NASA/TMm2000-209891, Vol. 204

Technical Report Series on the

Boreal Ecosystem-Atmosphere Study (BOREAS)

Forrest G. Hall and Karl Huemmrich, Editors

Volume 204

BOREAS TF-8 NSA-OJP and

SSA-OBS Ceilometer Data

Kathleen E. Moore and David R. Fitzjarrald

State University of New York, Albany

National Aeronautics and

Space Administration

Goddard Space Flight Center

Greenbelt, Maryland 20771

November 2000

https://ntrs.nasa.gov/search.jsp?R=20010024151 2018-05-14T18:57:53+00:00Z
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NASA/TMm2000-209891, Vol. 204

Technical Report Series on the

Boreal Ecosystem-Atmosphere Study (BOREAS)

Forrest G. Hall and Karl Huemmrich, Editors

Volume 204

BOREAS TF-8 NSA-OJP and

SSA-OBS Ceilometer Data

Kathleen E. Moore and David R. Fitzjarrald

State University of New York, Albany

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 TF-8 NSA-OJP and SSA-OBS Ceilometer Data

Kathleen E. Moore, David R. Fitzjarrald

Summary

The BOREAS TF-8 team used ceilometers to collect data on the fraction of the sky covered with clouds

and the cloud height. Included with these data is the surface-based lifting condensation level, derived

from temperature and humidity values acquired at the flux tower at the NSA-OJP site. Ceilometer data

were collected at the NSA-OJP site in 1994 and at the NSA-OJP and SSA-OBS sites in 1996. The data

are available 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 TF-08 NSA-OJP and SSA-OBS Ceilometer Data

1.2 Data Set Introduction

Ceilometers emit pulses of laser light and measure the time it takes for the photons to return after

being scattered off of the cloud base. The ceilometer provides data on cloud base height and cloud

cover. The cloud fraction is the time fraction of cloud cover based on ceilometer reports every minute

(30 per half hour). The BOReal Ecosystem-Atmosphere Study (BOREAS) Tower Flux (TF)-08 team

collected these data to obtain a seasonal record of cloud fraction and cloud type. Data were collected at

the Northern Study Area (NSA)-Old Jack Pine (OJP) site in 1994 and at the NSA-OJP and Southern

Study Area (SSA)-Old Black Spruce (OBS) sites in 1996.

1.3 Objective/Purpose

The objective was to collect information on cloud characteristics in conjunction with tower flux

measurements.

Page 1
1.4 Summary of Parameters

Measurements include fraction of cloud cover, the height of the cloud base, backscatter range, and

the lifting condensation level. In 1996, cloud heights and backscatter ranges were reported for two

cloud layers.

1.5 Discussion

Ceilometers were located near the flux towers to measure the fraction of cloud cover and the height

of the cloud base. In 1994 a single Belfort ceilometer operated at the NSA-OJP site. That ceilometer

collected data from 31-May-1994 to 20-Sep-1994. In 1996, two Vaisala ceilometers were used, one at

the NSA-OJP, the other at the SSA-OBS site. The NSA-OJP ceilometer operated from 03-Jun-1996 to

10-Nov- 1996. The SSA-OB S ceilometer operated from 14-Jul- 1996 to 17-Oct- 1996.

1.6 Related Data Sets

BOREAS AFM-05 Level-2 Upper-Air Network Standard Pressure Level Data

BOREAS AFM-06 NOAA/ETL 35-GHz Cloud/Turbulence Radar GIF Images

BOREAS TF-08 NSA-OJP Tower Flux, Meteorological, and Soil Temperature Data

BOREAS TF-03 NSA-OBS Tower Flux, Meteorological, and Soil Temperature Data

2. Investigator(s)

2.1 Investigator(s) Name and Title

David R. Fitzjarrald

Research Associate

Atmospheric Sciences Research Center

Kathleen E. Moore

Research Scientist

Atmospheric Sciences Research Center

2.2 Title of Investigation

Surface Exchange Observations in the Canadian Boreal Forest Region

2.3 Contact Information

Contact 1:

