A climatology of pressure jumps around the Gulf of Carpentaria

Nudelman, Ilona; Smith, Roger K.; Reeder, Michael J.

doi:10.22499/2.6002.001

Cited by 11 publications

(13 citation statements)

References 9 publications

(14 reference statements)

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“…1) and was related to the observed water-level changes. We used Orlić's (1980) geometric expression to determine the air pressure disturbance's travelling speed (v) and direction (c) over the shelf (see also Garcies et al 1996;Š epić et al 2009;Nudelman et al 2010):…”

Section: Discussionmentioning

confidence: 99%

Observations of meteorological tsunamis along the south-west Australian coast

Pattiaratchi

Wijeratne

2014

Nat Hazards

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Tide gauge data were used to identify the occurrence, characteristics, and cause of tsunamis of meteorological origin (termed 'meteotsunamis') along the Western Australian coast. This is the first study to identify meteotsunamis in this region, and the results indicated that they occur frequently. Although meteotsunamis are not catastrophic to the extent of major seismically induced basin-scale events, the wave heights of meteotsunamis examined at some local stations in this study were higher than those recorded through seismic tsunamis. In June 2012, a meteotsunami contributed to an extreme water-level event at Fremantle, which recorded the highest water level in over 115 years. Meteotsunamis (wave heights [0.4 m, when the mean tidal range in the region is *0.5 m) were found to coincide with thunderstorms in summer and the passage of low-pressure systems during winter. Spectral analysis of tide gauge time series records showed that existing continental seiche oscillations (periods between 30 min and 5 h) were enhanced during the meteotsunamis, with a high proportion of energy transferred to the continental shelf oscillation period. Three recent meteotsunami events (22 March 2010, 10 June 2012, and 7 January 2013) two due to summer thunderstorms and one due to a winter frontal system were chosen for detailed analysis. The meteotsunami amplitudes were up to a factor 2 larger than the local tidal range and sometimes contributed up to 85 % of the non-tidal water signal. A single meteorological event was found to generate several meteotsunamis along the coast, up to 500 km apart, as the air pressure disturbance propagated over the continental shelf; however, the topography and local bathymetry of the continental shelf defined the local sea-level resonance characteristics at each location. With the available data (sea level and meteorological), the exact mechanisms for the generation of the meteotsunamis could not be isolated.

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Section: Discussionmentioning

confidence: 99%

Observations of meteorological tsunamis along the south-west Australian coast

Pattiaratchi

Wijeratne

2014

Nat Hazards

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“…The study by Nudelman et al () simply identified bores in the Gulf region of northern Australia as pressure jumps greater than 0.3 hPa within 3 min, and that method worked well for their study. However, the midlatitude data used here are noisier and have greater temporal variation due to the passage of weather systems.…”

Section: Methodsmentioning

confidence: 93%

“…However, the midlatitude data used here are noisier and have greater temporal variation due to the passage of weather systems. Consequently, the method used by Nudelman et al () was less successful in reliably identifying bores in the AWS data for southeastern Australia. Instead, the method used here is based on the shape recognition method of Belušić and Mahrt ().…”

Section: Methodsmentioning

confidence: 96%

“…(For details see the reviews by Smith (), Reeder and Smith (), and Smith and Reeder () and the references therein.) One study of particular relevance is that by Nudelman et al (), who, using one year of surface observations, constructed a climatology of pressure jumps in the Gulf of Carpentaria region. Among other things, they found that the pressure jumps were most common in the early hours of the morning during the summer months.…”

Section: Introductionmentioning

confidence: 99%

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A climatology of atmospheric pressure jumps over southeastern Australia

Davies

Reeder

Lane

2016

Quart J Royal Meteoro Soc

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Black Saturday provided the first evidence of an atmospheric bore affecting the behaviour of a bushfire. As the bore passed, the fire unexpectedly strengthened. This behaviour highlighted the lack of understanding of how common bores are in the southeastern part of Australia, a region of relatively high bushfire risk. The present study addresses that lack of understanding. Pressure jumps are identified in the 1 min records at four automatic weather stations in southeastern Australia by correlating the pressure time series with a large-amplitude step function. These jumps are then separated into two classes: bores and frontal pressure jumps. Bores are defined as pressure jumps without a change in relative humidity whereas frontal pressure jumps are defined by jumps with an accompanying decrease in temperature greater than 3 • C. About 15 pressure jumps per station per year are found. Most jumps are found in the spring and summer and fewest in winter. Bores are found most frequently in the early morning and late evening at most stations, whereas frontal pressure jumps are most frequently found in the late afternoon or early evening. Following their passage, frontal pressure jumps are associated with higher 30 min mean wind speeds than bores (9.0 and 6.1 m s −1 respectively), both of which are higher than climatology (4.7 m s −1 ).

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“…Climatology Nudelman et al (1977) presented a climatology of nocturnal or late morning pressure jumps at stations around the Gulf of Carpentaria and at one inland station south of the Top End. The climatology was based on one-minute average data from Bureau of Meteorology's AWSs.…”

Section: Favourable Synoptic Conditionsmentioning

confidence: 99%

A review of research on the dry season mesoscale meteorology of northern Australia

Smith¹,

Reeder²

2014

AMOJ

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Research on the structure and dynamics of a range of dry-season meteorological phenomena that occur around the Gulf of Carpenteria and parts of the arid interior of Australia is reviewed. These include: undular bores; sea breeze circulations; continental cold fronts in the tropics and subtropics; dry lines; and heat lows or heat troughs. The research was initiated by an expedition mounted in 1979 to gather data on the "Morning Glory", a spectacular cloud formation that occurs in the Gulf of Carpentaria region. The Morning Glory was found to have the structure of an undular bore. Studies of the other phenomena were stimulated by attempts to understand the origin of southerly Morning Glories. Some outstanding problems that have emerged from the research are discussed.

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A climatology of pressure jumps around the Gulf of Carpentaria

Cited by 11 publications

References 9 publications

Observations of meteorological tsunamis along the south-west Australian coast

Observations of meteorological tsunamis along the south-west Australian coast

A climatology of atmospheric pressure jumps over southeastern Australia

A review of research on the dry season mesoscale meteorology of northern Australia

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