U.S. Geological Survey Open-File Report 09-0346
Trends in Precipitation Chemistry in the United States,
1983-1994: An Analysis of the Effects in 1995 of Phase I of the Clean Air Act Amendments of 1990, Title IV
Table A.11. Changes in the intercept of the deseasonalized trend model
during 1995 relative to the 1983-94 trend period.
Significance values, p, are those for a binary, 1983-94 vs.
1995, indicator variable added to the trend model.
Hydrogen Ion Sulfate Nitrate Chloride
_____________ _____________ _____________ _____________
1995 1995 1995 1995
Region Site Effect p Effect p Effect p Effect p
-----------------------------------------------------------------------
NE il11 - 0.0200 - 0.2323 + 0.3326 + 0.9144
il18 - 0.2866 - 0.1940 - 0.2982 - 0.0067
il63 - 0.0003 - 0.0010 - 0.6054 - 0.0953
in20 - 0.4259 + 0.1272 + 0.0628 + 0.0250
in34 - 0.1136 + 0.8516 + 0.2549 + 0.3677
in41 - 0.7193 + 0.4504 + 0.0274 + 0.0784
ky03 - 0.0017 - 0.0010 - 0.5825 - 0.6444
ky22 - 0.7927 - 0.9900 + 0.1171 + 0.1686
ky38 - 0.2503 - 0.1893 + 0.8395 - 0.9362
ma08 - 0.3801 - 0.5688 + 0.8688 + 0.0800
ma13 + 0.6525 - 0.0850 - 0.7829 + 0.1436
md03 - 0.0002 - 0.0008 - 0.0618 + 0.6231
md13 - 0.1306 - 0.1016 - 0.7238 + 0.4132
me00 - 0.3113 - 0.0154 - 0.4037 + 0.6212
me09 - 0.0917 - 0.0957 - 0.2542 + 0.1161
mi09 - 0.7117 + 0.5359 + 0.1491 + 0.5615
mi26 + 0.9873 + 0.0415 + 0.0106 + 0.2743
mi53 - 0.1856 - 0.2268 - 0.9148 - 0.8971
mi98 - 0.4045 - 0.3243 - 0.4943 - 0.5777
mi99 - 0.1670 - 0.3041 - 0.9596 + 0.4423
nh02 - 0.5545 - 0.2005 + 0.9459 + 0.1445
nj99 - 0.3784 - 0.0494 + 0.8394 + 0.8827
ny08 - 0.1253 - 0.1222 - 0.9844 - 0.9231
ny20 - 0.1758 - 0.3518 + 0.8060 + 0.1629
ny52 - 0.1431 - 0.4144 + 0.2198 + 0.0002
ny65 - 0.0098 - 0.0266 - 0.4819 - 0.9486
ny68 - 0.1027 - 0.1134 - 0.3545 - 0.8890
ny98 - 0.7032 - 0.4226 + 0.3298 + 0.3288
ny99 - 0.0588 - 0.1524 - 0.9702 + 0.4999
oh17 - 0.0343 - 0.0076 - 0.9731 + 0.9695
oh49 - 0.0184 - 0.0289 - 0.4724 - 0.7257
oh71 - 0.0466 - 0.0587 - 0.6990 + 0.4755
pa15 - 0.1210 - 0.1322 + 0.8472 + 0.5899
pa29 - 0.3003 - 0.1929 + 0.3333 + 0.9345
pa42 - 0.1412 - 0.1453 + 0.8159 - 0.2374
pa72 - 0.2627 - 0.1723 + 0.9975 + 0.9663
va00 - 0.2323 - 0.1570 + 0.9543 + 0.0640
va13 - 0.1929 - 0.1647 - 0.8896 + 0.4601
va28 - 0.0184 - 0.0311 - 0.3142 + 0.0296
vt01 - 0.1435 - 0.1453 - 0.7265 - 0.3612
vt99 - 0.0225 - 0.0088 - 0.2614 + 0.4095
wi28 + 0.3113 + 0.1484 + 0.2562 + 0.0855
wi36 - 0.8748 - 0.4744 - 0.8068 - 0.9823
