Particle NO3-
Replacement Statistics (Home)
Due to a particle nitrate sampling protocol change in 1995 across the IMPROVE network, ammonium nitrate mass concentrations in all derived quantities which include NO3-, such as ammonium nitrate, RCFM, and optical parameters reconstructed from the aerosol data, have been replaced with a constant nitrate value in the database available on the IMPROVE and WRAP Web Sites. In general, this constant value is the average ammonium nitrate mass concentration obtained over the sampling period subsequent to the protocol change, or 1996 – 1999. In the event a monitoring location does not have values for this period, values prior to the protocol change were used.
For data after February 2000, daily particle nitrate values are used to estimate ammonium nitrate.
The
intent of replacing ammonium nitrate mass concentrations with a constant value
is to make trend analyses insensitive to the protocol change. In our opinion it is preferable to keep an
estimate of ammonium nitrate mass in derived quantities because particle
nitrate constitutes a fairly large portion of the particle mass, and hence
light extinction budget at many monitoring sites. Data users wishing to incorporate daily NO3-
values in their analyses can make use of these data by downloading them
separately from the database.
Below
is a table of ammonium nitrate replacement statistics for (Parameter) NH4_NO3,
(Attribute) Value and derived (DE) values which use ammonium nitrate in the
IMPROVE and WRAP databases. Listed are
the monitoring site abbreviation, the begin and end year from which the average
ammonium nitrate values were calculated, the average ammonium nitrate value
itself, the standard deviation of these values, and the number of individual
measurements used to calculate the average.
|
|
BEGIN |
END |
AVE |
STDEV |
|
|
SITE |
(yr) |
(yr) |
(ng/m3) |
(ng/m3) |
N |
|
ABBO1 |
1988 |
1995 |
1743.9 |
1281.3 |
114 |
|
ACAD1 |
1996 |
1999 |
215.9 |
213.6 |
399 |
|
ADPI1 |
|
|
|
|
|
|
AGTI1 |
|
|
|
|
|
|
ARCH1 |
1988 |
1995 |
393.3 |
793.4 |
406 |
|
AREN1 |
|
|
|
|
|
|
BADL1 |
1996 |
1999 |
383.7 |
795.2 |
404 |
|
BALD1 |
|
|
|
|
|
|
BAND1 |
1996 |
1999 |
162.2 |
192.4 |
402 |
|
BIBE1 |
1996 |
1999 |
195.1 |
163.3 |
361 |
|
BLIS1 |
1996 |
1999 |
157.3 |
142.0 |
228 |
|
BOAP1 |
|
|
|
|
|
|
BOND1 |
|
|
|
|
|
|
BOWA1 |
1996 |
1999 |
433.8 |
882.0 |
281 |
|
BRCA1 |
1996 |
1999 |
175.2 |
166.1 |
399 |
|
BRET1 |
|
|
|
|
|
|
BRID1 |
1996 |
1999 |
103.3 |
84.7 |
391 |
|
