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  • 1
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    Determination of volcanic dust deposition from El Chichon using ground and satellite data (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Major volcanic eruptions of El Chichon on 28 March 1982, 3 April 1982 and 4 April 1982 produced heavy tephra falls in surrounding areas. Data from the NOAA-6 and NOAA-7 satellites were used to determine the extent of the tephra falls. The satellite data showed a larger area of tephra deposition than was reported from conventional ground measurements.
    Keywords: GEOPHYSICS
    Type: International Journal of Remote Sensing (ISSN 0143-1161); 6; 619-627
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Application of AVHRR vegetation index to study atmosphere-biosphere exchange of CO2 (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The Advanced Very High Resolution Radiometer (AVHRR) satellite-borne sensor is presently used, together with field data, to determine the geographic distributions of the seasonal exchange of CO2 between the earth's atmosphere and the terrestrial biota. The exchange functions thus obtained are validated in virtue of the ability to reproduce the observed annual cycle of atmospheric CO2 in a three-dimensional tracer transport model. The AVHRR is carried by the TIROS-N series of polar-orbiting satellites.
    Keywords: GEOPHYSICS
    Type: IAF PAPER 85-11
    Format: text
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  • 3
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    The relationship of global green leaf biomass to atmospheric CO2 concentrations (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: Advanced very high resolution radiometer data from NOAA's polar orbiting meteorological satellite have been obtained globally for a 21 month period, processed to produce a green leaf biomass spectral vegetative index for the entire terrestrial surface by month, zonally aggregated by latitude, and compared to atmospheric CO2 concentrations from observing stations. A strong inverse association was found between the monthly Pt. Barrow CO2 concentrations and the vegetation index measurements from 50 deg N to 80 deg N, between the monthly Mauna Loa CO2 concentrations and the vegetation index measurements from 10 deg N to 30 deg N, 10 deg N to 80 deg N, and the global total, and between the globally averaged CO2 concentrations and the globally averaged vegetation index. No relationships between atmospheric CO2 concentrations and the vegetative index measurements from any latitude zone or combinations of zones were found for the South Pole station.
    Keywords: ENVIRONMENT POLLUTION
    Type: NASA. Ames Research Center, First Symposium on Biospheric Research; p 12
    Format: text
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  • 4
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    Application of AVHRR vegetation index to study atmosphere-biosphere exchange of CO2: Results from a 3-D tracer transport model (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: The 'normalized difference vegetation indices' (NVI) derived from AVHRR radiances are combined with field data of soil respiration and a global map of net primary productivity to prescribe, for the globe, the seasonal exchange of CO2 between the atmosphere and the terrestrial biosphere. The monthly fluxes of CO2 thus obtained are used as inputs to a 3-D tracer transport model which uses winds generated by a 3-D atmospheric general circulation model to advect CO2 as an inert constituent. Analysis of the 3-D model results shows reasonable agreement between the simulated and observed annual cycles of atmospheric CO2 at the locations of the remote monitoring stations. The application is shown of atmospheric CO2 distributions to calibrate the NVI in terms of carbon fluxes. The approach suggests that the NVI may be used to provide quantitative information about long term and global scale variations of photosynthetic activity and of atmospheric CO2 concentrations provided that variations in the atmospheric circulation and in atmospheric composition are known.
    Keywords: ENVIRONMENT POLLUTION
    Type: NASA. Ames Research Center, First Symposium on Biospheric Research; p 11
    Format: text
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  • 5
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    Application of Advanced Very High Resolution Radiometer vegetation index to study atmosphere-biosphere exchange of CO2 (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Normalized difference vegetation indices derived from radiances measured by the Advanced Very High Resolution Radiometer were used to prescribe the phasing of terrestrial photosynthesis. The satellite data were combined with field data on soil respiration and a global map of net primary productivity to obtain the seasonal exchange of CO2 between the atmosphere and the terrestrial biosphere. The monthly fluxes of CO2 thus obtained were employed as source/sink functions in a global three-dimensional atmospheric tracer transport model to simulate the annual oscillations of CO2 in the atmosphere. The results demonstrate that satellite data of high spatial and temporal resolution can be used to provide quantitative information about seasonal and longer-term variations of photosynthetic activity on a global scale.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 92; 2999-301
    Format: text
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