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Investigation:

CD-03 (Fitzjarrald / Moraes)

LBA Dataset ID:

LBA_CD03_CEILOMETER

Originator(s):

CZIKOWSKY, M.J.

Point(s) of Contact:

ORNL DAAC User Services Office Oak Ridge National Laboratory Oak Ridge, Tennessee 37 (ornldaac@ornl.gov)

Dataset Abstract:

A Vaisala CT-25K ceilometer was installed at an old-growth forest site located at the km 67 Eddy Flux Tower site in the Tapajos National Forest, Para, Brazil, off Kilometer 67 of BR-163 south of Santarem in April 2001 and remained operational through December 2003, with reliable data being collected between May 2001 and June 2003.
Annual, 2001 to 2003, 30-minute average cloud base and backscatter profile data and measurement statistics (sample count, variance, skewness, and kurtosis) are presented in 15 ASCII comma-delineated files. In addition, the cloud base values (m) and measurement statistics for the three reported cloud base levels have been consolidated in 3 annual comma-separated files.
The ceilometer provides 15-second measurements of cloud base (three levels up to 7500 m), echo intensity, and a 30-m resolution backscatter profile. The ceilometer reports vertical visibility during periods when the sky is obscured but a cloud base is not detectable. The ceilometer was operational for a sufficient amount of time to examine wet-to-dry season variations in cloud cover fraction and cloud base height.

Beginning Date:

2001-04-07

Ending Date:

2003-12-22

Metadata Last Updated on:

2009-09-29

Data Status:

Archived

Access Constraints:

PUBLIC

Data Center URL:

http://daac.ornl.gov/

Distribution Contact(s):

ORNL DAAC User Services Office Oak Ridge National Laboratory Oak Ridge, Tennessee 37 (ornldaac@ornl.gov)

Access Instructions:

PUBLIC

Data Access:

IMPORTANT: The LBA-ECO Project website is no longer being supported. Links to external websites may be inactive. Final data products from the LBA project can be found at the ORNL DAAC. Please follow the fair use guidelines found in the dataset documentation when using or citing LBA data.
Datafile(s):

LBA-ECO CD-03 Cloud Base-Backscatter Data, km 67 Tower Site, Tapajos National Forest:  http://daac.ornl.gov/cgi-bin/dsviewer.pl?ds_id=942

Documentation/Other Supporting Documents:

LBA-ECO CD-03 Cloud Base-Backscatter Data, km 67 Tower Site, Tapajos National Forest:  http://daac.ornl.gov/LBA/guides/CD03_Ceilometer_Km67.html

Citation Information - Other Details:

Czikowsky, M.J. 2009. LBA-ECO CD-03 Cloud Base-Backscatter Data, km 67 Tower Site, Tapajos National Forest. Data set. Available on-line [http://daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A. doi:10.3334/ORNLDAAC/942

Keywords - Theme:

Parameter Topic Term Source Sensor
AEROSOL BACKSCATTER ATMOSPHERE AEROSOLS GROUND-BASED OBSERVATION CEILOMETER
CLOUD BASE ATMOSPHERE CLOUDS GROUND-BASED OBSERVATION CEILOMETER

Uncontrolled Theme Keyword(s):  AEROSOL BACKSCATTER, CEILOMETER, CLOUD BASE

Keywords - Place (with associated coordinates):

Region
(click to view profile)
Site
(click to view profile)
North South East West
Pará Western (Santarém) km 67 Primary Forest Tower Site -2.85700 -2.85700 -54.95900 -54.95900

Related Publication(s):

Czikowsky, M.J. 2008. Observing transient characteristics of the components of the hydrological balance. Ph.D. Thesis SUNY, Albany.

Data Characteristics (Entity and Attribute Overview):

Data Characteristics:

Annual, 2001 to 2003, 30-minute average cloud base, backscatter profile data and measurement statistics (sample count, variance, skewness, and kurtosis) are presented in 15 ASCII comma-delineated files. There are several data gaps in each file that are noted in Section 4.



In addition, the cloud base values (m) and measurement statistics for the three reported cloud base levels have been consolidated in three annual comma-separated files.



