NASA/TMm2000-209891, Vol. 246

Technical Report Series on the

Boreal Ecosystem-Atmosphere Study (BOREAS)

Forrest G. Hall and Sara K. Conrad, Editors

Volume 246

BOREAS TGB-12 222Rn Flux Data

over the NSA

Susan Trumbore, University of California, Irvine

Eric Sundquist and Greg Winston, U.S. Geological Survey, Woods Hole, Massachusetts

National Aeronautics and

Space Administration

Goddard Space Flight Center

Greenbelt, Maryland 20771

November 2000

https://ntrs.nasa.gov/search.jsp?R=20010022906 2018-05-14T19:06:13+00:00Z
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NASA/TMm2000-209891, Vol. 246

Technical Report Series on the

Boreal Ecosystem-Atmosphere Study (BOREAS)

Forrest G. Hall and Sara K. Conrad, Editors

Volume 246

BOREAS TGB-12 222Rn Flux Data

over the NSA

Susan Trumbore, University of California, Irvine

Eric Sundquist and Greg Winston, U.S. Geological Survey, Woods Hole, Massachusetts

National Aeronautics and

Space Administration

Goddard Space Flight Center

Greenbelt, Maryland 20771

November 2000
NASA Center for AeroSpace Information

7121 Standard Drive

Hanover, MD 21076-1320

Price Code: A17

Available from:

National Technical Information Service

5285 Port Royal Road

Springfield, VA 22161

Price Code: A10
BOREAS TGB-12 222Rn Flux Data over the NSA

Susan Trumbore, Eric Sundquist, Greg Winston

Summary

The BOREAS TGB- 12 team made measurements of soil carbon inventories, carbon concentration in

soil gases, and rates of soil respiration at several sites to estimate the rates of carbon accumulation and

turnover in each of the major vegetation types. Sampling strategies for soils were designed to take

advantage of local fire chronosequences, so that the accumulation of carbon in new moss growth could

be determined. All the data are used to 1) calculate the inventory of carbon and nitrogen in moss and

mineral soil layers at NSA sites, 2) determine the rates of input and turnover (using both accumulation

since the last stand-killing fire and radiocarbon data), and 3) link changes in soil respiration rate to

shifts in the 14C content of soil CO2 to determine the average 'age' respired CO2. These 222Rn flux

data were collected from 15-Nov-1993 to 16-Aug-1994 over the NSA sites. The data in this data set

are stored in tabular ASCII files.

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

1.1 Data Set Identification

BOREAS TGB- 12 222Rn Flux Data over the NSA

1.2 Data Set Introduction

This data set contains fluxes of 222Rn emitted from soils. Radon is a noble gas produced from the

radioactive decay of 226Ra, which is present in the Lake Aggasiz sediments underlying the BOReal

Ecosystem-Atmosphere Study (BOREAS) Northern Study Area (NSA) soils. Radon is itself

radioactive, with a half-life of 3.8 days. It is used as a tracer of soil-atmosphere gas exchange. The

data presented represent sampling from the fall of 1993 to the summer of 1994.

Page 1
1.3 Objective/Purpose

The objective of these data is to estimate rates of carbon input, turnover, and accumulation in the

soils of each of the major vegetation types at the BOREAS study sites. In addition, the data will be

used to relate the estimates of soil carbon dynamics to ecosystem models of the carbon cycle, other

measures of carbon cycling dynamics, regional models of soil carbon accumulation, and spatial and

temporal models of soil moisture and drainage.

1.4 Summary of Parameters

222Rn flux and soil depth were measured over the BOREAS NSA.

1.5 Discussion

Radon flux data, together with the concentration profile of radon in soil air, may be used to

estimate effective diffusivity of gases in soil air, or to test models that predict effective diffusivity

based on data such as air-filled porosity. See Davidson and Trumbore (1995) as an example, and for

more detail about methods and sampling approaches used here.

