Climate indice in West Java
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DIANA HERTANTI DATA AND INFORMATION STAFF OF CLIMATOLOGICAL BOGOR STATION Introduction Bogor is located approximately 65 km south of Jakarta. Mostly of Bogor region is a non-zone seasons. That means there is no clear boundary between the dry season and rainy season. Bogor Climatological Station is located around 65 km south Jakarta, at 106.45 E and 06.33 S and located at an altitude of 207 meters above the sea level Bogor Climatological Station founded in 1959 as rainfall post Background This research is to find determine how many changes that occurred at climate indices and determined its trend This research using precipitation and max min temperature data of Bogor climatology station since 1975 until 2011 Those data runs on Rclimdex 1.0.0 Temperature indices Txx (Max Tmax -Monthly maximum value of daily maximum temp) year 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 Txx 33.4 35.1 35.9 33.8 33.8 33.7 33.8 35.6 34.4 33.7 year 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 Txx 33.9 33.2 35.2 34.5 34.7 33.8 35 33.3 34.2 34.9 year 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 Txx 34.3 33.4 36.6 34.2 34.6 33.5 34.4 35.5 34.6 35 year 2005 2006 2007 2008 2009 2010 2011 Txx 35.4 35.8 35 33.8 35.4 34.6 34.8 Max = Min = 36.6 33.2 Temperature indices Txn (Min Tmax -Monthly minimum value of daily maximum temp) year 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 Txn 26.8 25.9 26.5 26.4 26 25.5 25.5 24.6 26.3 25.2 year 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 Txn 26.8 26 25.5 25.1 25.6 27.4 25.7 26.7 25.3 24.8 year 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 Txn 24.8 24 25 27.4 25.6 25.9 24.3 25.6 26 27.3 year Txn 2005 2006 2007 2008 2009 2010 2011 Max = Min = 25.4 26.4 24.8 24.6 24.7 26.6 26.2 27.4 24 Temperature indices Tnx (Max Tmin -Monthly maximum value of daily minimum temp) year 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 Tnx 23.2 23.2 24 25.4 23.8 23.5 23.9 23.8 24.4 23.7 year 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 Tnx 24.6 24.2 24.3 24.4 23.8 24.5 24.4 24.7 24.7 24.8 year 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 Tnx 24.2 24.2 24.4 25.3 24.8 24.6 24.6 25.6 24.8 25 year 2005 2006 2007 2008 2009 2010 2011 Tnx 25.2 24.7 24.4 23.9 25 25.2 25 Max = Min = 25.6 23.2 Temperature indices Tnn (Min Tmin -Monthly minimum value of daily minimum temp) year 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 Tnn 18.4 17.4 17 18.5 16.4 18.4 18.6 16.8 18 17.6 year 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 Tnn 18.3 17.8 18.6 18.7 19 18.6 17.5 19.1 20 17.6 year 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 Tnn 20.1 19 17.9 19.2 18.4 19.5 18.4 19 19.1 18.6 year 2005 2006 2007 2008 2009 2010 2011 Tnn 20.4 18.5 19.1 19 18.4 19.8 19.6 Max = Min = 20.4 16.4 Temperature indices Tx10p (Cool nights -Percentage of days when TN<10th percentile) year 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 Tx10p 12.05 6.46 5.48 14.7 11.72 12.58 18.94 8.79 8.27 25.97 year 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 Tx10p 22.33 20.33 8.59 12.92 20.92 14.95 10.64 17.17 12.52 8.09 year 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 Tx10p 10.73 17.9 4.08 14.84 13.08 12.92 14.81 6.7 5.72 2.81 year 2005 2006 2007 2008 2009 2010 2011 Tx10p 2.79 4.72 7.08 14.52 5.57 8.67 4.66 Max = Min = 25.97 2.79 Temperature indices Tx90p (Warm days- Percentage of days when TX>90th percentile) year 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 Tx90p 3.84 37.86 28.81 15.68 4.74 4.88 1.61 11.9 13.68 1.27 year 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 Tx90p 3.85 1.59 7.31 6.6 3.12 2.84 10.29 0.94 2.81 8.71 year 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 Tx90p 6.07 1.9 19.67 15.39 4.68 2.52 4.15 11.03 13.39 21.13 year 2005 2006 2007 2008 2009 2010 2011 Tx90p 38.16 24.68 10.84 8.68 20.83 25.21 16.16 Max = Min = 38.16 0.94 Temperature indices Tn10p (Cool nights-Percentage of days when TN<10th percentile) year 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 Tn10p 35.62 54.85 27.99 17.61 20.45 22.8 20.19 34.27 11.41 24.93 year 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 Tn10p 15.52 10.54 6.4 8.58 9.69 13.9 7 2.99 2.68 18.09 year 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 Tn10p 0.64 4.7 15 0.64 5.47 1.93 4.02 2.52 5.06 3.14 year 2005 2006 2007 2008 2009 2010 2011 Tn10p 