TABLE 2.

Average differential concentrations of total, biological, and bacterial INPs

Temp of activation (°C)	Total INP concn (mean ± SE) (liter−1 precipitation)a	Biological INP concn (mean ± SE) (liter−1 precipitation)b	% of total INP	Bacterial INP concn (mean ± SE) (liter−1 precipitation)c	% of total INP
−4	2 ± 1	2 ± 1	100	2 ± 1	100
−5	11 ± 6	11 ± 6	100	10 ± 5	91
−6	61 ± 11	60 ± 11	98	35 ± 6	57
−7	174 ± 41	169 ± 41	97	108 ± 31	62
−8	231 ± 64	223 ± 64	97	118 ± 42	51
−9	349 ± 103	332 ± 101	95	160 ± 72	46
−10	520 ± 161	460 ± 155	88	211 ± 54	41
−11	1,030 ± 156	679 ± 121	66	523 ± 119	51
−12	2,700 ± 341	1,530 ± 227	57	941 ± 153	35
−13	5,200 ± 464	2,890 ± 326	56	2,060 ± 277	40
−14	5,650 ± 496	2,800 ± 359	50	2,830 ± 480	50
−15	2,090 ± 190	724 ± 119	35	1,020 ± 218	49
Cumulative INP	16,200 ± 954	9,020 ± 773	56	6,620 ± 660	41

^aTotal INP was as follows: −4 to –12°C, n = 61; –13°C, n = 56; –14°C, n = 48; and –15°C, n = 44.

^bBiological INP was as follows: −4 to –12°C, n = 61; –13°C, n = 56; –14°C, n = 48; and –15°C, n = 44.

^cBacterial INP was as follows: −4 to –12°C, n = 54; –13°C, n = 44; –14°C, n = 37; and –15°C, n = 34.