1.6 Related Data Sets

BOREAS TGB-12 222Rn Activity Data over the NSA

BOREAS

BOREAS

BOREAS

BOREAS

BOREAS

BOREAS

BOREAS

TGB-12 Isotopic Carbon Dioxide Data over the NSA

TGB-05 Fire History of Manitoba 1980 to 1991 in Raster Format

TE- 18 Landsat TM Physical Classification Image of the NSA

AFM-12 1-kin AVHRR Seasonal Land Cover Classification

Regional Soils Data in Raster Format and AEAC Projection

Soils Data over the SSA in Raster Format and AEAC Projection

TGB-01 Soil CH4 and CO2 Profile Data over the NSA

2. Investigator(s)

2.1 Investigator(s) Name and Title

Susan Trumbore

Department of Earth System Science

UC Irvine

Jennifer Harden

U.S. Geological Survey

Menlo Park, CA

Eric Sundquist

U.S. Geological Survey

Woods Hole, MA

2.2 Title of Investigation

Input, Accumulation and Turnover of Carbon in BOREAS NSA Soils (TGB-12)

Page 2
2.3 Contact Information

Contact 1:

Susan Trumbore

Department of Earth System Science

University of California

Irvine, CA 92697-3100

(714) 824-6142

(714) 824-3256 (fax)

setrumbo@uci.edu

Contact 2:

Greg Winston

U.S. Geological Survey

Quisett Campus

Woods Hole, MA 02543

Winston@nobska.wr.usgs.edu

Contact 3:

Eric Sundquist

U.S. Geological Survey

Quisett Campus

Woods Hole, MA 02543

(508) 457-2397

sundquist@nobska.wr.usgs.gov

Contact 4:

Jeffrey A. Newcomer

Raytheon ITSS

Code 923

NASA GSFC

Greenbelt, MD 20771

(301) 286-7858

(301) 286-0239 (fax)

Jeffrey.Newcomer@ gsfc.nasa.gov

3. Theory of Measurements

A static chamber method was used to determine radon fluxes. Chambers are described in Winston et

al. (1997) and problems with chamber sampling in Stephens and Sundquist (1998). After chamber

emplacement, samples of chamber air were taken at intervals of 30 to 45 minutes and used to fill

pre-evacuated Lucas counting cells. The flux is determined from the slope of radon activity versus

time. Special pits were instrumented with thermistors (for monitoring soil temperature), Time Domain

Reflectometry (TDR) probes (for monitoring soil water content), and soil gas probes (1/8" stainless

steel tubing, perforated at one end and inserted 50 to 100 cm laterally into the soil pit wall, capped with

1/8" swagelock union fittings sealed with a septum). Further details are given in Winston et al. (1997)

and in Section 4, below.

222Rn gas samples were obtained using gas-tight syringes (60 cc), dried (by passing through

drierite), and then allowed to fill an evacuated Lucas counting cell coated with phosphor scintillant and

decay counted. A description of radon sampling and analysis procedures is given in Davidson and

Trumbore (1995).

Page 3
4. Equipment

4.1 Sensor/Instrument Description

Because all of the equipment used in this project is common to many other projects and no special

procedures were used, description detail has been minimized in this section, and the reader is referred

to the appropriate publications.

• Davidson and Trumbore, 1995

• Mathieu et al., 1988

• Stephens and Sundquist, 1998

• Winston et al., 1997

Radon measurements were made using Pylon alpha scintillation counters.

4.1.1 Collection Environment

Samples were collected under all environmental conditions. Most measurements represent winter

conditions.

4.1.2 Source/Platform

Soil.

4.1.3 Source/Platform Mission Objectives

The objective was to determine the soil 222Rn flux.

4.1.4 Key Variables

The key variables measured were 222Rn activity and soil depth. The 222Rn flux was calculated

from the collected 222Rn values.

4.1.5 Principles of Operation

None given.

4.1.6 Sensor/Instrument Measurement Geometry

Not applicable.

4.1.7 Manufacturer of Sensor/Instrument

None given.

4.2 Calibration

None given.

4.2.1 Specifications

None given.

4.2.1.1 Tolerance

None given.

4.2.2 Frequency of Calibration

None given.

4.2.3 Other Calibration Information

Radon cell efficiencies were determined in the lab using background air and 226Ra of known

activity absorbed to manganese fibers and sealed in a tube. Counting cell backgrounds were

determined using ambient air (see Davidson and Trumbore, 1995, and Mathieu, 1988, for details of

radon measurement methods).

