186SL0761112114801 376A 19540101 19921231 2427N 11804E 2 00000R 0000 MM 186SL0761212114801 Xiamen China PRC Nat. Ocean. Data Center 186SL076130001 186SL076130002 QUALITY ASSESSMENT OF SEA LEVEL DATA 186SL076130003 by the 186SL076130004 TOGA SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER 186SL076130005 JOINT ARCHIVE FOR SEA LEVEL 186SL076130006 186SL076130007Station : Xiamen Latitude: 24 27.0N 186SL076130008Country : China Longitude: 118 04.0E 186SL076130009JASL # : 376A Time Meridian: 120E (GMT + 8 hr) 186SL076130010GLOSS # : 247 TOGA #: P001 NODC #: 12114801 186SL076130011Contributor : PRC National Oceanographic Data Center 186SL076130012 118, Qiwei Road, Hedong 186SL076130013 District Tianjin, China 186SL076130014Originator : same 186SL076130015Original Data: analog 186SL076130016Instrmnt Type: Gauge rods (1954-1964); HCJ1, float gauge (1965+) 186SL076130017Digitzd Intvl: hourly 186SL076130018Present Data : Hourly, daily, and monthly values obtained by: 186SL076130019 Hourly : originally hourly 186SL076130020 Daily : 119-point convolution filter (Bloomfield, 1976) 186SL076130021 centered on noon applied to the hourly data 186SL076130022 with respective periods of the 95, 50, and 5% 186SL076130023 amplitude points at 124.0, 60.2, and 40.2 hours 186SL076130024 Monthly: Simple average of all daily values; calculated if 186SL076130025 7 or fewer days are missing 186SL076130026Span of data : 01 Jan 1954 - 31 Dec 1992 186SL076130027Gaps > 1 mon : 31 Dec 1987 - 31 Jan 1988 186SL076130028Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 186SL076130029Units : millimeters Missing Data Flag :99999 186SL076130030Refernce Levl: The sea level heights are referred to the Tide 186SL076130031 Gauge Zero (TGZ) of January 1976, which is 8.788m 186SL076130032 below TGBM-72831. For the original hourly data, 186SL076130033 380 cm was added for the period 1/Jan/1954- 186SL076130034 (07Z)11/Nov/1957. Bench mark information is 186SL076130035 available upon request from the contributors. 186SL076130036Comment : The residual series are very noisy which are 186SL076130037 probably due to shallow water tides that are not 186SL076130038 resolved by the harmonic analysis. Also the daily 186SL076130039 plot shows noise due to a great amount of energy 186SL076130040 with periods from 1 to 5 days. The monthly plot 186SL076130041 reveals a consistent annual and semi-annual 186SL076130042 harmonic and the 12-month running mean is 186SL076130043 steady. This data set is of good quality. 186SL076130044 186SL076130045 CI MISSING REPLACED GAPS QUESTIONABLE 186SL076130046YEAR (%) DATA OR BAD DATA FLUCTUATIONS 186SL076130047---- --- -------------------- --------------- -------------------- 186SL0761300481954 100 none none see comment above 186SL0761300491955 100 none none see comment above 186SL0761300501956 100 none none see comment above 186SL0761300511957 100 none none see comment above 186SL0761300521958 100 none none see comment above 186SL0761300531959 100 none none see comment above 186SL0761300541960 100 none none see comment above 186SL0761300551961 100 none none see comment above 186SL0761300561962 100 none none see comment above 186SL0761300571963 100 none none see comment above 186SL0761300581964 100 none none see comment above 186SL0761300591965 100 none none see comment above 186SL0761300601966 100 none none see comment above 186SL0761300611967 100 none none see comment above 186SL0761300621968 100 none none see comment above 186SL0761300631969 100 none none see comment above 186SL0761300641970 100 none none see comment above 186SL0761300651971 100 none none see comment above 186SL0761300661972 100 none none see comment above 186SL0761300671973 