NASA Scientific and Technical Aerospace Reports

the scientific questions of the roles of fluvial and, especially, glacial erosion in the evolution of relief in mountainous regions
using available digital elevation models (DEMs) for the Southern Alps of New Zealand (available at both 25m and 50m pixel
sizes), and USGS 10m and 30m DEMs within the Western US. As emphasized in the original proposal, we chose the emphasis
on the role of glacial modification of topographic relief because there has been little quantitative investigation of glacial
erosion processes at landscape scale. This is particularly surprising considering the dramatic sculpting of most mid- and
high-latitude mountain ranges, the prodigious quantities of glacially-derived sediment in terrestrial and marine basins, and the
current cross-disciplinary interest in the role of denudational processes in orogenesis and the evolution of topography in
general. Moreover, the evolution of glaciated landscapes is not only a fundamental problem in geomorphology in its own right,
but also is at the heart of the debate over Late Cenozoic linkages between climate and tectonics.
Derived from text
Glaciers; Erosion; Topography; Tectonics; Geomorphology; Geological Surveys
20040070915 Boston Univ., Boston, MA, USA
Deriving Albedo from Coupled MERIS and MODIS Surface Products
Gao, Feng; Schaaf, Crystal; Jin, Yu-Fang; Lucht, Wolfgang; Strahler, Alan; [2004]; 17 pp.; In English; MERIS Users
Workshop, 10-14 Nov. 2004, Frascati, Italy; Original contains black and white illustrations
Contract(s)/Grant(s): NAG5-11263; No Copyright; Avail: CASI; A03, Hardcopy
MERIS Level 2 surface reflectance products are now available to the scientific community. This paper demonstrates the
production of MERIS-derived surface albedo and Nadir Bidirectional Reflectance Distribution Function (BRDF) adjusted
reflectances by coupling the MERIS data with MODIS BRDF products. Initial efforts rely on the specification of surface
anisotropy as provided by the global MODIS BRDF product for a first guess of the shape of the BRDF and then make use
all of the coincidently available, partially atmospherically corrected, cloud cleared, MERIS observations to generate
MERIS-derived BRDF and surface albedo quantities for each location. Comparisons between MODIS (aerosol-corrected) and
MERIS (not-yet aerosol-corrected) surface values from April and May 2003 are also presented for case studies in Spain and
California as well as preliminary comparisons with field data from the Devil’s Rock Surfrad/BSRN site.
Author
Spectral Reflectance; MODIS (Radiometry); Bidirectional Reflectance; Aerosols; Albedo; Distribution Functions
20040070920 NASA Goddard Space Flight Center, Greenbelt, MD, USA
Stormtime Particle Energization with High Temporal Resolution AMIE Potentials
Khazanov, George V.; Liemohn, Michael W.; Fok, Mei-Ching; Newman, Timothy S.; Ridley, Aaron J.; [2004]; 2 pp.; In
English; No Copyright; Avail: Other Sources; Abstract Only
Simulations were conducted to investigate the influence of rapid electric field fluctuations on electron energization in the
inner magnetosphere based on the assimilative mapping of ionospheric electrodynamics (AMIE) technique. Simulations for
four different magnetic storms were run, namely those that occurred on May 15, 1997, May 4, 1998, September 25, 1998, and
October 19, 1998. Here, we have examined the formation of high energy (10-1000 keV) electrons in the inner magnetosphere
during these storm events with our recently-developed relativistic radiation belt transport code. The point of this numerical
experiment is to show that a simulation of a real event must have the high time resolution electric field input files in order
to produce the seed population for the radiation belts, which are often observed to increase in the days following a magnetic
storm. Specifically, a cadence of the global electric field pattern of 5 minutes or less produces inner magnetospheric fluxes that
are larger (by up to several orders of magnitude) than fluxes produced with a longer cadence. Differences were particularly
large relative to simulation results with a 3-hour time cadence, analogous to a Kp-driven electric field model.
Author
Temporal Resolution; Computerized Simulation; Magnetic Storms; Electrodynamics; Ionospheres; Thematic Mapping
20040070944 NASA Goddard Space Flight Center, Greenbelt, MD, USA
Accuracy and Precision in the Southern Hemisphere Additional Ozonesondes (SHADOZ) Dataset 1998-2000 in Light
of the JOSIE-2000 Results
Witte, J. C.; Thompson, A. M.; Schmidlin, F. J.; Oltmans, S. J.; McPeters, R. D.; Smit, H. G. J.; 2003; 1 pp.; In English; Fall
AGU Meeting 2003, 8-12 Dec. 2003, San Francisco, CA, USA; No Copyright; Avail: Other Sources; Abstract Only
A network of 12 southern hemisphere tropical and subtropical stations in the Southern Hemisphere ADditional
OZonesondes (SHADOZ) project has provided over 2000 profiles of stratospheric and tropospheric ozone since 1998.
Balloon-borne electrochemical concentration cell (ECC) ozonesondes are used with standard radiosondes for pressure,
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