|Earth Relative Wind Direction||(DIR)|
|Earth Relative Wind Speed||(SPD)|
|Total Cloud Amount||(TCA)*|
|Low/middle cloud Amount||(LMCA)*|
|Cloud Base Height||(ZCL)*|
|Low Cloud Type||(LCT)*|
|Middle Cloud Type||(MCT)*|
|High Cloud Type||(HCT)*|
Details of each cruise including cruise dates, number of records, number of values, number of flags, and percentage flagged are listed in
Table 1. A total of 1,116 values are evaluated with 8 flags added by the preprocessor and Data Quality Evaluator for a total of 0.72 percent
of the values being flagged.
|CTC||Dates||Number of Records||Number of Values||Number of Flags||Percentage Flagged|
|PR_14_/05||5/28/95 - 6/16/95||68||612||7||1.14|
|SR_01_/09||11/28/95 - 12/15/95||56||504||1||0.20|
|Variable||D||G||K||Total Number of Flags||Percentage of Variable Flagged|
|TS|| ||4|| ||4||3.22|
|Total number of Flags|
|Percentage of All Values Flagged|
TD greater than T
The prescreener performs a multivariate check to determine if the reported dewpoint temperature is greater than the reported air temperature, a physical impossibility. When TD is greater than T, a "D" flag is assigned to both the T and TD values. The variables failed this test one time and were flagged appropriately.
The prescreener compares the values of SPD, TS, P, and T to a climatology (da Silva et al. 1994) and assigns the "G" flag for values outside of four standard deviations from the mean. TS received four "G" flags, but the analyst believes the data represent accurate values. They were measured off the southern coast of Chile, where the weather is highly variable and the climatology questionable. The "G" flags were left in place to call attention to relatively extreme sea temperatures.
On 6/11/92 a positive spike of 8 degrees C occurred in the air temperature plot. A similar spike of 3 degrees C occurred simultaneously in dewpoint temperature. These spikes were flagged with a "K" instead of an "S" because they may represent accurate values. The analyst finds them suspicious, but at a time step of 6 hours and because both variables spiked he could not prove them to be in error.
da Silva, A. M., C. C. Young and S. Levitus, 1994: Atlas of Surface Marine Data 1994, Volume 1: Algorithms and Procedures. NOAA Atlas Series. In preparation.
Smith, S. R., C. Harvey, and D. M. Legler, 1996: Handbook of Quality Control Procedures and Methods for Surface Meteorology Data. WOCE Report No. 141/96, Report WOCEMET 96-1, Center for Ocean Atmospheric Prediction Studies, Florida State University, Tallahassee, FL 32301