"The North Atlantic Oscillation"
Yochanan Kushnir and Martin Visbeck
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Deadline for submission extended to February 15 2001
Entries are in no particular order
- Luterbacher, J., Xoplaki, E., Schmutz, C., Jones, P.D., Davies, T.D.,
Gyalistras, D. and Wanner, H., 2001: Extending Highly Resolved NAO
Reconstructions Back to AD 1500. Jim Hurrell, Yochanan Kushnir and Martin
Visbeck (eds.) "The North Atlantic Oscillation", AGU Mongraph, American
Woolf, D., P. Challenor and D. Cotton: Sensitivity of Significant Wave Height
in the Wintertime to the NAO
El Hamly: Is NAO a nonstationary time series?
- The Matching Pursuit Transform does a better job in identifying
the singularity in time series (e.g., Mobile NAO (NAOm) signal).
- In the time-frequency plane plot each wavelet coefficient occupies
a box having a constant area ("Heisenberg uncertainty boxes").
There is significant "activity" at both fine and coarse scales.
- The "jumps" in the NAOm signal appear as fine-scale features
(tall thin vertical boxes). The fine-scale features are well
localized in time, but poorly localized in frequency. The most
significant "jumps" occurred in 1961, late 1962, late 1972,
and 1986. Wider "jumps" for periods greater than 1.3 years occurred
in 1978-79, 1983-84, and 1998-99. Also, note the much wider "jumps"
occurring in 1990-92 for periods greater than 3 years.
- The "smooth" part of the NAOm signal appears as a coarse-scale
feature (relatively flat wide boxes) which are poorly localized
in time. However, coarse-scale features are generally well localized
in frequency. Examples: late 1984-89 for periods greater than 5 years,
and 1995-2000 centered at 3.5 years.
- The changing nature of the NAOm signal is reflected in the time-frequency
plot. Coarser-scale features in the lower frequency range have been more
dominant in recent years and finer-scale features have been more dominant
in the 1960s-1970s.
B. Topliss: Fisch in the air, evidence of ocean feedback?
Authors: C. Rodríguez-Puebla*; J. Sáenz**; A.H. Encinas*** and J. Zubillaga****
* Dept. of Atmospheric Physics, University of Salamanca. Spain
** Dept of Applied Physics. University of Basque Country. Spain
*** Dept. of Applied Mathematics. University of Salamanca. Spain
**** Dept. of Condensed Matter. University of Basque Country. Spain.
Relationships between winter air temperature over south-western Europe and
Author: David B. Enfield
A) An index of the 60-70 year Atlantic Multidecadal Oscillation (AMO) is
shown with its principal warm and cool phases during the 20th century. For
each phase a 30 year period is identified that is used to correlate tropical
Pacific SST variability with U.S. Rainfall. B) Correlation of the boreal
winter NINO 3.4 SST index with averaged U.S. Rainfall for
January-February-March, in the positive phase period (1930-59). C) As in
(B), but for the negative phase period (1965-1994).
Author: M. D. Frías and C. Rodríguez-Puebla. Dept. of Atmospheric Physics,
University of Salamanca (Spain)
Study of Frequency Variability of Winter Precipitation over the
South-Western Europe and its Relationships with Teleconnection Indices
Author: R. Curry and M. McCartney (WHOI)
Weakening and strengthening of the North Atlantic Gyre Circulation associated
with the NAO
Author: Jung and Hilmer (IfM-Kiel)
Shift of the Centers of Interannual NAO Variability
Author: K. Drinkwater (BIO)
The Impact of the NAO on the Growth of Atlantic Cod off Labrador and
The grow of northern cod, as defined by the weight gain between ages 2 and
5, is inversely related to the NAO index. The index is the average over the
3 years the cod is growing. A high index, which produces cold ocean
temperatures, strong winds and lots of ice off Labrador and Newfoundland,
results in low growth. The pictures of the cod show the relative size of
5-year old fish under maximum and minimum NAO conditions.
Author: D.P. Stephenson (BIO)
NAO and the sexlife of Scandinavian ungulates
Figures outside of the competition