Simulation of precipitation scavenging in a three-dimensional global model

Conference · Fri Mar 01 04:00:00 EST 1991

OSTI ID:5631644

Sperber, K R; Penner, J E; Walton, J J ^[1]; Hameed, S ^[2]

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1. Lawrence Livermore National Lab., CA (USA)
2. State Univ. of New York, Stony Brook, NY (USA). Inst. for Terrestrial and Planetary Atmospheres

We investigate the wet deposition of nitrate in a three-dimensional model of the reactive nitrogen cycle using the Lagrangian transport scheme of Walton et al., (1988). Known sources of reactive nitrogen are included and meteorological fields from the Lawrence Livermore version of the NCAR CCM are input to the Lagrangian transport model for January and July simulations. Two scavenging rate parameterizations are used, one in which removal depends upon the simulated precipitation rates, and an alternate Monte Carlo scheme which reproduces the frequency distribution of observed removal rates (Sperber and Hameed 1986a). The precipitation rate dependent scheme results in a substantial underestimate of nitrate deposition in regions where observations are available. The Monte Carlo scheme generally results in deposition which is more comparable to observations. The more effective removal results in lower surface air NO{sub x} concentrations. In July, this scheme overestimates deposition over the United States and western Europe. However it is believed that the overestimate is related to inadequate sampling of precipitation duration statistics due to the overestimate is related to inadequate sampling of precipitation duration statistics due to the the twelve hour timestep at which precipitation is updated. Simulations to investigate this hypothesis are currently being planned. 27 refs., 5 figs., 2 tabs.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• Sponsoring Organization: DOE; EPA; USDOE, Washington, DC (USA); Environmental Protection Agency, Washington, DC (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5631644
• Report Number(s): UCRL-JC-106107; CONF-9107104--1; ON: DE91011531
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
ACID RAIN
AIR POLLUTION
ATMOSPHERIC PRECIPITATIONS
CHALCOGENIDES
CLIMATE MODELS
ENVIRONMENTAL TRANSPORT
GLOBAL ASPECTS
MASS TRANSFER
MATHEMATICAL MODELS
METEOROLOGY
MONTE CARLO METHOD
NITROGEN COMPOUNDS
NITROGEN CYCLE
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
POLLUTION
RAIN
SEASONAL VARIATIONS
SIMULATION
VARIATIONS