Algorithm science to operations for the National Polar-orbiting Operational Environmental Satellite System (NPOESS) visible/infrared imager/radiometer suite (VIIRS)
The VIIRS sensor provides measurements for 22 environmental data records (EDRs) addressing the atmosphere, ocean surface temperature, ocean color, land parameters, aerosols, imaging for clouds and ice, and more. That is, the VIIRS collects visible and infrared radiometric data of the Earth's atmosphere, ocean, and land surfaces. Data types include atmospheric, clouds, Earth radiation budget, land/water and sea surface temperature, ocean color, and low light imagery. This wide scope of measurements calls for the preparation of a multiplicity of algorithm theoretical basis documents (ATBDs), and, additionally, for intermediate products such as cloud mask, et al. Furthermore, the VIIRS interacts with three or more other sensors. This paper addresses selected and crucial elements of the process being used to convert and test an immense volume of a maturing and changing science code to the initial operational source code in preparation for launch of NPP. The integrity of the original science code is maintained and enhanced via baseline comparisons when re-hosted, in addition to multiple planned code performance reviews.
Algorithm science to operations for the National Polar-orbiting Operational Environmental Satellite System (NPOESS) ozone mapping and profiler suite (OMPS)
The NPOESS Ozone Mapping and Profiler Suite (OMPS) will collect data to permit the retrieval of the vertical and horizontal distribution of ozone in the Earth's atmosphere. Algorithm development efforts in connection with these measurements include the preparation of Algorithm Theoretical Basis Documents (ATBDs), Operational Algorithm Documents (OADs), and science grade code with associated test sets and documentation. These items are provided to the Interface Data Processing Segment (IDPS) for conversion and integration into the operational system. This paper addresses elements of the process being used to convert, test, and maintain the maturing and changing science grade code to the initial operational source code for the OMPS. The operational OMPS SDRs and EDRs will be generated by the IDPS, that is, ozone output items will include the sensor and environmental data records, associated metadata and product validation; e.g. ancillary data, calibration information and quality flags.
Numerical and experimental investigation on air distributor design of fluidized bed reactor of sawdust pyrolysis
Abstract An improved biomass conversion in a lab-scale fluidized bed reactor (FBR) is achieved by optimizing the air distributor orifice size and number. Two approaches for introducing air were numerically and experimentally examined. These included perforated plate and downward orifice sparger. 3 mm and 5 mm orifice diameters, and 7, 9 and 13 holes were simulated at flow velocities of 2, 4, 6, and 8 times the minimum fluidization velocity, Umf. The simulation results revealed that increasing the orifice number has a positive effect on gas holdup, particularly for the perforated plate, which showed a uniform distribution of bubbles. The sparger configuration produced larger bubbles sizes, which could lead to better recirculation of solid flux, while stagnant particle zones were observed at the lower section of both distributors. A pyrolysis unit is also inserted at the top of freeboard of the FBR. For perforated plate with 6Umf, the pyrolysis process achieved thermal and cold gas efficiencies of 82.91% and 52.03%, respectively, while combustible gases with 41.6%mol CO, 8.7%mol CH 4 and 2.17%mol HC, were obtained. For sparger pipe and 6U mf _sp, 35.33 ppm NOx and 111 ppm SO 2 were measured in flue gas from combustion process at bed region.