Kathleen E. Moore

Research Scientist

Atmospheric Sciences Research Center

251 Fuller Rd.

Albany, NY 12203

(518) 437-8732

(518) 437-8758 (fax)

moore@ asrc.cestm.albany.edu

Contact 2:

David R. Fitzjarrald

Research Associate

Atmospheric Sciences Research Center

251 Fuller Rd.

Albany, NY 12203

(518) 437-8735

(518) 437-8758 (fax)

ritz@ asrc.cestm.albany.edu

Page 2
Contact 3:

K. Fred Huemmrich

University of Maryland

Code 923

NASA GSFC

Greenbelt, MD 20771

(301) 286-4862

(301) 286-0239 (fax)

Karl.Huemmrich@gsfc.nasa.gov

3. Theory of Measurements

The operating principle of the laser ceilometer is based on measuring the time needed for a short pulse

of light to traverse the distance through the atmosphere from the transmitter of the ceilometer to a

backscattering cloud base and back to the ceilometer's receiver. From that time measurement, the

height of the cloud base is calculated. The instantaneous magnitude of the return signal provides

information on the backscatter properties of the atmosphere at a certain height. The cloud fraction is the

time fraction of cloud cover based on ceilometer reports every minute (30 per half hour).

4. Equipment

4.1 Sensor/Instrument Description

4.1.1 Collection Environment

Measurements were collected at the NSA-OJP site from late May through mid-September 1994 and

early June through mid-November of 1996. At the SSA-OBS site, data were collected from mid-June

through mid-October of 1996. Over the entire time period of data collection, temperature conditions

from less than -15 °C to over 30 °C were experienced, as well as both rain and snow.

4.1.2 Source/Platform

The ceilometers were placed on wooden platforms. The platforms were less than 0.5 m off the

ground and within 25 m of the flux towers.

4.1.3 Source/Platform Mission Objectives

The objective was to provide stable and level support for the ceilometer.

4.1.4 Key Variables

The ceilometers measured fraction of cloud cover, the height of the cloud base, and backscatter

range. In 1996, cloud heights and backscatter ranges were reported for two cloud layers. The cloud

fraction was the time fraction of cloud cover based on ceilometer reports every minute (30 per half

hour). The surface-based lifting condensation level was derived from temperature and humidity values

acquired at 22.68 m above ground level on the NSA-OJP flux tower.

4.1.5 Principles of Operation

The Belfort ceilometer used a 20-watt near-infrared Gallium-Arsenide laser operating at a

wavelength of 0.91 microns. It employed 1,024 range gates, which yielded a vertical resolution of

7.62 m (25 feet) up to a maximum altitude of 7,802 m (25,600 feet). The fields of view of the

transmitter and receiver were approximately 1°. The time interval between consecutive observations

was set at 1 minute.

The Vaisala CT12K ceilometer digitally sampled the return signal every 100 ns and had a vertical

resolution of 15.24 m (50 feet) from ground level to an altitude of 3,901 m (12,500 feet).

Page 3
4.1.6 Sensor/Instrument Measurement Geometry

The ceilometers sat on a wooden platform within openings in the forest canopy allowing an

unobstructed view of the sky.

4.1.7 Manufacturer of Sensor/Instrument

Belfort Instrument Company

727 South Wolfe Street

Baltimore, MD 21231

USA

(410) 342-2626

(410) 342-7028 (fax)

http://www.belfort-inst.com/

Vaisala Inc.

U.S. Office

100 Commerce Way

Woburn, MA 01801-1068

USA

(781) 933-4500

4.2 Calibration

4.2.1 Specifications

None given.

4.2.1.1 Tolerance

The Belfort ceilometer had a vertical resolution of 7.62 m (25 feet), and the Vaisala CT12K

ceilometer had a vertical resolution of 15.24 m (50 feet).

4.2.2 Frequency of Calibration

Unknown.

