prikaz prve stranice dokumenta Analiza vertikalnih strujanja u tropskom konvektivnom graničnom sloju tijekom mjerne kampanje DACCIWA
  Download
PDF 2.85 MB
master's thesis
Analiza vertikalnih strujanja u tropskom konvektivnom graničnom sloju tijekom mjerne kampanje DACCIWA
Zagreb: University of Zagreb, Faculty of Science, 2020. urn:nbn:hr:217:789684
Golem, Petar
University of Zagreb
Faculty of Science
Department of Geophysics

Institutional repository: Repository of the Faculty of Science

Cite this document

Golem, P. (2020). Analiza vertikalnih strujanja u tropskom konvektivnom graničnom sloju tijekom mjerne kampanje DACCIWA (Master's thesis). Zagreb: University of Zagreb, Faculty of Science. Retrieved from https://urn.nsk.hr/urn:nbn:hr:217:789684

Golem, Petar. "Analiza vertikalnih strujanja u tropskom konvektivnom graničnom sloju tijekom mjerne kampanje DACCIWA." Master's thesis, University of Zagreb, Faculty of Science, 2020. https://urn.nsk.hr/urn:nbn:hr:217:789684

Golem, Petar. "Analiza vertikalnih strujanja u tropskom konvektivnom graničnom sloju tijekom mjerne kampanje DACCIWA." Master's thesis, University of Zagreb, Faculty of Science, 2020. https://urn.nsk.hr/urn:nbn:hr:217:789684

Golem, P. (2020). 'Analiza vertikalnih strujanja u tropskom konvektivnom graničnom sloju tijekom mjerne kampanje DACCIWA', Master's thesis, University of Zagreb, Faculty of Science, accessed 25 December 2024, https://urn.nsk.hr/urn:nbn:hr:217:789684

Golem P. Analiza vertikalnih strujanja u tropskom konvektivnom graničnom sloju tijekom mjerne kampanje DACCIWA [Master's thesis]. Zagreb: University of Zagreb, Faculty of Science; 2020 [cited 2024 December 25] Available at: https://urn.nsk.hr/urn:nbn:hr:217:789684

P. Golem, "Analiza vertikalnih strujanja u tropskom konvektivnom graničnom sloju tijekom mjerne kampanje DACCIWA", Master's thesis, University of Zagreb, Faculty of Science, Zagreb, 2020. Available at: https://urn.nsk.hr/urn:nbn:hr:217:789684

Metadata
TitleAnaliza vertikalnih strujanja u tropskom konvektivnom graničnom sloju tijekom mjerne kampanje DACCIWA
Title (english)Analysis of vertical motions in tropical convective boundary layer during DACCIWA field campaign
AuthorPetar Golem
MentorMaja Telišman Prtenjak (mentor)
MentorKarmen Babić (mentor)
Committee memberMaja Telišman Prtenjak (predsjednik povjerenstva)
Committee memberŽeljko Večenaj (član povjerenstva)
Committee memberMarijan Herak (član povjerenstva)
Committee memberBranko Grisogono (član povjerenstva)
Committee memberIva Dasović (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Science
(Department of Geophysics)
Zagreb
Defense date and country2020-09-24, Croatia
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Geophysics
Meteorology and Climatology
Abstract
Doppler lidarska mjerenja vertikalne brzine provedena u okolici Savè-a (Benin) u sklopu projekta DACCIWA iz 2016. godine korištena su kako bi se okarakterizirala statistička svojstva konvektivnih vertikalnih strujanja u tropskom konvektivnom graničnom sloju (CBL-u). Metoda uvjetnog uzorkovanja korištena je kako bi se identificirala i odvojila silazna i uzlazna strujanja. Odabrana su dva slučaja rano poslijepodnevnog CBL-a – jedan s formacijom plitkih kumulusa i jedan bez. Vrijednosti statističkih veličina normaliziranih skalama sloja miješanja u oba režima nisu pokazale značajnije razlike. Uzlazna strujanja su zauzimala oko 18–23%, a silazna 50–53% vremenskog zapisa na oba dana. Prosječne širine uzlaznih strujanja iznose oko 0.22–0.28zi, dok su širine silaznih oko 1.5 puta veće. Prosječne vertikalne brzine unutar strujanja iznose oko 0.51–0.56w∗ u oba smjera. Vertikalne brzine unutar strujanja ovise o širini istog. Vertikalne brzine rastu od 0.4w∗ za strujanja manjih dimenzija (manjih od oko 0.2zi) do 0.8w∗ za strujanja širine graničnog sloja. Brzine u silaznim strujanjima su oko 20% manjih iznosa u slučaju širih strujanja. Krivulje ove ovisnosti skalirane skalama sloja miješanja jednake su u oba odabrana slučaja. Zaključujemo da u odabranom slučaju prisustvo plitkih kumulusa, bar što se tiče statističkih veličina vertikalnih strujanja, nije imalo značajniji utjecaj na razvoj i stanje graničnog sloja.
Abstract (english)
Doppler lidar measurements of vertical velocity taken outside Savè (Benin) as a part of the DACCIWA program that ran trough the June and July of 2016 are utilized to characterize the statistical properties of the convective vertical motions in the tropical CBL. Method of conditional sampling is used to identify and separate updrafts from downdrafts. Two cases of early afternoon CBL are chosen – one with formation of shallow cumulus clouds and one without. Updraft and downdraft statistics, once normalized by mixed layer scales, do not show significant variation between the two regimes. Updraft stake up about 18–23%, and downdrafts 50–53% of the lidar timeb series. Average updraft widths range from 0.22zi to 0.28zi, and downdrafts are about 1.5 times wider. Draft–mean vertical velocity is 0.51–0.56w∗ in both directions. Draft–mean vertical velocities show dependence on the draft's width. Vertical velocities increase from about 0.4w∗ for smaller drafts (smaller than about 0.2zi) to 0.8w∗ for drafts with widths equal to BL depth. Downdraft–mean velocities are about 20% weaker for large draft widths. Once normalized by mixed layer scales, curves of this dependence for the two chosen cases collapse onto each other. We conclude that, inasmuch draft statistics are concerned, presence of shallow cumuli did not have a large impact on development and state of the BL.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:217:789684
Study programmeTitle: Graduate university study pf Physics - Geophysics; specializations in: Seismology and Physics of the Earth's Interior, Meteorology and Physical Oceanography
Course: Seismology and Physics of the Earth's Interior
Study programme type: university
Study level: graduate
Academic / professional title: magistar/magistra fizike – geofizike (magistar/magistra fizike – geofizike)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2020-10-13 08:25:36