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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 Africaensche Galey cruise from Ramekens to Guinea started at 1750-01-06. Rijksarchief Zeeland, Middelburg, Netherland, 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: 32.546346 * Median Longitude: -17.189423 * South-bound Latitude: 6.980000 * West-bound Longitude: -24.400000 * North-bound Latitude: 49.620000 * East-bound Longitude: -5.780000
Africaensche_Galey_17500106_MCC_20_204 * Latitude Start: 51.430000 * Longitude Start: 3.490000 * Latitude End: 4.480000 * Longitude End: 1.680000 * Campaign: Cliwoc_cruise * Device: Underway cruise track measurements (CT) * Comment: Ship: Africaensche Galey, Start of voyage: 1750-01-06, End of voyage: 1750-02-28, Voyage: Ramekens - Guinea, 1st Observer: C. Mattijsen (Kapitein), Company: MCC
#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
6Image numberImageIdentification Number of the original image
7--1 If position is considered to be coastal (in port or near coastal disturbances)
8WatchWatchName of the period of 4 hours which is known as a watch or duty on board ships
9GlassesGlassesNumber of glasses within a watch; one watch equals 8 glasses
10CourseCourseCourse of the ship during the past 24 hours
11DistanceDistancearbitrary unitsDistance travelled during the previous 24 hours
12CommentCommentAny remark, found in the logbook on this particular day, about any biological item
13DeclinationDecldegIt 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.
14Wind direction descriptionWind dir descrAll reported wind directions on this day. The wind direction is the direction that points to where the wind comes from.
15Wind force descriptionWind force descrAll reported wind forces on this day
16Present weatherwwWeather description
17Precipitation descriptionPrecip descr
18State of the sea descriptionState sea descr
19Cloud typeCloud type
21GustsGusts1 If wind gusts are reported
22Precipitation/RainRain1 If rain was reported
23FogFog1 If fog was reported
24Snow typeSnow1 If snow was reported
25ThunderThunder1 If thunder and or lightning was reported
26HailHail1 If hail was reported
27Sea iceSea ice1 If sea-ice or icebergs were reported
28IdentificationIDCLIWOC 2.1 line number
1057 data points

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