PPT-Land Surface Microwave Emissivity: Uncertainties, Dynamics

Yudong Tian Christa PetersLidard Ken Harrison Sujay Kumar and Sarah Ringerud   httplisgsfcnasagovPMM Sponsored by NASA PMM Program PI C PetersLidard 2 Outline 1 Why does land surface microwave emissivity matter . cisnagasakiuacjp Commission VIII8 KEY WORDS MODIS Land surface temperatureemissivity NDVINDWI ABSTRACT For the Land surface estimation from the satellite on the basis of the splitwindow method the land surface emissivity have to be the known value To Neil Humpage, University of Leicester. The EO-Convoy Land study team. Introduction. ESA are undertaking three studies investigating possible . synergistic . satellite missions flying in formation with the operational . By: Emily Teske. Meteorology. Department of Marine and Environmental Systems. Florida Institute of Technology. Objective. Measure the Emissivity of Wet, Damp, and Dry sand. Compare these measured . emissivities. emissivities. with satellite-based estimates. C. Prigent and F. Aires (. Estellus. + . Observatoire. de Paris . ). P. Liang and J.-L. . Moncet. (AER). T. . Tian. (NASA). S. . Boukabara. (NOAA). Jean-Luc . Moncet. P. Liang, J. Galantowicz, G. Uymin, A. Lipton, C. Prigent*, B. Hornbuckle**. Atmospheric and Environmental Research, . Inc.. *LERMA. **Iowa State University. First version of global monthly. Land . Surface Temperature and . Emissivity (LST&E) Products.  . Glynn Hulley, . Simon . Hook. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA. (c) . 2014 . California Institute of Technology. Government sponsorship acknowledged. Olaf Stiller, Axel Seifert . and. Martin Köhler. Deutscher Wetterdienst, Offenbach, Germany. An NWP perspective:. scientific understanding .   . capability to model . .. Uncertainties in . Jean-Luc . Moncet. P. Liang, J. Galantowicz, G. Uymin, A. Lipton, C. Prigent*, B. Hornbuckle**. Atmospheric and Environmental Research, . Inc.. *LERMA. **Iowa State University. First version of global monthly. radiometry. Peter Minnett. 1. , Gary Corlett. 2. & . ISSI Team. 1. Rosenstiel School of Marine and Atmospheric Science. University of Miami. 2. University of Leicester, Department of Physics and Astronomy. Thermal Infrared . from IASI. AGU Fall Meeting, 14. th. -18. th. December, San Francisco, USA.. Email: diane.knappett@stfc.ac.uk. Diane Knappett, Richard . Siddans. , Brian . Kerridge. ,. Jane . Hurley and Alison Waterfall. 1. Microwave Remote Sensing. With a Focus on Passive millimeter wavelength -MW. Sid Ahmed . Boukabara. Principal Scientist, NESDIS Center for Satellite Applications and Research (STAR). 2. Contents. Specific Focus on Precipitating Cases.  . Alain . Royer, . Alexandre. . Roy, Benoit . Montpetit. and . Al. exandre. . Langlois. Cartel. , . Université. de . Sherbrooke. With the . collaboration . of. Ghislain. Picard, LGGE, . Grenoble (DMRT). Visible. Wavelength . . . Infrared. Wave number n = 1/. . Microwave. Frequency . =1/t. , . in GHz (since . Hz . is small). Microwave Remote Sensing. Note. :. Different units used for different . Seth Abramczyk. November 19. th. , 2021. Abstract. Accurate knowledge of the optical properties of spacecraft components, especially external components, is critical for proper spacecraft thermal design. The effective emissivity of isogrid (an array of equilateral triangular cavities) is not well understood, which poses a challenge for spacecraft thermal management. In this thesis the effective emissivity of isogrid with a prescribed base temperature and nonisothermal walls is examined. The temperature profile of the cavity’s walls and the overall effective emissivity of the cavity are found using Thermal Desktop with Monte Carlo ray tracing. The effective emissivity’s dependence on the wall height, wall thickness, wall resistance, and surface emissivity are examined. The existence of a critical wall height, and the contributing factors to this critical height, are discussed. Comparisons between isogrid and cavities with different base geometries are made. A variable emissivity isogrid spacecraft radiator concept employing the cavity effect is proposed, and mechanisms for achieving this are discussed..