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Summary of Modifications to the HOT Database

Date correction applied	Description
3 November 2006	Inorganic nutrients from cruises 127 through 166 were measured and quality controlled after a long hiatus. See Nutrients 127-166 for details.
17 November 2003	CTD and bottle salinity corrections. Corrections to improve the quality of the database salinities are being implemented. See Salinity Corrections for details.
26 August 2003	Corrected sea surface bucket temperature from cruises HOT-128 through 132 (July-November 2001). Temperatures were high by about 0.5 degC as compared to surface CTD data. See Meteorological Corrections for details.
2 May 2002	Additional corrections to meteorological data. See Meteorological Corrections for details.
16 Aug. 2001	Some of the meteorological observations from cruises 1 through 110 have been corrected. Details of these corrections are in meteorological -corrections.
22 Jan. 1999	A correction was applied to the CTD temperatures and salinities from cruises before 1996. This correction was due to an unaccounted for pressure effect on the temperature sensors, and also due to the viscous heating of the temperature sensor tip due to the water flow around it. Details on the nature of these corrections and their effect on the CTD data can be found here.
15 Dec. 1995	Nutrients with zero (0) value were being entered as invalid data for cruises 44 through 50. A list of the corrected data is provided.
24 Mar. 1994	Bottle salinities from years 2, 3 and 4 were re-flagged using a CTD-bottle difference criteria that is less strict for bottles in the pycnocline. The new method is documented here, together with a list of the bottles affected. Erroneous down-cast CTD oxygen values were corrected for some of the cruises during years 2, 3 and 4. Click here for details on the magnitude of the correction and files affected.