ARM Tropical Western Pacific, Nauru Site, Atmospheric Profiling
Entry ID: TWPC2atmospheric_profiling
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The Atmospheric Radiation Measurement (ARM) Program is the largest global|
change research program supported by the U.S. Department of Energy (DOE). ARM
scientists focus on obtaining field measurements and developing models to
better understand the processes that control solar and thermal infrared
radiative transfer in the atmosphere (especially in clouds) and at the earth's
The URL for the ARM Data Archive is "http://www.archive.arm.gov/". The URL for
general information about the ARM program is "http://www.arm.gov/".
The data stored by the ARM Archive includes numerous parameters about radiative
flux, meteorology, water vapor and clouds.
The Tropical Western Pacific (TWP) locale was the second field measurement site
implemented by the U.S. Department of Energy's (DOE's) Atmospheric Radiation
Measurement (ARM) Program. TWP began phased operations in 1996 at its first
facility on Manus Island. The second facility on Nauru Island was implemented
in 1998. In 2002, a third facility in Darwin, Australia was completed to
support the first two sites. The availability of data from Darwin is subject to
interruption when instruments or parts are needed to repair Manus or Nauru.
Data from these sites will be used by scientists to study the effects of this
region on the global climate.
The TWP locale is the area roughly between 10 degrees N to 10 degrees S of the
equator from Indonesia to near Christmas Island. This region of the world plays
a large role in the interannual variability observed in the global climate
system. For instance, the El Nino/Southern Oscillation phenomenon has far
reaching implications for weather patterns over much of the Northern
Hemisphere, and perhaps the entire planet. The TWP consistently has the warmest
sea surface temperatures on the planet and is referred to as the Pacific warm
pool. The warm pool supplies heat and moisture to the atmosphere above it,
resulting in the formation of deep convective cloud systems, which in turn,
produce high-altitude cirrus clouds that spread out over much of the region.
These cloud systems regulate the amount of solar energy reaching the surface of
the earth and the amount of the earth's heat energy that can escape to space.
Improved understanding of the interaction between clouds and incoming and
outgoing energy will improve the general circulation models used for climate
research. For specific information on the Nauru Site, see
Atmospheric profiling data at Nauru is collected using many specialized
instruments. Detailed information on each instrument is available at
The following list contains the instrumentation used for atmospheric profiling
and the data available for the Nauru site (C2).
Microwave Radiometer (MWR).
For complete MWR information, see
"http://www.arm.gov/instruments/". The MWR provides
time-series measurements of column-integrated amounts of water vapor and liquid
water. The instrument itself is essentially a sensitive microwave receiver.
That is, it is tuned to measure the microwave emissions of the vapor and liquid
water molecules in the atmosphere at specific frequencies. A MWR is operated at
a frequency that is optimized for a particular atmospheric condition. For
example, different frequencies may be used under low water vapor conditions
while others may improve liquid water retrievals.
At Nairu (C2) MWR data is available for 1998-10-28 to present.
ARM data streams are coded as follows:
twpmwrlosC2: water liquid and vapor along line of sight path
twpmwrtipC2: airmasses, brightness temperatures in TIP mode
twp5mwravgC2: 5-minute average integrated vapor and liquid water
twpqmemwrcolC2: Derived: QME comparing column water from MWR vs.
Additional data streams or value added products may be added in the future.
Balloon-Borne Sounding System (BBSS).
For complete BBSS information, see
"http://www.arm.gov/instruments/". The BBSS provides
in-situ measurements (vertical profiles) of both the thermodynamic state of the
atmosphere, and the wind speed and direction. Pressure (hPa), temperature
(degC), relative humidity (percent RH), wind speed (m/s), and wind direction
(deg) are measured as functions of time during a free-balloon ascent. Secondary
(derived) quantities included in the data stream, also measured as functions of
time, are altitude (gpm), dew point (degC), ascent rate (m/s), latitude of
sonde (degN), longitude of sonde (degW), u-component of wind velocity (m/s),
and v-component of wind velocity (m/s).
At Nairu (C2), BBSS data are available for 1998-11-53 to present.
ARM data stream is coded as follows:
twpsondewnpnc2: Vaisala-processed winds, pressure, temperature and relative
Additional data streams or value added products may be added in the future.
GET RELATED SERVICE METADATA (SERF)
Description: NCVweb is an interactive web-based tool for viewing atmospheric radiation
measurement (ARM) data.
Link: VIEW RELATED INFORMATION
Description: This catalog lists the data streams that are currently available from the ARM
Archive. The data streams are listed by file format type (i.e, CDF, HDF, RAW,
JPG, ASC, and Other) and then by the site where the data are collected. Each
list contains the name of the data streams in alphanumeric order, the number of
files within the data stream, the minimum data date, and the maximum data date.
