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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 AKERENDAM cruise from Ceylon to Texel started at 1753-11-15. Nationaal Archief of the Netherlands, Den Haag, 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: 1.066103 * Median Longitude: 3.547132 * South-bound Latitude: -36.170000 * West-bound Longitude: -35.020000 * North-bound Latitude: 52.530000 * East-bound Longitude: 77.170000
Akerendam_17531115_VOC_152_5130 * Latitude Start: 6.420000 * Longitude Start: 83.080000 * Latitude End: 53.090000 * Longitude End: 4.670000 * Campaign: Cliwoc_cruise * Device: Underway cruise track measurements (CT) * Comment: Ship: Akerendam, Start of voyage: 1753-12-01, End of voyage: 1754-05-14, Voyage: Ceylon - Texel, 1st Observer: Cornelis Van de Stam (Ltz), Company: VOC, Dutch Asiatic Shipping Number: 7416.4, Other ship information: GEMONTEERT MET 28 STUKKEN KANON EN 4 METAEL 1 PONDS, BEMAND MET 350 KOPPEN ZOO ZEEVAERENDE ALS MILITAIREN. GEBOUWD IN 1743 TE AMSTERDAM, LAADVERMOGEN 1150 TON
#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
7LandmarkLandmarkName of first landmark
8BearingBearingBearing of the first landmark
9Distance to landmarkDistancearbitrary unitsDistance to the first landmark
10LandmarkLandmarkName of second landmark
11BearingBearingBearing of the second landmark
12--1 If position is considered to be coastal (in port or near coastal disturbances)
13WatchWatchName of the period of 4 hours which is known as a watch or duty on board ships
14GlassesGlassesNumber of glasses within a watch; one watch equals 8 glasses
15CommentCommentLife on board
16CourseCourseCourse of the ship during the past 24 hours
17DistanceDistancearbitrary unitsDistance travelled during the previous 24 hours
18CommentCommentOther remarks, that were not possible to put in the other remark fields
19Comment 2 (continued)Comm 2Other remarks
20DeclinationDecldegIt 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.
21Wind direction descriptionWind dir descrAll reported wind directions on this day. The wind direction is the direction that points to where the wind comes from.
22Wind force descriptionWind force descrAll reported wind forces on this day
23Present weatherwwWeather description
24Precipitation descriptionPrecip descr
25State of the sea descriptionState sea descr
26Cloud typeCloud type
27GustsGusts1 If wind gusts are reported
28Precipitation/RainRain1 If rain was reported
29FogFog1 If fog was reported
30Snow typeSnow1 If snow was reported
31ThunderThunder1 If thunder and or lightning was reported
32HailHail1 If hail was reported
33Sea iceSea ice1 If sea-ice or icebergs were reported
35IdentificationIDCLIWOC 2.1 line number
2833 data points

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