1. Introduction and Background Info

These pages describe the procedure and results of a calibration of the main tower temperature, relative humidity and winds. Most of the information used for this study was obtained from periods when the tower hazer (vertically-moving instrument platform) was at the same level as another permanent tower level. Time is indicated by Julian Day (JD) such that Jan 1, 0 hours, 1997 = JD 1 and Jan 1, 1998 = JD 366. All times are UT.

I define the following levels:

Generally I use these level numbers to describe which variable is being discussed. For example T1 vs. T3 is a comparison of the lower hazer temperature vs. the temperature at Level 3.

Calibrations occurred during the following periods when two or more sensors where at or near the same level:

Unfortunately there was a large gap during the winter when no calibrations were performed. Therefore for the temperature calibration I used another method (described in temperature section) to fill in this gap. This is what the "Period 2.5" was used for.

I used the file "proc_file_all2_ed_hd.txt" that Ola created for all input data used in this study. I used my MATLAB program read_prof_file_all2.m to load all the data, assign variable names, assign "NaN" to the bad data and correct some top level heights for a few periods when I didn't input them into the field collection program. This program also calls other programs which perform the corrections I recommend based on this study.

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Last update: 5/4/99

Please send all comments and suggestions to the author, Peter Guest,