BOREAS RSS-18 Sunphotometer Data over the SSA The BOREAS RSS-18 team collected ground-based sunphotometer data in support of AVIRIS remote sensing activities at the SSA. The following information was compiled by staff members of the BOReal Ecosystem-Atmosphere Study (BOREAS) Information System (BORIS) as part of their data documentation efforts. Contact Information Jim Conel (RSS-18 Sunphotometer contact) James.E.Conel@jpl.nasa.gov Jaime Nickeson (BORIS contact) Raytheon ITSS NASA GSFC Greenbelt, MD (301) 286-3373 (301) 286-0239 (fax) Jaime.Nickeson@gsfc.nasa.gov Methods Personnel from the Remote Sensing Science (RSS) team number 18 (RSS-18) collected data with various sunphotometer instruments at ground sites in the Southern Study Area (SSA). The collected data were later processed at the Jet Propulsion Laboratory (JPL) and some of the data and supporting information were sent to BORIS. Data File Descriptions: The RSS-18 team sent 6 files to BORIS for each data acquisition: 1. General Information (yymmddb.lis) 2. Langley plot files in postscript format (yymmddb.ps) 3. Ratio values of channels 8/9 (yymmddb_ratio.dat) 4. Instantaneous optical depth for all channels (yymmddb_taui.dat) 5. Instantaneous aerosol tau for all channels (yymmddb_tmie.dat) 6. Columnar water abundance (yymmddb_water.dat) where yy = year (94 means 1994), mm = month, dd = day, b = B sun photometer, and c = C sun photometer The data are stored in the files as ASCII text. The data in the files represent the reduced sun photometer data collected during BOREAS IFC1 and IFC3 at the SSA Old Jack Pine (OJP), Old Black Spruce (OBS), and Old Aspen (OA) sites. The data values are based on calibrated voltage intercepts. The center wavelengths of the sunphotometer instrument channels are: ch=[380,398,438,520,606,668,781,869,938,1028] ; sun photometer B ch=[381,400,441,520,609,669,781,869,939,1029] ; sun photometer C BOREAS - IFC1 Date/Inst Site Latitude (North) Longitude (West) 940529C OJP 53:54.41 104:40.05 940531B OJP 53:54.36 104:41.15 940531C OJP 53:54.26 104:40.33 940601B OJP 53:54.25 104:41.01 940601C OJP 53:54.19 104:40.81 940604B OJP 53:54.13 104:41.60 940604C OJP 53:54.22 104:41.08 940606B OBS 53:58.00 105:08.60 940606C OBS 53:57.71 105:07.98 940611B OA 53:37.61 106:10.52 BOREAS - IFC3 Date/Inst Site Latitude (North) Longitude (West) 940912B OBS,am 53:58.04 105:08.56 unable to process 940912C OBS,am 53:58.04 105:08.56 unable to process 940913B OBS,am 53:58.04 105:08.56 940913C OBS,am 53:58.04 105:08.56 940916B OBS,am 53:59.89 105:07.97 940916C OBS,am 53:59.89 105:07.97 940917B OA,am 53:37.66 106:10.48 The note of ‘unable to process’ for the data collected on 940912 means that the airmass range was not sufficient for optical depth reduction. Other data were acquired at the SSA calibration site but the data have not been provided to BORIS. Contact RSS-18 personnel regarding these data. Contact for Data Center/Data Access Information: These BOREAS data are available from the Earth Observing System Data and Information System (EOS-DIS) Oak Ridge National Laboratory (ORNL) Distributed Active Archive Center (DAAC). The BOREAS contact at ORNL is: ORNL DAAC User Services Oak Ridge National Laboratory (865) 241-3952 ornldaac@ornl.gov ornl@eos.nasa.gov Procedures for Obtaining Data: BOREAS data may be obtained through the ORNL DAAC World Wide Web site at http://www-eosdis.ornl.gov/ or users may place requests for data by telephone, electronic mail, or fax. Output Products and Availability: Requested data can be provided electronically on the ORNL DAAC's anonymous FTP site or on various media including, CD-ROMs, 8-MM tapes, or diskettes. The complete set of BOREAS data CD-ROMs, entitled "Collected Data of the Boreal Ecosystem-Atmosphere Study", edited by Newcomer, J., et al., NASA, 1999, are also available. RSS18_Sunphoto.doc 06/09/99