DIANA HERTANTIDATA AND INFORMATION STAFF OF CLIMATOLOGICAL BOGOR STATION

IntroductionBogor 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

BackgroundThis 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 indicesTxx (Max Tmax -Monthly maximum value of

daily maximum temp)year Txx year Txx year Txx year Txx1975 33.4 1985 33.9 1995 34.3 2005 35.41976 35.1 1986 33.2 1996 33.4 2006 35.81977 35.9 1987 35.2 1997 36.6 2007 351978 33.8 1988 34.5 1998 34.2 2008 33.81979 33.8 1989 34.7 1999 34.6 2009 35.41980 33.7 1990 33.8 2000 33.5 2010 34.61981 33.8 1991 35 2001 34.4 2011 34.81982 35.6 1992 33.3 2002 35.51983 34.4 1993 34.2 2003 34.6 Max = 36.61984 33.7 1994 34.9 2004 35 Min = 33.2

Temperature indicesTxn (Min Tmax -Monthly minimum value of

daily maximum temp)year Txn year Txn year Txn year Txn1975 26.8 1985 26.8 1995 24.8 2005 25.41976 25.9 1986 26 1996 24 2006 26.41977 26.5 1987 25.5 1997 25 2007 24.81978 26.4 1988 25.1 1998 27.4 2008 24.61979 26 1989 25.6 1999 25.6 2009 24.71980 25.5 1990 27.4 2000 25.9 2010 26.61981 25.5 1991 25.7 2001 24.3 2011 26.21982 24.6 1992 26.7 2002 25.61983 26.3 1993 25.3 2003 26 Max = 27.41984 25.2 1994 24.8 2004 27.3 Min = 24

Temperature indicesTnx (Max Tmin -Monthly maximum value of

daily minimum temp) year Tnx year Tnx year Tnx year Tnx1975 23.2 1985 24.6 1995 24.2 2005 25.21976 23.2 1986 24.2 1996 24.2 2006 24.71977 24 1987 24.3 1997 24.4 2007 24.41978 25.4 1988 24.4 1998 25.3 2008 23.91979 23.8 1989 23.8 1999 24.8 2009 251980 23.5 1990 24.5 2000 24.6 2010 25.21981 23.9 1991 24.4 2001 24.6 2011 251982 23.8 1992 24.7 2002 25.61983 24.4 1993 24.7 2003 24.8 Max = 25.61984 23.7 1994 24.8 2004 25 Min = 23.2

Temperature indicesTnn (Min Tmin -Monthly minimum value of

daily minimum temp)year Tnn year Tnn year Tnn year Tnn1975 18.4 1985 18.3 1995 20.1 2005 20.41976 17.4 1986 17.8 1996 19 2006 18.51977 17 1987 18.6 1997 17.9 2007 19.11978 18.5 1988 18.7 1998 19.2 2008 191979 16.4 1989 19 1999 18.4 2009 18.41980 18.4 1990 18.6 2000 19.5 2010 19.81981 18.6 1991 17.5 2001 18.4 2011 19.61982 16.8 1992 19.1 2002 191983 18 1993 20 2003 19.1 Max = 20.41984 17.6 1994 17.6 2004 18.6 Min = 16.4

Temperature indicesTx10p (Cool nights -Percentage of days when

TN<10th percentile)year Tx10p year Tx10p year Tx10p year Tx10p1975 12.05 1985 22.33 1995 10.73 2005 2.791976 6.46 1986 20.33 1996 17.9 2006 4.721977 5.48 1987 8.59 1997 4.08 2007 7.081978 14.7 1988 12.92 1998 14.84 2008 14.521979 11.72 1989 20.92 1999 13.08 2009 5.571980 12.58 1990 14.95 2000 12.92 2010 8.671981 18.94 1991 10.64 2001 14.81 2011 4.661982 8.79 1992 17.17 2002 6.71983 8.27 1993 12.52 2003 5.72 Max = 25.971984 25.97 1994 8.09 2004 2.81 Min = 2.79