wi37 - 0.7761 - 0.5215 - 0.1628 + 0.3206
wi99 - 0.0721 - 0.2700 - 0.6757 - 0.4804
wv04 - 0.3478 - 0.3738 + 0.3615 + 0.1114
wv18 - 0.0078 - 0.0039 + 0.8802 + 0.8409
----------------------------------------------------------------
SE al10 - 0.4776 - 0.7191 + 0.6665 - 0.9193
fl03 - 0.0180 - 0.1186 - 0.4534 + 0.7751
fl11 + 0.1570 + 0.2658 + 0.4648 - 0.1779
fl41 - 0.6361 - 0.3756 - 0.2340 + 0.8814
ga41 - 0.2045 - 0.9672 + 0.2139 + 0.0791
ms10 + 0.7975 + 0.2125 + 0.1817 + 0.2284
ms30 - 0.9865 + 0.4249 + 0.2129 + 0.6853
-----------------------------------------------------------------------
-----------------------------------------------------------------------
Hydrogen Ion Sulfate Nitrate Chloride
_____________ _____________ _____________ _____________
1995 1995 1995 1995
Region Site Effect p Effect p Effect p Effect p
-----------------------------------------------------------------------
nc03 - 0.5510 - 0.5619 + 0.8496 + 0.1332
nc25 - 0.6623 - 0.8155 + 0.5079 - 0.4390
nc34 - 0.3029 - 0.2694 + 0.7835 - 0.6229
nc36 - 0.1039 - 0.0668 - 0.3279 + 0.2894
nc41 - 0.2779 - 0.1930 - 0.9793 + 0.0419
sc06 - 0.1093 - 0.4418 - 0.6005 - 0.6956
tn00 - 0.6080 + 0.4500 + 0.3886 + 0.8081
tn11 - 0.0535 - 0.0503 - 0.9207 + 0.9162
----------------------------------------------------------------
West ar02 - 0.9935 - 0.4060 + 0.8393 - 0.3492
ar03 + 0.6324 + 0.1509 + 0.0957 - 0.5090
ar27 + 0.3280 + 0.3039 + 0.4041 - 0.1749
az03 - 0.9869 + 0.8581 - 0.7252 + 0.7153
co00 + 0.8820 + 0.1571 + 0.2311 + 0.5107
co02 - 0.3230 + 0.4486 - 0.9821 + 0.5367
co15 - 0.1915 - 0.2508 - 0.0626 + 0.2577
co19 + 0.1518 + 0.1782 - 0.6031 - 0.7781
co22 + 0.1723 + 0.0853 + 0.1757 + 0.5588
co97 - 0.6517 - 0.1603 - 0.2674 - 0.4768
co98 + 0.5578 + 0.7284 - 0.5266 - 0.5083
co99 + 0.7369 + 0.6266 - 0.9466 + 0.7888
ia08 - 0.0157 - 0.3152 - 0.5311 - 0.9584
ia23 - 0.2045 + 0.6705 + 0.5952 + 0.4547
id03 + 0.9229 + 0.4151 + 0.9098 + 0.4167
id11 + 0.7390 - 0.1078 - 0.0142 - 0.5811
ks31 + 0.7944 - 0.6287 + 0.5695 - 0.4536
ks32 - 0.3002 - 0.8520 - 0.5427 + 0.3926
la12 - 0.7179 + 0.4267 + 0.2958 + 0.4121
la30 - 0.7347 + 0.3104 + 0.2053 + 0.1923
mn16 + 0.3880 - 0.6334 - 0.8926 - 0.9543
mn23 + 0.7511 - 0.6184 - 0.7736 - 0.5173
mo03 - 0.5250 - 0.8159 + 0.5717 - 0.7606
mt00 - 0.9061 - 0.5565 - 0.3750 + 0.3919
mt05 - 0.6248 - 0.0901 - 0.1991 + 0.8518
nd08 - 0.7759 + 0.8036 - 0.9061 - 0.3800
nm07 - 0.7822 - 0.7397 + 0.1398 + 0.0596
nm08 - 0.0068 + 0.2102 + 0.0369 + 0.0778
nm09 + 0.0383 + 0.0853 + 0.0639 + 0.1266
