GCIP/EAOP-98 Grifton, NC Tower Meteorological and Carbon Dioxide Data Set ---------------------------------------------------------------------------- 1.0 General Information This data set was provided to UCAR/JOSS by Dr. Ken Davis and Dr. Peter Bakwin. Dr. Ken Davis is an Assistant Professor at the Department of Soil, Water, and Climate at the University of Minnesota. Dr. Peter Bakwin is at NOAA CMDL. For further information on these data please contact them: Name: Peter Bakwin Ken Davis Address: NOAA ERL R/E/CG1 439 Borlaug Hall 325 Broadway 1991 Upper Buford Circle Boulder, CO 80303 University of Minnesota St. Paul, MN 55108-6028 e-mail: pbakwin@cmdl.noaa.gov kdavis@soils.umn.edu Phone: 303-497-6773 (612) 625-2774 Fax: 303-497-6290 (612) 625-2208 2.0 Quality Control These data were quality assured and quality controlled by the organizations listed above, UCAR/JOSS has not changed these data in any way, and has conducted no quality control on this data set. The quality of the CO2 data for 123 and 496 m during 950220-950413 was compromised by calibration problems. Use with caution. 3.0 Site Location The tower is the ICN Station and is located 3 km east of Grifton, North Carolina. Latitude Longitude Elevation (msl) ----------- ----------- ----------------- 35 21' 55" N 77 23' 38" W 9 m The elevation is that of the tower base. Local Standard Time (LST = CST) = GMT - 5 hours 4.0 Measurements 4.1 itn1997.hr.all and itn1998.hr.all Each record (row) is a 30 (starting 950414) or 36 (before 950414) min average of all data. The time is for the middle of that period. There are 23 entries in each record, as below. Col Data Units No data c1 c2 --- -------------------- ------------ -------- --- --- 1 Year GMT 1 4 2 Month GMT 6 7 3 Day GMT 9 10 4 Hour GMT 12 13 5 Minute GMT 15 16 6 CO2, 51 m ppm -999.99 18 24 7 CO2, 123 m ppm -999.99 26 32 8 CO2, 496 m ppm -999.99 34 40 9 Wind Speed, 51 m m/s -99.99 42 47 10 Wind Speed, 123 m m/s -99.99 49 54 11 Wind Speed, 429 m m/s -99.99 56 61 12 Wind Direction, 51 m degrees True -999 63 66 13 Wind Direction, 123 m degrees True -999 68 71 14 Wind Direction, 429 m degrees True -999 73 76 15 Temperature, 51 m degrees C -99.99 78 83 16 Temperature, 123 m degrees C -99.99 85 90 17 Temperature, 429 m degrees C -99.99 92 97 18 Mixing Ratio, 51 m g/kg -99.99 99 104 19 Mixing Ratio, 123 m g/kg -99.99 106 111 20 Mixing Ratio, 429 m g/kg -99.99 113 118 21 Surface Pressure mB -9999.9 120 126 22 PAR microE/m2/s -9999 128 132 23 Rainfall 0.01 inches -999 134 137 --- -------------------- ------------ -------- --- --- c1 c2 refer to the columns spanned by each data value, e.g., execution under UNIX of "cut -c 18-24 itn1995.hr.co2" would extract the data for CO2 at 51 m for 1995. 4.2 itn1997.day.co2 and itn1998.day.co2 Files contain the daily average CO2 mixing ratios for the 51, 123, and 496 m levels. Missing data are assigned -999.99. 4.3 itn1997.diurnal.co2 and itn1998.diurnal.co2 Files contain the monthly average diurnal cycles for CO2. For each day the 24-hour average CO2 mixing ratio at the 496 m level has been subtracted from every observation for that day. Columns are: 1=YEAR, 2=MO, 3=HR 4= 50%ile, 5= 16%ile, 6= 84%ile, 7= N ( 51 m) 8= 50%ile, 9= 16%ile, 10= 84%ile, 11= N ( 123 m) 12= 50%ile, 13= 16%ile, 14= 84%ile, 15= N ( 496 m) 4.4 itn1997.hr.rdn Files contain the 30 min average radon data. The times give in the file are the middle of the averaging period. The four columns of data are radon concentrations in picoCuries per liter (pCi/L) for the 1, 51, 123, and 496 m levels. Missing data are assigned -9.9999. 5.0 References Bakwin, P.S., C. Zhao, W. Ussler, III, P.P. Tans, and E. Quesnell, Measurements of carbon dioxide on a very tall tower, Tellus, 47B, 535-549, 1995. 6.0 Attribution These data are freely available for use by anyone. We ask that you provide proper attribution. Depending on how you use our data this may be simply an acknowledgment, or it could be that we should be included as co-authors on your paper. Please contact Peter Bakwin (pbakwin@cmdl.noaa.gov, 303-497-6773) so that we can discuss appropriate use of the data and attribution. If you want to use the carbon monoxide (CO) data you should contact Dale Hurst (dhurst@cmdl.noaa.gov, 303-497-7003).