4.2.3 Other Calibration Information

None given

5. Data Acquisition Methods

For each ceiling observation, the Belfort ceilometer goes through a cycle of measurements. The laser is

fired 5,120 times, and the reflected signal is sampled for each range gate. On each of the 5,120 scans,

for each range gate, the signal is compared with the appropriate noise level for that gate. Depending on

whether the received signal is above, below, or within the noise level band, an integer value of 1, -1,

or zero is assigned to that gate. These assigned integers are then summed for each gate and thus

represent a modified histogram of counts versus height. A peak-location algorithm is then applied to

this product to produce a first-order estimate of the cloud ceiling.

For the Vaisala CT12K ceilometer, the return signal strength is derived from the Lidar Equation. A

threshold for the backscatter coefficient (a measure of reflection) is based upon assumed visibilities in

cloud being in the range of 15 to 150 m.

Page 4
6.1 Data Notes

None.

6.2 Field Notes

None.

6. Observations

7. Data Description

7.1 Spatial Characteristics

7.1.1 Spatial Coverage

The ceilometers measured cloud conditions at a single point. In 1994, data were collected only at

NSA-OJP; in 1996, data were collected at both NSA-OJP and SSA-OBS sites. The ceilometers were

located within 25 m of the flux towers. The North American Datum of 1983 (NAD83) coordinates for

the sites were:

Latitude Longitude Elevation

NSA-OJP tower 55. 92842 ° N 98.62396 ° W 255.1 m

SSA-OBS tower 53. 98717 ° N 105.11779 ° W 628.9 m.

7.1.2 Spatial Coverage Map

Not applicable.

7.1.3 Spatial Resolution

The ceilometer laser was aimed vertically and the fields-of-view of the transmitter and receiver

were approximately 1°.

7.1.4 Projection

Not applicable.

7.1.5 Grid Description

Not applicable.

7.2 Temporal Characteristics

7.2.1 Temporal Coverage

In 1994, a single Belfort ceilometer operated at the NSA-OJP. That ceilometer collected data from

31-May-1994 to 20-Sep-1994. In 1996, two Vaisala ceilometers were used, one at the NSA-OJP, the

other at the SSA-OBS. The NSA-OJP ceilometer operated from 03-Jun-1996 to 10-Nov-1996. The

S SA-OB S ceilometer operated from 14-Jul- 1996 to 17-Oct- 1996.

7.2.2 Temporal Coverage Map

Not applicable.

7.2.3 Temporal Resolution

The time interval between consecutive observations was set at 1 minute for the Belfort ceilometer.

The Vaisala CT12K ceflometer digitally sampled the return signal every 100 ns. The cloud fraction was

the time fraction of cloud cover based on ceilometer reports every minute (30 per half hour).

One-minute ceflometer data and 20-minute lifting condensation level data were interpolated to the

half-hour averages provided in the data set.

Page 5
7.3 Data Characteristics

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

TIME OBS

MEAN CLOUD COVER

CLOUD HEIGHT LOWEST

CLOUD HEIGHT SECOND

BACKSCATTER RANGE FIRST LAYER

BACKSCATTER RANGE SECOND LAYER

LIFTING CONDENSATION LEVEL

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

TIME OBS

MEAN CLOUD COVER

CLOUD HEIGHT LOWEST

CLOUD HEIGHT SECOND

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 Greenwich Mean Time (GMT) of the start of the

data collection.

The fraction of sky covered by clouds, based on

ceilometer reports every minute averaged to a

half hourly value.

The lowest observed cloud base height. If

multiple layers of clouds are observed, this

is the height of the cloud base of the lower

clouds.

If multiple layers of clouds are observed, this

is the height of the cloud base of the second

lowest cloud layer.

BACKSCATTER RANGE FIRST LAYER The range of backscatter in the first cloud layer

BACKSCATTER RANGE SECOND LAYER The range of backscatter in the second cloud

layer.

Page 6
LIFTING CONDENSATION LEVEL

CRTFCN CODE

REVISION DATE

The surface-based lifting condensation level,

derived from temperature and humidity values

acquired at the 22.68 m level on the flux tower.