ok00 + 0.5862 - 0.9297 + 0.8269 - 0.8502
ok17 + 0.5670 + 0.6448 + 0.5738 - 0.8569
or09 - 0.7087 - 0.0789 - 0.0654 - 0.8849
or10 + 0.7809 - 0.8245 - 0.2130 + 0.7319
or18 - 0.9541 - 0.0035 - 0.0401 - 0.6482
or97 + 0.4236 - 0.1347 - 0.0646 - 0.2072
sd08 - 0.9707 - 0.8816 + 0.9533 + 0.7151
sd99 + 0.2204 - 0.7566 + 0.3984 - 0.9387
tx03 - 0.4019 + 0.8528 + 0.5825 + 0.1418
tx10 - 0.5409 + 0.9896 - 0.7231 + 0.7486
tx16 + 0.1946 + 0.3135 + 0.3599 + 0.3830
tx21 + 0.4313 + 0.1621 + 0.1219 - 0.9975
tx56 + 0.8017 + 0.1682 + 0.3072 - 0.5827
wa14 + 0.5786 + 0.5256 - 0.9915 + 0.3782
wa21 - 0.3729 - 0.2221 - 0.5770 + 0.1022
wy02 - 0.3546 + 0.1739 - 0.2736 + 0.2624
wy08 + 0.2385 - 0.0618 - 0.1747 - 0.3696
wy99 + 0.5726 + 0.0889 + 0.1105 + 0.0562
-----------------------------------------------------------------------
--------------------------------------------------------------------------------------
Ammonium Calcium Magnesium Potassium Sodium
_____________ _____________ _____________ _____________ _____________
1995 1995 1995 1995 1995
Region Site Effect p Effect p Effect p Effect p Effect p
--------------------------------------------------------------------------------------
NE il11 + 0.5340 + 0.1178 + 0.0143 + 0.0205 + 0.0143
il18 - 0.3913 + 0.9633 - 0.6925 - 0.4147 - 0.2060
il63 + 0.9431 + 0.4679 + 0.1575 + 0.0141 + 0.3479
in20 + 0.0383 + 0.0056 + 0.0001 + 0.0007 + 0.0053
in34 + 0.0544 + 0.3856 + 0.2704 + 0.0244 + 0.0412
in41 + 0.0385 + 0.0040 + 0.0163 + 0.0168 + 0.0102
ky03 - 0.9717 + 0.0366 + 0.7383 + 0.4537 + 0.5744
ky22 + 0.1020 + 0.0051 + 0.0017 + 0.0149 + 0.0528
ky38 - 0.8138 + 0.1839 + 0.2538 + 0.8471 + 0.2848
ma08 + 0.4144 + 0.0217 + 0.0023 + 0.0007 + 0.0431
ma13 + 0.3921 + 0.2830 + 0.0676 + 0.0501 + 0.0630
md03 - 0.2565 + 0.7039 + 0.2587 + 0.8291 + 0.1050
md13 + 0.6499 + 0.6129 + 0.3400 + 0.3066 + 0.2917
me00 - 0.4995 + 0.6915 + 0.0098 - 0.4293 + 0.0853
me09 - 0.9367 + 0.4568 + 0.0156 + 0.3876 + 0.0251
mi09 + 0.1130 + 0.0927 + 0.0307 + 0.2803 + 0.1320
mi26 + 0.0084 + 0.0206 + 0.0230 + 0.0100 + 0.1476
mi53 - 0.8127 + 0.6387 + 0.5392 + 0.6557 + 0.3658
mi98 - 0.1797 + 0.9289 + 0.1750 - 0.3955 + 0.1091
mi99 - 0.8368 + 0.3061 + 0.0249 + 0.1517 + 0.1234
nh02 + 0.2087 + 0.2511 + 0.0249 + 0.0278 + 0.0346
nj99 + 0.8339 + 0.5807 + 0.3425 + 0.2586 + 0.5726
ny08 + 0.7842 + 0.2234 + 0.1739 + 0.0111 + 0.1525
ny20 + 0.1176 + 0.1332 + 0.0122 + 0.0193 + 0.0183
ny52 + 0.2207 + 0.0265 + 0.0072 + 0.0001 + 0.0001
