FIFE BASELINE SURFACE FLUX DATA DOCUMENTATION: FIFE Site averaged data files: Summers of 1987, 1988, and 1989 (IFC-5 only). as data sets: Site Averaged Flux Data: 1987 (Betts) Site Averaged Flux Data: 1988 (Betts) Site Averaged Flux Data: 1989 (Betts) Site Averaged Flux Data: 1987-89 (Betts) ffo_flx.doc Date: June 13, 1996 First release KEY REFERENCE: Betts and Ball, 1997: FIFE surface climate and site-average data set 1987-1989, J. Atmos. Sci. (3rd FIFE special issue), In press. REVISION HISTORY: First Release: June 13,1996 ****We have no plans to revisit this data; but let us know of errors *** See also: FIFE Site Averaged AMS (Meteorology) Data as: Site Averaged AMS Data: 1987 (Betts) ffoams87.dat Site Averaged AMS Data: 1988 (Betts) ffoams88.dat Site Averaged AMS Data: 1989 (Betts) ffoams89.dat Site Averaged AMS Data: 1987-89 (Betts) ffo_ams.dat FIFE Site Averaged Gravimetric Soil Moisture Data: 1987-1989 (Betts) as: Site Avg. Grav. Soil Mstr: 1987 (Betts) ffogrv87.dat Site Avg. Grav. Soil Mstr: 1988 (Betts) ffogrv88.dat Site Avg. Grav. Soil Mstr: 1989 (Betts) ffogrv89.dat Site Avg. Grav. Soil Mstr: 87-89 (Betts) ffo_grv.dat FIFE Site Averaged Neutron Probe Soil Moisture Data: 1987-1989 (Betts) as: Site Avg. Neut. Soil Mstr: 1987 (Betts) ffoneu87.dat Site Avg. Neut. Soil Mstr: 1988 (Betts) ffoneu88.dat Site Avg. Neut. Soil Mstr: 1988 (Betts) ffoneu89.dat Site Avg. Neut. Soil Mstr: 87-89 (Betts) ffo_neu.dat Source: Alan K. Betts and John H. Ball Atmospheric Research, RR#3, Box 3125, Pittsford VT 05763. akbetts@aol.com 802 483-2087 (voice) 802 483-6167 (FAX) JUNE 13 1996 release File names size (bytes) approximate Zipped size ffoflx87.dat 932711 324991 ffoflx88.dat 827797 249742 ffoflx89.dat 151501 45642 ffo_flx.dat 1987330 626962 (data from all 3 years combined) 1.0 Origin of Data This data set is a site averaged product of the FLUX data collected by many PI's acquired during the 1987-1989 FIFE experiment. The raw data have been further editted before the site average was generated. The center of the FIFE 15x15 km site is close to 39.05þN, 96.53þW. Most of the data comes from the from the FIFE CD ROM Vol 1; or was retrieved directly from the Oak Ridge DAAC (Thanks to Merilyn Gentry). All the originating data however should correspond to that in the group 8, "Surface Meteorological Measurements (SUR_MET)" or FIFE CD-ROM Volume 1, dated May 22, 1994, in directories sur_flux\30-min and sur_flux\basel_92 . ***The one big exception is the 1988 Fritschen Flux data which had been mostly lost before archive and was retrieved directly from Leo Fritschen, and reprocessed by Betts and Ball. Our special thanks to Leo Fritschen for coming out of retirement to retrieve this data. It is a key component in the 1988 data. *** 2.0 Description of data sets (table) This data set is a time series of 30-min average variables for the periods ffoflx87.dat May 27, 1987 - Oct 16, 1987 (Year seq #;Rnet, LH, SH, Soilheat flux, SolDn,Solref,LWdn,LWup (each with a count and standard deviation); date (1), UTC.) ffoflx88.dat Apr 27, 1988 - Sept 20, 1988 (Year seq #;Rnet, LH, SH, Soilheat flux, SolDn,Solref (each with a count and standard deviation); date (1), UTC.) ffoflx89.dat July 21-Aug 16, 1989 ffo_flx.dat May 27, 1987 - August 16, 1989 [data from all 3 years combined] 2.1 Time index The time interval of the year is broken down into 30-min intervals. There is one variable sample at each 30 minute time interval so in a LEAP YEAR (NOTE 1988) there are 366 x 48 = 17658 time intervals. This field in the data base in named "YSq#" (Yearly Sequence #) and makes a convenient linear time scale; in addition to day and UTC. 2.2 Stations Selected Following discussions with the PI (Leo Fritschen), some late July ,early August,1987 data has been rejected , as well as all the data from Fritschen station #34 (3479-BRL)in 1987 which was on a slope and had shadowing problems. In 1988 and 1989 all stations have been included. 