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 [none]

SUB SITE [none]

DATE OBS [DD-MON-YY]

TIME OBS [HHMM GMT]

MEAN CLOUD COVER [fraction]

CLOUD HEIGHT LOWEST [meters]

CLOUD HEIGHT SECOND [meters]

BACKSCATTER RANGE FIRST LAYER [i000 kilometers^-l] [steradians^-l]

BACKSCATTER RANGE SECOND LAYER [i000 kilometers^-l] [steradians^-l]

LIFTING CONDENSATION LEVEL [meters]

CRTFCN CODE [none]

REVISION DATE [DD-MON-YY]

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

TIME OBS

MEAN CLOUD COVER

CLOUD HEIGHT LOWEST

CLOUD HEIGHT SECOND

BACKSCATTER RANGE FIRST LAYER

[Assigned by BORIS.]

[Assigned by BORIS.]

[Supplied by Investigator.]

[Supplied by Investigator.]

[Ceilometer]

[Ceilometer]

[Ceilometer]

[Ceilometer]

BACKSCATTER RANGE SECOND LAYER [Ceilometer]

LIFTING CONDENSATION LEVEL [psychrometer]

CRTFCN CODE [Assigned by BORIS.]

REVISION DATE [Assigned by BORIS.]

Page 7
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-OJP-FLXTR SSA-OBS-FLXTR None None None None

SUB SITE 9TF08-CEILO 9TF08-CEILO None None None None

DATE OBS 31-MAY-94 10-NOV-96 None None None None

TIME OBS 0 2330 None None None None

MEAN CLOUD COVER 0 1 -999 None None None

CLOUD HEIGHT LOWEST 0 7315.2 -999 None None None

CLOUD HEIGHT SECOND 0 3810 -999 None None Blank

BACKSCATTER RANGE 0 12600 -999 None None Blank

FIRST LAYER

BACKSCATTER RANGE 0 500 -999 None None Blank

SECOND LAYER

LIFTING CONDENSATION 0 3971.77 -999 None None Blank

LEVEL

CRTFCN CODE CPI CPI None None None None

REVISION DATE 17-FEB-99 17-FEB-99 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 8
7.4 Sample Data Record

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

SITE NAME,SUB SITE,DATE OBS,TIME OBS,MEAN CLOUD COVER, CLOUD HEIGHT LOWEST,

CLOUD HEIGHT SECOND,BACKSCATTER RANGE FIRST LAYER,

BACKSCATTER RANGE SECOND LAYER, LIFTING CONDENSATION LEVEL,CRTFCN CODE,

REVISION DATE

'NSA-OJP-FLXTR', '9TF08-CEILO',01-AUG-96,0, .i,2646.68,-999.0,50.0,-999.0,2450.76,

'CPI',I7-FEB-99

'NSA-OJP-FLXTR', '9TF08-CEILO',01-AUG-96,100,0.0,0.0,0.0,0.0,0.0,2491.06, 'CPI',

17-FEB-99

8. Data Organization

8.1 Data Granularity

The smallest unit of data tracked by the BOREAS Information System (BORIS) was data collected

at a given site on a given date.

8.2 Data Format

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

None.

9.1.1 Derivation Techniques and Algorithms

None given.

9.2 Data Processing Sequence

9.2.1 Processing Steps

BORIS staff processed these data by:

• Reviewing the initial data files and loading them online for BOREAS team access.

• Designing relational data base tables to inventory and store the data.

• Loading the data into the relational data base tables.

• Working with the team to document the data set.

• Extracting the data into logical files.

9.2.2 Processing Changes

None.

9.3 Calculations

Page 9
9.3.1 Special Corrections/Adjustments

One-minute ceilometer data and 20-minute lifting condensation level data were interpolated to

half-hour averages.

9.3.2 Calculated Variables

The surface-based lifting condensation level was derived from temperature and humidity values

acquired at 22.68 m above ground level on the NSA-OJP flux tower. The cloud fraction was the time

fraction of cloud cover based on ceilometer reports every minute (30 per half hour).

9.4 Graphs and Plots

None.

10. Errors

10.1 Sources of Error

None given.

10.2 Quality Assessment

None given.

10.2.1 Data Validation by Source

None given.

10.2.2 Confidence Level/Accuracy Judgment

None given.

