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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 37 records · Page 2
All sourcesNASA NTRSDOE OSTI
NASA NTRS2014

Carbon Monitoring System Flux Estimation and Attribution: Impact of ACOS-GOSAT X(CO2) Sampling on the Inference of Terrestrial Biospheric Sources and Sinks

Using an Observing System Simulation Experiment (OSSE), we investigate the impact of JAXA Greenhouse gases Observing SATellite 'IBUKI' (GOSAT) sampling on the estimation of terrestrial biospheric flux with the NASA Carbon Monitoring System Flux (CMS-Flux) estimation and attribution strategy. The simulated observations in the OSSE use the actual column carbon dioxide (X(CO2)) b2.9 retrieval sensitivity and quality control for the year 2010 processed through the Atmospheric CO2 Observations from Space algorithm. CMS-Flux is a variational inversion system that uses the GEOS-Chem forward and adjoint model forced by a suite of observationally constrained fluxes from ocean, land and anthropogenic models. We investigate the impact of GOSAT sampling on flux estimation in two aspects: 1) random error uncertainty reduction and 2) the global and regional bias in posterior flux resulted from the spatiotemporally biased GOSAT sampling. Based on Monte Carlo calculations, we find that global average flux uncertainty reduction ranges from 25% in September to 60% in July. When aggregated to the 11 land regions designated by the phase 3 of the Atmospheric Tracer Transport Model Intercomparison Project, the annual mean uncertainty reduction ranges from 10% over North American boreal to 38% over South American temperate, which is driven by observational coverage and the magnitude of prior flux uncertainty. The uncertainty reduction over the South American tropical region is 30%, even with sparse observation coverage. We show that this reduction results from the large prior flux uncertainty and the impact of non-local observations. Given the assumed prior error statistics, the degree of freedom for signal is approx.1132 for 1-yr of the 74 055 GOSAT X(CO2) observations, which indicates that GOSAT provides approx.1132 independent pieces of information about surface fluxes. We quantify the impact of GOSAT's spatiotemporally sampling on the posterior flux, and find that a 0.7 gigatons of carbon bias in the global annual posterior flux resulted from the seasonally and diurnally biased sampling when using a diagonal prior flux error covariance.

biased sampling↗
NASA NTRSDate not supplied

Flexible Solar Array Qualification Protocols (FSAP-ACO)

This poster highlights the Game Changing Development Program task, Space Act Agreement between Maxar Technologies and NASA to test 5-junction solar cells on roll out compatible blankets through qualification protocols similar to AIAA Standards S-111/112. A description of the planned work and current status is included.

Jeremiah Mcnatt↗
NASA NTRSDate not supplied

ADEPT Spiderweave Thermal Testing ACO Task

The Adaptable, Deployable, Entry and Placement Technology (ADEPT) mechanically deployable aeroshell uses a multi-layer carbon fabric as the primary drag surface during hypersonic entry. The Spiderweave was produced as part of an SBIR Phase II contract by Bally Ribbon Mills (BRM). The Spiderweave technique addresses challenges of simplified manufacturing and potentially stronger joints between gores with continuous fill fibers connecting each gore in a spiderweave pattern.

Paul Wercinski↗
NASA NTRSDate not supplied

Advanced Alkaline Reversible Cell (AARC) for Production of Hydrogen and Oxygen from ISRU-Generated Water – ACO

NASA needs energy storage for lunar applications where night lasts up to 354 hours. Reversible fuel cell systems are potentially well-suited for long-duration storage but must have high reliability to last the 4-year maintenance cycle. Moving parts (compressors and blowers) are the primary limitation for high reliability fuel cell systems. Further, H2 and O2 have numerous ISRU applications, including propellant, life support, and chemical processes.

Paul Matter↗
NASA NTRS2022

DIP Announcement of Collaborative Opportunity (ACO) for Flight Operators

The DIP Announcement for Collaborative Opportunity provides an opportunity for NASA to directly collaborate with the aviation industry. This information session seeks to clarify questions and provide insight into the DIP sub-project collaboration efforts with industry.

Digital Information Platform↗