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RISShort-Range and Medium-Range Weather Forecasting in the Extratropics during Wintertime with and without an Interactive Ocean
Publisher: American Meteorological Society
Abstract: The ECMWF monthly forecasting system is used to investigate the impact that an interactive ocean has on short-range and medium-range weather predictions in the Northern Hemisphere extratropics during wintertime. On a ...
The Link between the North Atlantic Oscillation and Arctic Sea Ice Export through Fram Strait
Publisher: American Meteorological Society
Abstract: Recently, Hilmer and Jung have shown that the wintertime link between the North Atlantic oscillation (NAO) and the sea ice export through Fram Strait changed from zero correlation (1958?77) to about 0.7 (1978?97) during ...
Sensitivity of the Tropospheric Circulation to Changes in the Strength of the Stratospheric Polar Vortex
Publisher: American Meteorological Society
Abstract: The sensitivity of the wintertime tropospheric circulation to changes in the strength of the Northern Hemisphere stratospheric polar vortex is studied using one of the latest versions of the ECMWF model. Three sets of ...
North Atlantic Interdecadal Variability: Oceanic Response to the North Atlantic Oscillation (1865–1997)
Publisher: American Meteorological Society
Abstract: In contrast to the atmosphere, knowledge about interdecadal variability of the North Atlantic circulation is relatively restricted. It is the objective of this study to contribute to understanding how the North Atlantic ...
Local versus Tropical Diabatic Heating and the Winter North Atlantic Oscillation
Publisher: American Meteorological Society
Abstract: In this paper, a version of the European Centre for Medium-Range Weather Forecasts (ECMWF) operational model is used to (i) diagnose the diabatic heating associated with the winter North Atlantic Oscillation (NAO) and (ii) ...
Greenland’s Pressure Drag and the Atlantic Storm Track
Publisher: American Meteorological Society
Abstract: Some effects of Greenland on the Northern Hemisphere wintertime circulation are discussed. Inviscid pressure drag on Greenland?s slopes, calculated from reanalysis data, is related to circulation patterns. Greenland lies ...
Climatology and Interannual Variability in the Intensity of Synoptic-Scale Processes in the North Atlantic from the NCEP–NCAR Reanalysis Data
Publisher: American Meteorological Society
Abstract: North Atlantic synoptic-scale processes are analyzed by bandpassing 6-hourly NCEP?NCAR reanalysis data (1958?98) for several synoptic ranges corresponding to ultrahigh-frequency variability (0.5?2 days), synoptic-scale ...
Estimation of the Impact of Sampling Errors in the VOS Observations on Air–Sea Fluxes. Part II: Impact on Trends and Interannual Variability
Publisher: American Meteorological Society
Abstract: Using the same approach as in Part I, here it is shown how sampling problems in voluntary observing ship (VOS) data affect conclusions about interannual variations and secular changes of surface heat fluxes. The largest ...
Response to the Summer of 2003 Mediterranean SST Anomalies over Europe and Africa
Publisher: American Meteorological Society
Abstract: The sensitivity of the atmospheric circulation to the warm Mediterranean sea surface temperature (SST) anomalies observed during the summer of 2003 (July and August) is studied using the European Centre for Medium-Range ...
Estimation of the Impact of Sampling Errors in the VOS Observations on Air–Sea Fluxes. Part I: Uncertainties in Climate Means
Publisher: American Meteorological Society
Abstract: Sampling uncertainties in the voluntary observing ship (VOS)-based global ocean?atmosphere flux fields were estimated using the NCEP?NCAR reanalysis and ECMWF 40-yr Re-Analysis (ERA-40) as well as seasonal forecasts without ...