SITE AVERAGED NEUTRON SOIL MOISTURE: 1987 (BETTS) Dataset Document

Summary:

   The Site Averaged Neutron Soil Moisture Data: 1987 (Betts) Data Set
   contains the site averaged product data of the neutron probe soil
   moisture collected during the 1987-1989 FIFE experiment. Samples were
   averaged for each site, then averaged for each day. This data set
   includes only 1987 data.

Table of Contents:

    1. Data Set Overview
    2. Investigator(s)
    3. Theory of Measurements
    4. Equipment
    5. Data Acquisition Methods
    6. Observations
    7. Data Description
    8. Data Organization
    9. Data Manipulations
   10. Errors
   11. Notes
   12. Application of the Data Set
   13. Future Modifications and Plans
   14. Software
   15. Data Access
   16. Output Products and Availability
   17. References
   18. Glossary of Terms
   19. List of Acronyms
   20. Document Information

1. Data Set Overview:

  Data Set Identification:

   SITE AVERAGED NEUTRON SOIL MOISTURE DATA: 1987 (BETTS).

  Data Set Introduction:

   This data set is a site-averaged product of the neutron probe soil
   moisture data collected during the 1987-1989 FIFE experiment. Samples
   were averaged for each site, and then each site was interpolated to
   give a value for each day. Then the sites were averaged for each day.

  Objective/Purpose:

   Information not available.

  Summary of Parameters:

   Heat flux, soil heat budget, and soil heat flux.

  Discussion:

   The Soil Moisture Site averages contain neutron probe data, converted
   by FIS to a volumetric value, using individual sample density. These
   values are a profile down to 200 cm if the tube went that deep (i.e.,
   no rock).

   Samples were averaged for each site (which often had 5 tubes), and
   then each site was interpolated to give a value for each day (and to
   fill in missing days). Then the sites were averaged for each day. Data
   levels are 200, 180, 160, 140, 120, 100, 80, 60, 50, 40, 30, and 20 cm
   and the 2 volumetric values for 2.5 and 7.5 cm converted from
   gravimetric measurements. For 20 and 100 cm the count (k) of sites has
   been included along with a sum of the actual number of measurements to
   indicate data density on that day. A blank value means no actual
   observations; Value is all interpolation.

   The 20 cm level data is suspect. The range of neutron probe exceeds 20
   cm in dry soil. The 20 cm data has different characteristics in 1987
   to 1988; it is inconsistent with the profile in 1987 but not in 1988.
   A change of measurement protocol is suspected, but the documents show
   nothing so it is only hearsay.

   The 1989 neutron data is so infrequesntly sampled that the average
   should be used with caution.

   This data was retrieved directly from the Oak Ridge DAAC. All the
   originating data, however, should correspond to that on CD-ROM Volume
   1, dated May 22, 1994, in directory soilmstr\sm_neut.

  Related Data Sets:

     * Site Averaged Neutron Soil Moisture Data: 1988 (Betts)
     * Site Averaged Neutron Soil Moisture Data: 1989 (Betts)
     * Site Averaged Neutron Soil Moisture Data: 1987 - 1989 (Betts)

2. Investigator(s):

  Investigator(s) Name and Title:

   Alan K. Betts and John H. Ball
   Atmospheric Research,
   RR#3, Box 3125
   Pittsford VT 05763 Telephone: (802) 483-2087
   Fax: (802) 483-6167
   Email: akbetts@aol.com

  Title of Investigation:

   FIFE Follow-On.

  Contact Information:

   ORNL DAAC User Services Office
   P.O. Box 2008
   MS 6407
   Oak Ridge National Laboratory
   Oak Ridge, TN 37831-6407
   USA

   Telephone: 1-(423)-241-3952
   Fax: 1-(423)-574-4665
   Email: ornldaac@ornl.gov

  Requested Form of Acknowledgment.

   You may use these files freely. Please send Alan Betts
   (akbetts@aol.com) an e-mail if you do, so he can notify you of any
   updates. Please notify both Alan Betts and the ORNL DAAC of any errors
   you find.

   This data processing was supported by NASA under Contract NAS5-32356
   to Alan Betts, and an acknowledgment of the years of work that went
   into the production of these files would be appreciated in
   publications based substantially on them.

   The FIFE CD-ROM can be cited as D. E. Strebel, D. R. Landis, K. F.
   Huemmrich, and B. W. Meeson (1994), Collected Data of The First ISLSCP
   Field Experiment, Vol. 1: Surface Observations and Non-Image Data
   Sets.

3. Theory of Measurements:

   Information not available.

4. Equipment:

  Sensor/Instrument Description:

   ANALYSIS:
          The process of an individual examining the information
          collected during a scientific investigation. Often this takes
          the form of reviewing and working with output from modeling
          activities to give meaning to the information.

    Collection Environment:

   Ground-based.

    Source/Platform:

   Field Investigation.

    Source/Platform Mission Objectives:

   Information not available.

    Key Variables:

   Information not available.

    Principles of Operation:

   Information not available.

    Sensor/Instrument Measurement Geometry:

   Information not available.

