the scientific motivations and objectives of CASPER and provides an overview of the CASPER-East field campaign. The CASPER-East sampling strategy enabled us to obtain EM wave propagation loss as well as concurrent environmental refractive conditions along the propagation path. This article highlights the initial results from this sampling strategy showing the range-dependent propagation loss, the atmospheric and upper-oceanic variability along the propagation range, and the MASL thermodynamic profiles measured during CASPER-East.

© 2018 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).

CORRESPONDING AUTHOR: Qing Wang, qwang@nps.edu
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