Long Term Variability of Sea Level and Atmospheric Pressure in the Mediterranean Region 157
of India and the Sahel, defined by July-September rainfall, with different
characteristics for the western and eastern Mediterranean basins. In the eastern
basin AP is anticorrelated with both precipitation regimes in July-September, while
in the western basin it is highest positively correlated in September-November, that
is later than the main rainfall period. SL is highest anticorrelated with both
precipitation regimes in September-November all over the basin. This means that,
while in the western basin the teleconnection can be considered indirect, being
mediated by the IB, in the eastern basin SL may exhibit a delayed response to the
summer circulation via baroclinic processes, such as heat storage.
Teleconnections with India and Sahel precipitation regimes are also found with
the Mediterranean Pressure Index (MPI, Raicich et ai., 200 I), that is an East-West
pressure difference related to the geostrophic component of the Etesian wind regime,
typically affecting the Mediterranean in summer.
References
Hurrell 1W (1995) Decadal trends in the North Atlantic Oscillation: Regional temperatures and
precipitations. Science, 269:676-679.
1ackson M (1986) Operational Supertiles in Met. O. 13. Met. O. 13 Technical Note 25.
Ng CN, Young PC(l990) Recursive estimation and forecasting of non-stationary timeseries. 1.
Forecasting, 9: 173-204.
Raicich F, Pinardi N, Stevanato A, Navarra A (200 I) Teleconnections between Indian Monsoon and
Sahel rainfall and the Mediterranean. International 10urnal of Climatology, submitted.
Spencer NE, Woodworth PL (1993) Data holdings of the Permanent Service for Mean Sea Level
(November 1993). Bidston, Birkenhead, Permanent Service for Mean Sea Level, 81 pp.
Ward MN (1996) Local and remote climate variability associated with East Mediterranean sea
surface temperature anomalies. Proceeding, Conf on Mediterranean Forecasting, La Londe Les
Maures, France, European Science Foundation, pp. 16-25.
Ward MN (1998) Diagnosis and short-lead time prediction of summer rainfall in Tropical North
Africa at interannual and multidccadal timescales. 1. Climate, II. 3167-3191.
of India and the Sahel, defined by July-September rainfall, with different
characteristics for the western and eastern Mediterranean basins. In the eastern
basin AP is anticorrelated with both precipitation regimes in July-September, while
in the western basin it is highest positively correlated in September-November, that
is later than the main rainfall period. SL is highest anticorrelated with both
precipitation regimes in September-November all over the basin. This means that,
while in the western basin the teleconnection can be considered indirect, being
mediated by the IB, in the eastern basin SL may exhibit a delayed response to the
summer circulation via baroclinic processes, such as heat storage.
Teleconnections with India and Sahel precipitation regimes are also found with
the Mediterranean Pressure Index (MPI, Raicich et ai., 200 I), that is an East-West
pressure difference related to the geostrophic component of the Etesian wind regime,
typically affecting the Mediterranean in summer.
References
Hurrell 1W (1995) Decadal trends in the North Atlantic Oscillation: Regional temperatures and
precipitations. Science, 269:676-679.
1ackson M (1986) Operational Supertiles in Met. O. 13. Met. O. 13 Technical Note 25.
Ng CN, Young PC(l990) Recursive estimation and forecasting of non-stationary timeseries. 1.
Forecasting, 9: 173-204.
Raicich F, Pinardi N, Stevanato A, Navarra A (200 I) Teleconnections between Indian Monsoon and
Sahel rainfall and the Mediterranean. International 10urnal of Climatology, submitted.
Spencer NE, Woodworth PL (1993) Data holdings of the Permanent Service for Mean Sea Level
(November 1993). Bidston, Birkenhead, Permanent Service for Mean Sea Level, 81 pp.
Ward MN (1996) Local and remote climate variability associated with East Mediterranean sea
surface temperature anomalies. Proceeding, Conf on Mediterranean Forecasting, La Londe Les
Maures, France, European Science Foundation, pp. 16-25.
Ward MN (1998) Diagnosis and short-lead time prediction of summer rainfall in Tropical North
Africa at interannual and multidccadal timescales. 1. Climate, II. 3167-3191.