Seasonal evolution of Rossby and gravity wave induced laminae in ozonesonde data obtained from Wallops Island, Virginia

Pierce, R. Bradley; Grant, William B.

doi:10.1029/98gl01507

Cited by 44 publications

(57 citation statements)

References 10 publications

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“…The vertical criterion detects a streamer, whenever the local perturbation of the N 2 O-profile, which is defined as the difference between the actual vertical profile and a 5-point vertical running-mean for every evaluated time step, exceeds more than 5% (Pierce and Grant, 1998). Also a perturbation from the zonal mean or a combination of a change in the vertical and horizontal gradient might be a possible way to detect streamers.…”

Section: Discussion Of Different Methodsmentioning

confidence: 99%

Climatologies of subtropical mixing derived from 3D models

Eyring¹,

Dameris²,

Grewe³

et al. 2003

Atmos. Chem. Phys.

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Abstract.Fingerlike structures reaching from lower into extra-tropical latitudes significantly contribute to the tropical-extratropical exchange of air masses. This is also an exchange of upper tropospheric and stratospheric air. Those so called streamers can, on a horizontal plane, be detected in N 2 O or O 3 since they are characterised by high N 2 O or low O 3 values compared to undisturbed mid-latitude values. A climatology of streamer events has been established, employing the chemical-transport model KASIMA, which is driven by ECMWF re-analyses (ERA) and operational analyses. For the first time, the seasonal and geographical distribution of streamer frequencies has been determined on the basis of 9 years of meteorological analyses.For the current investigation, a meridional gradient criterion has been newly formulated and applied to the N 2 O distributions calculated with KASIMA. A climatology has been derived by counting all streamer events between 21 and 25 km for the years 1990 to 1998. The results have been compared with a streamer climatology which has been established in the same way employing data of a multiyear simulation with the coupled chemistry-climate model

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Section: Discussion Of Different Methodsmentioning

confidence: 99%

Climatologies of subtropical mixing derived from 3D models

Eyring¹,

Dameris²,

Grewe³

et al. 2003

Atmos. Chem. Phys.

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“…Particularly at middle latitude, gravity waves undulate ozone profiles as shown e.g. by Reid et al (1998) and by Pierce and Grant (1998). An ozone excess over northwest Europe was already confined to the lower stratosphere in the earlier work from Mantis et al (1981).…”

Section: Introductionmentioning

confidence: 62%

Study of the seasonal ozone variations at European high latitudes

Werner¹,

Stebel²,

Hansen³

et al. 2011

Advances in Space Research

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The geographic area at high latitudes beyond the polar circle is characterized with long darkness during the winter (polar night) and with a long summertime insolation (polar day). Consequentially, the polar vortex is formed and the surrounding strong polar jet is characterized by a strong potential vorticity gradient representing a horizontal transport barrier. The ozone dynamics of the lower and middle stratosphere is controlled both by chemical destruction processes and transport processes. To study the seasonal ozone variation at high latitudes, ozone vertical distributions are examined, collected from the Arctic Lidar Observatory for Middle Atmosphere Research (ALOMAR) (69.3°N, 16.0°E,) station at Andenes and from the stations at Sodankylä (67.4°N, 26.6°E) and at 11.9°E). The data sets cover the time period from 1994 until 2004. We find a second ozone maximum near 13 -15 km, between the tropopause and the absolute ozone maximum near 17-20 km. The maximum is built up by the combination of air mass transport and chemical ozone destruction, mainly caused by the NOx catalytic cycle, which begins after the polar night and intensifies with the increasing day length. Formation of a troposphere inversion layer is observed. The inversion layer is thicker and reaches higher altitudes in winter rather than in summer. However, the temperature inversion during summer is stronger. The formation of an enhanced ozone number density is observed during the spring-summer period. The ozone is accumulated or becomes poor by synoptic weather patterns just above the tropopause from spring to summer. In seasonal average an ozone enhancement above the tropopause is obtained. The stronger temperature inversion during the summer period inhibits the vertical stratospheretroposphere exchange. The horizontal advection in the upper troposphere and lower stratosphere is enforced during summer. The combination of these mechanisms generates a layer with a very low ozone number density above the troposphere inversion layer subsisting from June/July until the late autumn.Suggested Reviewers : 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 AbstractThe geographic area at high latitudes beyond the polar circle is characterized with long darkness during the winter (polar night) and with a long summertime insolation (polar day). Consequentially, the polar vortex is formed and the surrounding strong polar jet is characterized by a strong potential vorticity gradient representing a horizontal transport barrier. The ozone dynamics of the lower and middle stratosphere is controlled both by chemical destruction processes and transport processes. To study the seasonal ozone variation at high latitudes, ozone vertical distributions are examined, collected from the Arctic Lidar Observatory for Middle Atmosphere Research (ALOMAR) (69.3°N, 16.0°E,)...