Annual 30-minute average cloud base and backscatter profile data files:



For each year, the 30-minute average cloud base with backscatter and

 measurement statistics including the sample count, variance, skewness, and kurtosis are reported in separate ASCII comma-delineated files -- 5 files per year for a total of 15 files.



The data file naming structure follows this pattern:



CD03_Ceilometer_data-type_YYYY.csv



Where data-type will be Backscatter, Sample_Count, Variance, Skewness, or Kurtosis and YYYY will be 2001, 2002, or 2003.



For example: CD03_Ceilometer_Backscatter_2001.csv,CD03_Ceilometer_Variance_2002.csv, and CD03_Ceilometer_Kurtosis_2003.csv



Data file header and column descriptions:



Following is an example of the header for a Backscatter data file. Note that columns 5-7 contain the Cloud Base heights (m) that were derived from the backscatter profile measurements. Columns 8-258 are the 30-minute average backscatter values at the indicated heights.



For the Sample_Count, Variance, Skewness, and Kurtosis data types, the file structure is the same as Backscatter, but the values are the measurement statistics for the respective Backscatter value. For example, in CD03_Ceilometer_Sample_Count_2001.csv, columns 5-7 contain the Sample Count for Cloud Base height values at level 1, 2, and 3, respectively. Values in columns 8-258 are the number of 15-second measurements included in the respective 30-minute backscatter averagesat the indicated heights.



Example Backscatter data file header: (Headers are not shown for the other data types.)







Filename:CD03_Ceilometer_Backscatter_2001.csv



File creation date: 16-June-2008 Associated LBA



Data Set Inventory ID: CD03_Ceilometer_Km67



Moment 1 output file



File generated by ceilHexavg1.f - avg. per.= 30 min with post-processing using SAS to reformat data file as csv and remove padded blank spaces.







Column Number Heading Units/Formats Description

1 Year YYYY Year

2 Day Decimal day of year (GMT). Note: The values are the middle of the 30-minute averaging period. Local time is GMT-4.

3 Hour Decimal hour of the day (GMT). Note: The values are the middle of the 30-minute averaging period - 5.25 represents the average for the 05:00-05:30 time period.

4 Seconds Number of seconds into the day (GMT).

5 BS_Cloud_1 m Cloud base for level 1 (m) - (a value of -9999 indicates no cloud base was detected)

6 BS_Cloud_2 m Cloud base for level 2 (m) - (a value of -9999 indicates no cloud base was detected)

7 BS_Cloud_3 m Cloud base for level 3 (m) - (a value of -9999 indicates no cloud base was detected)

Cols 8-258 Backscatter_height 10000*srad*km Data are range and sensitivity normalized backscatter. There are 251 values, representing the average of 15 second backscatter measurements from 0 to 25000 feet at 100-foot (~30 m) resolution. The first value (column 8) is the backscatter at a height of 0 feet, column 9 is the backscatter at a height of 100 feet, and column 258 is the backscatter at 25000 feet.



Example data file records:



Note that 258 columns will not load completely into an Excel 2003 spread sheet because of the 256 column limit. Excel 2007 has no such limit.



Backscatter:



Header records omitted



Year,Day,Hour,Seconds,BS_Cloud_1,BS_Cloud_2,BS_Cloud_3,Backscatter_0ft,Backscatter_100ft,

Backscatter_200ft,Backscatter_300ft,Backscatter_400ft,Backscatter_500ft,Backscatter_600ft,

Backscatter_700ft,Backscatter_800ft,Backscatter_900ft,Backscatter_1000ft,Backscatter_1100ft,

...

,Backscatter_24000ft,Backscatter_24100ft,Backscatter_24200ft,Backscatter_24300ft,

Backscatter_24400ft,Backscatter_24500ft,Backscatter_24600ft,Backscatter_24700ft,

Backscatter_24800ft,Backscatter_24900ft,Backscatter_25000ft



2001,121.947914,22.75,81900,3992.88,-9999,-9999,2.41,1.48,1,1,0,0,0,0,0,0,0,0,

...