BRIG1 |
1996 |
1999 |
658.1 |
564.5 |
339 |
|
BRLA1 |
|
|
|
|
|
|
BRMA1 |
|
|
|
|
|
|
BRMA1 |
|
|
|
|
|
|
BURL2 |
|
|
|
|
|
|
CABA1 |
|
|
|
|
|
|
CABI1 |
|
|
|
|
|
|
CACO1 |
|
|
|
|
|
|
CACR1 |
|
|
|
|
|
|
CADI1 |
|
|
|
|
|
|
CANY1 |
1996 |
1999 |
152.4 |
147.6 |
393 |
|
CAPI1 |
|
|
|
|
|
|
CARE1 |
|
|
|
|
|
|
CHAS1 |
1996 |
1999 |
355.1 |
187.4 |
360 |
|
CHIL1 |
1988 |
1995 |
1572.4 |
1143.9 |
113 |
|
CHIR1 |
1996 |
1999 |
137.0 |
111.4 |
394 |
|
COGO1 |
1996 |
1999 |
398.1 |
282.8 |
207 |
|
COHI1 |
|
|
|
|
|
|
COHU1 |
|
|
|
|
|
|
CORI1 |
1996 |
1999 |
460.3 |
660.5 |
400 |
|
CRLA1 |
1996 |
1999 |
74.4 |
77.2 |
373 |
|
CRMO1 |
|
|
|
|
|
|
DENA1 |
1996 |
1999 |
42.2 |
52.4 |
387 |
|
DEVA1 |
|
|
|
|
|
|
DOLA1 |
1996 |
1999 |
533.8 |
428.3 |
65 |
|
DOSO1 |
1996 |
1999 |
363.4 |
403.9 |
375 |
|
EVER1 |
1988 |
1995 |
476.9 |
310.2 |
250 |
|
GAMO1 |
|
|
|
|
|
|
GICL1 |
1996 |
1999 |
101.3 |
86.9 |
395 |
|
GILA1 |
|
|
|
|
|
|
GLAC1 |
1996 |
1999 |
178.8 |
217.9 |
406 |
|
GRBA1 |
1996 |
1999 |
115.4 |
115.7 |
407 |
|
GRCA1 |
1996 |
1999 |
157.7 |
142.2 |
273 |
|
GRCA2 |
|
|
|
|
|
|
GRGU1 |
1996 |
1999 |
78.9 |
50.0 |
146 |
|
GRSA1 |
1996 |
1999 |
129.5 |
125.0 |
412 |
|
GRSM1 |
1996 |
1999 |
252.2 |
246.5 |
373 |
|
GRVS1 |
1996 |
1999 |
253.2 |
225.2 |
225 |
|
GUMO1 |
1996 |
1999 |
210.2 |
191.5 |
398 |
|
HALE1 |
|
|
|
|
|
|
HANC1 |
1996 |
1999 |
125.5 |
123.9 |
175 |
|
HAVO1 |
1988 |
1995 |
59.2 |
50.6 |
402 |
|
HECA1 |
|
|
|
|
|
|
HEGL1 |
|
|
|
|
|
|
HILL1 |
|
|
|
|
|
|
HOOV1 |
|
|
|
|
|
|
IKBA1 |
|
|
|
|
|
|
INGA1 |
1996 |
1999 |
158.8 |
127.2 |
262 |
|
INGA2 |
|
|
|
|
|
|
ISLE1 |
1996 |
1999 |
1722.5 |
2462.5 |
9 |
|
ISRO1 |
1988 |
1995 |
357.3 |
1099.3 |
176 |
|
JARB1 |
1996 |
1999 |
102.3 |
238.5 |
349 |
|
JEFF1 |
1996 |
1999 |
467.7 |
585.1 |
329 |
|
JOTR1 |
1988 |
1995 |
1199.5 |
1598.7 |
67 |
|
KAIS1 |
|
|
|
|
|
|
KALM1 |
|
|
|
|
|
|
LABE1 |
|
|
|
|
|
|
LAVO1 |
1996 |
1999 |
132.5 |
178.2 |
378 |
|
LIGO1 |
|
|
|
|
|
|
LIVO1 |
|
|
|
|
|
|
LOPE1 |
1996 |
1999 |
507.7 |
823.5 |
378 |
|
LOST1 |
|
|
|
|
|
|
LYBR1 |
1996 |
1999 |
341.8 |
406.2 |
354 |
|
LYND1 |
1996 |
1999 |
974.0 |
710.0 |
137 |
|
MACA1 |
1996 |
1999 |
487.7 |
454.1 |
355 |
|
MALO1 |
|
|
|
|
|
|
MALO2 |
|
|
|
|
|
|
MALO3 |
|
|
|
|
|
|
MALO4 |
|
|
|
|
|
|
MAVI1 |
|
|
|
|
|
|
MEAD1 |
1988 |
1995 |
165.0 |
145.1 |
63 |
|
MELA1 |
1996 |
1999 |
227.5 |
247.0 |
4 |
|
MEVE1 |
1996 |
1999 |
114.7 |
86.8 |
374 |
|
MING1 |
|
|
|
|
|
|
MKGO1 |
|
|
|
|
|
|
MOHO1 |
|
|
|
|
|
|
MOMO1 |
|
|
|
|
|
|
MOMO1 |
|