Page 4
Nonegiven.

5. Data Acquisition Methods

6.1 Data Notes

None given.

6.2 Field Notes

None given.

6. Observations

7. Data Description

7.1 Spatial Characteristics

7.1.1 Spatial Coverage

The North American Datum of 1983 (NAD83) coordinates of the sites were:

NSA Old Black Spruce (OBS) :

NSA Old Jack Pine (OJP) :

NSA Young Jack Pine (YJP) :

NSA Gillam Road:

55.88007N, 98.48139W

55.92842N, 98.62396W

55.89575N, 98.28706 W

55.9055 N, 97.70872W

7.1.2 Spatial Coverage Map

Not available.

7.1.3 Spatial Resolution

The data are point source measurements made at the given locations.

7.1.4 Projection

Not applicable.

7.1.5 Grid Description

Not applicable.

7.2 Temporal Characteristics

7.2.1 Temporal Coverage

Soil gas flux and concentration measurements were made from November 1993 to August 1994.

7.2.2 Temporal Coverage Map

Not applicable.

7.2.3 Temporal Resolution

The temporal resolution of the measurements was variable. Some sites were visited once, and

others were visited multiple times.

7.3 Data Characteristics

Page 5
7.3.1 Parameter/Variable

The parameters contained in the data files on the CD-ROM are:

Column Name

SITE NAME

SUB SITE

DATE OBS

MEAN RADON222 FLUX

SDEV RADON222 FLUX

CRTFCN CODE

REVISION DATE

7.3.2 Variable Description/Definition

The descriptions of the parameters contained in the data files on the CD-ROM are:

Column Name Description

SITE NAME

SUB SITE

DATE OBS

MEAN RADON222 FLUX

SDEV RADON222 FLUX

CRTFCN CODE

REVISION DATE

The identifier assigned to the site by BOREAS, in

the format SSS-TTT-CCCCC, where SSS identifies

the portion of the study area: NSA, SSA, REG,

TRN, and TTT identifies the cover type for the

site, 999 if unknown, and CCCCC is the identifier

for site, exactly what it means will vary with

site type.

The identifier assigned to the sub-site by

BOREAS, in the format GGGGG-IIIII, where GGGGG is

the group associated with the sub-site

instrument, e.g. HYD06 or STAFF, and IIIII is the

identifier for sub-site, often this will refer to

an instrument.

The date on which the data were collected.

The mean RADON-222 flux measured in the winter

1993-1994 and summer 1994.

Standard deviation for the measured RADON flux

determined using a 95% confidence interval.

The BOREAS certification level of the data.

Examples are CPI (Checked by PI), CGR (Certified

by Group), PRE (Preliminary), and CPI-??? (CPI

but questionable).

The most recent date when the information in the

referenced data base table record was revised.

7.3.3 Unit of Measurement

The measurement units for the parameters contained in the data files on the CD-ROM are:

Column Name Units

SITE NAME

SUB SITE

DATE OBS

MEAN RADON222 FLUX

SDEV RADON222 FLUX

CRTFCN CODE

REVISION DATE

[none]

[none]

[DD-MON-YY]

[becquerel] [meter^-2] [minute^-l]

[becquerel] [meter^-2] [minute^-l]

[none]

[DD-MON-YY]

Page 6
7.3.4 Data Source

The sources of the parameter values contained in the data files on the CD-ROM are:

Column Name Data Source

SITE NAME

SUB SITE

DATE OBS

MEAN RADON222 FLUX

SDEV RADON222 FLUX

CRTFCN CODE

REVISION DATE

[BORIS Designation]

[BORIS Designation]

Investigator

Pylon alpha scintillation counters

Pylon alpha scintillation counters

[BORIS Designation]

[BORIS Designation]

7.3.5 Data Range

The following table gives information about the parameter values found in the data files on the

CD-ROM.

