A Steerable Dual-Channel Microwave Radiometer for Measurement of Water Vapor and Liquid in the Troposphere

Hogg, David C.; Guiraud, F. O.; Snider, J. B.; Decker, M. T.; Westwater, Ed R.

doi:10.1175/1520-0450(1983)022<0789:asdcmr>2.0.co;2

Cited by 186 publications

(99 citation statements)

References 13 publications

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“…Fig. 7 (Hogg et al ,1983) shows the azimuthal dependence of total liquid water, at an elevation angle of 12.5°, during an influx of moist air; similar behavior has been observed in the total column water vapor. Such systems could be used to monitor continuously total liquid and vapor overhead for comparison with satellite cloud reflectivity.…”

Section: Remote Sensing Of Cloud Propertiessupporting

confidence: 63%

“…Through multiwavelength observations, it may be possible to analyze the dependence of the reflectivity on the liquid water content (DeVault and Katsaros, 1983). A dualchannel microwave radiometer (Hogg et al, 1983) would also help make this link. In addition, analysis of simultaneous views from different angles, obtainable from two geostationary satellites or from a combination of geostationary and polar orbiter, would characterize significant finite cloud effects on the observed radiances (Naber and Weinman, 1984).…”

Section: A Statistical Characterizationsmentioning

confidence: 99%

“…Ground-based scanning dual-channel microwave radiometers that measure accurately path-integrated liquid water and water vapor now exist (Hogg et al, 1983) and have been successfully used in the marine environment (Snider, private communication). Fig.…”

Section: Remote Sensing Of Cloud Propertiesmentioning

confidence: 99%

See 2 more Smart Citations

Outlook for Research on Subtropical Marine Stratification Clouds

Randall¹,

Coakley²,

Lenschow³

et al. 1984

Bull. Amer. Meteor. Soc.

257

170

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Section: Remote Sensing Of Cloud Propertiessupporting

confidence: 63%

Section: A Statistical Characterizationsmentioning

confidence: 99%

See 1 more Smart Citation

Outlook for Research on Subtropical Marine Stratification Clouds

Randall¹,

Coakley²,

Lenschow³

et al. 1984

Bull. Amer. Meteor. Soc.

257

170

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“…The observation data by the ground-based microwave radiometer profiler (MWR) has been used to retrieve vertically integrated water vapor (precipitable water vapor: PWV) and liquid water (liquid water path: LWP) (e.g., Hogg et al 1983a;Wei et al 1989;Cadeddu et al 2013), and vertical profiles of atmospheric temperature, water vapor density, and liquid water content (LWC) at time intervals within a few minutes (e.g., Ware et al 2003Ware et al , 2013Campos et al 2014;Serke et al 2014;Gultepe et al 2015). For the retrieval of vertical thermodynamic profiles, various inversion methods have been proposed such as statistical inversion methods, multivariate regressions, neural networks (NN; e.g., Hogg et al 1983b;Solheim et al 1998;Cadeddu et al 2009), and variational techniques (e.g., Löhnert et al 2004;Hewison et al 2007;Cimini et al 2006Cimini et al , 2010Cimini et al , 2011Cimini et al , 2015Ishimoto 2015).…”

Section: Introductionmentioning

confidence: 99%

Ground-Based Microwave Radiometer Variational Analysis during No-Rain and Rain Conditions

Araki¹,

Murakami²,

Ishimoto³

et al. 2015

SOLA

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Ground-based microwave radiometer (MWR) has been used for high-frequency retrievals of thermodynamic environments. However, raindrops on the radome of MWR and in the air cause errors in retrievals during precipitation events. Although a recent study has noted that off-zenith observations with neural networks (NN) reduce the retrieval errors, the effect of off-zenith observations with one-dimensional variational (1DVAR) technique, which is known to be more accurate than other methods, has not been studied. We developed a new 1DVAR technique that considers the effect of cloud liquid water. We statistically investigated the accuracy of vertical profiles of atmospheric temperature and water vapor retrieved by NN and 1DVAR techniques by using zenith and off-zenith observation at 15° elevation angle under no-rain and rainy conditions and compared them with results of radiosonde observations. The results showed that the 1DVAR technique outperforms NN and numerical model simulation in the estimation of thermodynamic profiles under no-rain conditions. The results also indicated that the error in retrieved profiles in the low-level troposphere can be reduced by the 1DVAR technique by using off-zenith observations even under rainy conditions with rainfall rate less than 1.0 mm h −1 , especially when the environment cannot be accurately reproduced by a numerical model.(Citation: Araki, K., M. Murakami, H. Ishimoto, and T. Tajiri, 2015: Ground-based microwave radiometer variational analysis during no-rain and rain conditions. SOLA, 11, 108−112,

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“…Recently, according to an advance in microwave techniques, PWC can be measured from an observation of microwave emission of atmospheric water vapor. The microwave technique has the advantages of continuous measurements, easy operation and portability compared with the traditional way (Westwater,1978;Guiraud, et al, 1979;Elgered,1982;Hogg et al, 1983;Rocken et al, 1991).…”

Section: Introductionmentioning

confidence: 99%

A Method to Retrieve Precipitable Water Content Using a Microwave Spectro-Radiometer

Takamura

1996

Journal of the Meteorological Society of Japan

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A new method, utilizing a 22.235 GHz-water vapor emission line, to retrieve precipitable water content (PWC) is proposed. To obtain PWC, the method includes estimating the portion of the water vapor contribution to the brightness temperature, integrated over the microwave ) range. It is appropriate to use the K-band range in order to retrieve PWC because the emission (or absorption) in this frequency range is weak and the line strength is little dependent on atmospheric temperature and pressure.By using several atmospheric models with typical cloud types, the following approximate relation to retrieve PWC is introduced:where a=0.2135+0.0021, b=-0.0420+0.0251, Tb.obs(f) is a brightness temperature observed at a frequency of f GHz, and f1 and f2 are lower and upper boundary frequencies for integration, which are 18 and 26GHz, respectively, and df=f2-f1.dTb is a correction factor for the term correcting cloud and water vapor continuum emission. It is best for dTb to be set at 0.2K empirically.By using actual radiosonde data along with clouds introduced depending on atmospheric conditions, an error is determined from the above approximate method for retrieval of PWC. The error for PWC is less than 5% under the average atmospheric condition (PWC>1g/cm2 and liquid water path (LWP)<0.1g/m2), and is about 6% for rather cool atmospheric conditions (PWC<1g/cm2 and LWP<0.01g/m2).

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A Steerable Dual-Channel Microwave Radiometer for Measurement of Water Vapor and Liquid in the Troposphere

Cited by 186 publications

References 13 publications

Outlook for Research on Subtropical Marine Stratification Clouds

Outlook for Research on Subtropical Marine Stratification Clouds

Ground-Based Microwave Radiometer Variational Analysis during No-Rain and Rain Conditions

A Method to Retrieve Precipitable Water Content Using a Microwave Spectro-Radiometer

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