0.04,-0.04,-0.07,0,-0.04,0,0.07,-0.04,0,0.07,0.07



Sample Count:



Header records omitted



Year,Day,Hour,Seconds,SC_Cloud_1,SC_Cloud_2,SC_Cloud_3,Sample_Count_0ft,Sample_Count_100ft,

Sample_Count_200ft,Sample_Count_300ft,Sample_Count_400ft,Sample_Count_500ft,Sample_Count_600ft,

Sample_Count_700ft,Sample_Count_800ft,Sample_Count_900ft,Sample_Count_1000ft,Sample_Count_1100ft,

...

,Sample_Count_24000ft,Sample_Count_24100ft,Sample_Count_24200ft,Sample_Count_24300ft,

Sample_Count_24400ft,Sample_Count_24500ft,Sample_Count_24600ft,Sample_Count_24700ft,

Sample_Count_24800ft,Sample_Count_24900ft,Sample_Count_25000ft



2001,121.947914,22.75,81900,1,0,0,27,27,27,27,27,27,27,27,27,27,27,27,

...

27,27,27,27,27,27,27,27,27,27,27





Variance:



Header records omitted



Year,Day,Hour,Seconds,V_Cloud_1,V_Cloud_2,V_Cloud_3,Variance_0ft,Variance_100ft,

Variance_200ft,Variance_300ft,Variance_400ft,Variance_500ft,Variance_600ft,

Variance_700ft,Variance_800ft,Variance_900ft,Variance_1000ft,Variance_1100ft,

...

,Variance_24000ft,Variance_24100ft,Variance_24200ft,Variance_24300ft,

Variance_24400ft,Variance_24500ft,Variance_24600ft,Variance_24700ft,

Variance_24800ft,Variance_24900ft,Variance_25000ft



2001,121.947914,22.75,81900,-9999,-9999,-9999,0.57,0.51,0,0,0,0,0,0,0,0,0,0,

...

0.19,0.19,0.27,0.28,0.19,0,0.38,0.19,0,0.27,0.27







Skewness:



Header records omitted



Year,Julian_day,Hour,Seconds,Skew_Cloud_1,Skew_Cloud_2,Skew_Cloud_3,Skewness_0ft,Skewness_100ft,

Skewness_200ft,Skewness_300ft,Skewness_400ft,Skewness_500ft,Skewness_600ft,

Skewness_700ft,Skewness_800ft,Skewness_900ft,Skewness_1000ft,Skewness_1100ft,

...

,Skewness_24000ft,Skewness_24100ft,Skewness_24200ft,Skewness_24300ft,

Skewness_24400ft,Skewness_24500ft,Skewness_24600ft,Skewness_24700ft,

Skewness_24800ft,Skewness_24900ft,Skewness_25000ft



2001,121.947914,22.75,81900,-9999,-9999,-9999,0.94,0.07,-9999,-9999,-9999,-9999,-9999,-9999,-9999,

-9999,-9999,-9999,

...

4.63,-4.63,-3.07,0,-4.63,-9999,4.63,-4.63,-9999,3.07,3.07



Kurtosis:



Header records omitted



Year,Julian_day,Hour,Seconds,Kurt_Cloud_1,Kurt_Cloud_2,Kurt_Cloud_3,Kurtosis_0ft,Kurtosis_100ft,

Kurtosis_200ft,Kurtosis_300ft,Kurtosis_400ft,Kurtosis_500ft,Kurtosis_600ft,

Kurtosis_700ft,Kurtosis_800ft,Kurtosis_900ft,Kurtosis_1000ft,Kurtosis_1100ft,

...

,Kurtosis_24000ft,Kurtosis_24100ft,Kurtosis_24200ft,Kurtosis_24300ft,

Kurtosis_24400ft,Kurtosis_24500ft,Kurtosis_24600ft,Kurtosis_24700ft,

Kurtosis_24800ft,Kurtosis_24900ft,Kurtosis_25000ft



2001,121.947914,22.75,81900,-9999,-9999,-9999,-0.24,-2.07,-9999,-9999,-9999,-9999,-9999,

-9999,-9999,-9999,-9999,-9999,

...

20.22,20.22,7.74,9.52,20.22,-9999,20.22,20.22,-9999,7.74,7.74









Compiled annual data files of cloud base values and measurement statistics for the reported cloud base levels:



The cloud base values (m) and measurement statistics for the three reported cloud base levels (columns 5, 6, and 7 for each data type) have been consolidated in 3 annual comma-separated files.



