Lorenzov energetski ciklus simuliran modelom SPEEDY i utjecaj ENSO-a

master's thesis

• Title (english): Lorenz energy cycle simulated with the model SPEEDY and the impact of ENSO
• Author: Tonko Bogovac
• Mentor: Ivana Herceg Bulić (mentor)
• Committee member: Ivana Herceg Bulić (predsjednik povjerenstva)
• Committee member: Zvjezdana Bencetić Klaić (član povjerenstva)
• Committee member: Josip Stipčević (član povjerenstva)
• Committee member: Željko Večenaj (član povjerenstva)
• Committee member: Ivica Sović (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Geophysics); Zagreb
• Defense date and country: 2019-09-26, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Geophysics; Meteorology and Climatology

Abstract

U ovom radu korišten je rezultat 35-članog ansambla simulacija modelom SPEEDY koji je forsiran donjim rubnim uvjetom u obliku površinske temperature mora kako bi se izvrijednili članovi energije u Lorenzovom ciklusu. Rezultantni članovi raspoložive poetncijalne energije i srednje zonalne kinetičke energije, te istoimeni članovi makroporemećaja prikazani su u pregledu za razdoblje od 1855. do 2010. godine u obliku srednjih godišnjih vrijednosti i srednjih sezonskih vrijednosti za sezone DJF i JJA, ali i u vertikalnom te u longitudionalno-vertikalnom presjeku. Izračunat je i NINO 3.4 indeks za određivanje faze El Niño - Južne oscilacije (ENSO), a na temelju indeksa određeni su El Niño i La Niña događaji, te su članovi Lorenzovog ciklusa promotreni dodatno u obliku kompozita za sve El Niño i La Niña događaje od 1855. do 2010. godine. Utvrđeno je da model SPEEDY zadovoljavajuće reproducira energiju zonalnog strujanja dok za članove makroporemećaja nije jednako uspješan. Utjecaj ENSO faza na članove Lorenzovog ciklusa je uočen i pokazao se najjačim za zimske hemisfere.

Abstract (english)

This thesis uses the products of a 35-member ensemble simulated with the model SPEEDY with forcing applied to the model’s lower boundary conditions in the form of sea surface temperatures to calculate energy reservoirs in the Lorenz energy cycle. Available potential energy and mean kinetic energy, as well as their eddy counterparts, are evaluated for the time period from 1855 until 2010 in the form of yearly averages as well as seasonal averages for the DJF and JJA seasons with their vertical profiles and longitude-altitude cross sections also discussed. NINO 3.4 index is calculated for the aforementioned time interval, allowing for the identification of El Niño - Southern Oscillation phases, El Niño and La Niña, and the discussion of Lorenz energy cycle in the context of those events. Model SPEEDY adequately reproduces zonal-mean energy while the same is not true for eddy energy. ENSO is shown to have an impact on Lorenz energy cycle components with the greatest impact in the winter hemisphere.

• Keywords: Lorenzov energetski ciklus; model SPEEDY; El Niño - Južna oscilacija; ENSO; El Niño; La Niña
• Keywords (english): Lorenz energy cycle; model SPEEDY; El Niño - Southern Oscillation; ENSO; El Niño; La Niña
• Language: croatian
• URN:NBN: urn:nbn:hr:217:025013
• Study programme: Title: Graduate university study pf Physics - Geophysics; specializations in: Seismology and Physics of the Earth's Interior, Meteorology and Physical Oceanography; Course: Meteorology and Physical Oceanography; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra fizike – geofizike (magistar/magistra fizike – geofizike)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2019-10-02 13:17:08