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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 NISUS cruise from Batavia to Port Louis started at 1811-09-27. National Maritime Museum, Greenwich, United Kingdom, PANGAEA, https://doi.org/10.1594/PANGAEA.750949, 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, https://doi.org/10.1594/PANGAEA.611088

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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, https://doi.org/10.1007/s10584-005-6952-6
Coverage:
Median Latitude: -20.182500 * Median Longitude: 78.517917 * South-bound Latitude: -26.480000 * West-bound Longitude: 57.500000 * North-bound Latitude: -5.700000 * East-bound Longitude: 106.000000
Date/Time Start: 1811-09-27T05:00:00 * Date/Time End: 1811-10-20T08:00:00
Event(s):
Nisus_18110927_NMM_RUSI/NM/180/10 * Latitude Start: -6.100000 * Longitude Start: 106.860000 * Latitude End: -21.200000 * Longitude End: 58.170000 * Date/Time Start: 1811-09-27T00:00:00 * Date/Time End: 1811-10-20T00:00:00 * Campaign: Cliwoc_cruise * Device: Underway cruise track measurements (CT) * Comment: Ship: Nisus (5th Rate Frigate), Voyage: Batavia - Port Louis, 1st Observer: Philip Beaver (Captain), Company: Royal Navy, Other ship information: 38G 1071BM
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1DATE/TIMEDate/TimeGeocode
2LATITUDELatitudeGeocode
3LONGITUDELongitudeGeocode
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)
12CourseCourseCourse of the ship during the past 24 hours
13DistanceDistancearbitrary unitsDistance travelled during the previous 24 hours
14DeclinationDecldegIt 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.
15Sensor readingReadingarbitrary unitsReading of the (outside) air thermometer
16Sensor readingReadingarbitrary unitsReading of the air pressure
17Wind direction descriptionWind dir descrAll reported wind directions on this day. The wind direction is the direction that points to where the wind comes from.
18Current direction descriptionCur dir descrDirection of the current. This direction points to where the current is flowing towards to.
19Current speed descriptionV descr
20Wind force descriptionWind force descrAll reported wind forces on this day
21Present weatherwwWeather description
22Precipitation descriptionPrecip descr
23ClearnessClearness
24GustsGusts1 If wind gusts are reported
25Precipitation/RainRain1 If rain was reported
26FogFog1 If fog was reported
27Snow typeSnow1 If snow was reported
28ThunderThunder1 If thunder and or lightning was reported
29HailHail1 If hail was reported
30Sea iceSea ice1 If sea-ice or icebergs were reported
31CommentComment
32IdentificationIDCLIWOC 2.1 line number
Size:
602 data points

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