Estimating sea spray volume with a laser altimeter

A. Toffoli, A. V. Babanin, M. A. Donelan, Brian K Haus, D. Jeong

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Down-looking laser altimeters are commonly used to measure the sea surface elevation. However, because the laser radiation is attenuated by spray droplets suspended along the transmission path, it is presumed that altimeters may also provide an indirect measure of the sea spray volume. Here, this conjecture is discussed by means of laboratory experiments, which have been conducted in a wind-wave flume. A large number of wind conditions were considered between equivalent 10-m wind speeds of 20 and 60 m s -1 in order to generate different spray volumes above the water surface. The facility was equipped with a laser and side-looking camera system to estimate the spray volume as well as a nearby down-looking laser altimeter. Results confirm that there is a robust degradation of the laser intensity for increasing wind speed and hence the amount of spray droplets above the water surface. A simple regression model to extract spray volume from the average intensity of the laser radiation is presented, demonstrating the promise of laser altimeters for making in situ spray observations. Additional observations will be required to calibrate the altimeters for applications in the open ocean marine environment.

Original languageEnglish (US)
Pages (from-to)1177-1183
Number of pages7
JournalJournal of Atmospheric and Oceanic Technology
Volume28
Issue number9
DOIs
StatePublished - 2011

Fingerprint

Aneroid altimeters
altimeter
spray
laser
Lasers
Laser radiation
droplet
wind velocity
surface water
Water
wind wave
Cameras
sea
open ocean
Degradation
marine environment
sea surface
degradation
Experiments

ASJC Scopus subject areas

  • Atmospheric Science
  • Ocean Engineering

Cite this

Estimating sea spray volume with a laser altimeter. / Toffoli, A.; Babanin, A. V.; Donelan, M. A.; Haus, Brian K; Jeong, D.

In: Journal of Atmospheric and Oceanic Technology, Vol. 28, No. 9, 2011, p. 1177-1183.

Research output: Contribution to journalArticle

Toffoli, A. ; Babanin, A. V. ; Donelan, M. A. ; Haus, Brian K ; Jeong, D. / Estimating sea spray volume with a laser altimeter. In: Journal of Atmospheric and Oceanic Technology. 2011 ; Vol. 28, No. 9. pp. 1177-1183.
@article{99ffd0207eb5417db7307f2397f3b3ca,
title = "Estimating sea spray volume with a laser altimeter",
abstract = "Down-looking laser altimeters are commonly used to measure the sea surface elevation. However, because the laser radiation is attenuated by spray droplets suspended along the transmission path, it is presumed that altimeters may also provide an indirect measure of the sea spray volume. Here, this conjecture is discussed by means of laboratory experiments, which have been conducted in a wind-wave flume. A large number of wind conditions were considered between equivalent 10-m wind speeds of 20 and 60 m s -1 in order to generate different spray volumes above the water surface. The facility was equipped with a laser and side-looking camera system to estimate the spray volume as well as a nearby down-looking laser altimeter. Results confirm that there is a robust degradation of the laser intensity for increasing wind speed and hence the amount of spray droplets above the water surface. A simple regression model to extract spray volume from the average intensity of the laser radiation is presented, demonstrating the promise of laser altimeters for making in situ spray observations. Additional observations will be required to calibrate the altimeters for applications in the open ocean marine environment.",
author = "A. Toffoli and Babanin, {A. V.} and Donelan, {M. A.} and Haus, {Brian K} and D. Jeong",
year = "2011",
doi = "10.1175/2011JTECHO827.1",
language = "English (US)",
volume = "28",
pages = "1177--1183",
journal = "Journal of Atmospheric and Oceanic Technology",
issn = "0739-0572",
publisher = "American Meteorological Society",
number = "9",

}

TY - JOUR

T1 - Estimating sea spray volume with a laser altimeter

AU - Toffoli, A.

AU - Babanin, A. V.

AU - Donelan, M. A.

AU - Haus, Brian K

AU - Jeong, D.

PY - 2011

Y1 - 2011

N2 - Down-looking laser altimeters are commonly used to measure the sea surface elevation. However, because the laser radiation is attenuated by spray droplets suspended along the transmission path, it is presumed that altimeters may also provide an indirect measure of the sea spray volume. Here, this conjecture is discussed by means of laboratory experiments, which have been conducted in a wind-wave flume. A large number of wind conditions were considered between equivalent 10-m wind speeds of 20 and 60 m s -1 in order to generate different spray volumes above the water surface. The facility was equipped with a laser and side-looking camera system to estimate the spray volume as well as a nearby down-looking laser altimeter. Results confirm that there is a robust degradation of the laser intensity for increasing wind speed and hence the amount of spray droplets above the water surface. A simple regression model to extract spray volume from the average intensity of the laser radiation is presented, demonstrating the promise of laser altimeters for making in situ spray observations. Additional observations will be required to calibrate the altimeters for applications in the open ocean marine environment.

AB - Down-looking laser altimeters are commonly used to measure the sea surface elevation. However, because the laser radiation is attenuated by spray droplets suspended along the transmission path, it is presumed that altimeters may also provide an indirect measure of the sea spray volume. Here, this conjecture is discussed by means of laboratory experiments, which have been conducted in a wind-wave flume. A large number of wind conditions were considered between equivalent 10-m wind speeds of 20 and 60 m s -1 in order to generate different spray volumes above the water surface. The facility was equipped with a laser and side-looking camera system to estimate the spray volume as well as a nearby down-looking laser altimeter. Results confirm that there is a robust degradation of the laser intensity for increasing wind speed and hence the amount of spray droplets above the water surface. A simple regression model to extract spray volume from the average intensity of the laser radiation is presented, demonstrating the promise of laser altimeters for making in situ spray observations. Additional observations will be required to calibrate the altimeters for applications in the open ocean marine environment.

UR - http://www.scopus.com/inward/record.url?scp=82655173402&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=82655173402&partnerID=8YFLogxK

U2 - 10.1175/2011JTECHO827.1

DO - 10.1175/2011JTECHO827.1

M3 - Article

AN - SCOPUS:82655173402

VL - 28

SP - 1177

EP - 1183

JO - Journal of Atmospheric and Oceanic Technology

JF - Journal of Atmospheric and Oceanic Technology

SN - 0739-0572

IS - 9

ER -