SHARC (Strategic High-Altitude Radiance Code). A computer model for calculating atmospheric radiation under non-equilibrium conditions

Technical Report · Wed Feb 01 04:00:00 EST 1989

OSTI ID:5747260

Sharma, R; Ratkowski, A J; Sundberg, R L; Duff, J W; Bernstein, L S

The Strategic High-Altitude Radiance Code (SHARC ) is a new computer code that calculates atmospheric radiation for paths from 60 to 300 km altitude in the 2-40 micro spectral region. It models radiation due to NLTE (Non-Local Thermodynamic Equilibrium) molecular emissions which are the dominant sources at these altitudes. The initial version of SHARC, which is described in this paper, includes the five strongest IR radiators, CO/sub 2/, NO, O/sub 3/, H/sub 2/O and CO. Calculation of excited state populations is accomplished by interfacing a Monte Carlo model for radiative excitation and energy transfer with a highly flexible chemical kinetics module derived from the Sandia CHEMKIN Code. An equivalent-width, line-by-line approach for the radiation transport gives a spectral resolution of about 0.50/cm. The radiative-transport calculation includes the effects of combined Doppler-Lorentz (Voigt) line shapes. Particular emphasis was placed on modular construction and supporting data files so that models and model parameters can be modified or upgraded as additional data become available. The initial version of SHARC is now ready for distribution.

• Research Organization: Air Force Geophysics Lab., Hanscom AFB, MA (USA)
• OSTI ID: 5747260
• Report Number(s): AD-A-206236/2/XAB; AFGL-TR-89-0083
• Country of Publication: United States
• Language: English

Related Subjects

500100* -- Environment
Atmospheric-- Basic Studies-- (-1989)
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
COMPUTER CODES
COMPUTERIZED SIMULATION
EARTH ATMOSPHERE
EMISSION SPECTRA
ENERGY TRANSFER
ENERGY-LEVEL TRANSITIONS
EXCITATION
KINETICS
MONTE CARLO METHOD
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
RADIATION TRANSPORT
RADIATIONS
REACTION KINETICS
RESOLUTION
SIMULATION
SPECTRA