Quasi-Biennial Oscillation (QBO) Zonal Wind Index, 1953-present
Entry ID: QBO_ZONAL_WIND_INDEX

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Summary
Abstract: [Text Source: Freie Universitat Berlin, http://www.geo.fu-berlin.de/en/met/ag/strat/produkte/qbo/ ]

Almost 50 years ago, the Quasi-Biennial Oscillation (QBO) of the winds in the equatorial stratosphere was detected due to the establishment of a global, regularly measuring radiosonde network (Graystone, 1959; Ebdon, 1960).

As part of the compilation of our daily stratospheric charts we have tabulated the daily wind observations of selected stations near the equator since 1957. For the earlier years, the values were extracted from the Northern Hemisphere Data Tabulations. From these daily values the monthly mean zonal wind components were calculated for the levels 70, 50, 40, 30, 20, 15, and 10 hPa and a data set from 1953 to the present was produced by combining the observations of the three radiosonde stations Canton Island (closed 1967), Gan/Maledive Islands (closed 1975), and Singapore (data file: qbo.dat).

This data set is supposed to be representative of the equatorial belt since all studies have shown that longitudinal differences in the phase of the QBO are small. It should be noted, however, that some uncertainties arose at higher levels during the early years from the scarcity of observations. More information on the original data can be found in Naujokat (1986).

A second data set has been produced since 1987 from the Singapore data by using the daily vertical wind profiles to obtain a higher vertical resolution. In this set you will find the monthly mean zonal wind components at Singapore for every year from 1987 to the present at the levels 100 (since 1997), 90, 80, 70, 60, 50, 45, 40, 35, 30, 25, 20, 15, 12, and 10-hPa (singapore.dat).

Related URL
Link: GET DATA
Description: Access to documentation, graphics, and QBO monthly data.


Link: VIEW PROJECT HOME PAGE
Description: Stratospheric Research Group of the Freie Universitat Berlin, Germany.


Geographic Coverage
 N: 1.0 S: -3.0  E: -172.0  W: 73.0

Data Set Citation
Dataset Originator/Creator: Barbara Naujokat, Christian Marquardt, Freie Universitat Berlin.
Dataset Title: Quasi-Biennial Oscillation (QBO) Zonal Wind Index
Dataset Release Place: Berlin, Germany
Dataset Publisher: Freie Universitat Berlin
Online Resource: http://www.geo.fu-berlin.de/en/met/ag/strat/produkte/qbo/


Temporal Coverage
Start Date: 1953-01-01


Location Keywords
OCEAN > PACIFIC OCEAN > TROPICAL PACIFIC
VERTICAL LOCATION > STRATOSPHERE
GEOGRAPHIC REGION > TROPICS


Data Resolution
Temporal Resolution: Biennial


Science Keywords
ATMOSPHERE >ATMOSPHERIC WINDS >UPPER LEVEL WINDS    [Definition]
CLIMATE INDICATORS >ATMOSPHERIC/OCEAN INDICATORS >TELECONNECTIONS >QUASI-BIENNIAL OSCILLATION >QBO    [Definition]


ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE


Use Constraints
Please cite the dataset originator if you use this data.


Keywords
QBO
Quasi-Biennial Oscillation
zonal winds
wind anomalies
climate index
climate indices
climate change


Data Set Progress
IN WORK


Data Center
Meteorological Institute, Freie Universitat Berlin    [Information]
Data Center URL: http://www.met.fu-berlin.de/

Data Center Personnel
Name: CHRISTIAN MARQUARDT
Email: marq at gfz-potsdam.de
Contact Address:
GeoForschungs Zentrum
City: Potsdam
Country: Germany



Distribution
Distribution_Media: Online (HTTP)
Distribution_Format: ASCII
Fees: None


Personnel
CHRISTIAN MARQUARDT
Role: TECHNICAL CONTACT
Role: INVESTIGATOR
Email: marq at gfz-potsdam.de
Contact Address:
GeoForschungs Zentrum
City: Potsdam
Country: Germany


BARBARA NAUJOKAT
Role: INVESTIGATOR
Role: TECHNICAL CONTACT
Email: naujokat at strat01.met.fu-berlin.de
Contact Address:
Institut fur Meteorolgie
der Freien Universitat Berlin
Carl-Heinrich-Becker-Weg 6-10
Postal Code: 12165
Country: GERMANY


Publications/References
Naujokat, B. (1986), An update of the observed quasi-biennial oscillation of the stratospheric winds over the tropics, J. Atmos. Sci., 43, 1873-1877

Marquardt, C., and B. Naujokat (1997), An update of the equatorial QBO and its variability. 1st SPARC Gen. Assemb., WMO/TD, 1, 814, 87-90, Melbourne Australia

Marquardt, C. (1997), Die tropische QBO und dynamische prozesse in der stratosphdre., Ph.D. dissertation, Freie Universitdt Berlin

Creation and Review Dates
DIF Creation Date: 1999-07-30
Last DIF Revision Date: 2012-09-24

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