Minimum Maximum Missng Unrel Below Data

Data Data Data Data Detect Not

Column Name Value Value Value Value Limit Cllctd

SITE NAME NSA-999-GMR02 NSA-YJP-FLXTR None None None None

SUB SITE TGBI2-RDN01 TGBI2-RDN01 None None None None

DATE OBS 15-NOV-93 16-AUG-94 None None None None

MEAN RADON222 FLUX 0 2.92 None None None None

SDEV RADON222 FLUX .01 .39 None None None Blank

CRTFCN CODE CPI CPI None None None None

REVISION DATE 21-AUG-96 21-AUG-96 None None None None

Minimum Data Value -- The minimum value found in the column.

Maximum Data Value -- The maximum value found in the column.

Missng Data Value -- The value that indicates missing data. This is used to

indicate that an attempt was made to determine the

parameter value, but the attempt was unsuccessful.

Unrel Data Value -- The value that indicates unreliable data. This is used

to indicate an attempt was made to determine the

parameter value, but the value was deemed to be

unreliable by the analysis personnel.

Below Detect Limit -- The value that indicates parameter values below the

instruments detection limits. This is used to

indicate that an attempt was made to determine the

parameter value, but the analysis personnel determined

that the parameter value was below the detection

limit of the instrumentation.

Data Not Cllctd -- This value indicates that no attempt was made to

determine the parameter value. This usually

indicates that BORIS combined several similar but

not identical data sets into the same data base table

but this particular science team did not

measure that parameter.

Blank -- Indicates that blank spaces are used to denote that type of value.

N/A -- Indicates that the value is not applicable to the respective column.

None -- Indicates that no values of that sort were found in the column.

Page 7
7.4 Sample Data Record

The following are wrapped versions of data record from a sample data file on the CD-ROM.

SITE

REVISION DATE

NSA-OJP-FLXTR'

NSA-999-GMR02'

NSA-YJP-FLXTR'

NSA-OBS-FLXTR'

NSA-999-GMR02'

NSA-OBS-FLXTR'

NAME,SUB SITE,DATE OBS,MEAN RADON222 FLUX, SDEV RADON222 FLUX,CRTFCN CODE,

TGBI2-RDN01

TGBI2-RDN01

TGBI2-RDN01

TGBI2-RDN01

TGBI2-RDN01

TGBI2-RDN01

15-NOV-93, .41, .39,

16-NOV-93,1.65, .3,

18-NOV-93, .08, .05,

20-NOV-93,1.8, .26,

22-NOV-93, .29, .21,

23-JAN-94, .44, .13,

CPI

CPI

CPI

CPI

CPI

CPI

21-AUG-96

21-AUG-96

21-AUG-96

21-AUG-96

21-AUG-96

21-AUG-96

8. Data Organization

8.1 Data Granularity

The smallest unit of data is the 222Rn flux data for a given site on a given day.

8.2 Data Format(s)

The Compact Disk-Read-Only Memory (CD-ROM) files contain American Standard Code for

Information Interchange (ASCII) numerical and character fields of varying length separated by

commas. The character fields are enclosed with single apostrophe marks. There are no spaces between

the fields.

Each data file on the CD-ROM has four header lines of Hyper-Text Markup Language (HTML)

code at the top. When viewed with a Web browser, this code displays header information (data set

title, location, date, acknowledgments, etc.) and a series of HTML links to associated data files and

related data sets. Line 5 of each data file is a list of the column names, and line 6 and following lines

contain the actual data.

9. Data Manipulations

9.1 Formulae

9.1.1 Derivation Techniques and Algorithms

Methods for calculating radon activities and using them for estimating soil gas diffusivity are given

in Davidson and Trumbore (1995) and Trumbore (1995).

9.2 Data Processing Sequence

None given.

9.2.1 Processing Steps

None given.

9.2.2 Processing Changes

None given.

9.3 Calculations

None given.

9.3.1 Special Corrections/Adjustments

None given.

Page 8
9.3.2 Calculated Variables

None given.

9.4 Graphs and Plots

None given.

10. Errors

10.1 Sources of Error

Sources of error include inaccuracies in soil collection and instrument errors during running of

samples.

10.2 Quality Assessment

10.2.1 Data Validation by Source

There are many sources of error in flux measurements. The ones associated with the methods used

here are detailed in Stephens and Sundquist (1998). Errors involved in soil gas sampling include the

possibility that the volume of soil air space sampled (500 cc to 1 liter) represents a far larger volume of

soil. Thus, the depth assigned to a soil gas sample (i.e., the depth of the probe) may not represent the

average for the interval integrated in the gas sample taken from it (that is, air may be pulled down from

above or up from below). Only analytical errors are given in these data sets.

10.2.2 Confidence Level/Accuracy Judgment

For radon measurements, accuracy is 10% of the measured value, with most of the error caused by

uncertainty in the efficiency of the counting cell.

10.2.3 Measurement Error for Parameters

For radon measurements, accuracy is 10% of the measured value, with most of the error caused by

uncertainty in the efficiency of the counting cell.

10.2.4 Additional Quality Assessments

None.

10.2.5 Data Verification by Data Center

Data were examined for general consistency and clarity.

11.1 Limitations of the Data

None given.

11.2 Known Problems with the Data

None given.

11.3 Usage Guidance

None given.

11.4 Other Relevant Information

None.

1 1. Notes

Page 9
12. Application of the Data Set

The data can be used for estimation of soil gas exchange rates from 222Rn data (or testing of soil gas

exchange rates derived from models).

None given.

13. Future Modifications and Plans

14. Software

14.1 Software Description

Calculations of fluxes for radon used linear regression from programs such as Microsoft Excel and

Kaleidograph.

14.2 Software Access

None given.

15. Data Access

The TGB-12 222Rn flux data are available from the Earth Observing System Data and Information

System (EOSDIS) Oak Ridge National Laboratory (ORNL) Distributed Active Archive Center

(DAAC).

15.1 Contact Information

For BOREAS data and documentation please contact:

ORNL DAAC User Services

Oak Ridge National Laboratory

P.O. Box 2008 MS-6407

Oak Ridge, TN 37831-6407

Phone: (423) 241-3952

Fax: (423) 574-4665

E-mail: ornldaac@ornl.gov or ornl@eos.nasa.gov

15.2 Data Center Identification

Earth Observing System Data and Information System (EOSDIS) Oak Ridge National Laboratory

(ORNL) Distributed Active Archive Center (DAAC) for Biogeochemical Dynamics

http://www-eosdis.ornl.gov/.

15.3 Procedures for Obtaining Data

Users may obtain data directly through the ORNL DAAC online search and order system

[http://www-eosdis.ornl.gov/] and the anonymous FTP site [ftp://www-eosdis.ornl.gov/data/] or by

contacting User Services by electronic mail, telephone, fax, letter, or personal visit using the contact

information in Section 15.1.

15.4 Data Center Status/Plans

The ORNL DAAC is the primary source for BOREAS field measurement, image, GIS, and

hardcopy data products. The BOREAS CD-ROM and data referenced or listed in inventories on the

CD-ROM are available from the ORNL DAAC.

Page 10
16.1 Tape Products

None.

16. Output Products and Availability

16.2 Film Products

None.

16.3 Other Products

These data are available on the BOREAS CD-ROM series.

17. References

17.1 Platform/Sensor/Instrument/Data Processing Documentation

Not applicable.

17.2 Journal Articles and Study Reports

Davidson, E.A. and S.E. Trumbore. 1995. Gas diffusivity and production of CO2 in deep soils of the

eastern Amazon. Tellus. 47B: 550-565.

Mathieu, G.G., P.E. Biscaye, R.A. Lupton, and D.E. Hammond. 1988. System for measurement of

222Rn at low levels in natural waters. Heath Physics 55:989-992.

Newcomer, J., D. Landis, S. Conrad, S. Curd, K. Huemmrich, D. Knapp, A. Morrell, J. Nickeson,

A. Papagno, D. Rinker, R. Strub, T. Twine, F. Hall, and P. Sellers, eds. 2000. Collected Data of The

Boreal Ecosystem-Atmosphere Study. NASA. CD-ROM.

Sellers, P. and F. Hall. 1994. Boreal Ecosystem-Atmosphere Study: Experiment Plan. Version

1994-3.0, NASA BOREAS Report (EXPLAN 94).

Sellers, P. and F. Hall. 1996. Boreal Ecosystem-Atmosphere Study: Experiment Plan. Version

1996-2.0, NASA BOREAS Report (EXPLAN 96).