Temperature indicesTx90p (Warm days- Percentage of days when

TX>90th percentile)year Tx90p year Tx90p year Tx90p year Tx90p1975 3.84 1985 3.85 1995 6.07 2005 38.161976 37.86 1986 1.59 1996 1.9 2006 24.681977 28.81 1987 7.31 1997 19.67 2007 10.841978 15.68 1988 6.6 1998 15.39 2008 8.681979 4.74 1989 3.12 1999 4.68 2009 20.831980 4.88 1990 2.84 2000 2.52 2010 25.211981 1.61 1991 10.29 2001 4.15 2011 16.161982 11.9 1992 0.94 2002 11.031983 13.68 1993 2.81 2003 13.39 Max = 38.161984 1.27 1994 8.71 2004 21.13 Min = 0.94

Temperature indicesTn10p (Cool nights-Percentage of days when

TN<10th percentile)year Tn10p year Tn10p year Tn10p year Tn10p1975 35.62 1985 15.52 1995 0.64 2005 0.241976 54.85 1986 10.54 1996 4.7 2006 5.681977 27.99 1987 6.4 1997 15 2007 2.811978 17.61 1988 8.58 1998 0.64 2008 10.981979 20.45 1989 9.69 1999 5.47 2009 6.611980 22.8 1990 13.9 2000 1.93 2010 0.861981 20.19 1991 7 2001 4.02 2011 2.471982 34.27 1992 2.99 2002 2.521983 11.41 1993 2.68 2003 5.06 Max = 54.851984 24.93 1994 18.09 2004 3.14 Min = 0.24

Temperature indicesTn90p(Warm nights- Percentage of days

when TN>90th percentile)year Tn90p year Tn90p year Tn90p year Tn90p1975 0.27 1985 2.53 1995 10.77 2005 42.951976 0 1986 3.21 1996 8.44 2006 14.791977 1.19 1987 3.21 1997 5.21 2007 9.91978 3.83 1988 5.86 1998 46.5 2008 6.941979 1.16 1989 2.18 1999 9.56 2009 17.091980 0.62 1990 11.41 2000 24.19 2010 41.261981 1.25 1991 10.29 2001 16.93 2011 12.051982 0.55 1992 7.69 2002 22.481983 4.41 1993 9.43 2003 14.27 Max = 46.51984 0.64 1994 6.57 2004 20.26 Min = 0

Temperature indicesWsdi (Warm spell duration indicator - Annual

count of days with at least 6 consecutive days when TX>90th percentile

year wsdi year wsdi year wsdi year wsdi1975 0 1985 0 1995 0 2005 61976 42 1986 0 1996 0 2006 01977 21 1987 0 1997 9 2007 61978 12 1988 0 1998 0 2008 01979 0 1989 0 1999 0 2009 71980 0 1990 0 2000 0 2010 181981 0 1991 0 2001 0 2011 01982 8 1992 0 2002 61983 0 1993 0 2003 6 Max = 421984 0 1994 0 2004 7 Min = 0

Temperature indicesCsdi (Cold spell duration indicator-Annual

count of days with at least 6 consecutive days when TN<10th percentile)

year csdi year csdi year csdi year csdi1975 6 1985 0 1995 0 2005 01976 42 1986 0 1996 0 2006 01977 6 1987 0 1997 0 2007 01978 0 1988 0 1998 0 2008 01979 14 1989 0 1999 0 2009 01980 6 1990 0 2000 0 2010 01981 0 1991 0 2001 0 2011 01982 12 1992 0 2002 01983 0 1993 0 2003 0 Max = 421984 0 1994 10 2004 0

Temperature indicesDtr(Diurnal temperature range-Monthly

mean difference between TX and TN)year dtr year dtr year dtr year dtr1975 10.03 1985 9.1 1995 8.6 2005 9.031976 11.03 1986 8.77 1996 8.37 2006 9.551977 10.61 1987 9.08 1997 9.92 2007 9.231978 9.51 1988 9.02 1998 8.21 2008 9.111979 9.46 1989 8.81 1999 8.58 2009 9.331980 9.43 1990 9.11 2000 8.22 2010 8.561981 9.03 1991 9.02 2001 8.44 2011 9.191982 10.05 1992 8.46 2002 8.821983 9.54 1993 8.69 2003 9.22 Max = 11.031984 8.91 1994 9.61 2004 9.28 Min = 8.21

