Models and Characteristics of. Freezing Rain and Freezing Drizzle for Aircraft Icing. LEWICE NASA software for computing ice accretions on aircraft. Irish doctor to embark on undersea NASA mission. An Irish doctor is one of six people who have been selected to take part in a NASA mission later this month. Dr Marc . You have six people effectively crammed down into this tiny little space. You have a small galley where food can be prepared. Cloud observations from MODIS . First, the “cloud mask”, with a wide range of situation- dependent tests using measurements in many spectral bands, determines the likelihood that a pixel contains some cloud. Next, cloud- top pressure is estimated, first using a technique based on absorption by carbon dioxide. An Irish doctor is one of six people who have been selected to take part in a NASA mission later this month. Luke, 2011: Cloud radar Doppler spectra in drizzling stratiform clouds: 2. Observations and microphysical modeling of drizzle. NASA Official : Gavin A. Help NASA SBIR/STTR Program Support For questions. National Aeronautics and Space Adm inistrat on SLD Research at NASA. National Aeronautics and Space Administration . The so- called CO2 slicing technique fails if the cloud is too low in the atmosphere, in which case MODIS (like ISCCP) uses an estimate based on infrared window emission in a channel centered at about 1. Cloud thermodynamic phase is determined from further spectral tests. Finally, optical thickness and particle size are retrieved simultaneously (Nakajima and King, 1. Liquid or ice water path is estimated from the product of particle size and optical thickness (following Stephens, 1. Like all current global passive remote sensing retrievals, MODIS uses forward models that assume plane- parallel, homogeneous clouds within each pixel. MODIS differs from other datasets (notably ISCCP and MISR) because it attempts to identify and exclude partly- cloud pixels before determining thermodynamic phase, particle size, and optical thickness. In the global, long- term mean “clear- sky restoral” removes about a quarter of all pixels identified by the cloud mask, so that the retrieval cloud fraction (about 5. Clouds with low optical thickness (less than ~3) are much less frequent in MODIS observations than in comparable data sets. For more information see Pincus et al. MODIS estimates particle size at three independent wavelengths with increasing amounts of absorption by condensed water (1. This may be due to small- scale variability in cloud properties (Zhang et al., 2. Nakajima et al., 2. Aggregated MODIS data is available at daily, eight- day, and monthly intervals on a 1- degree equal angle grid. Averages are reported for all clouds and for the subsets of ice and liquid clouds. Linear and logarithmic averages of optical depth are reported (the exponentiated logarithmic average gives roughly the correct mean albedo at cloud- top when coupled with the same surface spectral properties used in the MODIS algorithm). Many joint histograms are provided (optical thickness/cloud top pressure, optical thickness/particle size, etc.)A MODIS “instrument simulator” is available as part of the COSP package (Bodas- Salcedo et al., 2. Output from this simulator can be directly compared to a subset of the monthly aggregated data described in Pincus et al. MODIS cloud fraction estimates from the cloud mask are comparable with ISCCP, MISR, and PATMOS- X, as are optical thickness comparisons that account for clear- sky restoral by MODIS (this can be accomplished in practice by excluding the thinnest clouds from the comparison). NASA S-Band Dual -Polarimetric Radar. The HID product is generated using software provided by Colorado State University and is based on the. The classifications are: UC: Unclassified: DZ: Drizzle: RN: Rain: CR: Ice. News and features about NASA research, aimed at the general public. Includes sections on astronomy, space science, beyond rocketry, living in space, earth science, biological and physical sciences. Zusatzanleitung Drizzle / LPI. Zusammen mit Drizzle bietet die Software folgende neue M. Entwickelt von der NASA f The web site of the Cloud Absorption Radiometer (CAR) - Code 613, a project of NASA Laboratory for Atmospheres at NASA Goddard Space Flight Center located in Greenbelt, MD, USA. Particle size estimates are roughly comparable with PATMOS- X, though this too is complicated by MODIS clear- sky restoral. MODIS estimates of condensed water path are not comparable to microwave estimates except in carefully controlled circumstances (Seethala and Horv. FREEZING RAIN AND DRIZZLE FOR SUPER COOLED LARGE DROPLET ICING RESEARCH FLIGHT TEST PROJECT. Community Software MS-DOS APK Software Sites Tucows Software Library Vintage Software Vectrex.
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