Retrieval of Water Vapor Profiles from Microwave Radiometric Measurements near 90 and 183 GHz

Wang, J.R.; Wilheit, T. T.; Chang, Li-Yen; Krupp, Brian

doi:10.1175/1520-0450(1990)029<1005:rowvpf>2.0.co;2

Cited by 29 publications

(13 citation statements)

References 16 publications

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“…AMSU‐B; Saunders et al , 1995; Table 1) with channels at 183.31 ± 1.0, 183.31 ± 3.0 and 183.31 ± 7.0 GHz, which were shown to be a more favourable distribution of the weighting functions for a retrieval at relatively high altitudes (∼12 km; e.g. Wang and Chang, 1990).…”

Section: Information Content Of the 18331 Ghz Bandmentioning

confidence: 99%

“…Cabrera‐Mercadier and Staelin, 1995; Karbou et al , 2005), iterative schemes (e.g. Wang et al , 1983; Wang and Chang, 1990; Wilheit and Al‐Khalaf, 1994; Blankenship et al , 2000; Liu and Weng, 2005) and multivariate regression methods (e.g. Rosenkranz et al , 1982; Kakar and Lambrigsten, 1984).…”

Section: Information Content Of the 18331 Ghz Bandmentioning

confidence: 99%

“…Two types of training database are generally used for the design of a retrieval scheme: the atmospheric profiles are either extracted from quality‐controlled radiosoundings (see Wang and Chang, 1990; Cabrera‐Mercadier and Staelin, 1995; among others) or from analyses or reanalyses (NCEP‐NCAR or ECMWF models, e.g. Eymard et al , 1993; Shi, 2001; Zhang et al , 2008; Aires et al , 2012, this issue).…”

Section: Datasetsmentioning

confidence: 99%

See 2 more Smart Citations

Expected improvements in the atmospheric humidity profile retrieval using the Megha‐Tropiques microwave payload

Brogniez

Kirstetter

Eymard

2011

Quart J Royal Meteoro Soc

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The microwave payload of the Megha-Tropiques mission is explored to quantify the expected improvements in the retrieval of relative humidity profiles. Estimations of the profiles are performed using a generalized additive model that uses cubic smoothing splines to address the nonlinear dependencies between the brightness temperatures (T B ) in the 183.31 GHz band and the relative humidity of specified tropospheric layers. Under clear-sky and oceanic situations, the six-channel configuration of the SAPHIR radiometer clearly improves the retrieval and reduces by a factor of two the variance of the residuals with respect to the current spaceborne humidity sounders that have three channels in this band (AMSU-B, MHS). Additional information from the MADRAS radiometer (at 23.8 and 157 GHz) further improves the restitution with correlation coefficient higher than 0.89 throughout the troposphere.

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Section: Information Content Of the 18331 Ghz Bandmentioning

confidence: 99%

Section: Information Content Of the 18331 Ghz Bandmentioning

confidence: 99%

Section: Datasetsmentioning

confidence: 99%

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Expected improvements in the atmospheric humidity profile retrieval using the Megha‐Tropiques microwave payload

Brogniez

Kirstetter

Eymard

2011

Quart J Royal Meteoro Soc

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“…SSM/T2 [Falcone et al, 1992] is borne on F 11 and later satellites. It is primarily designed for the retrieval of atmospheric water vapor profiles [AI- Khalaf et al, 1994;Wang and Chang, 1990; Wilheit, 1990], with channels at 91.655, 150, 183.31___7, 183.31___3, and 183.31___1 GHz (hereafter referred to as 92, 150. 183___7, 183+_3, and 183+_1 GHz, respectively).…”

Section: Data Sourcesmentioning

confidence: 99%

Large‐scale cloud features during January 1993 in the North Atlantic Ocean as determined from SSM/I and SSM/T2 observations

