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Table of Contents - The Atmospheric Studies Group at TRC

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Section 9: CALPUFF<br />

MSHEAR integer Vertical wind shear above stack top modeled in<br />

plume rise<br />

(0 = no, 1 = yes)<br />

MSPLIT<br />

Puff splitting allowed <br />

integer<br />

(0 = no, 1 = yes)<br />

0<br />

0<br />

<strong>Table</strong> 9-3 (Continued)<br />

CALPUFF Control File Inputs - Input <strong>Group</strong> 2<br />

Technical Options<br />

Variable Type Description Default Value<br />

MCHEM integer Chemical mechanism flag.<br />

0 = chemical transform<strong>at</strong>ion not modeled<br />

1 = transform<strong>at</strong>ion r<strong>at</strong>es computed internally<br />

(MESOPUFF II scheme)<br />

2 = user specified transform<strong>at</strong>ion r<strong>at</strong>es used (If<br />

MCHEM = 2, the user must prepare a file<br />

(CHEM.DAT) with a diurnal cycle <strong>of</strong><br />

transform<strong>at</strong>ion r<strong>at</strong>es)<br />

3 = transform<strong>at</strong>ion r<strong>at</strong>es computed internally<br />

(RIVAD/ARM3 scheme)<br />

4 = secondary organic aerosol form<strong>at</strong>ion computed<br />

(MESOPUFF II scheme for OH)<br />

5 = user-specified half-life with or without transfer<br />

to child species<br />

6 = transform<strong>at</strong>ion r<strong>at</strong>es computed internally<br />

(Upd<strong>at</strong>ed RIVAD scheme with ISORROPIA<br />

equilibrium)<br />

7 = transform<strong>at</strong>ion r<strong>at</strong>es computed internally<br />

(Upd<strong>at</strong>ed RIVAD scheme with ISORROPIA<br />

equilibrium and CalTech SOA<br />

MAQCHEM integer Aqueous phase transform<strong>at</strong>ion modeled <br />

(Used only if MCHEM = 6, or 7)<br />

(0 = no, 1 = yes, transform<strong>at</strong>ion r<strong>at</strong>es and wet<br />

scavenging coefficients adjusted for in-cloud<br />

aqueous phase reactions)<br />

1<br />

0<br />

9-57

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