100 none none see comment above 186SL0761300681974 100 none none see comment above 186SL0761300691975 100 none none see comment above 186SL0761300701976 100 none none see comment above 186SL0761300711977 100 none none see comment above 186SL0761300721978 100 none none see comment above 186SL0761300731979 100 none (16)044-(22)044 see comment above 186SL0761300741980 100 none none see comment above 186SL0761300751981 100 none none see comment above 186SL0761300761982 100 none none see comment above 186SL0761300771983 100 none (15)283-(22)283 see comment above 186SL0761300781984 100 none none see comment above 186SL0761300791985 100 none none see comment above 186SL0761300801986 100 none none see comment above 186SL0761300811987 99 365 none see comment above 186SL0761300821988 92 1-31 none see comment above 186SL0761300831989 100 none none see comment above 186SL0761300841990 100 none none see comment above 186SL0761300851991 100 none none see comment above 186SL0761300861992 99 366 none see comment above 186SL076130087 186SL076130088 QUALITY ASSESSMENT POLICY 186SL076130089 186SL076130090 The quality assessment is mostly based on the residuals 186SL076130091 (observed data minus predicted tides) of the hourly data. This 186SL076130092 assessment also applies to the daily and monthly data since 186SL076130093 they were derived from the quality-controlled hourly data. 186SL076130094 186SL076130095 The following abbreviations are used in the assessment: 186SL076130096 JASL - Joint Archive for Sea Level; GLOSS - Global Sea Level 186SL076130097 Observing System; TOGA - Tropical Ocean Global Atmosphere 186SL076130098 research program; NODC - National Oceanographic Data Center; 186SL076130099 Instrmnt - instrument; Digitzd Intvl - digitized interval; 186SL076130100 Gaps > 1 mon - missing data in a span greater than one month; 186SL076130101 Refernce - reference. 186SL076130102 186SL076130103 The following corrections are made to the hourly data 186SL076130104 prior to this assessment: 186SL076130105 1) Gaps or obviously wrong data points in a span less than 186SL076130106 25 hours are filled by the predicted tide method*. 186SL076130107 2) Timing errors of exact increments of an hour are corrected 186SL076130108 by shifting the data. 186SL076130109 3) Reference level shifts are only corrected after information 186SL076130110 from tide staff readings or comparative readings with a fixed 186SL076130111 bench mark are checked to verify that the shift was not a 186SL076130112 natural event. If comparative readings are missing or 186SL076130113 incomplete, comparisons of the data with nearby stations 186SL076130114 may warrant the adjustment of some obvious shifts. 186SL076130115 4) Data with unresolved datum shifts are not disseminated. 186SL076130116 However, if sufficient time spans of data are available before 186SL076130117 or after the year(s) with the unresolved shift(s), a subset of 186SL076130118 quality assured data is made available. Thus, the Span field 186SL076130119 in the Quality Assessment may not match the span of the 186SL076130120 distribution data set. As the questionable datum shifts are 186SL076130121 resolved, the data set will be updated. Although this policy 186SL076130122 adds some complexity, it allows more rapid dissemination of 186SL076130123 at least the quality assured years. 