Identification

Title

The Relative Accuracy of ALPEX Aircraft Data / an Evaluation of the ALPEX Intercomparison Flight With the NCAR Electra, the NOAA P3, and the DFVLR Falcon

Abstract

During the ALPEX progran, three participating large research aircraft - the NCAR Electra, the NOAA P5, and the DFVLR Falcon - joined for an interccmparison flight. Using the data frcm this flight, this report lists the relative accuracies for position, pressure, temperature, humidity, horizontal and vertical winds, radio altitude, and radiation (some of these quantities were measured by two aircraft only). The results are presented in form of basic statistical data such as mean differences, standard deviations, and correlation coefficients, as well as in form of power, coherence and - for some quantities - phase spectra. Notable results are: - Generally, the differences observed are within the accuracies specified for the three aircraft. - The standard deviation of differences in temperature never exceed 0.1 ï¿½ï¿½C, the differences themselves are of the order of 0.5 ï¿½ï¿½C. - Humidity data for the Electra exhibits intervals with strong oscillations; the time averaged data shows good agreenent with the measurements frcm the P3 and the Falcon. - The wind measurements of the P3 differ significantly from correlated measurements of the Electra and the Falcon. the well - Longwave radiation data downward for the Falcon appears to be too high. In cases where significant differences were found, an attenpt has been made to determine the basic measurement which is most likely responsible for the suspicious data. The report also discusses the effect of spectral properties of data and lists a procedure lyman-alpha raw data to dewpoint tenperature. NOTE: Based on the algorithm for the other changes were results presented the three aircraft consulted! data resolution on the for converting Electra results of this intercanparison, the wind ccmputation P3 has been modified. As this report went into press, pending. Therefore, before applying any of the in this report to data which was produced by any of after mid 1984, the operating facility should be

Resource type

document

Resource locator

Unique resource identifier

code

http://n2t.net/ark:/85065/d7668cmq

codeSpace

Dataset language

eng

Spatial reference system

code identifying the spatial reference system

Classification of spatial data and services

Topic category

geoscientificInformation

Keywords

Keyword set

keyword value

Text

originating controlled vocabulary

title

Resource Type

reference date

date type

publication

effective date

2016-01-01T00:00:00Z

Keyword set

keyword value

EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC TEMPERATURE > UPPER AIR TEMPERATURE

EARTH SCIENCE > SPECTRAL/ENGINEERING > PLATFORM CHARACTERISTICS

EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC WINDS > WIND DYNAMICS > VERTICAL WIND VELOCITY/SPEED

EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC WINDS > UPPER LEVEL WINDS > FLIGHT LEVEL WINDS

EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC TEMPERATURE > UPPER AIR TEMPERATURE > DEW POINT TEMPERATURE

EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC PRESSURE > STATIC PRESSURE

EARTH SCIENCE > SPECTRAL/ENGINEERING > SENSOR CHARACTERISTICS

originating controlled vocabulary

title

U.S. National Aeronautics and Space Administration Global Change Master Directory

reference date

date type

revision

effective date

2021-09-17

Geographic location

West bounding longitude

East bounding longitude

North bounding latitude

South bounding latitude

Temporal reference

Temporal extent

Begin position

End position

Dataset reference date

date type

publication

effective date

1985-01-01T00:00:00Z

Frequency of update

Quality and validity

Lineage

Conformity

Data format

name of format

version of format

Constraints related to access and use

Constraint set

Use constraints

Limitations on public access

None

Responsible organisations

Responsible party

contact position

OpenSky Support

organisation name

UCAR/NCAR - Library

full postal address

PO Box 3000

Boulder

80307-3000

email address

opensky@ucar.edu

web address

http://opensky.ucar.edu/

name: homepage

responsible party role

pointOfContact

Metadata on metadata

Metadata point of contact

contact position

OpenSky Support

organisation name

UCAR/NCAR - Library

full postal address

PO Box 3000

Boulder

80307-3000

email address

opensky@ucar.edu

web address

http://opensky.ucar.edu/

name: homepage

responsible party role

pointOfContact

Metadata date

2023-08-18T18:05:59.239916

Metadata language

eng; USA