    Manufacturer of Sensor/Instrument:

   Information not available.

  Calibration:

   Information not available.

5. Data Acquisition Methods:

   Information not available.

6. Observations:

   Information not available.

7. Data Description:

  Spatial Characteristics:

    Spatial Coverage:

   The center of the FIFE 15x15 km site is close to 39.05þN, 96.53þW.

    Spatial Coverage Map:

   Not available.

    Spatial Resolution:

   These are point data.

    Projection:

   Information not available.

    Grid Description:

   Information not available.

  Temporal Characteristics:

    Temporal Coverage:

   This data set is a time series of daily values for the period between
   May 28, 1987- November 6, 1987.

    Temporal Coverage Map:

   Not available.

    Temporal Resolution:

   Time index is Julian day.

  Data Characteristics:

    Parameter/Variable:

          Soil Moisture,

    Variable Description/Definition:

          Soil Moisture:

   Table 1. contains a summary of the variables in this data set.
                  Table 1. Variable Description

Variable Name  Long Name               SAS Type  Description
  __________________________________________________________________________

1  Jul_Date                            8         "Julian date (day of year 1-36
6)"
2  SM200                               8         "Average % soil moisture at de
pth
                                                  of 200 cm"
3  SM180                               8         "Average % soil moisture at de
pth
                                                  of 180 cm"
4  SM160                               8         "Average % soil moisture at de
pth
                                                  of 160 cm"
5  SM140                               8         "Average % soil moisture at de
pth
                                                  of 140 cm"
6  SM120                               8         "Average % soil moisture at de
pth
                                                  of 120 cm"
7  SM100                               8         "Average % soil moisture at de
pth
                                                  of 100 cm"
8  SM100_k                             8         "Number of sites included in
                                                  average soil moisture at dept
h
                                                  of 100 cm (SM100)"
9  SM100sum                            8         "Sum of soil moisture
                                                  measurements at depth of 100
cm"
10 SM80                                8         "Average % soil moisture at de
pth
                                                  of 80 cm"
11 SM60                                8         "Average % soil moisture at de
pth
                                                  of 60 cm"
12 SM50                                8         "Average % soil moisture at de
pth
                                                  of 50 cm"
13 SM40                                8         "Average % soil moisture at de
pth
                                                  of 40 cm"
14 SM30                                8         "Average % soil moisture at de
pth
                                                  of 30 cm"
15 SM20                                8         "Average % soil moisture at de
pth
                                                  of 20 cm"
16 SM20_k                              8         "Number of sites included in
                                                  average soil moisture at dept
h
                                                  of 20 cm  (SM20)"
17 SM20sum                             8         "Sum of soil moisture
                                                  measurements at depth of 20 c
m"
18 SM7_5v                              8         "Volumetric soil moisture for
                                                  depth of 7.5 cm converted fro
m
                                                  gravimetric measurements"
19 SM2_5v                              8         "Volumetric soil moisture for
                                                  depth of 2.5 cm converted fro
m
                                                  gravimetric measurements"
20 SM2_5vk                             8         "Number of gravimetric
                                                  measurements at 2.5 cm includ
ed
                                                  in volumetric conversion"
21 obs_date                            8         "Observation date (mm/dd/yyyy)
"
     _________________________________________________________________

    Unit of Measurement:

   Refer to Table 1.

    Data Source:

   Meteorological Station.

    Data Range:

   Information not available.

  Sample Data Record:

Jul_Date, SM200,  SM180,  SM160,  SM140,   SM120,   SM100, SM100_k, SM100sum,
SM80,   SM60,   SM50,   SM40,   SM30,   SM20,   SM20_k, SM20sum, SM7_5v, SM2_5v
, SM2_5vk, obs_date
  __________________________________________________________________________

148,       .,       .,      .,    23.25,   25.95,   27.38,    1,       6,
27.97,  29.67,  30.65,  31.33,  31.47,  30.65,    1,       5,     45,      44.6
,
1,      05/28/1987

149,     35.1,    35.42,  34.55,  32.42,   33.7,    34.17,    5,      16,
34.5,   36.73,  37.6,   38.13,  37.93,  31.6,     6,      20,     41.22,   41.4
,
10,     05/29/1987

150,     34.11,   34.46,  34.29,  33.62,   34.38,   34.52,   15,      29,
35.27,  36.92,  37.61,  37.87,  37.11,  29.62,   16,      37,     37.01,   38.9
2,
29,     05/30/1987

151,     34.03,   34.33,  34.2,   33.62,   34.3,    34.43,   15,       .,
35.17,  36.77,  37.45,  37.63,  36.64,  28.55,   16,       .,     35.93,   36.6
2,
29,     05/31/1987

8. Data Organization:

  Data Granularity:

         File names          size (bytes)

         ffoneut87.dat        18000

  Data Format:

   Data levels are 200, 180, 160, 140, 120, 100, 80, 60, 50, 40, 30, and
   20 cm. The 2 volumetric values for 2.5 and 7.5 cm are converted from
   gravimetric measurements. A count (k) of sites along with a sum of the
   actual number of measurements to indicate data density on that day is
   included for the 20 and 100 cm levels.