The data file naming structure follows this pattern:



CD03_Ceilometer_cloud_level_only_YYYY.csv



Where YYYY will be 2001, 2002, or 2003.



For example: CD03_Ceilometer_cloud_level_only_2001.csv



Data file header and column descriptions:

Filename:CD03_Ceilometer_Cloud_level_only_2001.csv



File creation date: 08-June-2009





Associated LBA Data Set Inventory ID: CD03_Ceilometer_Km67

Column Number Heading Units/Formats Description

1 Year YYYY Year

2 Day Decimal day of year (GMT). Note: The values are the middle of the 30-minute averaging period.

3 Hour Decimal hour of the day (GMT). Note: The values are the middle of the 30-minute averaging period - 5.25 represents the average for the 05:00-05:30 time period.

4 Seconds Number of seconds into the day (GMT).

5 BS_Cloud_1 m Cloud base for level 1 (m) - (a value of -9999 indicates no cloud base was detected)

6 BS_Cloud_2 m Cloud base for level 2 (m) - (a value of -9999 indicates no cloud base was detected)

7 BS_Cloud_3 m Cloud base for level 3 (m) - (a value of -9999 indicates no cloud base was detected)

8 SC_Cloud_1 number Sample Count for cloud base at level 1 - (a value of 0 indicates no cloud base was detected)

9 SC_Cloud_2 number Sample Count for cloud base at level 2 - (a value of 0 indicates no cloud base was detected)

10 SC_Cloud_3 number Sample Count for cloud base at level 3 - (a value of 0 indicates no cloud base was detected)

11 V_Cloud_1 Variance for cloud base at level 1 - (a value of -9999 indicates no cloud base was detected)

12 V_Cloud_2 Variance for cloud base at level 2 - (a value of -9999 indicates no cloud base was detected)

13 V_Cloud_3 Variance for cloud base at level 3 - (a value of -9999 indicates no cloud base was detected)

14 Skew_Cloud_1 Skewness for cloud base at level 1 - (a value of -9999 indicates no cloud base was detected)

15 Skew_Cloud_2 Skewness for cloud base at level 2 - (a value of -9999 indicates no cloud base was detected)

16 Skew_Cloud_3 Skewness for cloud base at level 3 - (a value of -9999 indicates no cloud base was detected)

17 Kurt_Cloud_1 Kurtosis for cloud base at level 1 - (a value of -9999 indicates no cloud base was detected)

18 Kurt_Cloud_2 Kurtosis for cloud base at level 2 - (a value of -9999 indicates no cloud base was detected)

19 Kurt_Cloud_3 Kurtosis for cloud base at level 3 - (a value of -9999 indicates no cloud base was detected)



Example Cloud Base data file records:





Header records omitted



Year,Day,Hour,Seconds,BS_Cloud_1,BS_Cloud_2,BS_Cloud_3,SC_Cloud_1,SC_Cloud_2,SC_Cloud_3,V_Cloud_1,

V_Cloud_2,V_Cloud_3,Skew_Cloud_1,Skew_Cloud_2,Skew_Cloud_3,Kurt_Cloud_1,Kurt_Cloud_2,Kurt_Cloud_3



2001,121.947914,22.75,81900,3992.88,-9999,-9999,1,0,0,-9999,-9999,-9999,-9999,-9999,-9999,-9999,-9999,-9999

2001,121.96875,23.25,83700,-9999,-9999,-9999,0,0,0,-9999,-9999,-9999,-9999,-9999,-9999,-9999,-9999,-9999

...

2001,365.947906,22.75,81900,6596.29,6652.26,-9999,81,6,0,46.09,51.68,-9999,-0.43,-1.03,-9999,-0.61,-0.65,-9999

2001,365.96875,23.25,83700,6498.46,-9999,-9999,120,0,0,29.14,-9999,-9999,-0.55,-9999,-9999,-0.1,-9999,-9999

2001,365.989594,23.75,85500,6449.04,6656.07,-9999,115,4,0,30.27,187.22,-9999,0.85,0.71,-9999,2.08,-1.72,-9999















Data Application and Derivation:

Typical Application of Data:

Ceilometers have been used to observe boundary-layer aerosols and boundary-layer mixing height. The ceilometer is also able to detect rain droplets quite well through the use of the ceilometer backscatter profile. The rain droplets are a large target for the laser compared to other aerosols; therefore a strong, distinct return signal is seen from the cloud base to the surface on the backscatter profile. By determining a return-echo threshold value for rain droplets, rain events can be detected from the ceilometer backscatter profile. The threshold value can be verified using tipping-bucket rain gauge data from the same site.