Precipitation indicesRx1day (Max 1-day precipitation amount-

Monthly maximum 1-day precipitation)year Rx1day year Rx1day year Rx1day year Rx1day1975 179 1985 105 1995 87.6 2005 87.71976 181 1986 110 1996 174 2006 136.41977 84 1987 88 1997 113.5 2007 155.51978 149 1988 89 1998 127.1 2008 104.51979 137 1989 240 1999 149.6 2009 115.11980 144 1990 188.3 2000 93.8 2010 144.51981 146 1991 105 2001 107.5 2011 97.61982 111 1992 112.2 2002 1271983 90 1993 176.3 2003 123.3 Max = 2401984 114 1994 100 2004 141.6 Min = 84

Precipitation indicesRx5day (Max 5-day precipitation amount-

Monthly maximum consecutive 5-day precipitation)year Rx5day year Rx5day year Rx5day year Rx5day

1975 243 1985 188 1995 248.8 2005 155.31976 203 1986 222 1996 287.3 2006 312.31977 248 1987 178 1997 251.9 2007 254.31978 232 1988 195 1998 241.2 2008 2741979 212 1989 292.1 1999 301.5 2009 234.41980 259 1990 372.4 2000 200 2010 271.81981 262 1991 235.7 2001 180.6 2011 205.21982 248 1992 212.6 2002 417.21983 283 1993 234.1 2003 239.4 Max = 417.21984 231 1994 271.7 2004 213.7 Min = 155.3

Precipitation indicesSdii (Simple daily intensity index- Annual

total precipitation divided by the number of wet days (defined as PRCP>=1.0mm) in the year)year sdii year sdii year sdii year sdii

1975 17.9 1985 17.8 1995 21.2 2005 17.21976 17.8 1986 19.9 1996 23.8 2006 18.21977 20.1 1987 16.6 1997 17.8 2007 18.71978 19.2 1988 16.5 1998 20.3 2008 22.31979 20.3 1989 21.4 1999 16.9 2009 19.81980 19.8 1990 20.4 2000 17.9 2010 17.41981 17.8 1991 20.3 2001 19.4 2011 17.11982 19.9 1992 21.5 2002 22.91983 16.8 1993 20.1 2003 20.8 Max = 23.81984 18.3 1994 22.9 2004 21.7 Min = 16.5

Precipitation indicesR10mm (Number of heavy precipitation days-

Annual count of days when PRCP>=10mm)year R10mm year R10mm year R10mm year R10mm1975 117 1985 93 1995 110 2005 781976 96 1986 129 1996 119 2006 791977 121 1987 100 1997 79 2007 1021978 138 1988 90 1998 117 2008 1211979 102 1989 97 1999 87 2009 981980 111 1990 108 2000 85 2010 1201981 101 1991 90 2001 100 2011 821982 92 1992 120 2002 1061983 96 1993 125 2003 105 Max = 1381984 120 1994 106 2004 110 Min = 78

Precipitation indicesR20mm (Number of very heavy precipitation

days- Annual count of days when PRCP>=20mm)year R20mm year R20mm year R20mm year R20mm

1975 77 1985 63 1995 82 2005 451976 65 1986 71 1996 76 2006 541977 81 1987 65 1997 46 2007 651978 90 1988 53 1998 70 2008 841979 71 1989 66 1999 53 2009 691980 81 1990 70 2000 55 2010 651981 75 1991 57 2001 62 2011 461982 62 1992 82 2002 811983 52 1993 79 2003 74 Max = 901984 65 1994 74 2004 68 Min = 45

Precipitation indicesR25mm (Number of very heavy precipitation

days- Annual count of days when PRCP>=25mm)year R25mm year R25mm year R25mm year R25mm1975 64 1985 50 1995 67 2005 321976 53 1986 59 1996 65 2006 421977 72 1987 53 1997 39 2007 531978 64 1988 45 1998 57 2008 721979 59 1989 55 1999 43 2009 581980 67 1990 60 2000 48 2010 481981 59 1991 47 2001 50 2011 371982 54 1992 70 2002 651983 42 1993 68 2003 58 Max = 721984 48 1994 63 2004 61 Min = 32

Precipitation indicesCdd (Consecutive dry days- Maximum

number of consecutive days with RR<1mm)year cdd year cdd year cdd year cdd1975 6 1985 9 1995 10 2005 131976 18 1986 10 1996 7 2006 191977 14 1987 18 1997 27 2007 151978 7 1988 12 1998 11 2008 101979 13 1989 10 1999 12 2009 221980 10 1990 13 2000 12 2010 61981 5 1991 23 2001 11 2011 91982 24 1992 11 2002 121983 20 1993 11 2003 20 Max = 331984 12 1994 33 2004 21 Min = 5

