PELICAN in CBLAST-Low UCI PRELIMINARY DATA Version 3.0 February-March, 2005 f_* Fast rate (40 Hz) data file/variable name (Combined 1-Hz and 40-Hz for f_*mat files) m_* Medium rate (10 Hz, boxcar averages from 40 Hz) data file/variable name s_* Slow rate (1 Hz, boxcar averages from 40 Hz) data file/variable name Column Variable Description Units 1 t UTC YYYYMMDDHHMMSS.xx 2 hr Radar Altitude m 3 lat Latitude deg N 4 lon Longitude deg E 5 trk Track Angle deg 6 wx East Wind m/s 7 wy North Wind m/s 8 wz Vertical Wind m/s 9 ah Absolute Humidity g/m3 10 ta Ambient Temperature deg C 11 td Dewpoint Temperature EdgeTech deg C 12 ts IR Sea Surface Temperature deg C 13 ps Static Pressure hPa 14 sw Incoming Shortwave Irradiance W/m2 Notes: 1. In the ASCII files, variables from left to right correspond to the variables from top to bottom in the table above. 2. The m_* and s_* data are 10-Hz and 1-Hz boxcar averages obtained from the original 40-Hz data except for t (UTC) and track angle which are sub-sampled to avoid discontinuities due to the YYYYMMDDHHMMSS format and polarity, respectively. 4. Additional "house-keeping" variables in version V3.0 of March 2005: z_bad_dpet_ndx Indices of HF noise on DP [Start End] z_bad_dpet_utc UTC of HF noise on DP [Start End] z_bad_ttr_ndx Indices of HF noise on TT [Start End] z_bad_ttr_utc UTC of HF noise on TT [Start End] z_daq_interp_ndx Indices of DAQ gap [Start End] z_daq_interp_utc UTC of DAQ gap [Start End] These variables are provided only in the f_YYMMDD.mat files. The four first variables keep track of the HF radio noise interference with total temperature and dewpoint temperature signals (a total of 5 signals). For example, "z_bad_ttr_ndx" indicate the sample numbers of start and end of HF radio noise on temperature signals. The UTC information for the HF radio noise is provided in "z_bad_ttr_utc" [yy mm dd hh mm ss.x yy mm dd hh mm ss.x] The duration of each HF radio noise event varied from 0.33 s to 21.8 s and totaled 1070 seconds over the 10 flights corrected so far. Unlike our past experience with such noise on one type of temperature sensor when the signal was simply "bumped" up by a relatively easy to determine bias, on the Pelican the signal for the duration of each HF event is heavily modulated. Because of this, it is not possible to "salvage" the signal during the HF events and all affected signals were linearly interpolated for each event. It should be noted that in general the HF radio was mostly used during takeoff and landing. However there are flights when the flight conditions were pretty nasty (hase, fog ...) and the pilot had to use radio during research legs (e.g., 030818). HF Radio was used a lot on the first few flights too when the crew was getting "calibrated" with the research area. The two last variables are present only in f_030821.mat and f_030823.mat for the two flights when the analog data stream experienced 1-s time gaps (eleven 1-second time gaps on flight 030821 and two 1-second time gaps on flight 030823). Note that the format for z_daq_interp_utc is [hh mm ss.x hh mm ss.x]. All recorded analog data were interpolated using MATLAB's piecewise cubic Hermite interpolation over missing seconds. The user may choose to fill in the gaps in a different way using the provided house-keeping variables. 5. If you use the UCI Pelican CBLAST data, we would appreciate it if you fill out the form below and send it electronically to us (dkhelif@uci.edu). This will enable us to keep you informed about revisions and future updates and perhaps consider collaborative work with you. --------------------------------------------------------------------------- Name: Institution: E-mail address: