Table of Contents - The Atmospheric Studies Group at TRC
Table of Contents - The Atmospheric Studies Group at TRC Table of Contents - The Atmospheric Studies Group at TRC
Section 9: CALPUFF Table 9-11: PLMMET.DAT File - Data Records (One record per hour) Records 2,3,4,... Hourly meteorological data. Columns Variable Type Description Base Data 1-2 3-4 5-6 7-8 9-11 12-16 17-20 21-22 23-27 28-32 33-37 38-42 43-52 IY IM ID IH TMPC WSPD IWD KST * ZMIX SIGTHA PLEXP PTGDF DECAY integer integer integer integer real real integer character real real real real real Year of data in record Month Day Hour (1-24) time at end of hour Temperature (deg. C) Wind speed (m/s) Wind direction (deg.) Stability class (A-F) Mixing height (m) σ θ (deg.). Or use PROFILE.DAT file for turbulence measurements. Wind speed power law exponent Potential temperature gradient (deg. K/m) Decay constant (s -1 ). Not used by CALPUFF. Extended Data 53-55 56-64 65-73 74-76 IPC PMMHR QSWRAD IRELHUM integer real real integer Precipitation type code 0 - no precipitation 1 to 18 - liquid precipitation 19 to 45 - frozen precipitation Precipitation rate (mm/hr) Short-wave solar radiation (W/m 2 ) Relative humidity (%) * KST is converted from character (A-F) to integer (1-6) 9-150
Section 9: CALPUFF 9.2.4 SURFACE.DAT and PROFILE.DAT In addition to the capability to use three-dimensional wind fields generated by CALMET, a single-station meteorological file can also be used by CALPUFF as its source of meteorological data. One form of single station data accepted by CALPUFF is the CTDMPLUS (Perry et al., 1989) form. The standard meteorological data files SURFACE.DAT and PROFILE.DAT can be used without modification, although some CALPUFF options require additional meteorological variables that must be added as part of an extended data record to SURFACE.DAT and PROFILE.DAT. Unlike the other two types of singlestation data described above, the PROFILE.DAT file contains a vertical profile of data each hour, rather than measurements made at a single height above ground. In this way, more detailed data from an on-site tower with supporting remote measurement platforms (e.g., SODAR) can be used to define the vertical structure of the flow. SURFACE.DAT contains calculated micrometeorological variables and the mixing height. This extended SURFACE.DAT and PROFILE.DAT formats have been modified further to allow sub-hourly time steps. CALPUFF is normally run with a full three-dimensional wind field and temperature field, as well as twodimensional fields of mixing heights and other meteorological variables (see CALMET.DAT in Section 9.2.1). However, in some near-field applications, when spatial variability of the meteorological fields may not be significant (e.g., uniform terrain and land use), the single-station data file may be used. In single station mode, CALPUFF assigns the single value of each variable read from the file to all grid points, resulting in a spatially uniform gridded field. However, the model does not assume the meteorological conditions are steady-state, which allows the important effects of causality to be simulated even with the single-station meteorological data. For example, the time required for plume material to reach a receptor is accounted for in the puff formulation, and curved trajectories and variable dispersion and stability conditions over multiple hours of transport will result even when using the single-station meteorological data. However, in general, the preferred mode for most applications of CALPUFF is to use the spatially variable fields generated by CALMET. SURFACE.DAT is created by the CTDMPLUS meteorological preprocessor, and the user should consult the CTDMPLUS documentation to learn of its use and requirements. SURFACE.DAT includes hourly mixing height, surface friction velocity, Monin-Obukhov length, and surface roughness. PROFILE.DAT is created directly by the user. In standard form, it includes the hourly wind direction, wind speed (vector and scalar), temperature, and turbulence ( w , and either v or ) at each measurement level. Note that PROFILE.DAT uses wind direction in the usual meteorological convention (i.e., winds from the west blowing toward the east has a value of 270°). As an option, a non-standard, or extended version of PROFILE.DAT can also be used to provide the temperature jump across an inversion above a mixed layer. This jump is used as a measure of the strength of the temperature inversion when assessing the ability of a buoyant plume to penetrate the top of the mixed layer (for the partial penetration option: MPARTL = 1). When a positive temperature difference is provided at the end of the first record for the hour, CALPUFF will recognize it and use it. Otherwise, 9-151
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- Page 585: Section 9: CALPUFF Table 9-10: PLMM
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- Page 593 and 594: Section 9: CALPUFF Table 9-14: SURF
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- Page 599 and 600: Section 9: CALPUFF 9.3 Point Source
- Page 601 and 602: Section 9: CALPUFF Table 9-17: PTEM
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Section 9: CALPUFF<br />
<strong>Table</strong> 9-11:<br />
PLMMET.DAT File - D<strong>at</strong>a Records<br />
(One record per hour)<br />
Records 2,3,4,... Hourly meteorological d<strong>at</strong>a.<br />
Columns Variable Type Description<br />
Base D<strong>at</strong>a<br />
1-2<br />
3-4<br />
5-6<br />
7-8<br />
9-11<br />
12-16<br />
17-20<br />
21-22<br />
23-27<br />
28-32<br />
33-37<br />
38-42<br />
43-52<br />
IY<br />
IM<br />
ID<br />
IH<br />
TMPC<br />
WSPD<br />
IWD<br />
KST *<br />
ZMIX<br />
SIGTHA<br />
PLEXP<br />
PTGDF<br />
DECAY<br />
integer<br />
integer<br />
integer<br />
integer<br />
real<br />
real<br />
integer<br />
character<br />
real<br />
real<br />
real<br />
real<br />
real<br />
Year <strong>of</strong> d<strong>at</strong>a in record<br />
Month<br />
Day<br />
Hour (1-24) time <strong>at</strong> end <strong>of</strong> hour<br />
Temper<strong>at</strong>ure (deg. C)<br />
Wind speed (m/s)<br />
Wind direction (deg.)<br />
Stability class (A-F)<br />
Mixing height (m)<br />
σ θ (deg.). Or use PROFILE.DAT file<br />
for turbulence measurements.<br />
Wind speed power law exponent<br />
Potential temper<strong>at</strong>ure gradient (deg. K/m)<br />
Decay constant (s -1 ). Not used by CALPUFF.<br />
Extended D<strong>at</strong>a<br />
53-55<br />
56-64<br />
65-73<br />
74-76<br />
IPC<br />
PMMHR<br />
QSWRAD<br />
IRELHUM<br />
integer<br />
real<br />
real<br />
integer<br />
Precipit<strong>at</strong>ion type code<br />
0 - no precipit<strong>at</strong>ion<br />
1 to 18 - liquid precipit<strong>at</strong>ion<br />
19 to 45 - frozen precipit<strong>at</strong>ion<br />
Precipit<strong>at</strong>ion r<strong>at</strong>e (mm/hr)<br />
Short-wave solar radi<strong>at</strong>ion (W/m 2 )<br />
Rel<strong>at</strong>ive humidity (%)<br />
* KST is converted from character (A-F) to integer (1-6)<br />
9-150