186SL076130124 186SL076130125 For each year, the following information is documented from 186SL076130126 the quality-controlled hourly data with dates given as the nth 186SL076130127 day of the year starting from 1 January: 186SL076130128 1) a Completeness Index (CI) based on the percentage of hours 186SL076130129 with available data, 186SL076130130 2) a list of gaps longer than a day, 186SL076130131 3) a summary of days with consecutive missing or obviously 186SL076130132 wrong data in a time span longer than 6 but less than 25 186SL076130133 hours that have been replaced, with hours in parentheses, and 186SL076130134 4) a summary of days with questionable fluctuations in the 186SL076130135 residual series. Fluctuations within the residuals are 186SL076130136 considered significant and are noted if they are greater than 186SL076130137 25 cm. This policy has changed slightly as of October 1992: 186SL076130138 only suspicious fluctuations due to obvious instrumentation 186SL076130139 problems are noted. Minor timing drifts are no longer 186SL076130140 included in the list of questionable days. 186SL076130141 186SL076130142 Note : If the predicted tides poorly model the observed heights 186SL076130143 due to the inability of the tidal analysis to completely resolv 186SL076130144 the non-linear shallow water effects, the residuals are not 186SL076130145 suitable for assessing the data quality. Instead, a subjective 186SL076130146 comment on the quality of the data is provided. 186SL076130147 186SL076130148 *The predicted tides are obtained with the use of a harmonic 186SL076130149 analysis program (Foreman, 1977) which is executed on a year 186SL076130150 of apparently good data for a given station. The Predicted 186SL076130151 Tide Method for filling gaps consists of statistically 186SL076130152 comparing the predicted tides to the observed data and 186SL076130153 shifting the predicted tides in time to correct for timing 186SL076130154 differences. Then the linear interpolation between hourly 186SL076130155 values at the end points of the gap in the residual series is 186SL076130156 added to the corresponding corrected predicted tide data to 186SL076130157 obtain interpolated values over the span of the gap. 186SL076130158 186SL076130159 Bloomfield, P., 1976. Fourier Analysis of Time Series: An 186SL076130160 Introduction. New York: John Wiley and Sons. pp 129-137. 186SL076130161 186SL076130162 Foreman, M., 1977. Manual For Tidal Height Analysis and 186SL076130163 Prediction. Institute of Ocean Sciences, Patricia Bay, 186SL076130164 Victoria B.C. Pacific Marine Science Report 77-10. 186SL076130165 186SL07616 19541 3666000 3540000 3591000 3463000 3410000 3435000 186SL07616 19542 3369000 3532000 3656000 3911000 3824000 3776000 186SL07616 19551 3576000 3479000 3509000 3451000 3469000 3418000 186SL07616 19552 3381000 3506000 3576000 3791000 3707000 3547000 186SL07616 19561 3563000 3531000 3462000 3462000 3486000 3399000 186SL07616 19562 3451000 3497000 3716000 3810000 3846000 3670000 186SL07616 19571 3561000 3597000 3507000 3420000 3508000 3550000 186SL07616 19572 3372000 3518000 3818000 3642000 3756000 3558000 186SL07616 19581 3465000 3454000 3394000 3316000 3444000 3500000 186SL07616 19582 3429000 3389000 3639000 3743000 3656000 3494000 186SL07616 19591 3431000 3482000 3458000 3406000 3441000 3421000 186SL07616 19592 3367000 3508000 3570000 3778000 3720000 3592000 186SL07616 19601 3588000 3475000 3523000 3506000 3486000 3568000 186SL07616 19602 3438000 3734000 3626000 3869000 3657000 3600000 186SL07616 19611 3530000 3550000 3523000 3442000 3453000 3479000 186SL07616 19612 3493000 3566000 3719000 3822000 3701000 3671000 186SL07616 19621 3619000 3443000 3411000 3440000 3434000 3466000 186SL07616 19622 3480000 3497000 3581000 3795000 3772000 3550000 186SL07616 19631 3430000 3419000 3370000 3341000 3316000 3490000 186SL07616 19632 3392000 3392000 3585000 3640000 3465000 3407000 186SL07616 19641 3613000 3675000 3443000 3397000 3548000 3447000 186SL07616 