Lindenberg (CSE BALTEX) Data Set for CEOP - EOP 1 (July 01, 2001 - September 30, 2001) Filenames and -type The data set consists of 15 different ascii text files (*.csv type). Filenames are chosen according to the convention proposed in June, 2002 by Steve Williams as lindenberg_startdate_enddate_ID which means for EOP 1 lindenberg_20010701_20010930_ID where ID indicates the type of data included (see below): Structure The first line in each file is a header indicating the parameters included. Each line contains parameters taken at a specific measurement time (or during a specific time interval) and at a specific measurement height, respectively (which means that the same time stamp may occur for more than one line in a data set). Individual parameters in one line are given in variable formats separated by a semicolon (;), except for the last parameter (no ";" at end-of-line). This format is frequently called CSV format. Each line starts with the measurement time (format: yyyy-mm-dd hh:mm) given in UTC. General convention If data are missing (or have not passed a quality check) no value or symbol is inserted in the files, i.e., there may occur a sequence of data separators without any numbers in between. File contents ID = synop: Surface standard data Parameter Unit Notes ------------------------------------------------------ Time UTC end of the averaging interval Air temperature C measured at 2 m height Relative humidity % measured at 2 m height Wind direction deg measured at 12.5 m height Wind speed m/s measured at 10 m height Air pressure hPa Station pressure (75 m above NN) Precipitation mm ID = radiation: Surface radiation data Parameter Unit Notes ----------------------------------------------------------------- Time UTC end of the averaging interval Downward shortwave radiation W/m2 Upward (reflected) shortwave radiation W/m2 Downward longwave radiation of the sky W/m2 Upward longwave (terrestrial) radiation of the surface W/m2 Downward photosynthetically active radiation uMol/(m2 s ) Upward photosynthetically active Radiation uMol/(m2 s) Surface Skin Temperature degC Note: missing for EOP1, but will be provided for EOP 2 and 3 Remark: All data values are positive along the direction of the measured flux density. There is a shortcoming in the data of upwelling longwave radiation. The upper acceptance limit was set too low in the MOL automatic data control procedures. The missing data thus occur on a few hot (clear) days in summer 2001. It is basically linked to high surface temperatures, but these occur -of course- with high insolation. MOL has corrected this threshold in their QC procedures in the meantime, so this type of missing data will not occur in the future for the data from EOP-2 and EOP-3. However, MOL has not yet recalculated the "old" 2001 data. ID = fluxes: Surface flux data Parameter Unit Notes ------------------------------------------------------- Time UTC end of the averaging interval Friction velocity m/s Sensible heat flux W/m2 minus means downward flux Latent heat flux W/m2 minus means downward flux The momentum flux (friction velocity) and sensible heat flux data are based on eddy-covariance measurements at 2.4 m height, while the latent heat flux presently is calculated to close the surface energy budget. At a later stage, this flux will also be provided from eddy-covariance measurements. Flux data are only given if they pass a number of quality checks. Agreement on this has still to be achieved within CEOP. ID = gsoil: Soil heat flux data Parameter Unit Notes ------------------------------------------------------ Time UTC end of the averaging interval Measurement depth m standard is - 5 cm Soil heat flux W/m2 minus means downward flux ID = tsoil: Soil temperature data Parameter Unit Notes ------------------------------------------------------- Time UTC end of the averaging interval Measurement depth m standard levels: -5, -10, -20, -50, -100, -150 cm Soil temperature degC ID = qsoil: Soil moisture data Parameter Unit Notes ---------------------------------------------------------------------------- Time UTC end of the averaging interval Measurement depth m standard levels: -8, -15, -30, -45, -60 cm Soil moisture Volume percent ID = raso_TempA: Upper air / Radiosonde data, Standard pressure levels Parameter Unit Notes -------------------------------------------------- Time UTC synoptic reference time Pressure hPa Geopotential height gpm Air temperature degC Relative humidity % Wind direction deg Wind speed m/s ID = raso_Tq: Upper air / Radiosonde data, Specific temperature levels Parameter Unit Notes --------------------------------------------------- Time UTC synoptic reference time Pressure hPa Geopotential height gpm Air temperature degC Relative humidity % ID = Raso_V: Upper air / Radiosonde data, Specific wind levels Parameter Unit Notes --------------------------------------------------- Time UTC synoptic reference time Pressure hPa Geopotential height gpm Wind direction deg Wind speed m/s ID = raso_hires: Upper air / Radiosonde data, high-resolution data Parameter Unit Notes ------------------------------------------------- Time UTC synoptic reference time Pressure hPa Geopotential height gpm Air temperature C Relative humidity % Wind direction deg Wind speed m/s The time resolution for this data is 10 seconds for temperature and humidity, and 30 seconds for the wind. ID = TRASS: Upper air / RASS data, Temperature profiles Parameter Unit Notes --------------------------------------------------------------------- Time UTC synoptic reference time Vertical resolution m Height m above NN (station height = 101 m) Averaging time interval minutes Virtual temperature degC ID = WPR: Upper air / Windprofiler data Parameter Unit Notes --------------------------------------------------------------------- Time UTC synoptic reference time Vertical resolution m Height m above NN (station height = 101 m) Averaging time interval minutes Wind direction deg Wind speed m/s A note on the Wind profiler / RASS data (ID = TRASS and WPR): The present data set contains so-called "low mode" data. These provide for a higher vertical resolution and higher precision but cover only part of the troposphere (up to 5 or 6 km height). "High mode" data extend to typically 10 or 12 km height, however with lower vertical resolution and precision. In principle, also "high mode" data are available at Lindenberg. ID = MWR: Upper air / Microwave radiometer data These data can not be provided for EOP1, since the instrument was at a field campaign at a different site during this time period, but will be available for EOP2 and EOP3. ID = ceilo: Upper air / ceilometer data Parameter Unit Notes -------------------------------------------------------- Time UTC synoptic reference time Cloud layer number without Height of cloud layer m above ground level ID = tower: Standard meteorological data from tower measurements Parameter Unit Notes -------------------------------------------------------- Time UTC end of the averaging interval Height m standard levels: 40 m, 98 m agl Air temperature degC Relative humidity % Wind direction deg Wind speed m/s Lindenberg data for CEOP - EOP1: Description, Version 03, as of 30 Nov 2002