Global Change Master Directory (GCMD)

Data Sets

Services / Tools

Ancillary Descriptions

Are you using a browser that doesn't support JavaScript or have you disabled JavaScript?

If you have disabled JavaScript, you must re-enable JavaScript to use this page.
Or you can view this record using the Text Only Format.

North Atlantic Oscillation Reconstruction
Entry ID: NOAA_NCDC_PALEO_2006-055

[ Get Data ]
[ Update this Record ]

Summary

Abstract: A method is presented to reconstruct decadal variations of the North Atlantic
Oscillation (NAO). The spectral characteristics of the NAO on time scales of
decades and longer are of particular interest for the understanding of North
Atlantic ocean's atmosphere interactions. The reconstruction is based on a
transfer model calibration that uses bandpass-filtered time series. The maximum
overlap discrete wavelet transform (MODWT) is applied for decomposing the time
series variance into different time scales. A total of 43 proxies, including
Greenland ice cores and European tree-ring chronologies, are selected and
regionally grouped providing four independent reconstructions for the period
1700-1978. The mean reconstruction agrees well with two recently published
reconstructions during most of the time period. However, there are considerable
differences in the earliest part before 1750. Running correlations between the
reconstructions indicate that time-dependent relations exist among the different
NAO reconstructions. The results suggest that the geographical distribution of
proxies strongly affects the reconstruction and could explain some of the apparent
discrepancies among the reconstructions recently published in literature. In the
early eighteenth century, external forcing (solar, volcanic) seems to mask the
NAO signature within the proxies.

Related URL

Link: GET DATA
Link: GET DATA
Description: Access to data and documentation

Geographic Coverage

N: 75.0 S: 0.0 E: 10.0 W: -70.0

Data Set Citation

Dataset Originator/Creator: Timm, O., E. Ruprecht, and S. Kleppek
Dataset Title: North Atlantic Oscillation Reconstruction
Dataset Series Name: IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2006-055
Dataset Release Date: May 2006
Dataset Release Place: Buolder, CO
Dataset Publisher: IGBP PAGES/World Data Center for Paleoclimatology
Issue Identification: 2006-055
Other Citation Details: NOAA/NCDC Paleoclimatology Program
Online Resource: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/paleocean/by_contributor/tim...

Temporal Coverage

Start Date: 1700-01-01

Stop Date: 1978-12-31

Location Keywords

OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN

Science Keywords

PALEOCLIMATE >ICE CORE RECORDS    [Definition]

PALEOCLIMATE >LAND RECORDS >TREE RINGS    [Definition]

CLIMATE INDICATORS >ATMOSPHERIC/OCEAN INDICATORS >TELECONNECTIONS >NORTH ATLANTIC OSCILLATION    [Definition]

PALEOCLIMATE >PALEOCLIMATE RECONSTRUCTIONS    [Definition]

ISO Topic Category

GEOSCIENTIFIC INFORMATION

Project

PAGES >Past Global Changes, IGBP [Information]

Use Constraints

FUNDING SOURCE: German Research Foundation, as a contribution to the
Sonderforschungsbereich 460 "Dynamics of Thermohaline Circulation Variability"
at the University Kiel.

Keywords

NAO

decadal-scale variability

tree-ring chronologies

Data Set Progress

COMPLETE

Originating Center

NOAA/NCDC

Data Center

World Data Center for Paleoclimatology, Boulder [Information]
Data Center URL: http://www.ncdc.noaa.gov/paleo/

Data Center Personnel

Name: WDC/PALEOCLIMATOLOGY, BOULDER
Phone: +1 (303) 497-6160
Fax: +1 (303) 497-6513
Email: paleo at noaa.gov
Contact Address:
World Data Center for Paleoclimatology
NOAA/NCDC Code E/GCx3
325 Broadway
City: Boulder
Province or State: CO
Postal Code: 80303
Country: USA

Distribution

Distribution_Media: ftp
Distribution_Format: text, excel
Fees: none

Personnel

OLIVER TIMM
Role: INVESTIGATOR

EBERHARD RUPRECHT
Role: INVESTIGATOR

SABINE KLEPPEK
Role: INVESTIGATOR

Publications/References

Timm, O., E. Ruprecht, and S. Kleppek. 2004. Scale-Dependent Reconstruction of the NAO Index. Journal of Climate, Vol. 17, pp. 2157-2169.

Timm, O., 2003(December): Decadal to Interdecadal Variability of the North Atlantic Oscillation: A Paleoclimatic Index Reconstruction, Institut fuer Meereskunde an der Universitaet zu Kiel, Germany.
http://e-diss.uni-kiel.de/diss_932/d932.pdf#search='oliver%20timm%2...

Creation and Review Dates

DIF Creation Date: 2007-07-27

Last DIF Revision Date: 2007-08-07

[ Update this Record ]