Wave activity (planetary, tidal) throughout the middle atmosphere (20-100km) over the CUJO network: Satellite (TOMS) and Medium Frequency (MF) radar observations

Manson, A. H.; Meek, C. E.; Chshyolkova, T.; Avery, S. K.; Thorsen, Denise; MacDougall, J. W.; Hocking, W. K.; Murayama, Yasuhiro; Igarashi, K.

doi:10.5194/angeo-23-305-2005

Cited by 15 publications

(16 citation statements)

References 36 publications

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“…successfully studied the Arctic stratosphere for 1991/1992. We have also used MetO data in conjunction with TOMS (Total Ozone Mapping Spectrometer) and MF radar data in earlier studies (Chshyolkova et al, 2005 Froidevaux et al (2006) show that temperatures and mixing ratios of O 3 , H 2 O, N 2 O, HCl, HNO 3 , and CO agree well with other satellite and meteorological datasets, as well as with balloon-measurements in the stratospheric and mesospheric regions. This paper was completed using Aura-MLS data in version 1.5 form, as version 2.2 data were not all available.…”

Section: Meto Datamentioning

confidence: 83%

“…The authors of this paper began their research with medium frequency radars, measuring electron densities or winds (60-90 km), and establishing relationships between planetary waves of the lower stratosphere and associated variabilities in the mesosphere-lower thermosphere (MLT). The studies have become more global with time Manson, 1970, 1975;Labitzke et al, 1987;Manson et al, 2002Manson et al, , 2005Chshyolkova et al, 2005Chshyolkova et al, , 2006Chshyolkova et al, , 2007Chshyolkova et al, , 2008. While ground-based observations continue to have great value due to their high time resolution, especially when networks are available, studies that also include global satellite observations are now of greatest value.…”

Section: Introductionmentioning

confidence: 99%

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Regional stratospheric warmings in the Pacific-Western Canada (PWC) sector during winter 2004/2005: implications for temperatures, winds, chemical constituents and the characterization of the Polar vortex

2008

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Abstract. The vortex during winter 2004/2005 was interesting for several reasons. It has been described as "cold" stratospherically, with relatively strong westerly winds. Losses of ozone until the final warming in March were considerable, and comparable to the cold 1999–2000 winter. There were also modest warming events, indicated by peaks in 10 hPa zonal mean temperatures at high latitudes, near 1 January and 1 February. Events associated with a significant regional stratospheric warming in the Pacific-Western Canada (PWC) sector then began and peaked toward the end of February, providing strong longitudinal variations in dynamical characteristics (Chshyolkova et al., 2007; hereafter C07). The associated disturbed vortex of 25 February was displaced from the pole and either elongated (upper) or split into two cyclonic centres (lower). Observations from Microwave Limb Sounder (MLS) on Aura are used here to study the thermal characteristics of the stratosphere in the Canadian-US (253° E) and Scandinavian-Europe (16° E) sectors. Undisturbed high latitude stratopause (55 km) zonal mean temperatures during the mid-winter (December–February) reached 270 K, warmer than empirical-models such as CIRA-86, suggesting that seasonal polar warming due to dynamical influences affects the high altitude stratosphere as well as the mesosphere. There were also significant stratopause differences between Scandinavia and Canada during the warming events of 1 January and 1 February, with higher temperatures near 275 K at 16° E. During the 25 February "PWC" event a warming occurred at low and middle stratospheric heights (10–30 km: 220 K at 253° E) and the stratopause cooled; while over Scandinavia-Europe the stratosphere below ~30 km was relatively cold at 195 K and the stratopause became even warmer (>295 K) and lower (~45 km). The zonal winds followed the associated temperature gradients so that the vertical and latitudinal gradients of the winds differed strongly between Scandinavia-Europe and Canada-US. The data-archive of Aura-MLS was also used to produce height versus latitude contours of ozone and related constituents, using mixing ratios (r) for ClO, N2O and HCl, for the 16° E and 253° E sectors. The Q-diagnostic was used to display the positions of the cyclonic (polar) vortex, using data from the UK Meteorological Office (MetO) analyses. ClO/HCL maxima/minima occurred on 1 February in both sectors, consistent with loss of ozone by heterogeneous chemistry. Low N2O values at high latitudes indicated that both sectors were inside the polar vortex, Time-difference plots show greater reductions in O3 in the Canadian sector. For the 25 February PWC warming event, O3-rich air from lower latitudes continued to be excluded from Europe, while O3 penetrated to at least 82° N over the Canadian sector. The contours for ClO, N2O and HCl at 16° E are consistent with continued ozone loss within the vortex during the event. Finally the thermal and chemical changes at these 16° E and 253° E sectors are placed into a hemispheric context using polar-cylindrical plots, with the following results. Firstly, the mixing ratios of O3, ClO, HNO3, HCL and the temperatures from Aura-MLS were consistent with consensus views of heterogeneous chemistry. Secondly, and consistent with the polar plots of C07, the vortices and their edges were strongly distorted during the 1 January, 1 and 25 February warming events, with sinusoidal shapes consistent with stationary planetary waves of wave-numbers 1 and 2. Thirdly, the distributions of the chemicals followed the curvatures (cyclonic and anticyclonic) of the vortex edges with O3 losses occurring at the cold cyclonic locations. During February these were over Scandinavia-Western Europe and Central-Eastern Canada. Trajectory analysis was applied to the two February warming events. For the 1 February event, the rotation time for air parcels within the peanut-shaped vortex was 3–4 days; while the O3-rich low latitude air that entered the Pacific-Western Canada sector during the 25 February event, showed no signs of becoming trapped within the highly distorted but still strong remnant of the polar vortex.