19642 3383000 3569000 3712000 3770000 3751000 3640000 186SL07616 19651 3544000 3524000 3499000 3469000 3465000 3574000 186SL07616 19652 3477000 3426000 3658000 3572000 3663000 3615000 186SL07616 19661 3500000 3513000 3504000 3530000 3572000 3491000 186SL07616 19662 3441000 3601000 3832000 3635000 3623000 3679000 186SL07616 19671 3577000 3536000 3415000 3492000 3460000 3544000 186SL07616 19672 3497000 3572000 3743000 3868000 3730000 3570000 186SL07616 19681 3516000 3585000 3402000 3381000 3378000 3391000 186SL07616 19682 3446000 3556000 3751000 3697000 3546000 3500000 186SL07616 19691 3554000 3582000 3501000 3424000 3506000 3495000 186SL07616 19692 3496000 3433000 3685000 3734000 3755000 3566000 186SL07616 19701 3577000 3472000 3597000 3411000 3428000 3478000 186SL07616 19702 3380000 3536000 3618000 3811000 3744000 3642000 186SL07616 19711 3582000 3553000 3545000 3449000 3449000 3389000 186SL07616 19712 3428000 3506000 3744000 3844000 3669000 3541000 186SL07616 19721 3579000 3600000 3427000 3436000 3460000 3450000 186SL07616 19722 3631000 3579000 3631000 3627000 3624000 3609000 186SL07616 19731 3607000 3509000 3526000 3528000 3540000 3590000 186SL07616 19732 3568000 3657000 3628000 3886000 3805000 3668000 186SL07616 19741 3676000 3643000 3493000 3433000 3517000 3560000 186SL07616 19742 3463000 3604000 3646000 3911000 3839000 3763000 186SL07616 19751 3584000 3581000 3570000 3477000 3560000 3514000 186SL07616 19752 3414000 3674000 3645000 3910000 3827000 3729000 186SL07616 19761 3589000 3577000 3551000 3541000 3555000 3525000 186SL07616 19762 3580000 3501000 3805000 3688000 3763000 3580000 186SL07616 19771 3680000 3528000 3425000 3388000 3442000 3489000 186SL07616 19772 3507000 3612000 3803000 3741000 3752000 3606000 186SL07616 19781 3530000 3516000 3536000 3460000 3543000 3501000 186SL07616 19782 3490000 3606000 3737000 3889000 3655000 3568000 186SL07616 19791 3432000 3424000 3501000 3495000 3560000 3480000 186SL07616 19792 3516000 3577000 3723000 3804000 3724000 3557000 186SL07616 19801 3554000 3535000 3509000 3484000 3534000 3401000 186SL07616 19802 3432000 3540000 3768000 3766000 3724000 3653000 186SL07616 19811 3605000 3572000 3457000 3494000 3504000 3595000 186SL07616 19812 3497000 3554000 3681000 3781000 3830000 3649000 186SL07616 19821 3523000 3564000 3508000 3532000 3477000 3548000 186SL07616 19822 3503000 3516000 3710000 3691000 3614000 3616000 186SL07616 19831 3589000 3588000 3590000 3482000 3496000 3520000 186SL07616 19832 3431000 3554000 3593000 3741000 3719000 3624000 186SL07616 19841 3652000 3608000 3481000 3525000 3538000 3517000 186SL07616 19842 3425000 3649000 3586000 3825000 3769000 3668000 186SL07616 19851 3532000 3576000 3608000 3427000 3470000 3675000 186SL07616 19852 3478000 3571000 3629000 3723000 3667000 3619000 186SL07616 19861 3500000 3589000 3533000 3469000 3497000 3498000 186SL07616 19862 3540000 3716000 3745000 3690000 3798000 3616000 186SL07616 19871 3549000 3464000 3471000 3481000 3476000 3538000 186SL07616 19872 3438000 3438000 3698000 3736000 3749000 3676010 186SL07616 19881 99999999 3616000 3625000 3492000 3533000 3495000 186SL07616 19882 3484000 3468000 3699000 3960000 3664000 3566000 186SL07616 19891 3632000 3536000 3523000 3477000 3551000 3509000 186SL07616 19892 3549000 3680000 3751000 3812000 3792000 3648000 186SL07616 19901 3697000 3553000 3499000 3549000 3522000 3550000 186SL07616 19902 3465000 3673000 3753000 3790000 3728000 3548000 186SL07616 19911 3614000 3554000 3561000 3495000 3447000 3436000 186SL07616 19912 3427000 3671000 3845000 3912000 3729000 3613000 186SL07616 19921 3548000 3524000 3578000 3525000 3562000 3543000 186SL07616 19922 3452000 3644000 3759000 3886000 3725000 3568010