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  • Author or Editor: Haflidi Jonsson x
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Qing Wang
,
Denny P. Alappattu
,
Stephanie Billingsley
,
Byron Blomquist
,
Robert J. Burkholder
,
Adam J. Christman
,
Edward D. Creegan
,
Tony de Paolo
,
Daniel P. Eleuterio
,
Harindra Joseph S. Fernando
,
Kyle B. Franklin
,
Andrey A. Grachev
,
Tracy Haack
,
Thomas R. Hanley
,
Christopher M. Hocut
,
Teddy R. Holt
,
Kate Horgan
,
Haflidi H. Jonsson
,
Robert A. Hale
,
John A. Kalogiros
,
Djamal Khelif
,
Laura S. Leo
,
Richard J. Lind
,
Iossif Lozovatsky
,
Jesus Planella-Morato
,
Swagato Mukherjee
,
Wendell A. Nuss
,
Jonathan Pozderac
,
L. Ted Rogers
,
Ivan Savelyev
,
Dana K. Savidge
,
R. Kipp Shearman
,
Lian Shen
,
Eric Terrill
,
A. Marcela Ulate
,
Qi Wang
,
R. Travis Wendt
,
Russell Wiss
,
Roy K. Woods
,
Luyao Xu
,
Ryan T. Yamaguchi
, and
Caglar Yardim

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.

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