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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 ALGIERS cruise from Texel to St. Salvador started at 1833-06-27. 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: 22.903396 * Median Longitude: -17.992075 * South-bound Latitude: -13.130000 * West-bound Longitude: -38.200000 * North-bound Latitude: 52.550000 * East-bound Longitude: 2.750000
Date/Time Start: 1833-06-27T12:00:00 * Date/Time End: 1833-08-18T15:00:00
Algiers_18330627_MAR_D23905_59 * Latitude Start: 53.090000 * Longitude Start: 4.670000 * Latitude End: -13.130000 * Longitude End: -38.200000 * Date/Time Start: 1833-06-27T00:00:00 * Date/Time End: 1833-08-18T00:00:00 * Campaign: Cliwoc_cruise * Device: Underway cruise track measurements (CT) * Comment: Ship: Algiers (Fregat), Voyage: Texel - St Salvador, 1st Observer: Van Daalen (Commandant Kolonel), 2nd Observer: Van Leeuwen Coster (Eerste Officier), 3rd Observer: Van Der Moore (Luitenant 2E Klasse), Company: MAR, Other ship information: 127 MANSCHAPPEN: 10 ONDEROFFICIEREN. 25 MATROZEN 1E KLAS. 24 MATROZEN 2E KLAS. 66 MATOZEN 3E KLAS. 5 JONGENS
#NameShort NameUnitPrincipal InvestigatorMethodComment
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
6Pressure, atmosphericPPPPhPaNo temperature correction was applied. The following factors have been used for the conversion to hPa: 2.54 cm in an inch; 13.596 specific gravity of mercury; 980.65 cm/s gravity at 45° latitude
7Temperature, airTTT°C
8Image numberImageIdentification Number of the original image
9LandmarkLandmarkName of first landmark
10BearingBearingBearing of the first landmark
11Distance to landmarkDistancearbitrary unitsDistance to the first landmark
12LandmarkLandmarkName of second landmark
13BearingBearingBearing of the second landmark
14Distance to landmarkDistancearbitrary unitsDistance to the second landmark
15--1 If position is considered to be coastal (in port or near coastal disturbances)
16WatchWatchName of the period of 4 hours which is known as a watch or duty on board ships
17GlassesGlassesNumber of glasses within a watch; one watch equals 8 glasses
18CommentCommentLife on board
19CourseCourseCourse of the ship during the past 24 hours
20DistanceDistancearbitrary unitsDistance travelled during the previous 24 hours
21CommentCommentOther remarks, that were not possible to put in the other remark fields
22DeclinationDecldegIt 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.
23Sensor readingReadingarbitrary unitsReading of the (outside) air thermometer
24Sensor readingReadingarbitrary unitsReading of the air pressure
25Wind direction descriptionWind dir descrAll reported wind directions on this day. The wind direction is the direction that points to where the wind comes from.
26Wind force descriptionWind force descrAll reported wind forces on this day
27Present weatherwwWeather description
28Precipitation descriptionPrecip descr
29State of the sea descriptionState sea descr
30Cloud typeCloud type
32GustsGusts1 If wind gusts are reported
33Precipitation/RainRain1 If rain was reported
34FogFog1 If fog was reported
35Snow typeSnow1 If snow was reported
36ThunderThunder1 If thunder and or lightning was reported
37HailHail1 If hail was reported
38Sea iceSea ice1 If sea-ice or icebergs were reported
39IdentificationIDCLIWOC 2.1 line number
1229 data points

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