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ICOADS Web information page (Wednesday, 25-Jul-2012 18:06:44 UTC): Chinese/Global Ocean Data Archeology and Rescue (GODAR) Ships (deck 781) (by ESRL)As part of the Global Ocean Data Archeology and Rescue (GODAR) project, surface marine ship data were digitized in China. The data were received at NCAR (http://rda.ucar.edu/datasets/ds541.4/) from NCDC on CD-ROM. Figure 1. Coverage for the period of record 1968-93 (414,409 unique output reports). IMMA supplemental data and conversion to other IMMA elements MARINE METEOROLOGICAL OBSERVATION DATA FORMAT DESCRIPTION ************************************************************************************ Po.No. element description ------------------------------------------------------------------------------------ 1 - 4 ship code 4 characters 5 - 8 year (GMT) 1900-present 9 -10 month 1-12 11 -12 day 1-31 13 -14 hour 0-23 15 -16 latitude degree 0-90 17 -20 latitude minute 0.0-59.9 21 -21 hemisphere(N or S) 22 -24 longitude degree 0-180 25 -28 longitude minute 0.0-59.9 29 -29 hemisphere(E or W) 30 -32 voyage direction 1-360, 888 for unknown and 999 for missing 33 -36 voyage speed knots, -9.9 for missing, -8.8 for unknown 37 -38 total cloud amount 0-11, // for unknown,blank for missing 0:clear or less then 1/20 1: 1/10 2: 2/10 3: 3/10 4: 4/10 5: 5/10 6: 6/10 7: 7/10 8: 8/10 9: 9/10 10: 10/10 11: The celestial dome is almost entirely covered, but with a few chinks. 39 -40 lower cloud amount 0-11, // for unknown,blank for missing 41 -44 type of high cloud Ci Cs Cc 45 -48 type of middle cloud As Ac 49 -52 type of low cloud Cu Cb Sc St Ns Fn '////' for unknown ' ' for no cloud 53 -56 cloud height 0000-9000, '8888' for unknown,'9999' for missing 57 -58 visibility 90-99 blank and '//' for missing or unknown 90:<50m 91:50m-200m 92:200m-500m 93:500m-1km 94:1-<2km 95:2-<4km 96:4-<10km 97:10-<20km 98:20-<50km 99:>=50km 59 -60 present weather the following codes mean: 00: no follow weather phenomenon 05: haze 10: mist 17: thunderstorm 19: squall 45: fog 50: drizzle 60: rain 69: rain or drizzle and snow 70: snow 80: rain shower 89: hail shower 95: thunderstorm with rain and/or snow The other codes use WMO 4677. blank for unknown and '//'for missing 61 -61 past weather 0-9 62 -62 2nd past weather 0-9 63 -66 wave height 0.0-50.0 99.9 for missing and 88.8 for unknown 67 -69 swell direction same as wind direction 70 -73 swell height meter 74 -74 wind indicator 0,1 no use 75 -77 wind direction 0-359,361 for calm and 362 for variable 78 -81 wind speed meters per second 82 -86 air temp. celsius degree -99.9 for missing and -88.8 for unknown 87 -91 wet bulb temp. celsius degree -99.9 for missing and -88.8 for unknown 92 -97 sea level pressure hPa 9999.9 for missing and 8888.8 for unknown 98-102 sea surface temp. celsius degree 103-108 salinity 99.999 for miss and 88.888 for unknown 109-109 sea luminance 0: no 1: yes 9 for missing and 8 for unknown 110-110 mark '*' 111-111 date flag '1' query 112-112 location flag 113-113 landlock flag 114-114 air temp. flag 115-115 wetbulb temp. flag 116-116 sea surface temp. flag 117-117 cloud flag 118-118 wind flag 119-119 wave flag 120-120 sea level pressure flag 121-121 weather flag 122-122 mark '*' ------------------------------------------------------------------------------------- * GENERALLY BLANK MEANS MISSING OBSERVATIONElements requiring conversion of units
TI time indicator = 0 = nearest whole hour LI lat/lon indicator = 4 = degrees and minutes II id indicator = 1 = ship, OSV, or ice station call sign DI wind direction indicator = 5 = 360-point compass WI wind speed indicator = 1 = meter per second, measured IT indicator for temperatures = 0 = degrees Celsius and tenths DCK deck = 781 = Chinese/Global Ocean Data Archeology and Rescue (GODAR) Ships SID source ID = 143 = Chinese/Global Ocean Data Archeology and Rescue (GODAR) Ships PT platform type = 5 = ship Assessments of data quality Figure 2. Number of reports per year plotted separately to show the trimming flag value, within those reports, for these variables: SF = sea surface temperature, AF = air temperature, UF and VF = wind U and V components, PF = sea level pressure, RF = relative humidity. The trimming flags are defined as follows, where a1 is the individual observation under scrutiny, g is the smoothed median, and s1 and s5 are the smoothed lower and upper median deviation: F = data missing or not computable E = data unusable (SF, AF, and PF, only) C = limits missing (ocean/coastal box) 7 = greater than 4.5 sigma upper limit (a1 > g + 4.5*s5) 6 = less than 4.5 sigma lower limit (a1 < g - 4.5*s1) 5 = greater than 3.5 sigma upper limit (g + 3.5*s5 < a1 <= g + 4.5*s5) 4 = less than 3.5 sigma lower limit (g - 4.5*s1 <= a1 < g - 3.5*s1) 3 = greater than 2.8 sigma upper limit (g + 2.8*s5 < a1 <= g + 3.5*s5) 2 = less than 2.8 sigma lower limit (g - 3.5*s1 <= a1 < g - 2.8*s1) 1 = within 2.8 sigma limits (g - 2.8*s1 <= a1 <= g + 2.8*s5)
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