0.24 5.68 2.81 10.98 6.61 0.86 2.47 Max = Min = 54.85 0.24 Temperature indices Tn90p(Warm nights- Percentage of days when TN>90th percentile) year 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 Tn90p 0.27 0 1.19 3.83 1.16 0.62 1.25 0.55 4.41 0.64 year 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 Tn90p 2.53 3.21 3.21 5.86 2.18 11.41 10.29 7.69 9.43 6.57 year 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 Tn90p 10.77 8.44 5.21 46.5 9.56 24.19 16.93 22.48 14.27 20.26 year 2005 2006 2007 2008 2009 2010 2011 Tn90p 42.95 14.79 9.9 6.94 17.09 41.26 12.05 Max = Min = 46.5 0 Temperature indices Wsdi (Warm spell duration indicator - Annual count of days with at least 6 consecutive days when TX>90th percentile year 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 wsdi 0 42 21 12 0 0 0 8 0 0 year 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 wsdi 0 0 0 0 0 0 0 0 0 0 year 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 wsdi 0 0 9 0 0 0 0 6 6 7 year 2005 2006 2007 2008 2009 2010 2011 wsdi 6 0 6 0 7 18 0 Max = Min = 42 0 Temperature indices Csdi (Cold spell duration indicator-Annual count of days with at least 6 consecutive days when TN<10th percentile) year 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 csdi 6 42 6 0 14 6 0 12 0 0 year 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 csdi 0 0 0 0 0 0 0 0 0 10 year 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 csdi 0 0 0 0 0 0 0 0 0 0 year 2005 2006 2007 2008 2009 2010 2011 csdi 0 0 0 0 0 0 0 Max = 42 Temperature indices Dtr(Diurnal temperature range-Monthly mean difference between TX and TN) year 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 dtr 10.03 11.03 10.61 9.51 9.46 9.43 9.03 10.05 9.54 8.91 year 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 dtr 9.1 8.77 9.08 9.02 8.81 9.11 9.02 8.46 8.69 9.61 year 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 dtr 8.6 8.37 9.92 8.21 8.58 8.22 8.44 8.82 9.22 9.28 year 2005 2006 2007 2008 2009 2010 2011 dtr 9.03 9.55 9.23 9.11 9.33 8.56 9.19 Max = Min = 11.03 8.21 Precipitation indices Rx1day (Max 1-day precipitation amount- Monthly maximum 1-day precipitation) year 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 Rx1day 179 181 84 149 137 144 146 111 90 114 year 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 Rx1day 105 110 88 89 240 188.3 105 112.2 176.3 100 year 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 Rx1day 87.6 174 113.5 127.1 149.6 93.8 107.5 127 123.3 141.6 year 2005 2006 2007 2008 2009 2010 2011 Rx1day 87.7 136.4 155.5 104.5 115.1 144.5 97.6 Max = Min = 240 84 Precipitation indices Rx5day (Max 5-day precipitation amount- Monthly maximum consecutive 5-day precipitation) year 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 Rx5day 243 203 248 232 212 259 262 248 283 231 year 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 Rx5day 188 222 178 195 292.1 372.4 235.7 212.6 234.1 271.7 year 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 Rx5day 248.8 287.3 251.9 241.2 301.5 200 180.6 417.2 239.4 213.7 year 2005 2006 2007 2008 2009 2010 2011 Rx5day 155.3 312.3 254.3 274 234.4 271.8 205.2 Max = Min = 417.2 155.3 Precipitation indices Sdii (Simple daily intensity index- Annual total precipitation divided by the number of wet days (defined as PRCP>=1.0mm) in the year) year 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 sdii 17.9 17.8 20.1 19.2 20.3 19.8 17.8 19.9 16.8 18.3 year 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 sdii 17.8 19.9 16.6 16.5 21.4 20.4 20.3 21.5 20.1 22.9 year 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 sdii 21.2 23.8 17.8 20.3 16.9 17.9 19.4 22.9 20.8 21.7 year 2005 2006 2007 2008 2009 2010 2011 sdii 17.2 18.2 18.7 22.3 19.8 17.4 17.1 Max = Min = 23.8 16.5 Precipitation indices R10mm (Number of heavy precipitation days-Annual count of days when PRCP>=10mm) year 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 R10mm 117 96 121 138 102 111 101 92 96 120 year 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 R10mm 93 129 100 90 97 108 90 120 125 106 year 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 R10mm 110 119 79 117 87 85 100 106 105 110 year 2005 2006 2007 2008 2009 2010 2011 R10mm 78 79 102 121 98 120 82 Max = Min = 138 78 Precipitation indices R20mm (Number of very heavy precipitation days- Annual count of days when PRCP>=20mm) year 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 R20mm 77 65 81 90 