Liu¹

1996

J. Geophys. Res.

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Satellite microwave (special sensor microwave/imager (SSM/I) and special sensor microwave water vapor sounder (SSM/T2)) data are used to study the large‐scale cloud and precipitation features during January 1993 in the North Atlantic (30°–80°N, 80°W–30°E). Modification and validation of existing retrieval algorithms are made so that these algorithms are more suitable for high‐latitude situations. A new algorithm for atmospheric ice/snow retrieval using SSM/T2 data is developed. Although no direct validation has been conducted, the retrieved large‐scale ice water path distribution compares well with a snowfall frequency climatology derived from shipboard present‐weather reports. Monthly mean distributions of water vapor path, liquid water path, ice water path, and rainfall rate are investigated in relation to sea surface temperature. The results show that the magnitude of precipitable water is highly correlated with the absolute value of sea surface temperature. The largest values of liquid water path and rainfall are found over the Gulf Stream. Snowfall is greatest off the east coast of Canada, which is thought to correspond to the shallow convection associated with cold air outbreaks from the continent. Fresh water flux (precipitation minus evaporation) retrieved from satellite data show that rainfall and evaporation are almost in balance in the middle of North Atlantic (40°–60°N, 50°–10°W), while rainfall is larger than evaporation north of this region, and evaporation is larger than rainfall to the south. Also, high values of fresh water fluxes are found along the Gulf Stream. Strong correlation was found between northward water vapor transport across 60°N parallel and the cloud and precipitation properties in the Greenland Sea, implying that horizontal water vapor transport from lower latitudes plays an important role in the cloud development in this region.

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“…It is a cross-track instrument with double sideband modes, whose radiometric main features are recalled in Table 1. Early studies on the 183.31-GHz absorption band for RH profiling (Schaerer and Wilheit 1979;Wang and Chang 1990) have led to designing three-channel sounders [e.g., the Advanced Microwave Sounding Unit-B (AMSU-B); Saunders et al 1995], and the current six-channel configuration improves the retrievals of RH (Brogniez et al 2013;Gohil et al 2013). In each scan line, the antenna collects 182 pixels, the so-called L1A data, which are resampled to obtain 130 contiguous pixels, the so-called L1A2 data.…”

Section: Introductionmentioning

confidence: 99%

Validation of Upper-Tropospheric Humidity from SAPHIR on board Megha-Tropiques Using Tropical Soundings

Brogniez

Clain

Roca

2015

Journal of Applied Meteorology and Climatology

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This paper describes the upper-tropospheric humidity (UTH) product derived from brightness temperature measurements of the Sondeur Atmosphérique du Profil d'Humidité Intertropicale par Radiométrie (SAPHIR) radiometer on board the Megha-Tropiques satellite. Under nonscattering conditions, the observations from three channels of SAPHIR-located at 60.2, 61.1, and 62.8 GHz, respectively, around the 183.31-GHz strong water vapor absorption band-are interpreted into three different UTHs following a wellestablished method and thus describing the humidity content of the upper to midtroposphere. The evaluation of the UTHs is performed using reference UTHs defined from relative humidity (RH) profiles from radiosoundings of two field campaigns: the Cooperative Indian Ocean Experiment on Intraseasonal Variability in the Year 2011/Dynamics of the Madden-Julian Oscillation/Atmospheric Radiation Measurement Program Madden-Julian Oscillation Investigation Experiment (CINDY/DYNAMO/AMIE) and a Megha-Tropiques dedicated campaign in Ouagadougou, Burkina Faso, during the summer of 2012. A budget of the various uncertainties associated with each component of the evaluation method (such as the radiometric sensitivity and the radiative transfer computations) was created to achieve a more robust comparison between the two UTH estimates. The comparison between the reference UTHs and the SAPHIR UTHs reveals small global biases of lower than 2% RH on average, with correlation coefficients between 0.86 and 0.89. Taking into account the individual uncertainties gives root-mean-square errors of regressions that range between 0.92% and 4.71%. These three UTHs provide a vertical distribution of the RH that is suitable for studying various temporal and spatial scales of the tropical variability. The signature of a mesoscale convective system on its environment is briefly presented to illustrate the capability of this new dataset.Corresponding author address: Hélène Brogniez, LATMOS, 11 boulevard d'Alembert,

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Retrieval of Water Vapor Profiles from Microwave Radiometric Measurements near 90 and 183 GHz

Cited by 29 publications

References 16 publications

Expected improvements in the atmospheric humidity profile retrieval using the Megha‐Tropiques microwave payload

Expected improvements in the atmospheric humidity profile retrieval using the Megha‐Tropiques microwave payload

Large‐scale cloud features during January 1993 in the North Atlantic Ocean as determined from SSM/I and SSM/T2 observations

Validation of Upper-Tropospheric Humidity from SAPHIR on board Megha-Tropiques Using Tropical Soundings

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