Accurate L-band measurements of the dielectric constant of seawater

Lang, Roger H.; Utku, C.; Janiczek, J.; Tarkocin, Y.; Vine, David M. Le

doi:10.1109/igarss.2007.4424047

Cited by 9 publications

(10 citation statements)

References 3 publications

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“…As more calibration data became available, the calibration coefficient was recomputed. As a result, measurement data appearing in Lang et al (2008aLang et al ( , 2008b) may differ slightly from the results given in this report. In addition, other seawater measurements have also been added to the data set since the publication of those papers.…”

Section: Seawater Samplescontrasting

confidence: 78%

Accurate measurements of the dielectric constant of seawater at L band

Lang

Zhou

Utku³

et al. 2016

Radio Science

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This paper describes measurements of the dielectric constant of seawater at a frequency of 1.413 GHz, the center of the protected band (i.e., passive use only) used in the measurement of sea surface salinity from space. The objective of the measurements is to accurately determine the complex dielectric constant of seawater as a function of salinity and temperature. A resonant cylindrical microwave cavity in transmission mode has been employed to make the measurements. The measurements are made using standard seawater at salinities of 30, 33, 35, and 38 practical salinity units over a range of temperatures from 0°C to 35°C in 5°C intervals. Repeated measurements have been made at each temperature and salinity. Mean values and standard deviations are then computed. The total error budget indicates that the real and imaginary parts of the dielectric constant have a combined standard uncertainty of about 0.3 over the range of salinities and temperatures considered. The measurements are compared with the dielectric constants obtained from the model functions of Klein and Swift and those of Meissner and Wentz. The biggest differences occur at low and high temperatures.

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Section: Seawater Samplescontrasting

confidence: 78%

Accurate measurements of the dielectric constant of seawater at L band

Lang

Zhou

Utku³

et al. 2016

Radio Science

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“…The Meissner-Wentz model function was developed using inverted satellite data and measurements made by Ho et al Both of these models cover a range of frequencies and have coefficients that are functions of temperature and salinity. Another model function is the George Washington University model function (GW_2008) [5] that is based on laboratory dielectric measurements made at 1.413 GHz using a resonant cavity technique in 2008. This model has an estimated accuracy of approximately 1.0%.…”

Section: Iintroductionmentioning

confidence: 99%

Seawater permittivity model function with new L-band seawater measurements at 33psu

Zhou

Lang

Utku

et al. 2013

2013 IEEE International Geoscience and Remote Sensing Symposium - IGARSS

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Seawater salinity measurements are currently being made at L-band (1.413 Ghz) by NASA's Aquarius instrument (on the Aquarius/SAC-D observatory). The goal of Aquarius mission is to measure the salinity of seawater to an accuracy on the order of 0.2 psu; this requires a model function of seawater permittivity with a high accuracy. Since 2011, the George Washington University (GW) has employed a cavity technique to determine the complex permittivity of seawater at 1.413 GHz. In this paper, a new seawater dielectric model function is introduced including the latest permittivity data for seawater with salinity 33 psu. Finally, the validation of the end-effect, measurement variance and data fitting will be discussed.

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“…The expression used most often at Lband for remote sensing of salinity is that proposed by Klein and Swift [1977]. Although successful, this model is based on a relatively limited set of measurements at 1.4 GHz and the need for an accurate model function at L-band for use by SMOS and Aquarius led to a new wave of measurements [Blanch and Aguasca, 2004;Lang et al, 2008]. The early work used a Debye model for the contribution of the water molecule to provide an expression valid over a range of frequency [e.g.…”

Section: Example: Remote Sensing Of Salinitymentioning

confidence: 99%

“…However, the recent investigations [Blanch and Agusca, 2004;Lang et al, 2008] have focused on measurements at a single frequency (1.4l3 GHz) over a range of salinity and temperature. This work is still in progress [Lang et al, 2009].…”

Section: Example: Remote Sensing Of Salinitymentioning

confidence: 99%