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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 La Boussole cruise from Castries started at 1785-08-13. Nederlands Instituut voor Wetenschappelijke Inform, Amsterdam, 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: 18.972162 * Median Longitude: 179.247635 * South-bound Latitude: -36.760000 * West-bound Longitude: 113.540000 * North-bound Latitude: 58.600000 * East-bound Longitude: -16.920000
Date/Time Start: 1785-08-13T13:00:00 * Date/Time End: 1787-08-02T03:00:00
La_Boussole_NIWI-F-1573 * Latitude Start: 51.450000 * Longitude Start: 140.850000 * Latitude End: 51.450000 * Longitude End: 140.850000 * Date/Time Start: 1787-07-29T00:00:00 * Date/Time End: 1787-08-02T00:00:00 * Campaign: Cliwoc_cruise * Device: Underway cruise track measurements (CT) * Comment: Ship: La Boussole (Exploration Ves), Voyage from: Castries, 1st Observer: J.F.G. de La Perouse (Kapitein), Other ship information: 450 TONS, THREE MASTS, SQUARE RIGGED, COMPLEMENT 113. HET GEDRUKTE BOEK HEET: VOYAGE DE LA PEROUSE AUTOUR DU MONDE. (1797), GEREDIGEERD DOOR M.L.A. MILET-MUREAU. HET BETREFT EEN ZEER BEKENDE REIS WAAROVER OP INTERNET VEEL IS GEPUBLICEERD. HET DERDE DEEL BEVAT EEN TABEL MET METEREOLOGISCHE GEGEVENS, DEZE IS HIER VERWERKT. HET SCHIP VOER IN KONVOOI MET L'ASTROLABE, DIT JOURNAAL IS OOK IN TABELVORM WEERGEGEVEN EN GEEFT OOK UITGEBREIDE WEERGEGEVENS.
#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
8LandmarkLandmarkName of first landmark
9BearingBearingBearing of the first landmark
10Distance to landmarkDistancearbitrary unitsDistance to the first landmark
11--1 If position is considered to be coastal (in port or near coastal disturbances)
12CommentCommentOther remarks, that were not possible to put in the other remark fields
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.
14Sensor readingReadingarbitrary unitsReading of the (outside) air thermometer
15Sensor readingReadingarbitrary unitsReading of the air pressure
16Wind direction descriptionWind dir descrAll reported wind directions on this day. The wind direction is the direction that points to where the wind comes from.
17Wind force descriptionWind force descrAll reported wind forces on this day
18Present weatherwwWeather description
19Precipitation descriptionPrecip descr
20GustsGusts1 If wind gusts are reported
21Precipitation/RainRain1 If rain was reported
22FogFog1 If fog was reported
23Snow typeSnow1 If snow was reported
24ThunderThunder1 If thunder and or lightning was reported
25HailHail1 If hail was reported
26Sea iceSea ice1 If sea-ice or icebergs were reported
27IdentificationIDCLIWOC 2.1 line number
2757 data points

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