Atmospheric Chemistry and Physics Implementing growth and sedimentation of NAT particles in a global Eulerian model
Abstract. Here we present a concise and efficient algorithm to mimic the growth and sedimentation of Nitric Acid Trihydate (NAT) particles in the polar vortex in a state-of-theart 3D chemistry transport model. The particle growth and sedimentation are calculated using the microphysical formulation o...
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| Format: | Text |
| Language: | English |
| Published: |
2004
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.405.320 http://hal.archives-ouvertes.fr/docs/00/29/55/28/PDF/acp-4-1869-2004.pdf |
| Summary: | Abstract. Here we present a concise and efficient algorithm to mimic the growth and sedimentation of Nitric Acid Trihydate (NAT) particles in the polar vortex in a state-of-theart 3D chemistry transport model. The particle growth and sedimentation are calculated using the microphysical formulation of Carslaw et al. (2002). Once formed, NAT particles are transported in the model as tracers in the form of sizesegregated quantities or size bins. Two different approaches were adopted for this purpose: one assuming a fixed particle number density (“FixedDens”) and the other assuming a discrete set of particle diameter values (“FixedRad”). Simulations were performed for three separate 10-day periods during the 1999–2000 Arctic winter and compared to the results of an existing Lagrangian model study, which uses similar microphysics in a computationally more expensive method |
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