Using the ceilometer data complements the traditional rain-gauge approach as the ceilometer detects all rain events, including light ones when the rain gauge may not catch any rainfall due to wind, etc. or not enough to force a tip. Second, the ceilometer gives the instantaneous start time for precipitation, whereas with the tipping bucket rain gauge, light precipitation may have been falling for several minutes before the first tip is recorded.



Calculated Variables:

The variables calculated include the backscatter coefficient Beta(z) at profile heights from the surface to 25,000 feet at 100-foot (~30 m resolution), and is internally calculated by the software. The cloud-base heights (up to three) are also internally calculated by the software.



Processing Steps:

The raw data provided by the ceilometer were cloud-base and backscatter profile information reported every 15 seconds. From these data, an averaging program was used to calculate the statistical moments (mean, variance, skewness, and kurtosis) of the cloud-base and backscatter profile at 30-minute intervals. Each cloud base level was averaged, as well as backscatter profile level. A value of -9999 was assigned if no cloud base was reported during the interval. No further processing of the raw data from the ceilometer was done before the averaging program was run on the data.



Processing Changes and Special corrections/Adjustments:

No changes or special corrections were made to the data during processing.

Quality Assessment (Data Quality Attribute Accuracy Report):

Quality Assessment:

Errors and Limitations:

Potential sources of error may come from contamination of the ceilometer window by dirt or debris. From the users guide, in these instances it is stated that cloud height information is correct if it is detected. If cloud base heights are not detected, high clouds may be missed. Direct rain drops on the window are also a potential source of error. However, this has a minimal impact because the ceilometer was equipped with an internal blower which automatically turns on when droplets hit the window to keep the window dry in such cases.



There are no known instances of the data-processing algorithm being unreliable. For the ceilometer used at the km 67 LBA site, the ceilometer window had a special protective coating applied to it for use in tropical environments. The window coating reacted with the environmental conditions (heat, humidity), causing pitting and permanent contamination of the window over time. Data collected after June 2003 had continuous warning messages reported; such data should be used with caution. Data collected in June 2003 or earlier had no continuous warning messages reported and are considered good.



Due to remoteness of the ceilometer installation field site and difficulty in the logistics to maintain continuous power to the site, there are frequent gaps in the

data set. No gap-filling was performed to this data set. Primary reasons for data gaps are either power outages (failed generator) or a shutdown in the data-acquisition computer or data-acquisition programs running on that computer. Known prolonged data gaps are listed below. The ceilometer was installed in April 2001, with the first good data being collected on May 1, 2001 (day-of-year 121).



Data gaps in 2001:

Day-of-year 143-151 (May 23-31)

Day-of-year 161 (Jun 10)

Day-of-year 191 (Jul 10)

Day-of-year 197-199 (Jul 16-18)

Day-of-year 208-221 (Jul 27-Aug 9)

Day-of-year 224-225 (Aug 12-13)

Day-of-year 230 (Aug 18)

Day-of-year 233 (Aug 21)

Day-of-year 290-292 (Oct 17-19)





Data gaps in 2002:

Day-of-year 2-31 (Jan 2-31)

Day-of-year 84-112 (Mar 25-Apr 22)

Day-of-year 181-182 (Jun 30-Jul 1)

Day-of-year 198-203 (Jul 17-22)

Day-of-year 210-211 (Jul 29-30)

Day-of-year 331-335 (Nov 27-Dec 1)

Day-of-year 363-365 (Dec 29-31)



Data gaps in 2003:

Day-of-year 11-12 (Jan 11-12)

Day-of-year 44-90 (Feb 13-Mar 31)

Day-of-year 158-160 (Jun 7-9)

Day-of-year 168-169 (Jun 17-18)

Day-of-year 172-174 (Jun 21-23)