2.3 List of Variables Table 1. Is a summary of variables in this data set. Table 1. Variable Description Variable Name Long Name (FIS Name) SAS Type* Variable Description/Units 1 Ysq_no 8 "Time interval of the year broken down into 30-minute intervals" 2 Rnet NET_RADTN 8 "Average net radiation (W/m2)" 3 Rnet_k 8 "Number of sites included in average net radiation (Rnet)" 4 Rnet_s 8 "Standard deviation of average net radiation (Rnet)" 5 LH LATENT_HEAT_FLUX 8 "Average latent heat flux (W/m2)" 6 LH_s 8 "Standard deviation of average latent heat flux (LH)" 7 LH_k 8 "Number of sites included in average latent heat flux (LH)" 8 SH SENSIBLE_HEAT_FLUX 8 "Average sensible heat flux (W/m2)" 9 SH_s 8 "Standard deviation of average sensible heat flux (SH)" 10 SH_k 8 "Number of sites included in average sensible heat flux (SH)" 11 Soil SOIL_HEAT_FLUX 8 "Average soil heat flux (W/m2)" 12 Soil_s 8 "Standard deviation of average soil heat flux (Soil)" 13 Soil_k 8 "Number of sites included in average soil heat flux (Soil)" 14 SolDn TOTAL_INCIDENT_RADTN 8 "Average total incident radiation (W/m2)" 15 SolDn_s 8 "Standard deviation of average total incident radiation (SolDn)" 16 SolDn_s 8 "Number of sites included in average total incident radiation (SolDn)" 17 SolRef SHORTWAVE_SOLAR_REFL 8 "Average shortwave solar reflectance (W/m2)" 18 SolRef_s 8 "Standard deviation of average shortwave solar reflectance (SolRef)" 19 SolRef_k 8 "Number of sites included in average shortwave solar reflectance (SolRef)" 20 LWDn (1987) LONG_WAVE_DOWN 8 "Average longwave down (W/m2)" 21 LWDn_s 8 "Standard deviation of average longwave down (LWDn)" 22 LWDn_k 8 "Number of sites included in average longwave down (LWDn)" 23 LWup (1987) LONG_WAVE_UP 8 "Average longwave up (W/m2)" 24 LWup_s 8 "Standard deviation of average longwave up (LWup)" 25 LWup_k 8 "Number of sites included in average longwave up (LWup)" 26 Jul_Date 8 "Julian date (day of year 1-366)" 27 UTC 8 "Decimal time" 28 obs_date 8 "Observation date (mm/dd/yyyy)" 29 obs_time 8 "Observation time (hhmm)" 30 year 8 "Year" [ffo_flx.dat only] * SAS Type: 8 = Numeric Variable SAS Type: $ n = Character Variable of Length n The data definition file (*.def) accompanying each data set provides the exact list of variables included in the data set. The data files are comma delimited ASCII files and contain a header line listing the data fields included in the file. The comprehensive list of variables above is provided for general information only. 3. Data Quality THE QUALITY OF THE fLUX DATA IS QUITE GOOD. Each variable (for all sites), together with the site -average and standard deviation were then examined graphically and manually (and iteratively) edited to eliminate bad data; and generate a cleaned-up site average for each variable. Some bad data has escaped this process; often this is indicated by a solitary extreme standard deviation. However the heterogeneity between sites is considable; from vallies to ridgetop When there are only a few sites such as July 24-Aug 3,1987, the "quality" of the site-average is poorer. Acknowledgment. You may use these files freely. Please send me (Alan Betts) an e-mail if you do, so I can notify you of any updates. Please notify me of any errors you find. This data processing was supported by NASA under Contract NAS5-32356 to Alan Betts, and an acknowledgment of the work (both by the original PI's and by myself)that went into the data collection and the production of these files would be appreciated in publications based substantially on them. The FIFE CD-ROM can be cited as Strebel et al (1994). 4.References. Betts, A.K., J.H. Ball, and A.C.M. Beljaars, 1993: Comparison between the land surface response of the European Centre model and the FIFE-1987 data. Q.J.R.M.S., 119, 975-1001. Betts, A.K. and J.H. Ball, 1994: Budget analysis of FIFE-1987 sonde data. J.G.R., 99, 3655-3666. Betts, A.K. and J.H. Ball, 1995: The FIFE surface diurnal cycle climate. J.G.R. 100, 25679-25693. Betts A. K. And J. H. Ball, 1997: FIFE surface climate and site-average data set: 1987-1989. (FIFE special issue 3 J. Atmos. Sci. in press) Strebel, D. E., D. R. Landis, K. F. Huemmrich, and B. W. Meeson, 1994: Collected data of the First ISLSCP Field Experiment, in Surface Observations and non-image data sets., Vol 1, CD-ROM, NASA GSFC, Greenbelt, MD 20771 The First FIFE special issue in JGR, 97, (November, 1992) contains many important refs by the PI's who collected this data