2010
DOI: 10.1029/2009jd013251
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Abstract: Cutoff lows (COLs) pressure systems climatology for the Southern Hemisphere (SH), between 10°S and 50°S, using the National Center for Environmental Prediction–National Center for Atmospheric Research (NCEP‐NCAR) and the ERA‐40 European Centre for Medium Range Weather Forecast (ECMWF) reanalyses are analyzed for the period 1979–1999. COLs were identified at three pressure levels (200, 300, and 500 hPa) using an objective method that considers the main physical characteristics of the conceptual model of COLs. I… Show more

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Cited by 57 publications
(105 citation statements)
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“…Such closed lows in the midtroposphere, detached from the westerly flow of the jet stream, occur more frequently around the three midlatitude SH continental landmasses during the cool season (Fuenzalida et al 2005;Reboita et al 2010, and references therein). Using synoptic decomposition for southeastern Australian rainfall events, Pook et al (2006) found 50% of the total cool-season (April-October) rainfall and 80% of high-rainfall events to be associated with cutoff low systems.…”
Section: Introductionmentioning
confidence: 94%
“…Such closed lows in the midtroposphere, detached from the westerly flow of the jet stream, occur more frequently around the three midlatitude SH continental landmasses during the cool season (Fuenzalida et al 2005;Reboita et al 2010, and references therein). Using synoptic decomposition for southeastern Australian rainfall events, Pook et al (2006) found 50% of the total cool-season (April-October) rainfall and 80% of high-rainfall events to be associated with cutoff low systems.…”
Section: Introductionmentioning
confidence: 94%
“…The methodology used to define COLs is very similar to that of Nieto et al (2005) and Reboita et al (2009), with a more explicit imposition of the cold-core condition similar to that in Fuenzalida et al (2005). The algorithm is a multiple step process, and has been applied to identify COLs on different pressure surfaces.…”
Section: Col Diagnosticsmentioning
confidence: 99%
“…The first step involves identifying minima on the 250 hPa (or 500 hPa) geopotential height fields on each day during the study period. A grid point is considered a potential COL point if its geopotential height value is lower than those of at least six of the eight immediate surrounding points by at least 10 gpm (Nieto et al, 2005;Reboita et al, 2009). Furthermore, the 250 hPa zonal wind is required to change direction at one or two of the grid points immediately south of all those satisfying the geopotential height minimum condition.…”
Section: Col Diagnosticsmentioning
confidence: 99%
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