71 81 75 62 52 65 year 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 R20mm 63 71 65 53 66 70 57 82 79 74 year 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 R20mm 82 76 46 70 53 55 62 81 74 68 year 2005 2006 2007 2008 2009 2010 2011 R20mm 45 54 65 84 69 65 46 Max = Min = 90 45 Precipitation indices R25mm (Number of very heavy precipitation days- Annual count of days when PRCP>=25mm) year 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 R25mm 64 53 72 64 59 67 59 54 42 48 year 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 R25mm 50 59 53 45 55 60 47 70 68 63 year 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 R25mm 67 65 39 57 43 48 50 65 58 61 year 2005 2006 2007 2008 2009 2010 2011 R25mm 32 42 53 72 58 48 37 Max = Min = 72 32 Precipitation indices Cdd (Consecutive dry days- Maximum number of consecutive days with RR<1mm) year 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 cdd 6 18 14 7 13 10 5 24 20 12 year 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 cdd 9 10 18 12 10 13 23 11 11 33 year 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 cdd 10 7 27 11 12 12 11 12 20 21 year 2005 2006 2007 2008 2009 2010 2011 cdd 13 19 15 10 22 6 9 Max = Min = 33 5 Precipitation indices Cwd (Consecutive wet days- Maximum number of consecutive days with RR>=1mm) year 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 cwd 19 30 20 12 8 13 15 16 21 11 year 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 cwd 12 19 22 11 20 14 11 15 18 24 year 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 cwd 14 13 15 16 11 16 13 20 11 13 year 2005 2006 2007 2008 2009 2010 2011 cwd 13 11 15 21 9 17 7 Max = Min = 30 7 Precipitation indices R95p (Very wet days- Annual total PRCP when RR>95th percentile) year 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 r95p 736 689 776 764 929 885 693 940 627 1128 year 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 r95p 684 978 543 615 1110 1229 736.6 852.9 497.9 979.6 year 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 r95p 776.7 1983.2 525.1 1183.1 757 611.5 982.6 1107.8 793.5 1116.9 year 2005 2006 2007 2008 2009 2010 2011 r95p 172.8 640.4 857.9 998 607.3 1011.8 538.3 Max = Min = 1983.2 172.8 Precipitation indices R99p (Extremely wet days- Annual total PRCP when RR>99th percentile) year 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 r99p 179 181 0 478 472 507 385 111 0 220 year 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 r99p 208 424 0 0 465.9 426.5 202.5 223.4 176.3 100 year 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 r99p 0 536 113.5 326 248 0 107.5 253 224.8 576.9 year 2005 2006 2007 2008 2009 2010 2011 r99p 0 247.1 384.8 311.2 115.1 345.6 97.6 Max = Min = 576.9 0 Precipitation indices Prcptot (Annual total wet-day precipitation- Annual total PRCP in wet days (RR>=1mm)) year 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 prcptot 4304 3447 4343 4671 3921 4330 4068 3643 3217 4084 year 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 prcptot 3596 4234 3420 3187 4063.5 4443.2 3267.2 4549.6 4262.9 4092.6 year 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 prcptot 4217.2 4870 2840.5 4375.2 3240.2 3287.8 3668.9 4327.6 3880.4 4212.6 year 2005 2006 2007 2008 2009 2010 2011 prcptot 2380 2981.8 3766.7 4720.4 3485.8 4038.4 2829 Max = Min = 4870 2380 Trend Table of Darmaga’s Data Indices SYear EYear Slope STD_of_Slope P_Value txx 1975 2011 0.022 0.012 0.09 txn 1975 2011 -0.013 0.013 0.333 tnx 1975 2011 0.034 0.007 0 tnn 1975 2011 0.05 0.011 0 tx10p 1975 2011 -0.205 0.083 0.019 tx90p 1975 2011 0.2 0.152 0.198 tn10p 1975 2011 -0.824 0.124 0 tn90p 1975 2011 0.721 0.138 0 wsdi 1975 2011 -0.123 0.128 0.343 csdi 1975 2011 -0.312 0.106 0.006 dtr 1975 2011 -0.026 0.009 0.004 rx1day 1975 2011 -0.66 0.581 0.264 rx5day 1975 2011 0.739 0.86 0.396 sdii 1975 2011 0.012 0.032 0.708 r10mm 1975 2011 -0.486 0.241 0.053 r20mm 1975 2011 -0.384 0.18 0.041 R25mm 1975 2011 -0.321 0.161 0.056 cdd 1975 2011 0.088 0.099 0.38 cwd 1975 2011 -0.125 0.078 0.118 r95p 1975 2011 -0.836 5.058 0.87 r99p 1975 2011 -1.852 2.921 0.53 prcptot 1975 2011 -16.772 9.583 0.09 Conclusion As non seasonal zone, Bogor (represented by Bogor Climatology Station’s data) has significant changing only on several indices (tnx, tnn, tx10p, tn10p, tn90p, csdi, dtr, r20mm) that has p-value < 0.05 with varied slope value And for the other data, has not significant changing with varied slope value.