Sellers, P., F. Hall, and K.F. Huemmrich. 1996. Boreal Ecosystem-Atmosphere Study: 1994

Operations. NASA BOREAS Report (OPS DOC 94).

Sellers, P., F. Hall, and K.F. Huemmrich. 1997. Boreal Ecosystem-Atmosphere Study: 1996

Operations. NASA BOREAS Report (OPS DOC 96).

Sellers, P., F. Hall, H. Margolis, B. Kelly, D. Baldocchi, G. den Hartog, J. Cihlar, M.G. Ryan, B.

Goodison, P. Crill, K.J. Ranson, D. Lettenmaier, and D.E. Wickland. 1995. The boreal

ecosystem-atmosphere study (BOREAS): an overview and early results from the 1994 field year.

Bulletin of the American Meteorological Society. 76(9): 1549-1577.

Sellers, P.J., F.G. Hall, R.D. Kelly, A. Black, D. Baldocchi, J. Berry, M. Ryan, K.J. Ranson, P.M.

Crill, D.P. Lettenmaier, H. Margolis, J. Cihlar, J. Newcomer, D. Fitzjarrald, P.G. Jarvis, S.T.

Gower, D. Halliwell, D. Williams, B. Goodison, D.E. Wickland, and F.E. Guertin. 1997. BOREAS

in 1997: Experiment Overview, Scientific Results and Future Directions. Journal of Geophysical

Research 102(D24): 28,731-28,770.

Stephens, B.B. and E.T. Sundquist. 1998. Measurements of soil surface gas fluxes using closed

chamber techniques, submitted for publication.

Page 11
Trumbore, S.E. 1995. Use of isotopes and tracers in the study of emission and consumption of trace

gases in terrestrial environments. Chapter 9 in: Matson, P and Harriss, R, (eds.). Biogenic Trace

Gases: Measuring Emissions from Soil and Water, Blackwell, Oxford, p. 291-326.

Winston, G.C., E.T. Sundquist, B.B. Stephens, and S.E. Trumbore. 1997. Winter CO 2 fluxes in a

boreal forest. Journal of Geophysical Research 102(D24):28,795-28,804.

17.3 Archive/DBMS Usage Documentation

None.

None given.

18. Glossary of Terms

AEAC

AFM

AMS

ASCII

AVHRR

BOREAS

BORIS

CD-ROM

DAAC

EOS

EOSDIS

GIS

GSFC

HTML

IRGA

NAD83

NASA

NSA

OBS

OJP

ORNL

PANP

TDR

TGB

TM

SSA

URL

USGS

YJP

19. List of Acronyms

- Albers Equal-Area Conic

- Airborne Fluxes and Meteorology

- Accelerator Mass Spectrometry

- American Standard Code for Information Interchange

- Advanced Very High Resolution Radiometer

- BOReal Ecosystem-Atmosphere Study

- BOREAS Information System

- Compact-Disk-Read-Only Memory

- Distributed Active Archive Center

- Earth Observing System

- EOS Data and Information System

- Geographic Information System

- Goddard Space Flight Center

- Hyper-Text Markup Language

- Infrared Gas Analyzer

- North American Datum of 1983

- National Aeronautics and Space Administration

- Northern Study Area

- Old Black Spruce

- Old Jack Pine

- Oak Ridge National Laboratory

- Prince Albert National Park

- Time Domain Reflectometry

- Trace Gas Biogeochemistry

- Thematic Mapper

- Southern Study Area

- Uniform Resource Locator

- United Stated Geological Survey

- Young Jack Pine

Page 12
20. Document Information

20.1 Document Revision Date

Written: 14-Nov- 1997

Last Updated: 09-Jul- 1999

20.2 Document Review Date(s)

BORIS Review: 10-Ju1-1998

Science Review:

20.3 Document ID

20.4 Citation

For soils data, the U.S. Geological Survey (USGS) open file reports (see Section 17.2) should be

cited. For interpretations, cite submitted Journal of Geophysical Research papers (see Section 17.2).

Other citations should refer to the BOREAS Information System (BORIS) data set.