The sites that have the word development in parenthesis are data processes
which are operated during the final phases of implementation of a data source,
resulting in data which are labeled as Development. Development data are
frequently available to users, but additional information about the operating
conditions and potential for errors must be considered. The files in CDF format
are also listed in preformatted lists for those browsers that have difficulty
handling large html tables. The information in this catalog is updated about
once a month.
|N: -0.521||S: -0.521||E: 166.916||W: 166.916||
Data Set Citation
Wanda Ferrell, Ted Cress, Thomas Ackerman
Dataset Title: ARM Tropical Western Pacific, Nauru Site, Atmospheric Profiling
Data Presentation Form: netCDF files
Online Resource: http://www.arm.gov
|Start Date: 1998-10-28|
> PACIFIC OCEAN
> WESTERN PACIFIC OCEAN
> NAURU ISLAND, ARM TWP SITE C2
|ATMOSPHERE >ATMOSPHERIC PRESSURE >ATMOSPHERIC PRESSURE MEASUREMENTS [Definition]|
|ATMOSPHERE >ATMOSPHERIC TEMPERATURE >AIR TEMPERATURE [Definition]|
|ATMOSPHERE >ATMOSPHERIC WATER VAPOR >DEW POINT TEMPERATURE [Definition]|
|ATMOSPHERE >ATMOSPHERIC WATER VAPOR >HUMIDITY [Definition]|
|ATMOSPHERE >ATMOSPHERIC WATER VAPOR >WATER VAPOR [Definition]|
|ATMOSPHERE >CLOUDS >CLOUD MICROPHYSICS >CLOUD LIQUID WATER/ICE [Definition]|
|ATMOSPHERE >ATMOSPHERIC WINDS >WIND PROFILES [Definition]|
ISO Topic Category
|LIDAR >Light Detection and Ranging [Information]|
|MWR >Microwave Water Radiometer [Information]|
|ARM >Atmospheric Radiation Measurement Project [Information]|
One of the goals of the ARM Program is to provide data streams of reasonable|
quality for scientific research. Traditionally, data quality issues have been
addressed within ARM at several levels, including by instrument mentors, site
scientists, value added product scientists, and Science Team members at large.
Maintaining data quality for a program of the size and complexity of ARM is a
significant challenge. Efforts toward this end have matured and evolved over
the life of the program. The ARM Program Data Quality (DQ) Office has the
responsibility for ensuring that quality assurance results are communicated to
(1) data users so that they may make informed decisions when using the data,
and (2) ARM's Site Operations and Engineers to facilitate improved instrument
performance and thereby minimize the amount of unacceptable data collected. For
Data of common interest from external sources are shared whenever possible, but|
some sources restrict secondary distribution of data. In these cases, ARM will
seek specific allowances to distribute such data to members of the ARM Science
Team, but will observe restrictions on further distribution from the Archive if
Use-constraints, if any, are provided in Data Quality Reports sent with the|
data files when data are requested. The automatic inclusion of a data
originator as a co-author is not insisted upon in the ARM program, but the
source of any data should be clearly recognized either as a co-author or
through an appropriate acknowledgment. The ARM Program should be acknowledged
in publications as the programmatic origin of the field program. ARM-funded
investigators will use the following acknowledgment: "This research was
supported by the Office of Biological and Environmental Research of the U.S.
Department of Energy (under grant or contract number - if appropriate) as part
of the Atmospheric Radiation Measurement Program." The U.S. Department of
Energy's Atmospheric Radiation Measurement Program should be appropriately
acknowledged in publications resulting from collaborative efforts in which ARM
data or facilities were used. ARM-funded principal investigators will give
proper acknowledgment to cooperating or collaborating programs in those cases
where data originating therein are being used.
|Department of Energy|
ARM Archive, Atmospheric Radiation Measurement Program, U. S. Department of Energy
Data Center URL: http://www.archive.arm.gov
FTP or request
Role: TECHNICAL CONTACT
Phone: (505) 667-1186
Fax: (505) 667-9122
Email: ljones at lanl.gov
Tropical Western Pacific Project Office
Los Alamos National Laboratory
P.O. Box 1663, MSJ577, TA-51, Bldg. 82
City: Los Alamos
Province or State: NM
Postal Code: 87545
Phone: (509) 372-4917
Fax: (509) 372-6247
Email: Chuck.Long at pnl.gov
Battelle/Pacific Northwest National Laboratory
P.O. Box 999, MSIN K9-38
Province or State: WA
Postal Code: 99352
Role: DIF AUTHOR
Email: mccordra at ornl.gov
Building 1507, MS 6407
P.O. Box 2008
Oak Ridge National Laboratory
City: Oak Ridge
Province or State: TN
Postal Code: 37831-6407
Program. Physics Today 56: 38-44. Science Plan for the Atmospheric Radiation
Measurement Program (ARM). 1996. U.S. Department of Energy, DOE/ER-0670T.
Atmospheric Radiation Measurement Program Plan. 1990. DOE/ER-0441. U.S.
Department of Energy, Office of Energy Research, Washington, D.C. NTIS
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