10.2.3 Measurement Error for Parameters

The Belfort ceilometer had a vertical resolution of 7.62 m (25 feet), and the Vaisala CT12K

ceilometer had a vertical resolution of 15.24 m (50 feet).

10.2.4 Additional Quality Assessments

None given.

10.2.5 Data Verification by Data Center

Data were examined to check for spikes, values that were four standard deviations from the mean,

long periods of constant values, and missing data.

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 given.

11. Notes

Page 10
12. Application of the Data Set

The ceilometer data provide a continuous record of cloud conditions that can be linked with surface

observations of heat and moisture fluxes measured from the flux towers.

None.

13. Future Modifications and Plans

14.1 Software Description

None given.

14.2 Software Access

None.

14. Software

15. Data Access

The NSA-OJP and SSA-OBS ceilometer 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 11
16. Output Products and Availability

16.1 Tape Products

None.

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

None given.

17.2 Journal Articles and Study Reports

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.

17.3 Arehive/DBMS Usage Documentation

None.

None.

18. Glossary of Terms

Page 12
ASCII

BOREAS

BORIS

CD-ROM

DAAC

EOS

EOSDIS

GIS

GMT

GSFC

HTML

IFC

NAD83

NASA

NOAA

NSA

OBS

OJP

ORNL

PANP

SSA

TF

TGB

URL

19. List of Acronyms

- American Standard Code for Information

- 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

- Greenwich Mean Time

- Goddard Space Flight Center

- HyperText Markup Language

- Intensive Field Campaign

- North American Datum of 1983

- National Aeronautics

- National Oceanic and

- Northern Study Area

- Old Black Spruce

- Old Jack Pine

- Oak Ridge National Laboratory

- Prince Albert National Park

- Southern Study Area

- Tower Flux

- Trace Gas Biogeochemistry

- Uniform Resource Locator

Interchange

and Space Administration

Atmospheric Administration

20.

20.1 Document Revision Date

Written: 06-May- 1999

Revised: 25-Oct- 1999

20.2 Document Review Date(s)

BORIS Review: 07-May- 1999

Science Review:

20.3 Document ID

Document Information

20.4 Citation

When using these data, please include the following acknowledgment as well as citations of

relevant papers in Section 17.2:

These data were provided by Drs. David R. Fitzjarrald and Kathleen E. Moore.

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

Fitzjarrald, D.R. and K.E. Moore, "Surface Exchange Observations in the Canadian Boreal Forest

Region." 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.

Page 13
Also,citetheBOREASCD-ROMsetas:

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, andP.Sellers,eds.CollectedDataof

TheBorealEcosystem-AtmosphereStudy.NASA. CD-ROM.NASA, 2000.

20.5 Document Curator

20.6 Document URL

Page 14
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 TF-8 NSA-OJP and SSA-OBS Ceilometer Data

6. AUTHOR(S)

Kathleen E. Moore and David R. Fitzjarrald

Forrest G. Hall and Karl Huemmrich, 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. 204

11. SUPPLEMENTARY NOTES

K.E. Moore and D.R. Fitzjarrald: State University of New York, Albany;

K. Huemmrich: University of Maryland, NASA Goddard Space Flight Center, Greenbelt, Maryland

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 TF-8 team used ceilometers to collect data on the fraction of the sky covered with

clouds and the cloud height. Included with these data is the surface-based lifting condensation level,

derived from temperature and humidity values acquired at the flux tower at the NSA-OJP site. Ceilometer data were collected at the NSA-OJP site in 1994 and at the NSA-OJP and SSA-OBS sites in

1996. The data are available in tabular ASCII files.

14. SUBJECT TERMS

BOREAS, tower flux, ceilometer data.

17. SECURITY CLASSIFICATION

OF REPORT

Unclassified

NSN 7540-01-280-5500

18. SECURITY CLASSIFICATION

OF THIS PAGE

Unclassified

19. SECURITY CLASSIFICATION

OF ABSTRACT

Unclassified

15. NUMBER OF PAGES

14

16. PRICE CODE

20. LIMITATION OF ABSTRACT

UL

Standard Form 298 (Rev. 2-89)

Prescribed by ANSI Std. Z39.18

298-102