The latitude of the subtropical ridge over Eastern Australia: The L index revisited

  title={The latitude of the subtropical ridge over Eastern Australia: The L index revisited},
  author={Wasyl Drosdowsky},
  journal={International Journal of Climatology},
  • W. Drosdowsky
  • Published 1 August 2005
  • Environmental Science
  • International Journal of Climatology
Recent research has suggested that the position of the subtropical ridge in mean sea‐level pressure over eastern Australia, referred to as the L index, has undergone a substantial poleward shift over the past century. These findings are not supported by calculations of the L index based on daily National Centers for Environmental Prediction reanalysis from 1948 to 2002, and on monthly mean Australian pressure data from 1890 to 2003. Reasons for these differences are discussed, together with the… 
An assessment of relationships between the Australian subtropical ridge, rainfall variability, and high‐latitude circulation patterns
The monthly anomaly of the latitude of the subtropical ridge over eastern Australia (L) is a major regulator of synoptic‐scale influences on Australia's climate. Three datasets have been used to
Latitudinal positioning of the subtropical anticyclone along the Chilean coast
In the past various authors have investigated climatic change (CC) by using the latitude of the subtropical ridge in the mean sea-level pressure (MSLP) for a range of geographic regions. In this
Australian winter anticyclonicity, 1850–2006
[1] The latitude, longitude, and longitudinal extent of Australian winter anticyclonicity are reconstructed for the period 1850–2006 using the gridded mean sea level pressure data set of the Met
The continuing decline in South-East Australian rainfall - Update to May 2009
Most of South-Eastern Australia (SEA) has seen reduced rainfall since the late 1990s (National Climate Centre – NCC-, 2008). Murphy and Timbal (2008) (hereafter, MT08) described the ongoing dry
Changes in the Risk of Extratropical Cyclones in Eastern Australia
AbstractThe east coast of Australia is a region of the world where a particular type of extratropical cyclone, known locally as an east coast low, frequently occurs with severe consequences such as
Representation of the Australian sub‐tropical ridge in the CMIP3 models
This study examines the representation of one of the key drivers of southeastern Australian rainfall, the sub‐tropical ridge (STR) in mean sea level pressure, in the World Climate Research
Constraints on Southern Australian Rainfall Change Based on Atmospheric Circulation in CMIP5 Simulations
AbstractAtmospheric circulation change is likely to be the dominant driver of multidecadal rainfall trends in the midlatitudes with climate change this century. This study examines circulation
The relationship between the decline of Southeastern Australian rainfall and the strengthening of the subtropical ridge
During the 20th century and early 21st century, the subtropical ridge (STR) in the vicinity of eastern Australia has intensified significantly. While the position of the STR has often been the focus
Rainfall in Australia's eastern seaboard: a review of confidence in projections based on observations and physical processes
There is a high degree of variation in rainfall projections for later this century for Australia's eastern seaboard, partly because of how different climate models represent the relevant physical
Southern Australian rainfall and the subtropical ridge: Variations, interrelationships, and trends
Monthly values of the latitude and intensity (mean maximum pressure) of the subtropical ridge (STR), averaged across Australian longitudes (105–155°E), have been related to variations and trends in


An observed poleward shift of the southern hemisphere subtropical wind maximum—a greenhouse symptom?
A 16-year (1976-1991) record of mean winter values of the zonally averaged latitude of the subtropical wind maximum (STWM) in the Southern Hemisphere is examined, and reveals a significant trend
Climatic Change in Australia Since 1880
Australian climatic data show that, for the period 1911?1950, the summer rainfall over much of the southern part of the continent was considerably greater than in the previous 30 years and, for the
Global meridional interactions in stratosphere and troposphere
Significant correlations have been found between year to year mean latitudes of the surface high pressure belt, L, over eastern Australia and atmospheric parameters such as total ozone, winds and
Recent apparent changes in relationships between the El Niño-Southern Oscillation and Australian rainfall and temperature
High quality historical temperature and rainfall data sets have been used to produce time series of annual rainfall and temperature, averaged over Australia. The relationships between these series,
Interpretation of Recent Southern Hemisphere Climate Change
Evidence is presented that recent trends in the SH tropospheric circulation can be interpreted as a bias toward the high-index polarity of this pattern, with stronger westerly flow encircling the polar cap.
On the evolution of the southern oscillation
Abstract The evolution of the Southern Oscillation (SO) is examined in the time domain by computing lagged cross correlations between sea level pressures at Darwin and sea level or surface pressures
The ‘southern oscillation’
An attempt is made to obtain a coherent picture of the extent and mode of operation of the ‘southern oscillation.’ This term is used here, following Sir Gilbert Walker, to describe a standing
A climatology of Southern Hemisphere anticyclones
A climatology of anticyclones generated by an objective automatic scheme applied to 15 years of once-daily Australian Bureau of Meteorology hemispheric analyses is presented. Contour maps of the
Solar correlates of Southern Hemisphere mid‐latitude climate variability
Atmospheric circulation in the southern mid‐latitudes is dominated by strong circum‐Antarctic zonal west winds (ZWW) over the latitude range of 35 to 60°S. These winds exhibit coherent seasonal and
An analysis of Australian seasonal rainfall anomalies: 1950–1987. II: Temporal variability and teleconnection patterns
A detailed examination of the variability of Australian district rainfall of seasonal time-scales over the period 1950–1987 is described. In Part I, S- and T-mode rotated principal component analysis