Journal ArticleDOI
Classification, seasonality and persistence of low-frequency atmospheric circulation patterns
TLDR
In this article, Orthogonally rotated principle component analysis (RPCA) was used to identify and describe the seasonality and persistence of the major modes of interannual variability.Abstract:
Orthogonally rotated principle component analysis (RPCA) of Northern Hemisphere 1-month mean 700 mb heights is used to identify and describe the seasonality and persistence of the major modes of interannual variability. The analysis is detailed and comprehensive, in that 1) a high resolution, approximately equal-area 358-point grid is used for the virtually maximum possible 35-year period of record, 2) a positive bias in the NMC data base in the early 1950s in the subtropics is largely eliminated for the first time, and 3) homogeneous, separate analyses of each month of the year are carried out, detailing the mouth-to-month changes in the dominant circulation patterns. Winter results are similar to those of other recent RPCA and teleconnection studies except that some less obvious patterns are identified and further detail of the better-known patterns is provided. Two north-south dipole patterns are found over the Pacific Ocean (West Pacific Oscillation and East Pacific pattern) and over the Atla...read more
Citations
More filters
Journal ArticleDOI
Investigation of the 2006 drought and 2007 flood extremes at the Southern Great Plains through an integrative analysis of observations
Xiquan Dong,Baike Xi,Aaron Kennedy,Zhe Feng,Jared Entin,Paul R. Houser,Robert A. Schiffer,Tristan L'Ecuyer,William S. Olson,Kuolin Hsu,W. Timothy Liu,Bing Lin,Yi Deng,Tianyu Jiang +13 more
TL;DR: In this article, the authors examined hydrological extremes in the central US in consecutive years at the Southern Great Plains (SGP) in recorded history and found that large-scale dynamics play a key role in these extreme events.
Journal ArticleDOI
Surface freshwater flux variability and recent freshening of the North Atlantic in the eastern subpolar gyre
Simon A. Josey,Robert Marsh +1 more
TL;DR: In this paper, the authors investigated the relationship between the air-sea flux of freshwater and its connection to the observed freshening of the eastern half of the North Atlantic subpolar gyre over the period 1960 to present using atmospheric model reanalyses and observational data.
Journal ArticleDOI
Spatial Patterns of Sea Level Variability Associated with Natural Internal Climate Modes
Weiqing Han,Gerald A. Meehl,Detlef Stammer,Aixue Hu,Benjamin D. Hamlington,Jessica Kenigson,Hindumathi Palanisamy,Philip R. Thompson +7 more
TL;DR: The current state of knowledge about spatial patterns of sea level variability associated with natural climate modes on interannual-to-multidecadal timescales is reviewed, with particular focus on decadal- to-multidescadal variability.
Journal ArticleDOI
Interannual Variability of Patterns of Atmospheric Mass Distribution
TL;DR: In this paper, a 40-yr European Centre for Medium-Range Weather Forecasts (ECMWF) Re-Analysis (ERA40) for 1958 to 2001, adjusted for bias over the southern oceans prior to 1979, an analysis is made of global patterns of monthly mean anomalies of atmospheric mass, which is approximately conserved globally.
Journal ArticleDOI
Relation Between the North-Atlantic Oscillation and Hydroclimatic Conditions in Mediterranean Areas
Luigia Brandimarte,Giuliano Di Baldassarre,Guendalina Bruni,Paolo D'Odorico,Alberto Montanari +4 more
Abstract: Mediterranean basins are known for their susceptibility to water stress conditions resulting from a reduction in winter-season precipitation. This region is also prone to the effects of the North Atlantic Oscillation (NAO), a large-scale climatic pattern associated with a displacement of air mass between the arctic and the subtropical Atlantic. Even though previous studies have demonstrated the impact of the NAO on winter climate conditions in Europe and Northern Africa, it is still unclear to what extent the NAO is related to hydroclimatic patterns in Mediterranean areas and whether it can explain its recent drought history. To this end, this study investigates the interdependence between the NAO and winter precipitation, river flow and temperature in two Mediterranean regions: Southern Italy and Nile Delta (Egypt). The outcomes show the presence of significant connections between the NAO, winter rainfall and river discharge.
Related Papers (5)
Teleconnections in the Geopotential Height Field during the Northern Hemisphere Winter
John M. Wallace,David S. Gutzler +1 more
Decadal Trends in the North Atlantic Oscillation: Regional Temperatures and Precipitation
The NCEP/NCAR 40-Year Reanalysis Project
Eugenia Kalnay,Masao Kanamitsu,Robert Kistler,William D. Collins,D.G. Deaven,L. S. Gandin,M. Iredell,Suranjana Saha,Glenn H. White,John S. Woollen,Yuejian Zhu,Muthuvel Chelliah,Wesley Ebisuzaki,Wayne Higgins,John E. Janowiak,Kingtse C. Mo,Chester F. Ropelewski,Julian X. L. Wang,Ants Leetmaa,Richard W. Reynolds,Roy L. Jenne,Dennis Joseph +21 more