|
|
|
|
|
MONT1 |
|
|
|
|
|
|
MOOS1 |
1996 |
1999 |
216.2 |
210.0 |
389 |
|
MORA1 |
1996 |
1999 |
140.3 |
146.1 |
397 |
|
MOZI1 |
1996 |
1999 |
114.0 |
78.8 |
383 |
|
MOZI3 |
1988 |
1995 |
179.2 |
140.1 |
56 |
|
NOAB1 |
|
|
|
|
|
|
NOCA1 |
|
|
|
|
|
|
OKEF1 |
1996 |
1999 |
312.4 |
207.3 |
346 |
|
OLTO1 |
|
|
|
|
|
|
OLYM1 |
|
|
|
|
|
|
ORPI1 |
|
|
|
|
|
|
PASA1 |
|
|
|
|
|
|
PEFO1 |
1996 |
1999 |
154.1 |
119.2 |
362 |
|
PHOE1 |
|
|
|
|
|
|
PINN1 |
1996 |
1999 |
651.4 |
505.7 |
348 |
|
PMRF1 |
|
|
|
|
|
|
PMRF1 |
|
|
|
|
|
|
PMRF2 |
|
|
|
|
|
|
PORE1 |
1996 |
1999 |
639.9 |
935.7 |
330 |
|
PRIS1 |
|
|
|
|
|
|
PUSO1 |
1996 |
1999 |
547.5 |
337.0 |
355 |
|
QUCI1 |
|
|
|
|
|
|
QURE1 |
|
|
|
|
|
|
QURE1 |
|
|
|
|
|
|
QUVA1 |
|
|
|
|
|
|
RAFA1 |
|
|
|
|
|
|
REDW1 |
1996 |
1999 |
229.7 |
211.6 |
380 |
|
RING1 |
|
|
|
|
|
|
ROMA1 |
1996 |
1999 |
354.5 |
241.6 |
326 |
|
ROMO1 |
1988 |
1995 |
267.4 |
440.6 |
245 |
|
ROMO2 |
1996 |
1999 |
176.8 |
217.4 |
384 |
|
SAAN1 |
|
|
|
|
|
|
SACR1 |
|
|
|
|
|
|
SAGA1 |
|
|
|
|
|
|
SAGO1 |
1996 |
1999 |
1946.8 |
1808.0 |
321 |
|
SAGU1 |
1988 |
1995 |
344.8 |
446.9 |
443 |
|
SALM1 |
|
|
|
|
|
|
SAMA1 |
|
|
|
|
|
|
SAPE1 |
|
|
|
|
|
|
SAWE1 |
|
|
|
|
|
|
SAWT1 |
|
|
|
|
|
|
SCOV1 |
|
|
|
|
|
|
SENE1 |
1996 |
1999 |
1302.9 |
1458.6 |
9 |
|
SEQU1 |
1996 |
1999 |
1230.3 |
1790.3 |
367 |
|
SHEN1 |
1996 |
1999 |
417.6 |
454.5 |
345 |
|
SHRO1 |
1996 |
1999 |
176.2 |
132.4 |
307 |
|
SIAN1 |
|
|
|
|
|
|
SIKE1 |
|
|
|
|
|
|
SIME1 |
|
|
|
|
|
|
SIPS1 |
1996 |
1999 |
565.5 |
559.2 |
249 |
|
SNPA1 |
1996 |
1999 |
235.9 |
196.7 |
317 |
|
SOLA1 |
1996 |
1999 |
278.8 |
201.5 |
247 |
|
SPOK1 |
|
|
|
|
|
|
STAR1 |
|
|
|
|
|
|
SULA1 |
|
|
|
|
|
|
SUMO1 |
|
|
|
|
|
|
SWAN1 |
|
|
|
|
|
|
SYCA1 |
1988 |
1995 |
190.0 |
95.4 |
71 |
|
THRO1 |
1996 |
1999 |
193.2 |
232.7 |
4 |
|
THSI1 |
1996 |
1999 |
95.1 |
116.7 |
393 |
|
TONT1 |
1996 |
1999 |
250.7 |
218.6 |
400 |
|
TRCR1 |
|
|
|
|
|
|
TRIN1 |
|
|
|
|
|
|
TUXE1 |
|
|
|
|
|
|
ULBE1 |
|
|
|
|
|
|
UPBU1 |
1996 |
1999 |
730.4 |
989.0 |
383 |
|
VIIS1 |
1996 |
1999 |
255.7 |
131.8 |
131 |
|
VOYA1 |
1996 |
1999 |
2655.2 |
2227.1 |
9 |
|
WASH1 |
1996 |
1999 |
1224.3 |
1131.7 |
328 |
|
WEMI1 |
1996 |
1999 |
87.0 |
73.6 |
381 |
|
WHIT1 |
|
|
|
|
|
|
WHMO1 |
|
|
|
|
|
|
WHPA1 |
|
|
|
|
|
|
WHPE1 |
|
|
|
|
|
|
WHRI1 |
|
|
|
|
|
|
WIBA1 |
|
|
|
|
|
|
WIBA2 |
|
|
|
|
|
|
WICA1 |
|
|
|
|
|
|
WIMO1 |
|
|
|
|
|
|
YELL1 |
1996 |
1999 |
112.1 |
93.9 |
383 |
|
YOSE1 |
1996 |
1999 |
294.0 |
374.5 |
390 |
|
ZION1 |
|
|
|
|
|