Precipitation indicesCwd (Consecutive wet days- Maximum

number of consecutive days with RR>=1mm)year cwd year cwd year cwd year cwd1975 19 1985 12 1995 14 2005 131976 30 1986 19 1996 13 2006 111977 20 1987 22 1997 15 2007 151978 12 1988 11 1998 16 2008 211979 8 1989 20 1999 11 2009 91980 13 1990 14 2000 16 2010 171981 15 1991 11 2001 13 2011 71982 16 1992 15 2002 201983 21 1993 18 2003 11 Max = 301984 11 1994 24 2004 13 Min = 7

Precipitation indicesR95p (Very wet days- Annual total PRCP

when RR>95th percentile)year r95p year r95p year r95p year r95p1975 736 1985 684 1995 776.7 2005 172.81976 689 1986 978 1996 1983.2 2006 640.41977 776 1987 543 1997 525.1 2007 857.91978 764 1988 615 1998 1183.1 2008 9981979 929 1989 1110 1999 757 2009 607.31980 885 1990 1229 2000 611.5 2010 1011.81981 693 1991 736.6 2001 982.6 2011 538.31982 940 1992 852.9 2002 1107.81983 627 1993 497.9 2003 793.5 Max = 1983.21984 1128 1994 979.6 2004 1116.9 Min = 172.8

Precipitation indicesR99p (Extremely wet days- Annual total

PRCP when RR>99th percentile)year r99p year r99p year r99p year r99p1975 179 1985 208 1995 0 2005 01976 181 1986 424 1996 536 2006 247.11977 0 1987 0 1997 113.5 2007 384.81978 478 1988 0 1998 326 2008 311.21979 472 1989 465.9 1999 248 2009 115.11980 507 1990 426.5 2000 0 2010 345.61981 385 1991 202.5 2001 107.5 2011 97.61982 111 1992 223.4 2002 2531983 0 1993 176.3 2003 224.8 Max = 576.91984 220 1994 100 2004 576.9 Min = 0

Precipitation indicesPrcptot (Annual total wet-day precipitation-

Annual total PRCP in wet days (RR>=1mm))year prcptot year prcptot year prcptot year prcptot1975 4304 1985 3596 1995 4217.2 2005 23801976 3447 1986 4234 1996 4870 2006 2981.81977 4343 1987 3420 1997 2840.5 2007 3766.71978 4671 1988 3187 1998 4375.2 2008 4720.41979 3921 1989 4063.5 1999 3240.2 2009 3485.81980 4330 1990 4443.2 2000 3287.8 2010 4038.41981 4068 1991 3267.2 2001 3668.9 2011 28291982 3643 1992 4549.6 2002 4327.61983 3217 1993 4262.9 2003 3880.4 Max = 48701984 4084 1994 4092.6 2004 4212.6 Min = 2380

Trend Table of Darmaga’s DataIndices SYear EYear Slope STD_of_Slope P_Value

txx 1975 2011 0.022 0.012 0.09txn 1975 2011 -0.013 0.013 0.333tnx 1975 2011 0.034 0.007 0tnn 1975 2011 0.05 0.011 0

tx10p 1975 2011 -0.205 0.083 0.019tx90p 1975 2011 0.2 0.152 0.198tn10p 1975 2011 -0.824 0.124 0tn90p 1975 2011 0.721 0.138 0wsdi 1975 2011 -0.123 0.128 0.343csdi 1975 2011 -0.312 0.106 0.006dtr 1975 2011 -0.026 0.009 0.004

rx1day 1975 2011 -0.66 0.581 0.264rx5day 1975 2011 0.739 0.86 0.396

sdii 1975 2011 0.012 0.032 0.708r10mm 1975 2011 -0.486 0.241 0.053r20mm 1975 2011 -0.384 0.18 0.041R25mm 1975 2011 -0.321 0.161 0.056

cdd 1975 2011 0.088 0.099 0.38cwd 1975 2011 -0.125 0.078 0.118r95p 1975 2011 -0.836 5.058 0.87r99p 1975 2011 -1.852 2.921 0.53

prcptot 1975 2011 -16.772 9.583 0.09

ConclusionAs 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.