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Section: Meto Datamentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Regional stratospheric warmings in the Pacific-Western Canada (PWC) sector during winter 2004/2005: implications for temperatures, winds, chemical constituents and the characterization of the Polar vortex

2008

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“…These are known as Rossby waves (oceanic and atmospheric). The atmospheric Rossby waves usually have periodicities of 2, 6, 10 and 16 days (Talaat et al, 2001;Manson et al, 2005;Pancheva et al, 2006). Only the 2-and 6-day waves propagate vertically from the stratosphere to the mesosphere/lower thermosphere (MLT) region and reach the ionosphere (Fig.…”

Section: Discussionmentioning

confidence: 99%

Influence of temperature on the infradian growth rhythm inUlva lactuca(Chlorophyta)

Kalita

Titlyanov

2013

European Journal of Phycology

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The vegetative growth of Ulva lactuca was studied to determine if the growth rate of the alga is driven by infradian rhythmicity. The influence of temperature on the infradian rhythm of growth was also investigated. Discs of Ulva were grown in controlled laboratory conditions at different combinations of temperature (5, 10, 15, 20°С) and irradiance (40 and 60 μmol photons m -2 s -1 ) under 12 : 12 h light : dark cycles. The growth rates exhibited a rhythmic pattern with one major peak every 2 or 3 days. Growth at 5 or 10°С increased the prevalence of 3-day cycles and maintained U. lactuca in the vegetative growth stage. In contrast, growth at 15 or 20°С provoked a predominance of the 2-day cycle and induced reproduction. The 2-or 3-day cycles were combined in longer cycles having a period close to 6 days. We suppose that the 2-, 3-and 6-day rhythms of physiological processes are related to large-scale Rossby and Kelvin waves, which produce oscillations in the geomagnetic field and seawater temperature with the same periods. The predominance of 2-day or 3-day fluctuations of the geomagnetic field and temperature probably determine the prevalence of reproduction and vegetative growth, respectively, in Ulva.

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“…Wavelet analyses applied to winds data from the two Arctic radars, Tromso and Saskatoon. The analysis method is described fully in Manson et al (2005). The dominance of the semidiurnal tide at Svalbard and the diurnal tide at Eureka is clearly evident.…”

Section: Planetary Wavesmentioning

confidence: 99%

“…We provide wavelets in Fig. 13 for the annual variations of the EW and NS winds at 88 km over the 12 months of 2006: a detailed description of the analysis method for the wavelet is provided in Manson et al (2005). These are for Eureka, Svalbard and southern neighbor Tromso, as well as for Saskatoon whose PW data have often been compared to Tromso (we collaboratively operate the Tromso and Eureka radars).…”

Section: Planetary Wavesmentioning

confidence: 99%

Arctic tidal characteristics at Eureka (80° N, 86° W) and Svalbard (78° N, 16° E) for 2006/07: seasonal and longitudinal variations, migrating and non-migrating tides

et al. 2009

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NMT with s=0, +2 (westward) dominate in non-summer months, while for the semi-diurnal tide NMT with s=+1, +3 occur most often during equinoctial or early summer months. These wave numbers are consistent with stationary planetary wave (SPW)-tidal interactions.Assessment of the global topographic forcing and atmospheric propagation of the SPW (S=1, 2) suggests these winter waves of the Northern Hemisphere are associated with the 78-80 • N diurnal NMT, but that the SPW of the Southern Hemisphere winter have little influence on the summer Arctic tidal fields. In contrast the large SPW and NMT of the Arctic winter may be associated, consistent with Antarctic observations, with the observed occurrence of the semidiurnal NMT in the Antarctic summer.

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Wave activity (planetary, tidal) throughout the middle atmosphere (20-100km) over the CUJO network: Satellite (TOMS) and Medium Frequency (MF) radar observations

Cited by 15 publications

References 36 publications

Regional stratospheric warmings in the Pacific-Western Canada (PWC) sector during winter 2004/2005: implications for temperatures, winds, chemical constituents and the characterization of the Polar vortex

Regional stratospheric warmings in the Pacific-Western Canada (PWC) sector during winter 2004/2005: implications for temperatures, winds, chemical constituents and the characterization of the Polar vortex

Influence of temperature on the infradian growth rhythm inUlva lactuca(Chlorophyta)

Arctic tidal characteristics at Eureka (80° N, 86° W) and Svalbard (78° N, 16° E) for 2006/07: seasonal and longitudinal variations, migrating and non-migrating tides

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