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Planetary Waves over Antarctica

Authors: Andresen, Sigurd Nord;

Planetary Waves over Antarctica

Abstract

Denne oppgaven undersøker hypotesen lagt frem av Alan Plumb i 1989 med formålet om å forklare nedkjølingen midtvinter i mesosfæren over Antarktis. Fundamentet til denne hypotesen bygger på at de planetarisk bølgene ikke forplanter seg oppover i atmosfæren da vinden når en styrke som går over den øvre grensen til Charney-Drazin kriteriet. Dette resulterer i en oppbremsning av sirkulasjonen som fører til adiabatisk oppvarming av mesosfæren. De planetariske bølgene med bølgenummer en ble isolert fra vindataen sammen med vind- og temperaturmålinger fra NAVGEM for 2016. Forstyrrelser i uthentingen av de planetariske bølgene ble filtrert ut ved å bruke den daglige gjennomsnittlige vindmålingen. Videre ble korrelasjonen mellom temperaturen og planetariske bølger, samt en trend som kan underbygge Plumbs hypotese, fastslått. De planetariske bølgene ble redusert når vinden nådde maksimale verdier samtidig som temperaturen sank. Sent på vinteren over Antarktisk oppstod det en svak SSW, og den uberegnelige vintermesosfæren gjorde det vanskelig å konkludere rundt Plumb sin hypotese.

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
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