9.7.1 Overview
of Data Products
For
radiosonde systems, the final data products typically consist of one or more
ASCII files that contain the reduced thermodynamic data (pressure,
temperature, relative humidity, dewpoint,
etc.) and wind speed and wind direction as a function of altitude. Some
radiosonde data systems store the
thermodynamic information in one data file and the wind information in another, whereas other systems combine the
observations into a single data file. Regardless of the
approach used, the files containing the reduced wind and thermodynamic
observations should be considered the
final data products produced by the radiosonde sounding systems. Depending on the type of equipment, additional files may
be created that include data reported in formats specifically
intended for use by the NWS or other organizations, information on site
location, sampling parameters, balloon
position, etc. Typically, one set of files is created per sounding, that
is, data from multiple soundings are not merged together.
For
the remote sensing systems (sodar, radar wind profilers, RASS), the final
data products usually consist of one or more ASCII files containing the
averaged profiles of winds or virtual
temperatures as a function of altitude. Supporting information provided with
the reduced data products may include
other variables such as horizontal and vertical meteorological velocity components (u, v, w), averaged return power, SNR
or some other measure of signal strength, estimates
of turbulence parameters (
,
), mixing depth, etc. Typically one set of files is produced per
24-hour sampling period. These data files should be considered the final
data products produced by this class of
upper-air monitoring system. Other (lower-level) information generated
by these systems may include, for example, the Doppler moment data and raw
Doppler spectra. The quantity of
information produced by the remote sensing systems usually requires that
the lower-level data be stored in a binary format to conserve disk space.
These data should be archived for backup
purposes and to support post-processing or additional analyses of periods of
interest.
9. UPPER-AIR MONITORING
9.1 Fundamentals
9.1.1 Upper-Air Meteorological Variables
9.1.2 Radiosonde Sounding System
9.1.3 Doppler Sodar
9.1.4 Radar Wind Profiler
9.1.5 RASS
9.2 Performance Characteristics
9.2.1 Definition of Performance Specifications
9.2.2 Performance Characteristics of Radiosonde Sounding Systems
9.2.3 Performance Characteristics of Remote Sensing Systems
9.3 Monitoring Objectives and Goals
9.3.1 Data Quality Objectives
9.4 Siting and Exposure
9.5 Installation and Acceptance Testing
9.6 Quality Assurance and Quality Control
9.6.1 Calibration Methods
9.6.2 System and Performance Audits
9.6.3 Standard Operating Procedures
9.6.4 Operational Checks and Preventive Maintenance
9.6.5 Corrective Action and Reporting
9.6.6 Common Problems Encountered in Upper-Air Data Collection
9.7 Data Processing and Management (DP&M)
9.7.1 Overview of Data Products
9.7.2 Steps in DP&M
9.7.3 Data Archiving
9.8 Recommendations for Upper-Air Data Collection