Format: TGINEX version 1.0 PSMSL code: 980045 ESEAS ID: NUUK Station Name: nuuk Country: Greenland / Denmark ??? Contributor: DTU Latitude: 64.1713 Longitude: -51.7198 Coordinate system: WGS84 ??? Record interval: 5 minutes Sampling interval: 5 minutes Datum information: The data refer to Tide Gauge Zero ??? Instrument type: Pressure (Aanderaa WLR-7) ??? Quality control level: L1 ??? Quality control flag: 1-Correct value, 2-Interpolated value, 3-Wrong value, * 4-Std. Atm. press used, *new value introduced. 9-Missing value Parameter 1: Date (yyyy/mm/dd) Parameter 2: Time (hh:mm:ss) Parameter 3: Observed sea level (m) Parameter 4: Quality control flag of Observed sea level Parameter 5: Residual (observed - predicted sea level) (m) Parameter 6: Quality control flag of Residual ============================================================================== Methods and choices made ============================================================================== In an effort to provide as much information as possible some choices have been made: Since the atmospheric pressure, that is used in the calculation of the measured waterpressure, is obtained from a met-sensor which records at 5 minute intervals at times divisible by 5 (00:00, 00:05, 00:10..), the sealevel recordings are aligned to the nearest time divisble by 5 minutes, in order to collate sealevel gauge and atmospheric pressure recordings. Seconds are allways '00'. Atmospheric pressure is assumed to decrease by 1 HPa/8 meter in alti- tude ie. there is added 8.52HPa (68.15m/8) to the measured atmospheic pressure. Gravity is determined by applying the 'Gravity formula 1967': G=978031,85*(1+0,005278895*(SIN(lat*Pi/180))**2+ \ 0,000023462*(SIN(lat*Pi/180)**4))/100000 Quality control is merely a visual inspection of plottet data. Values for measured waterpressure are marked as QC-code '9', when they exceed approximately mean +/- 3.5 Std.dev. and are written to an error file. In the special case, where there is no (time-) matching atmospheric pressure value to a sealevel gauge recording, the standard atmospheric pressure of 1013.25 HPa is used in the calculation. A new QC-code (4) is introduced to mark this case. Missing recordings are set to '9999.999'-values. A file ("site"_"YY"_"MM"_height_1013.txt) with sealevel calculated with the standard atmmospheric pressure of 1013.25 HPa, is supplpied for the convience of the users of data, if comparisons are needed. ============================================================================== Change-log ============================================================================== 03-09-2014 In order to catch, and distinguish, irregular sensor values, these error codes have been added to the processed data: MaxUppPress MinLowPress MaxUppConduct MinLowConduct MaxUppTemp MinLowTemp nuuk 180 105 40 10 20 -2.9 Error code 2 3 7 8 5 6