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Claire L. Parkinson and Gerald F. Herman

)ABSTRACT A four-month simulation of the thermodynamic portion of the Parkinson-Washington sea ice modelwas conducted using atmospheric boundary conditions that were obtained from a pre-computed seasonalsimulation of the Ooddard Laboratory for Atmospheric Sciences' General Circulation Model (GLAS GCM).The sea ice thickness and distribution were predicted for the I January-30 April period based on theOCM-generated fields of solar and infrared radiation, specific humidity and air temperature at the

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. These maps can serve either as end productsfor use in reentry calculations and other aerospace appli-cations or as ht-guess fields for improved maps incor-porating other information.The thickness of layers extending up to the 10-mblevel has been estimated by Nicholas (1970), usingNimbus 2 medium resolution infrared (MRIR) data'The radiation data required a cloud correction and,when used alone, accounted for a 50-percent reductionof variance, at most. Because of differences in the weight

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M. Kästner, K. T. Kriebel, R. Meerkötter, W. Renger, G. H. Ruppersberg, and P. Wendling

-Resolution Infrared Radiation Sounder (HIRS) data have been used together with a bispectraltechnique to derive cloud-top height. Also, the optical depth of some contrails could be estimated. Airbornemeasurements have been performed simultaneously by using the Airborne Lidat Experiment (ALEX), a backscatter lidar. Comparison of satellite data with airborne data showed agreement of the top heights to about 500m and of the optical depths to about 30%. These uncertainties are within the limits obtained from error

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tracks (for SIRS B).The purpose of this study is, therefore, to find method ofestimating the values at any location between tracks, thusincreasing the horizontal resolution of the radiation datafor the particular case of Nimbus 3 infrared interferometerspectrometer (IRIS) observations. The result is a moredetailed estimate of the horizontal temperature andheight gradients at each pressure level from which windscan be derived.The IRIS on Nimbus 3 viewed only in the nadir direc-tion, resulting in

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Ming-Dah Chou

to thebehavior in the wings of absorption lines, Chou andArking (1981) developed a fast and accurate methodfor computing the absorption of solar~radiation bywater vapor between the top of the atmosphere andany pressure level in the atmosphere. Since the satellite-measured radiation also is related to the transmittance between the top of the atmosphere andpressure levels in the atmosphere, the same methodis applied in this study to the computation of transmittance in infrared water vapor channels

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Will McCarty, Ronald M. Errico, and Ronald Gelaro

CloudSat Data Processing Center for the DJF seasons between 1 December 2006 and 28 February 2009 are considered in this study. b. HIRS cloud climatology The HIRS cloud climatology ( Wylie et al. 1994 ; Wylie and Menzel 1999 ) is also used for verification in this study. For this product, the CO 2 slicing method ( Smith and Platt 1978 ; Menzel et al. 1983 ) for solving cloud-top pressure (CTP) has been applied to measurements from the High Resolution Infrared Radiation Sounder (HIRS) measurements

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R. F. Cahalan, D. A. Short, and G. R. North

26 MONTHLY WEATHER REVIEW VOLUME 110Cloud Fluctuation Statistics R. F. CAHALAN, D. A. SHORT AND (~. R. NORTHLaboratory for .4trnospherie Sciences, NAS, q/Goddard Space Flight Center, Greenbelt, ldD 20771 (Manuscript received 16 April 1981, in final form 4 December 1981)ABSTRACT A space-time statistical analysis of total outgoing infrared radiation (derived from the I0.5-12.5 t~mwindow measurements of the

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UDC 661.624. :651.M)7.382.2(100)"323"Stratospheric Temperature Variations in Autumn-Northern and Southern Hemispheres ComparedSIGMUND FRITZ-National Environmental Satellite Service, NOAA, Suitland, Md.RAYMOND M. MclNTURFF-National Weather Service, NOAA, Hillcrest Heights, Md.ABSTRACT-The Satellite Infrared Spectrometer onboard pockets of warm air remain in spite of the seasonal coolingNimbus 3 has a 5 cm-1 spectral interval centered at due to decreasing solar radiation over each hemisphere.669

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geopotential height profilesfrom satellite radiation measurements, particularly those obtained by the Sate1lit)e Infra-Red Spectrometer (SIRS)aboard the Nimbus 3 satellite launched Apr. 14, 1969. Regression equations relating temperature and geopotentialheight to spectral radiance observations are derived. A method accounting for the influence of clouds, mountains, andhot terrain on the solutions is described. Results obtained from Nimbus 3 radiance data are presented.The procedure described herein has

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B. G. Hunt

restricted to backscattering the incoming solar radiation only, thusomitting the potentially important effect of the debris on the outgoing infrared radiation. Results presentedshow that the debris was diffused in a meaningful manner, and that the early debris distribution obtainedwas affected by whether or not coupling with the solar radiation was permitted. The debris produced perturbations in the wind fields of such a nature that, in general, the mean zonal windwas slightly reduced, while some

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