Vertical mixing in the lower troposphere by mountain waves over Arctic Scandinavia

Document identifier: oai:DiVA.org:ltu-7641
Access full text here:10.5194/acpd-11-31475-2011
Keyword: Engineering and Technology, Mechanical Engineering, Aerospace Engineering, Teknik och teknologier, Maskinteknik, Rymd- och flygteknik, Rymdteknik, Space Technology
Publication year: 2011
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Abstract:

Measurements made by ozonesondes and by a 52 MHz wind-profiling radar during February and March 1997 are studied. The radar is located at Esrange, near Kiruna in Arctic Sweden, on the eastern flank of the Scandinavian mountains. Daily ozonesondes were launched from the same site. The radar vertical and horizontal wind measurements are used to identify times when mountain waves were present. Mean vertical gradients in ozone mixing ratio in the lower troposphere are determined in conditions with mountain waves present and when they were absent. Back-trajectories were calculated so that only air-masses with their origin to the west of the mountains were included in the final averages. The vertical gradient in ozone mixing ratio is found to be about twice as steep outside wave conditions as it is during mountain waves. This suggests a very high rate of vertical mixing, with an average eddy diffusivity of order 5000 m2 s−1. This is consistent with an earlier estimate of the occurrence rate of complete mixing by wave breaking over the mountain range.

Authors

Maria Mihalikova

Luleå tekniska universitet; Institutionen för system- och rymdteknik
Other publications >>

Sheila Kirkwood

Luleå tekniska universitet; Rymdteknik
Other publications >>

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        identifier: oai:DiVA.org:ltu-7641
        datestamp: 2021-04-19T11:02:37Z
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                version: 3.7
            recordInfo: 
                recordContentSource: ltu
                recordCreationDate: 2016-09-29
            identifier: 
                http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-7641
                10.5194/acpd-11-31475-2011
                60afce1f-3308-4015-b07e-33194ac6904d
            titleInfo: 
                @attributes: 
                    lang: eng
                title: Vertical mixing in the lower troposphere by mountain waves over Arctic Scandinavia
            abstract: 
Measurements made by ozonesondes and by a 52 MHz wind-profiling radar during February and March 1997 are studied. The radar is located at Esrange near Kiruna in Arctic Sweden on the eastern flank of the Scandinavian mountains. Daily ozonesondes were launched from the same site. The radar vertical and horizontal wind measurements are used to identify times when mountain waves were present. Mean vertical gradients in ozone mixing ratio in the lower troposphere are determined in conditions with mountain waves present and when they were absent. Back-trajectories were calculated so that only air-masses with their origin to the west of the mountains were included in the final averages. The vertical gradient in ozone mixing ratio is found to be about twice as steep outside wave conditions as it is during mountain waves. This suggests a very high rate of vertical mixing with an average eddy diffusivity of order 5000 m2 s−1. This is consistent with an earlier estimate of the occurrence rate of complete mixing by wave breaking over the mountain range.

            subject: 
                    @attributes: 
                        lang: eng
                        authority: uka.se
                    topic: 
                        Engineering and Technology
                        Mechanical Engineering
                        Aerospace Engineering
                    @attributes: 
                        lang: swe
                        authority: uka.se
                    topic: 
                        Teknik och teknologier
                        Maskinteknik
                        Rymd- och flygteknik
                    @attributes: 
                        lang: swe
                        authority: ltu
                    topic: Rymdteknik
                    genre: Research subject
                    @attributes: 
                        lang: eng
                        authority: ltu
                    topic: Space Technology
                    genre: Research subject
            language: 
                languageTerm: eng
            genre: 
                publication/journal-article
                ref
            note: 
                Published
                2
                Validerad; 2011; 20160610 (andbra)
            name: 
                    @attributes: 
                        type: personal
                        authority: ltu
                    namePart: 
                        Mihalikova
                        Maria
                    role: 
                        roleTerm: aut
                    affiliation: 
                        Luleå tekniska universitet
                        Institutionen för system- och rymdteknik
                    nameIdentifier: marmih
                    @attributes: 
                        type: personal
                        authority: ltu
                    namePart: 
                        Kirkwood
                        Sheila
                    role: 
                        roleTerm: aut
                    affiliation: 
                        Luleå tekniska universitet
                        Rymdteknik
                    nameIdentifier: shekir
            originInfo: 
                dateIssued: 2011
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                @attributes: 
                    type: host
                titleInfo: 
                    title: Atmospheric Chemistry And Physics
                identifier: 
                    1680-7316
                    1680-7324
                part: 
                    detail: 
                        @attributes: 
                            type: volume
                        number: 11
                    extent: 
                        start: 31475
                        end: 31493
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                form: print
            typeOfResource: text