Card Group 16 - NON-GRIDDED RECEPTOR COORDINATES. 'nrec' cards

required - one for each non-gridded receptor

Columns Typ Variable Description Recommended Value *


1-10 RAE xrec X-coordinate of non- As Appropriate

gridded receptor (in

meteorological grid


11-20 RAE yrec Y-coordinate of non- As Appropriate

gridded receptor (in

met grid units)

The codes under type correspond to the following: *

I Integer Variable

IA Integer Array

IAE Integer Array Element

R Real Variable

RA Real Array

RAE Real Array Element

C Character Variable

CA Character Array

L Logical Variable




The primary sources of anthropogenically induced, regional

visibility degradation (also referred to as regional haze),

measured as light extinction, are fine particles (diameters

2.5 μm) in the atmosphere. In the eastern U.S., these

anthropogenic particles are composed primarily of sulfate (SO ) =


compounds, organic compounds, and to a much lesser extent,

nitrate (NO ) compounds. These are important constituents in 


other areas of the U.S. as well; their relative importance,

however, changes. For example, in some areas of the Pacific

Northwest, organic aerosols are as, or more, important than SO=


aerosols. In some parts of Southern California, NO aerosols 


are the dominant specie. When examining individual source's or

groups of sources' impacts on regional visibility degradation,

primary emissions of fine particulate should also be


The generally observed sulfate compound is ammonium

sulfate {(NH ) SO }, although ammonium bisulfate and un- 4 2 4

neutralized sulfuric acid particles have also been measured.

Particles composed of nitrate compounds usually take the form

of ammonium nitrate {NH NO }. These compounds are generally not 4 3

directly emitted from air pollutant sources, but are formed

through a series of chemical reactions in the atmosphere. The

air pollutants, which contribute to the formation of these

particles, are gaseous emissions of oxides of sulfur and

nitrogen (SO and NO ), which eventually oxidize to form SO and X X 4


nitric acid (HNO ), as well as other compounds, and 3

utlimately react with natural and anthropogenic emissions of

ammonia. The formation of NH NO is dependent on the 4 3

concentrations of ammonia gas (NH ) and nitric acid (HNO ) as 3 3

well as the concentration of SO . SO competes with HNO for = =


n1301 - n1302 - n1303 - n1304 - n1305 - n1306 - n1307 - n1308 - n1309 - n1310 - n1311 - n1312 - n1313 - n1314 - n1315 - n1316 - n1317 - n1318 - n1319 - n1320 - n1321 - n1322 - n1323 - n1324 - n1325 - n1326 - n1327 - n1328 - n1329 - n1330 - n1331 - n1332 - n1333 - n1334 - n1335 - n1336 - n1337 - n1338 - n1339 - n1340 - n1341 - n1342 - n1343 - n1344 - n1345 - n1346 - n13247 - n1348 - n1349 - n1350


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