note_lb1_hobo_tem.txt : 26 Onset HOBO Water Temperature Data Loggers were deployed at the Long Bay #1 (LB1) T-chain mooring. HOBO_#18 had no "in-water" data because the sample rate was set to record every 5 seconds, instead of every 5 minutes. The individual Level_0 data files (Long_Bay_--_HOBO_*.csv from /data/long_bay/level0/lb1/hobo/ on nccoos.org) were loaded into MATLAB and a matrix of corrected temperatures was created for 25 vertical levels. The original HOBO temperatures were adjusted to match the near-bottom logger (HOBO_#24) during a well-mixed period [ 29 Jan 2012 from 00:00 to 12:00 GMT ]. HOBO_#24 temperatures were also very similar to those recorded by the Sea_Bird MicroCat at the nearby LB1 ADCP mooring. The corrections for each HOBO are listed in the table below. ----------------------------------- The MATLAB file lb1_hobo_tem.mat = Name Size Bytes %% description config 1x1 2880 struct w/ config info dn_hobo 1x22465 179720 datenum time_counter hobo_corr 1x25 200 temperature correction hobo_order 1x25 200 HOBO_# mab 1x25 200 height above bot (m) platform 1x1 1514 struct w/ platform info tem_mat_fix 22465x25 4493000 corrected tem [ 25 levels ] ----------------------------------- The data files have NOT been trimmed to "in-water" times. Start and end times for the matrix : datestr(dn_hobo([1 end]),31) %% 2012-01-18 12:00:00 - 2012-04-05 12:00:00 GMT ----------------------------------- The temperature matrix is organized from the bottom -> up. [(1:25)' hobo_order' mab' hobo_corr'] 1 24 0.3 0 2 26 0.6 -0.029 3 1 1.0 0.072 4 2 2.0 -0.029 5 3 3.0 -0.003 6 4 4.0 -0.034 7 5 5.0 0.049 8 6 6.0 -0.067 9 7 7.0 -0.039 10 8 8.0 -0.003 11 9 9.0 -0.030 12 10 10.0 -0.012 13 11 11.0 0.033 14 12 12.0 0.044 15 13 13.0 0.022 16 14 14.0 0.042 17 15 15.0 -0.006 18 16 16.0 -0.003 19 17 17.0 0.091 20 19 19.0 0.036 21 20 20.0 0.021 22 21 21.0 -0.043 23 22 22.0 0.027 24 23 23.0 -0.064 25 25 24.0 -0.023 ----------------------------------- ----------------------------------- A good "in-water" trim would be : 2012-01-20 15:50:00 - 2012-04-04 14:00:00 GMT itrim=find(dn_hobo>=datenum(2012,01,20,15,50,00) ... & dn_hobo<=datenum(2012,04,04,14,00,00)); ----------------------------------- -----------------------------------