If using data from the BOREAS CD-ROM series, also reference the data as:

Trumbore, S., J. Harden, and E. Sundquist, "Input, Accumulation and Turnover of Carbon in

BOREAS NSA Soils (TGB- 12)." In Collected Data of The Boreal Ecosystem-Atmosphere Study.

Eds. J. Newcomer, D. Landis, S. Conrad, S. Curd, K. Huemmrich, D. Knapp, A. Morrell, J.

Nickeson, A. Papagno, D. Rinker, R. Strub, T. Twine, F. Hall, and P. Sellers. CD-ROM. NASA,

2000.

Also, cite the BOREAS CD-ROM set as:

Newcomer, J., D. Landis, S. Conrad, S. Curd, K. Huemmrich, D. Knapp, A. Morrell, J.

Nickeson, A. Papagno, D. Rinker, R. Strub, T. Twine, F. Hall, and P. Sellers, eds. Collected Data of

The Boreal Ecosystem-Atmosphere Study. NASA. CD-ROM. NASA, 2000.

20.5 Document Curator

20.6 Document URL

Page 13
REPORT DOCUMENTATION PAGE FormApproved

OMB No. 0704-0188

Public reporting burden for this collection of informationis estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources,

gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this

collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson

Davis Highway, Suite 1204, Arlington, VA 22202-4302, and to the Office of Management and Budget, Paperwork Reduction Project (0704-0188), Washington, DC 20503.

1. AGENCY USE ONLY (Leave blank) 2. REPORT DATE 3. REPORT TYPE AND DATES COVERED

November 2000 Technical Memorandum

4. TITLE AND SUBTITLE

Technical Report Series on the Boreal Ecosystem-Atmosphere Study (BOREAS)

BOREAS TGB-12 222Rn Flux Data over the NSA

6. AUTHOR(S)

Susan Trumbore, Eric Sundquist, and Greg Winston

Forrest G. Hall and Sara K. Conrad, Editors

7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS (ES)

Goddard Space Flight Center

Greenbelt, Maryland 20771

9. SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS (ES)

National Aeronautics and Space Administration

Washington, DC 20546-0001

5. FUNDING NUMBERS

923

RTOP: 923-462-33-01

8. PEFORMING ORGANIZATION

REPORT NUMBER

2000-03136-0

10. SPONSORING / MONITORING

AGENCY REPORT NUMBER

TM--2000-209891

Vol. 246

11. SUPPLEMENTARY NOTES

S. Trumbore: University of California, Irvine; E. Sundquist and G. Winston: U.S.G.S., Woods Hole,

Massachusetts; S.K. Conrad: Raytheon ITSS

12a. DISTRIBUTION / AVAILABILITY STATEMENT

Unclassifie_Unlimited

Subject Category: 43

Report available from the NASA Center for AeroSpace Information,

7121 Standard Drive, Hanover, MD 21076-1320. (301) 621-0390.

12b. DISTRIBUTION CODE

13. ABSTRACT (Maximum 200 words)

The BOREAS TGB-12 team made measurements of soil carbon inventories, carbon concentration in

soil gases, and rates of soil respiration at several sites to estimate the rates of carbon accumulation and

turnover in each of the major vegetation types. Sampling strategies for soils were designed to take

advantage of local fire chronosequences, so that the accumulation of carbon in new moss growth could

be determined. All the data are used to 1) calculate the inventory of carbon and nitrogen in moss and

mineral soil layers at NSA sites, 2) determine the rates of input and turnover (using both accumulation

since the last stand-killing fire and radiocarbon data), and 3) link changes in soil respiration rate to

shifts in the t4C content of soil CO 2 to determine the average 'age' respired CO 2. These 222Rn flux data

were collected from 15-Nov-1993 to 16-Aug-1994 over the NSA sites. The data in this data set are

stored in tabular ASCII files.

14. SUBJECT TERMS

BOREAS, trace gas biogeochemistry.

17. SECURITY CLASSIFICATION

OF REPORT

Unclassified

NSN 7540-01-280-5500

18. SECURITY CLASSIFICATION

OF THIS PAGE

Unclassified

19. SECURITY CLASSIFICATION

OF ABSTRACT

Unclassified

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13

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