ny65 + 0.4637 + 0.3899 + 0.0977 + 0.0101 + 0.0136
ny68 + 0.5943 - 0.9328 + 0.6234 - 0.7654 + 0.5846
ny98 + 0.3367 + 0.3829 + 0.0403 + 0.1628 + 0.0391
ny99 + 0.8746 + 0.2553 + 0.0219 + 0.5024 + 0.0828
oh17 - 0.6965 + 0.4229 + 0.4035 + 0.8990 + 0.1705
oh49 + 0.6909 + 0.1326 + 0.0779 + 0.6124 + 0.3102
oh71 + 0.9962 + 0.7099 + 0.5317 + 0.5771 + 0.1406
pa15 + 0.5247 + 0.0916 + 0.0515 + 0.1152 + 0.0100
pa29 + 0.1750 + 0.2664 + 0.0672 + 0.1023 + 0.1108
pa42 - 0.8651 + 0.3837 + 0.3007 + 0.5258 + 0.1716
pa72 + 0.6322 + 0.9797 + 0.6329 + 0.3974 + 0.6661
va00 + 0.6405 + 0.1662 + 0.0362 + 0.1506 + 0.0318
va13 - 0.9243 + 0.5813 + 0.3554 + 0.3968 + 0.1720
va28 - 0.3470 + 0.7514 + 0.0005 + 0.5747 + 0.0017
vt01 + 0.5234 - 0.5057 + 0.8141 + 0.5907 + 0.5961
vt99 - 0.8085 - 0.6729 + 0.0316 + 0.1000 + 0.0300
wi28 + 0.2904 + 0.1565 + 0.1045 + 0.0904 + 0.0198
wi36 - 0.7135 + 0.4225 + 0.3083 + 0.3120 + 0.2387
wi37 - 0.3520 + 0.6271 + 0.2194 + 0.0025 + 0.0788
wi99 - 0.9410 + 0.7264 + 0.5925 + 0.7050 + 0.6977
wv04 + 0.1137 + 0.0326 + 0.0024 + 0.1271 + 0.0030
wv18 + 0.1878 + 0.9342 + 0.0353 - 0.7540 + 0.0480
-------------------------------------------------------------------------------
SE al10 + 0.1936 + 0.8094 + 0.4961 - 0.5431 + 0.5652
fl03 + 0.4808 + 0.9130 + 0.6310 + 0.2239 + 0.6719
fl11 + 0.8174 + 0.4715 - 0.4255 + 0.8790 - 0.4504
fl41 - 0.6142 - 0.3703 + 0.7035 + 0.2021 + 0.6321
ga41 + 0.0982 + 0.0018 + 0.0193 + 0.3655 + 0.0397
ms10 + 0.3354 + 0.1624 + 0.1740 + 0.6673 + 0.1016
ms30 + 0.4156 + 0.1122 + 0.1118 + 0.3329 + 0.1742
--------------------------------------------------------------------------------------
--------------------------------------------------------------------------------------
Ammonium Calcium Magnesium Potassium Sodium
_____________ _____________ _____________ _____________ _____________
1995 1995 1995 1995 1995
Region Site Effect p Effect p Effect p Effect p Effect p
--------------------------------------------------------------------------------------
nc03 + 0.9117 + 0.3667 + 0.0888 + 0.5914 + 0.0448
nc25 + 0.2411 + 0.1601 + 0.7207 + 0.2691 - 0.7733
nc34 + 0.2129 + 0.1917 + 0.5076 + 0.5151 - 0.7033
nc36 - 0.9839 + 0.4437 + 0.1064 + 0.5035 + 0.1706
nc41 - 0.5598 + 0.2626 + 0.0946 - 0.1359 + 0.0232
sc06 - 0.8070 - 0.7422 - 0.4437 - 0.6860 + 0.9992
tn00 + 0.1278 + 0.0014 + 0.0003 + 0.0001 + 0.3651
tn11 + 0.1698 + 0.4095 + 0.1659 + 0.4194 + 0.3161
-------------------------------------------------------------------------------