   A blank value indicates no actual observations; value is all
   interpolation.

9. Data Manipulations:

   Information not available.

10. Errors:

  Sources of Error:

   Information not available.

  Quality Assessment:

    Data Validation by Source:

   Information not available.

    Confidence Level/Accuracy Judgment:

   Irregularity of sampling is the biggest problem with the soil moisture
   data. During dry spells and between IFC's sampling was less frequent,
   and this smoothes the time series considerably.

    Measurement Error for Parameters:

   Information not available.

    Additional Quality Assessments:

   Information not available.

    Data Verification by Data Center:

   Information not available.

11. Notes:

  Limitations of the Data:

   Not available.

  Known Problems with the Data:

   The 20 cm level data is suspect. Range of neutron probe exceeds 20 cm
   in dry soil. The 20 cm data has different characteristics in 1987 to
   1988; it is inconsistent with the profile in 1987 but not in 1988. A
   change of measurement protocol is suspected, but the documents show
   nothing so it is only hearsay.

   The 1989 neutron data is so fragmentary that it is still being
   considered.

  Usage Guidance:

   Information not available.

  Any Other Relevant Information about the Study:

   Information not available.

12. Application of the Data Set:

   Information not available.

13. Future Modifications and Plans:

   There are no plans to revisit this data; but let us know of errors.

14. Software:

   Information not available.

15. Data Access:

  Contact Information:

   ORNL DAAC User Services
   P.O. Box 2008
   Mail Stop 6407
   Oak Ridge National Laboratory
   Oak Ridge, TN 37831-6407

   Telephone: (423) 241-3952
   FAX: (423) 574-4665

   Email: ornldaac@ornl.gov

  Data Center Identification:

   EOSDIS Distributed Active Archive Center
   P.O. Box 2008
   Mail Stop 6407
   Oak Ridge National Laboratory
   Oak Ridge, TN 37831-6407
   USA

   Telephone: (423) 241-3952
   FAX: (423) 574-4665

   Email: ornldaac@ornl.gov

  Procedures for Obtaining Data:

   Users may place requests by letter, telephone, electronic mail, FAX,
   or personal visit. Data is also available via the World Wide Web at
   http://www-eosdis.ornl.gov.

  Data Center Status/Plans:

   FIFE data are available from the ORNL DAAC. Please contact the ORNL
   DAAC User Services Office for the most current information about these
   data.

16. Output Products and Availability:

   This data set is available online via the World Wide Web at
   http://www-eosdis.ornl.gov/BIOME/biome.html, or telnet
   ornlims.ornl.gov 6493 (128.219.24.108 6493), or eosims.ornl.gov 12345
   (128.219.24.108 12345)

17. References:

   Betts and Ball, 1997: FIFE surface climate and site-average data set
   1987-1989, J. Atmos. Sci. In press (3rd FIFE special issue)

   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 dataset: 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 (November 1992) contains many
   important refs by the PI's who collected this data

  Archive/DBMS Usage Documentation.

   Contact the EOS Distributed Active Archive Center (DAAC) at Oak Ridge
   National Laboratory (ORNL), Oak Ridge, Tennessee (see the Data Center
   Identification Section). Documentation about using the archive and/or
   online access to the data at the ORNL DAAC is not available at this
   revision.

18. Glossary of Terms:

   A general glossary for the DAAC is located at
   http://cdiac.esd.ornl.gov/cdiac/glossary.html.

19. List of Acronyms:

   ESD
          Environmental Sciences Division (Oak Ridge National Laboratory)

   FTP
          File Transfer Protocol

   NASA
          National Aeronautics and Space Administration

   ORNL
          Oak Ridge National Laboratories, Oak Ridge, Tennessee, USA

   URL
          Uniform Resource Locator

   A general list of acronyms for the DAAC is available at
   http://www-eosdis.ornl.gov/acronyms.html.

20. Document Information:

  Document Revision Date:

   December 4, 1996.

  Document Review Date:

   May 19, 1997.

  Document ID:

   FIFE_FFONEU87.

  Citation:

   Betts, A.K., 1994. Site Averaged AMS Data: 1987 (BETTS) Follow-On to
   the First ISLSCP Field Experiment. Available on CD-ROM and on-line
   [http://www-eosdis.ornl.gov] from the ORNL Distributed Active Archive
   Center, Oak Ridge National Laboratory, Oak Ridge, Tennessee, U.S.A.

  Document Curator:

   Donna O. Lambert
   dlambert@daacs.esd.ornl.gov

  Document URL:
     _________________________________________________________________


    FIFE Home Page | Oak Ridge DAAC Home Page | ORNL Home Page
    ORNL DAAC User Services Office: 423-241-3952; email
    ornldaac@ornl.gov
    Web Document Curator: Sarah Jennings, xqj@ornl.gov
    Document Editor: Donna Lambert
    Revision Date: March 12, 1998
    URL: http://www-eosdis.ornl.gov
    /FIFE/Follow_On/guides/Betts_neut_soil_mstr_87.html