Day-of-year 179-181 (Jun 28-30)

Day-of-year 183-186 (Jul 2-5)

Day-of-year 197 (Jul 16)

Day-of-year 204 (Jul 23)

Day-of-year 216 (Aug 4)

Day-of-year 219-223 (Aug 7-11)

Day-of-year 239-292 (Aug 27-Oct 19)

Day-of-year 309-310 (Nov 5-6)

Day-of-year 315 (Nov 11)

Day-of-year 323-325 (Nov 19-21)

Day-of-year 357-365 (Dec 23-31)



Quality Assessment Activities:

All collected data were plotted and visually inspected by the submitter following processing for validation. Numerous repeated data lines were removed during this process. Data collected until June 2003 are considered good. Continuous warnings were reported from the ceilometer after June 2003 due to window contamination; therefore data collected after June 2003 are not considered good. Cloud-base measurement accuracy is 50 feet (~15 m).

Process Description:

Data Acquisition Materials and Methods:

A Vaisala CT-25K ceilometer was installed at the km 67 Eddy Flux Tower site between April 2001 and December 2003, with reliable data being collected between May 2001 and June 2003. The CT-25K ceilometer employs pulsed diode laser LIDAR technology (LIDAR=Light detection and ranging), where short, powerful laser pulses are sent out in a vertical or near-vertical direction. The reflection of light - backscatter - caused by haze, fog, mist, virga, precipitation and clouds is measured as the laser pulses traverse the sky. The resulting backscatter profile, i.e. signal strength versus height, is stored and processed and the cloud bases are detected. Knowing the speed of light, the time delay between the launch of the laser pulse and the detection of the backscatter signal indicates the cloud base height. The CT25K is able to detect three cloud layers simultaneously. Along with cloud base measurements the ceilometer provided 15 second measurements of a backscatter profile from the surface to 25000 ft at 100 ft resolution.

Data from the ceilometer were sent out via an RS232 serial stream and collected on a Linux computer that also collected eddy-flux data, temperature, wind, humidity and CO2 profiles as well as radiation data. The time stamps on the ceilometer data therefore correspond to these other measurements collected at this site.Ãâ�šÃâ�šÃ‚ 



Due to the large amounts of data in each backscatter profile raw 15 second data was averaged to 5 minutes to perform rain identification analysis. Please note the 30-minute averaged ceilometer data submitted to this archive were created using the same averaging programs as the 5-minute-averaged data used in the rain-event identification analysis. The threshold value for precipitation was found to be between 1.2 and 1.5 (units are log(1000*srad*km)-1) based on the review of many days of rainfall data from a tipping bucket gauge at the same site. Histograms of backscatter intensity showed the largest decrease in the number of observed backscatter densities between 1.2 and 1.3 indicating the rain threshold since most of the time it is not raining. Thus we used a rain threshold value of 1.3. Additionally the heights at which to average the backscatter profile needed to be determined. Backscatter profile data was averaged three ways; first the lower 90 m (three range gates), second the lowest level up to 75 % of the cloud base height and finally the lowest level up to 50% of the cloud base height. Averaging the backscatter profile up to 50 % of the cloud base height produced the best results.



Additional details on ceilometer measurements and calculation of cloud base and backscatter is provided in the companion file, CD03_Ceilometer_Km67_Methods.pdf.

References:

Eresmaa, N., A. Karppinen, . M. Joffre, J. Rasanen, and H. Talvitie, 2006: Mixing height determination by ceilometer. Atmos. Chem. Phys., 6, 1485-1493.



Vaisala Oyj: Ceilometer CT-25K User\'s Guide. Vantaa, Finland, 2002, 161 pp.



Zephoris, M., H. Holin, F. Lavie, N. Cenac, M. Cluzeau, O. Delas, F. Eideliman, J. Gagneux, A. Gander, and C. Thibord, 2005: Ceilometer observations of aerosol layer structure above the Petit Luberon during ESCOMPTE\'s IOP 2. Atmos. Research, 74, 581-595. doi:10.1016/j.atmosres.2004.06.014



Related Publications

Czikowsky, M. J. 2008. Observing transient characteristics of the components of the hydrological balance. Ph.D. Thesis SUNY, Albany

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