A Summertime Antarctic Mesocyclone Event over the Southern Pacific during FROST SOP-3: A Mesoscale Analysis Using AVHRR, SSM/I, ERS, and Numerical Model Data

Lieder, Michael; Heinemann, Günther

doi:10.1175/1520-0434(1999)014<0893:asameo>2.0.co;2

Cited by 17 publications

(4 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The FROST synoptic reanalyses [ Hutchinson et al , 1999] incorporated all available data, including those from the Antarctic automatic weather stations (AWSs) and also the retrievals of tropospheric wind and moisture from passive and active microwave sensors comprising the TIROS Operational Vertical Sounder (TOVS), the Defense Meteorological Satellite Program (DMSP) Special Sensor Microwave/Imager (SSM/I), and the European Remote Sensing satellite (ERS) [ Colwell and Turner , 1999; Jacka , 1999; Marshall and Turner , 1999]. These and other analyses, such as those from the European Centre for Medium‐Range Weather Forecasts (ECMWF), permit detailed investigations of synoptic and subsynoptic cyclones over the Southern Ocean [ Lieder and Heinemann , 1999] and enhance our understanding of the larger‐scale variability of the atmospheric circulation over the SH extratropics on monthly and longer timescales [ Simmonds and Murray , 1999]. However, the representativeness of short time periods characterized by intensive monitoring, in the context of the longer‐term “climatology,” remains in doubt.…”

Section: Characteristics Of the Databasementioning

confidence: 99%

Atmospheric teleconnections involving the Southern Ocean

Carleton¹

2003

J. Geophys. Res.

111

View full text Add to dashboard Cite

[1] I review the characteristic patterns of low-frequency (interannual and subdecadal) variation in atmospheric circulation over the Southern Hemisphere (SH) extratropics and their climatic associations (e.g., temperature, precipitation, winds, sea surface temperatures (SSTs), and sea ice conditions) for the Southern Ocean. The considerable spatial and temporal limitations of the observational database have strongly conditioned the pace of our understanding of SH teleconnections, particularly for the Pacific sector, where the tropical El Niño-Southern Oscillation (ENSO) exerts a dominant influence: an ENSO signal appears in the intensity interannual variations of the Amundsen Sea mean low pressure (ASL), jet streams, and long waves. These variations comprise the so-called Pacific-South America (PSA) teleconnection. Patterns of low-frequency variability in SH circulation that are mostly extratropical in origin, but which can interact with ENSO, are dominated by the zonally symmetric ''high-latitude mode'' or Antarctic Oscillation (AAO). The AAO involves an alternation of atmospheric mass between middle and high southern latitudes. A zonally asymmetric mode of wave number 1 is represented by an oscillation in pressure/ height between Australian and South American sectors, depicted by a ''Trans-Polar'' circulation index. A significant wave number 2 oscillation in the coupled atmosphereocean-ice system or Antarctic circumpolar wave (ACW) has a similar periodicity to ENSO and is strongest in the Pacific-SW Atlantic sectors. Atmospheric teleconnections involving the Southern Ocean, including those to ENSO, show evidence of recent changes, and the climatic implications of these are discussed.

show abstract

Section: Characteristics Of the Databasementioning

confidence: 99%

Atmospheric teleconnections involving the Southern Ocean

Carleton¹

2003

J. Geophys. Res.

111

View full text Add to dashboard Cite

show abstract

“…The use of scatterometer data is restricted to the ice-free ocean, but a clear signal of the MC (marked M2) with wind speeds of 15-20 ms -1 can be seen in the NSCAT wind field. Although NSCAT has a better capability to detect MCs compared to the ERS scatterometer (see Lieder & Heinemann 1999), MCs of a typical size of 200-300 km are still difficult to detect because of the coarse scatterometer resolution and data gaps (see Figure 6). The synoptic situation at 0600 UTC 1 April 1997 is displayed in Figure 7.…”

Section: The MC Event Of 1-2 April 1997mentioning

confidence: 99%

Interaction of katabatic winds and mesocyclones near the eastern coast of Greenland

Klein

Heinemann

2002

Meteorological Applications

View full text Add to dashboard Cite

show abstract

“…The eastern Canadian waters (Davis Strait, Baffin Bay and Hudson Bay) are also genesis regions and occasionally, during intense cold northerly outbreaks, the north of the United Kingdom is prone to polar lows too [ Hewson et al , 2000]. Considerable insight into the structure and dynamics of polar lows has followed advances in remote sensing techniques [e.g., Claud et al , 1993, 2004; Carleton et al , 1995; Heinemann , 1996; Rasmussen et al , 1996; McMurdie et al , 1997; Lieder and Heinemann , 1999]. There is a range of conditions leading to the development of such systems, sometimes referred to as the “polar low spectrum” [ Rasmussen and Turner , 2003].…”

Section: Introductionmentioning

confidence: 99%

Associations between large‐scale atmospheric circulation and polar low developments over the North Atlantic during winter

2007

View full text Add to dashboard Cite

Polar lows are intense mesoscale weather systems which develop in response to combinations of upper tropospheric vorticity advection, low‐level baroclinicity near the sea ice‐ocean margin and strong air‐sea thermodynamical fluxes. In this paper, an evaluation of the associations between dominant patterns of low‐frequency variability in the atmospheric circulation and polar low developments over the North Atlantic during winter is presented. Because polar lows are rather poorly represented in reanalyses, the temperature (T500) and geopotential height at 500 hPa, the wind at 925 hPa, the SST, and the difference (SST‐T500), which are critical for their formation, are considered. The North Atlantic Oscillation (NAO) has a strong impact on all these variables, but it is contrasted spatially and temporally. Polar low formation is stimulated in the Labrador Sea for a positive NAO phase, while over the Norwegian Sea, there is an increase of polar lows forming on the flank of synoptic storms. Still over the Norwegian Sea, higher SST from January on favor the formation of polar lows of predominantly convective nature, while to the east of Greenland, the reduction of sea ice plus the northerly low‐level flow lead to a larger number of polar lows. Other teleconnection patterns also exhibit associations with polar low developments. The Scandinavia pattern shows a strong negative association with the studied variables over the Norwegian and Barents seas, but only marginally affects the Labrador Sea. The formation of polar lows is encouraged over the Norwegian and Greenland seas when the Polar/Eurasia pattern is in its negative phase.

show abstract

A Summertime Antarctic Mesocyclone Event over the Southern Pacific during FROST SOP-3: A Mesoscale Analysis Using AVHRR, SSM/I, ERS, and Numerical Model Data

Cited by 17 publications

References 20 publications

Atmospheric teleconnections involving the Southern Ocean

Atmospheric teleconnections involving the Southern Ocean

Interaction of katabatic winds and mesocyclones near the eastern coast of Greenland

Associations between large‐scale atmospheric circulation and polar low developments over the North Atlantic during winter

Contact Info

Product

Resources

About