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García-Herrera, Ricardo; Können, Gunther P; Wheeler, Dennis A; Prieto, Maria del Rosario; Jones, Philip D; Koek, Frits B (2010): Meteorological observations during ASSURANCE cruise from Cadiz to Spithead started at 1750-01-01. National Maritime Museum, Greenwich, United Kingdom, PANGAEA,, In: Jones, Philip D; Wheeler, Dennis A; Können, Gunther P; Koek, Frits B; Prieto, Maria del Rosario; García-Herrera, Ricardo (2007): Climatological observations from ship logbooks between 1750 and 1854 (release 2.1). PANGAEA,

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Related to:
García-Herrera, Ricardo; Können, Gunther P; Wheeler, Dennis A; Prieto, Maria del Rosario; Jones, Philip D; Koek, Frits B (2005): CLIWOC: A Climatological Database for the World's Oceans 1750-1854 (and 10 more publications about CLIWOC results in the same volume). Climatic Change, 73(1-2), 1-12ff,
Median Latitude: 47.235000 * Median Longitude: -8.105000 * South-bound Latitude: 44.320000 * West-bound Longitude: -10.980000 * North-bound Latitude: 49.470000 * East-bound Longitude: -6.780000
Assurance_17500101_NMM_ADM/L/A217 * Latitude Start: 36.070000 * Longitude Start: -6.730000 * Latitude End: 50.680000 * Longitude End: -0.960000 * Campaign: Cliwoc_cruise * Device: Underway cruise track measurements (CT) * Comment: Ship: Assurance (5th Rate Frigate), Start of voyage: 1750-01-01, End of voyage: 1750-01-04, Voyage: Cadiz - Spithead, 1st Observer: John Spiller (Author), Company: Royal Navy, Other ship information: 44G 814BM
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Date/time startDate/time start
4Wind directiondddegWind direction (from which the wind is blowing) in whole degrees from: 1-360; 361 = calm, 362 = variable. It is not clear from many logbook entries whether the wind direction has been corrected for the magnetic variation (or declination). To avoid any misunderstanding, all winds from reports that included a valid position in the period 1750-1854 were corrected. All other wind directions are given without being corrected.
5Wind speedffm/scalculated from the descriptive terms of wind force given in the observations
6LandmarkLandmarkName of first landmark
7BearingBearingBearing of the first landmark
8CourseCourseCourse of the ship during the past 24 hours
9DistanceDistancearbitrary unitsDistance travelled during the previous 24 hours
10DeclinationDecldegIt is generally accepted by the CLIWOC team that the wind directions, reported by the ships officers, were relative to the magnetic North direction. Navigators were well aware of the difference between the true and magnetic north direction, but the compasses (we assumed that the bearing-compasses were mostly used for determining the wind direction) were not always adjusted. Therefore the wind direction has to be corrected. The magnetic declination (or variation, as it is known on board ships) is given for the whole CLIWOC period (1750-1850) for every 5x5 degree square. The number was added to the wind direction to get the true wind direction.
11Wind direction descriptionWind dir descrAll reported wind directions on this day. The wind direction is the direction that points to where the wind comes from.
12Wind force descriptionWind force descrAll reported wind forces on this day
13Precipitation descriptionPrecip descr
14State of the sea descriptionState sea descr
16GustsGusts1 If wind gusts are reported
17Precipitation/RainRain1 If rain was reported
18FogFog1 If fog was reported
19Snow typeSnow1 If snow was reported
20ThunderThunder1 If thunder and or lightning was reported
21HailHail1 If hail was reported
22Sea iceSea ice1 If sea-ice or icebergs were reported
23IdentificationIDCLIWOC 2.1 line number
74 data points

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