Data sources and correctionsOverall, COADS Release 1a offers a substantial augmentation in weekly numbers of reports in comparison to the interim data (Fig. 1A). When the comparison is restricted to ship data, inclusion of delayed international logbook reports is shown to yield a large benefit with the passage of time (Fig. 1B). In addition, the logbook reports contain important information, such as the sea surface temperature (SST) measurement method indicator, not currently available in GTS reports. Besides the available international logbook data, records from the Russian Marine Meteorological Data Set have been included, as well as special fishing fleet data that helped fill important gaps in data coverage in the tropical Pacific.
Automated platform data have been similarly improved and expanded by including three important sets of delayed, quality-controlled data:
Similarly, U.K. logbook reports containing erroneous SST measurement method indicators were replaced from update tapes. Another example of a problem in the logbook data, extending through 1988, is a displacement of French reports by 10 degrees of longitude within 90E-90W across the dateline, due to a WMO code ambiguity. Replacement data have been received from France; however, because of questions about the exact duration of the problem, it was possible for Release 1a only to delete the logbook reports under the assumption that they would be replaced in many cases by properly located GTS data. Several comparatively minor archival problems were also left partially corrected or uncorrected in other data sources, awaiting future updates. Electronically available documentation for COADS products includes additional information about data problems and corrections.
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Updated: Nov 8, 2005 23:57:03 UTC