Effects of climate change on reduction of internal bond strength of particleboard subjected to various climatic conditions in Japan

Table 2 Climatic conditions and IB at outdoor exposure sites from April 2004 to March 2009

Outdoor exposure time (year)	Site no.	Climatic conditions			CDI	IB (MPa)
Outdoor exposure time (year)	Site no.	T (°C)	P (mm)	S (MJ/m²)	CDI	Mean	SD
1	1	7.2	984	11.9	−2.15	0.812	0.07
	2	11.6	1731	10.6	−1.48	0.630	0.10
	3	10.6	1535	12.2	−1.12	0.639	0.09
From April 2004	4	14.5	1693	14.0	0.348	0.605	0.09
to March 2005	5	14.5	1683	12.4	−0.300	0.551	0.10
	6	16.9	1509	14.2	0.716	0.556	0.07
	7	17.4	3454	14.4	2.08	0.337	0.15
	8	16.9	3302	14.4	1.91	0.229	0.04
2	1	7.0	987	11.9	−2.09	0.626	0.05
	2	11.4	1622	10.6	−1.39	0.540	0.16
	3	10.3	1468	12.2	−1.04	0.458	0.11
From April 2004	4	14.2	1409	14.0	0.325	0.573	0.22
to March 2006	5	14.2	1355	12.4	−0.374	0.434	0.14
	6	16.7	1141	14.2	0.632	0.324	0.17
	7	17.0	2624	14.4	1.88	0.212	0.11
	8	16.8	2889	14.4	2.05	0.125	0.07
3	1	7.1	1009	11.8	−2.16	0.666	0.10
	2	11.5	1571	10.8	−1.35	0.464	0.12
	3	10.4	1370	12.3	−1.07	0.521	0.14
From April 2004	4	14.3	1455	13.7	0.274	0.318	0.13
to March 2007	5	14.2	1326	12.5	−0.372	0.323	0.13
	6	16.7	1160	14.3	0.685	0.185	0.11
	7	17.0	2432	14.3	1.84	0.152	0.06
	8	17.0	2688	14.5	2.15	0.092	0.04
4	1	7.1	966	12.0	−2.09	0.596	0.13
	2	11.5	1475	11.2	−1.28	0.287	0.12
	3	10.4	1348	12.3	−1.02	0.480	0.14
From April 2004	4	14.3	1377	13.4	0.219	0.320	0.19
to March 2008	5	14.2	1315	12.0	−0.565	0.186	0.07
	6	16.7	1082	14.0	0.653	0.208	0.12
	7	16.9	2326	14.0	1.84	0.069	0.03
	8	17.0	2569	14.3	2.24	0.057	0.02
5	1	7.2	946	12.0	−2.13	0.360	0.25
	2	11.5	1470	11.3	−1.29	0.377	0.15
From April 2004	3	10.5	1315	12.4	−1.01	0.193	0.11
to March 2009	4	14.3	1399	13.3	0.204	0.140	0.11
	5	14.2	1274	12.2	−0.524	0.119	0.10
	6	16.7	1057	14.0	0.680	0.186	0.08
	7	16.9	2302	14.0	1.85	0.054	0.02
	8	17.0	2566	14.2	2.22	0.056	0.02

Details about the sites are provided in Table 1. Due to a lack of climatic conditions for Site 5 (Maniwa), the conditions for Tsuyama (located near Maniwa) were used. Boldface indicates solar radiation predicted using model that was developed by Kondo [12]
T annual mean temperature, P annual precipitation, S annual solar radiation, CDI climate deterioration index (first principal component score), IB internal bond strength, SD standard deviation