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“…As for the region dominated by ozone, it was in the tropics about half the time but outside about a third of the time. This enables the study of gravity waves which are generated by convection and the subtropical jet, respectively, during austral summer and winter in addition to possible in- shown that using such a threshold value underestimates the frequency of occurrence of laminae in the lower stratosphere, as Pierce and Grant [1998] proved by using a relative threshold value that takes into account the background values. Therefore a threshold value of 4% larger than the instrumental precision in the ozone mixing ratio is considered in our climatology.…”

Section: R(z) = •(--• O(z) ] ' (4)mentioning

confidence: 99%

“…The C-shaped trend in the ozone perturbation profiles around the tropopause height is retrieved from the vertical ozone perturbation profiles. The method proposed by Pierce and Grant [1998] ] might also be another explanation why detected short-scale structures induced by both gravity and Rossby waves are constrained to the altitudes below 21 km. In our study, possible limits to detecting very short scale laminar structures in the middle stratosphere could also be the filter width used to extract laminar structures (-> 1.2 km and _<4.8 km), the size of the window (3 km) for calculating the coefficients of correlation and the amount of temperature and ECC ozonesonde data (33%) at heights up to 30 km.…”

Section: Climatology Of Small-scale Structures Induced By Gravity Wavmentioning

confidence: 99%

“…To estimate the seasonal evolution of ozone laminae using ozonesonde data, Pierce and Grant [1998] recently proposed a method to identify perturbations of normalized potential temperature and ozone induced by gravity waves and the horizontal advection. This was applied to ECC ozonesonde data and potential temperature profiles for several stations from 25.0.5øS to 19.6øN in the tropics and subtropics [Grant etal., 1998].…”

Section: Climatology Of Small-scale Structures Induced By Gravity Wavmentioning

confidence: 99%

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Vertical short‐scale structures in the upper tropospheric and lower stratospheric temperature and ozone at la Réunion Island (20.8°S 55.3°E)

Chane-Ming¹,

Molinaro²,

Leveau³

et al. 2000

J. Geophys. Res.

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Abstract.The distribution and the nature of vertical short-scale structures observed in ozone and temperature are investigated in the upper troposphere and the lower stratosphere at La Reunion Island located in the vicinity of the southern subtropical barrier by using wavelet-based methods. A climatology of dominant wavelike patterns with short vertical wavelengths reveals the presence of localized structures on both the ozone and the temperature perturbations, extracted from ozonesonde and temperature data, up to the middle stratosphere. Some case studies are presented to identify the nature of short-scale structures with 1-to 5-km vertical wavelengths in the troposphere and the stratosphere. A climatology of short-scale structures induced by gravity waves and the horizontal advection shows that short-scale structures are mainly detected in the middle and upper troposphere and in the lower stratosphere. The weak value of the coefficient R(z) that links the ozone and temperature perturbations induced by gravity waves is a major limit to detecting such short-scale structures above 21-km altitude. Some structures with vertical wavelengths ranging from 1 to 5 km are attributed to gravity waves produced by convection in summer and the subtropical jet in winter, or quasi-horizontal large-scale motions from both sides of the subtropical barrier. T'(z, t)

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Seasonal evolution of Rossby and gravity wave induced laminae in ozonesonde data obtained from Wallops Island, Virginia

Cited by 44 publications

References 10 publications

Climatologies of subtropical mixing derived from 3D models

Climatologies of subtropical mixing derived from 3D models

Study of the seasonal ozone variations at European high latitudes

Vertical short‐scale structures in the upper tropospheric and lower stratospheric temperature and ozone at la Réunion Island (20.8°S 55.3°E)

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