Dynamical aspects of ozone mini-hole formation

Peters, D.; Egger, J.; Entzian, G.

doi:10.1007/bf01029827

Cited by 47 publications

(35 citation statements)

References 13 publications

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“…As a result, local relative vorticity anomalies show strong positive correlations with total ozone (Vaughan and Price, 1991). This was utilized by Peters et al (1995), who showed that the dynamics of vorticity and indeed isentropic potential vorticity (IPV) development could be used as a proxy for ozone mini-holes. On the other hand, Petzoldt et al (1994) have shown that anomalously cold air in the stratosphere is a further prerequisite for the formation of strong mini-holes, as confirmed in the modelling study of James et al (2000).…”

Section: Introductionmentioning

confidence: 99%

The Lagrangian structure of ozone mini-holes and potential vorticity anomalies in the Northern Hemisphere

James

Peters²

2002

Ann. Geophys.

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Abstract. An ozone mini-hole is a synoptic-scale area of strongly reduced column total ozone, which undergoes a growth-decay cycle in association with baroclinic weather systems. The tracks of mini-hole events recorded during the TOMS observation period over the Northern Hemisphere provide a database for building anomaly fields of various meteorological parameters, following each mini-hole center in a Lagrangian sense. The resulting fields provide, for the first time, a complete mean Lagrangian picture of the three-dimensional structure of typical ozone mini-holes in the Northern Hemisphere. Mini-holes are shown to be associated with anomalous warm anticyclonic flow in the upper troposphere and cold cyclonic anomalies in the middle stratosphere. Ascending air columns occur upstream and descent downstream of the mini-hole centers. Band-pass filtering is used to reveal the transient synoptic nature of miniholes embedded within larger scale circulation anomalies. Significant correlations between ozone and Ertel's potential vorticity on isentropes (IPV) both near the tropopause and in the middle stratosphere are shown and then utilized by reconstructing the Lagrangian analysis to follow local IPV anomalies instead of ozone minima. By using IPV as a proxy for ozone, the geopotential anomaly dipolar structure in the vertical characteristic of mini-holes is shown to result from a superposition of two largely independent dynamical components, stratospheric and tropospheric, typically operating on different time scales. Hence, ozone mini-holes may be viewed primarily as phenomena of coincidence.

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Section: Introductionmentioning

confidence: 99%

The Lagrangian structure of ozone mini-holes and potential vorticity anomalies in the Northern Hemisphere

James

Peters²

2002

Ann. Geophys.

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“…They are the result of horizontal and vertical movements of air masses which usually occur when warm air that is poor in ozone is transported towards the Pole and arrives to a region where anticyclones are originated (James, 1998). Reed (1950) established that the advection of air masses with low ozone levels is associated with these fluctuations, and Peters et al (1995) suggest that the mini-hole formation is due to the transportation of air masses with low ozone concentrations in a northerly direction from lower latitudes.…”

Section: Introductionmentioning

confidence: 99%

Ozone mini‐holes over Valencia (Spain) and their influence on the UV erythemal radiation

Martínez‐Lozano

Utrillas

Núñez

et al. 2011

Intl Journal of Climatology

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Low ozone level episodes (also known as mini-holes) have been analysed over Valencia, Spain, during the period from 1 January 2000 to 31 December 2007. In this study, 24 episodes, lasting 1 or 2 days each, were detected. Most of them can be explained dynamically by the existence of an anticyclone over the Azores, which sends air masses coming from the Caribbean over the Iberian Peninsula. A positive anomaly in the vertical temperature profile in the high troposphere and one negative anomaly in the medium and low stratosphere are also observed in most of the analysed episodes. The total ozone column decrease is accompanied by a rise in the UV erythemal radiation levels. This increase is quantified at 1.29 times the decrease in the total ozone column. This is known as the radiation amplification factor (RAF) of UV erythemal radiation.

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“…As shown by Peters et al (1995) and Peters and Waugh (1996) the zonally averaged or regionally enhanced anticyclonic basic wind shear determines the appearance of poleward Rossby wave breaking which is linked to ozone mini-holes. It has not yet been proved wether enhanced baroclinic wave activity undergoes a decadal change, and possibly causing a decadal ozone decrease.…”

Section: Discussionmentioning

confidence: 99%

Very low zonally asymmetric ozone values in March 1997 above the North Atlantic-European region, induced by dynamic processes

Entzian¹,

Peters²

1999

Ann. Geophys.

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Abstract. The total ozone distribution in March 1997 showed very low values in the North Atlantic-European region, even lower than in the years before. A spatial pattern correlation between the zonally asymmetric part of total ozone and that of the 300 hPa surface geopotential of the Northern Hemisphere was applied to examine the spatial structure of the low ozone values and its dynamic dependence. A trend analysis in the North Atlantic-European region was carried out to determine to what extent the low March 1997 ozone values are related to the decadal change of meteorological parameters in the lower stratosphere, observed since the 1980s, in comparison to the interannual variability. The conclusion is that the very low ozone values above the North Atlantic-European region in March 1997 were mainly induced by dynamic processes, namely their decadal change as well as their interannual variability.

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Dynamical aspects of ozone mini-hole formation

Cited by 47 publications

References 13 publications

The Lagrangian structure of ozone mini-holes and potential vorticity anomalies in the Northern Hemisphere

The Lagrangian structure of ozone mini-holes and potential vorticity anomalies in the Northern Hemisphere

Ozone mini‐holes over Valencia (Spain) and their influence on the UV erythemal radiation

Very low zonally asymmetric ozone values in March 1997 above the North Atlantic-European region, induced by dynamic processes

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