West ar02 + 0.6368 + 0.0049 + 0.2750 + 0.2166 - 0.4586
ar03 + 0.0848 + 0.0192 + 0.4316 + 0.4344 - 0.7732
ar27 + 0.3018 + 0.1534 + 0.6656 - 0.6617 + 0.8977
az03 + 0.7425 - 0.8635 - 0.9902 + 0.6934 + 0.6219
co00 + 0.4683 + 0.2260 + 0.0380 + 0.2906 + 0.0709
co02 - 0.6239 + 0.1169 + 0.0364 + 0.1170 + 0.4255
co15 - 0.7914 + 0.5070 + 0.1888 + 0.6070 + 0.2439
co19 + 0.8185 - 0.8731 + 0.2544 - 0.3551 + 0.3999
co22 + 0.1700 + 0.1890 + 0.0475 + 0.3008 + 0.2023
co97 - 0.5273 + 0.6362 + 0.5378 - 0.3333 - 0.6053
co98 + 0.5875 + 0.3787 + 0.1267 + 0.2795 + 0.7397
co99 + 0.2475 + 0.9349 + 0.8457 + 0.3392 + 0.4642
ia08 - 0.1959 + 0.0844 + 0.1026 + 0.0391 + 0.3078
ia23 + 0.9914 + 0.2938 + 0.2137 + 0.0635 + 0.0148
id03 - 0.7259 + 0.0387 + 0.0279 + 0.0196 + 0.2876
id11 - 0.0849 - 0.7589 + 0.8365 - 0.7903 - 0.6093
ks31 + 0.7409 - 0.8818 + 0.9208 + 0.5381 + 0.5208
ks32 - 0.7635 + 0.7529 + 0.2693 + 0.7741 + 0.1839
la12 + 0.3797 + 0.1062 + 0.1750 + 0.2561 + 0.2321
la30 + 0.0742 + 0.0116 + 0.0838 + 0.0310 + 0.1877
mn16 - 0.6023 - 0.4796 - 0.6499 - 0.5314 + 0.2014
mn23 - 0.0561 + 0.7968 + 0.7644 + 0.8442 + 0.3728
mo03 + 0.2720 + 0.2183 + 0.1278 + 0.1026 + 0.8405
mt00 - 0.7002 - 0.3288 - 0.6323 + 0.6457 + 0.3255
mt05 + 0.9852 - 0.0613 - 0.4884 - 0.0481 + 0.4462
nd08 - 0.9186 - 0.3264 - 0.3830 - 0.6611 + 0.7111
nm07 + 0.6835 + 0.1017 + 0.0066 + 0.1084 + 0.0216
nm08 + 0.5143 + 0.0113 + 0.0075 + 0.0032 + 0.0971
nm09 + 0.0695 + 0.0994 + 0.0376 + 0.1077 + 0.1559
ok00 + 0.8818 - 0.9408 + 0.9275 - 0.1445 - 0.9589
ok17 + 0.6692 + 0.8238 - 0.7519 - 0.7168 + 0.7985
or09 - 0.2182 - 0.1742 - 0.7202 + 0.7682 + 0.8144
or10 + 0.9427 + 0.4948 + 0.7203 + 0.2904 + 0.7573
or18 - 0.2092 - 0.8220 + 0.3759 - 0.5595 + 0.9929
or97 - 0.2719 - 0.6453 - 0.2383 - 0.0321 - 0.2957
sd08 - 0.7290 + 0.7656 + 0.4205 + 0.3060 + 0.4863
sd99 - 0.3653 - 0.2834 - 0.1813 + 0.2162 + 0.7081
tx03 + 0.9867 + 0.2823 + 0.2672 + 0.4973 + 0.1228
tx10 - 0.4040 + 0.1541 + 0.5095 - 0.1482 + 0.5448
tx16 + 0.4199 - 0.9343 + 0.3455 + 0.6948 + 0.2474
tx21 + 0.0325 + 0.0214 + 0.6390 - 0.9876 + 0.8356
tx56 - 0.9059 + 0.1346 + 0.2287 + 0.7734 + 0.7215
wa14 + 0.0619 + 0.6820 + 0.4258 + 0.4958 + 0.4573
wa21 + 0.8257 + 0.3985 + 0.0912 + 0.1727 + 0.0860
wy02 + 0.7797 + 0.4672 + 0.0507 + 0.1847 + 0.0125
wy08 - 0.4515 - 0.1102 - 0.4258 + 0.9944 - 0.2457
wy99 + 0.2571 + 0.2811 + 0.0570 + 0.2747 + 0.0361
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Last Update: 1536 08JUL96 kjl