On the Arctic Seasonal Cycle

↓ Direkt till sidans innehåll
↓ Direkt till sidans sekundära innehåll (sidomenyn)

Sökning: onr:"swepub:oai:DiVA.org:su-100008" > On the Arctic Seaso...

1 av 1
Föregående post
Nästa post
Till träfflistan

Mortin, Jonas,1981-Stockholms universitet,Meteorologiska institutionen (MISU) (författare)

On the Arctic Seasonal Cycle

BokEngelska2014

Förlag, utgivningsår, omfång ...

Stockholm :Department of Meteorology, Stockholm University,2014
38 s.
electronicrdacarrier

Nummerbeteckningar

LIBRIS-ID:oai:DiVA.org:su-100008
ISBN:9789174478464
https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-100008URI

Kompletterande språkuppgifter

Språk:engelska
Sammanfattning på:engelska

Ingår i deldatabas

SwePubSwePub

Klassifikation

Ämneskategori:vet swepub-contenttype
Ämneskategori:dok swepub-publicationtype

Anmärkningar

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 1: In press. Paper 4: Submitted.
The seasonal cycle of snow and sea ice is a fundamental feature of the Arctic climate system. In the Northern Hemisphere, about 55 million km2 of sea ice and snow undergo complete melt and freeze processes every year. Because snow and sea ice are much brighter (higher albedo) than the underlying surface, their presence reduces absorption of incoming solar energy at high latitudes. Therefore, changes of the sea-ice and snow cover have a large impact on the Arctic climate and possibly at lower latitudes. One of the most important determining factors of the seasonal snow and sea-ice cover is the timing of the seasonal melt-freeze transitions. Hence, in order to better understand Arctic climate variability, it is key to continuously monitor these transitions.This thesis presents an algorithm for obtaining melt-freeze transitions using scatterometers over both the land and sea-ice domains. These satellite-borne instruments emit radiation at microwave wavelengths and measure the returned signal. Several scatterometers are employed: QuikSCAT (1999–2009), ASCAT (2009–present), and OSCAT (2009–present). QuikSCAT and OSCAT operate at Ku-band (λ=2.2 cm) and ASCAT at C-band (λ=5.7 cm), resulting in slightly different surface interactions. This thesis discusses these dissimilarities over the Arctic sea-ice domain, and juxtaposes the time series of seasonal melt-freeze transitions from the three scatterometers and compares them with other, independent datasets.The interactions of snow and sea ice with other components of the Arctic climate system are complex. Models are commonly employed to disentangle these interactions. But this hinges upon robust and well-formulated models, reached by perpetual testing against observations. This thesis also presents an evaluation of how well eleven state-of-the-art global climate models reproduce the Arctic sea-ice cover and the summer length—given by the melt-freeze transitions—using surface observations of air temperature.

Ämnesord och genrebeteckningar

NATURVETENSKAP Geovetenskap och miljövetenskap Klimatforskning hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences Climate Research hsv//eng
Arctic climate
Seasonal melt-freeze transitions
Arctic sea ice and snow
Active microwave measurements
Climate model evaluation
atmosfärvetenskap och oceanografi
Atmospheric Sciences and Oceanography

Biuppslag (personer, institutioner, konferenser, titlar ...)

Svensson, Gunilla,ProfessorStockholms universitet,Meteorologiska institutionen (MISU) (preses)
Graversen, Rune G.,DocentStockholms universitet,Meteorologiska institutionen (MISU) (preses)
Dierking, Wolfgang,DrThe Alfred Wegener Institute, Bremerhaven, Germany (opponent)
Stockholms universitetMeteorologiska institutionen (MISU) (creator_code:org_t)

Internetlänk

Hitta via bibliotek

On the Arctic Seasonal Cycle (Sök publikationen i LIBRIS)

Till lärosätets databas

1 av 1
Föregående post
Nästa post
Till träfflistan

Hitta mer i SwePub

Av författaren/redakt...: Mortin, Jonas, 1 ...; Svensson, Gunill ...; Graversen, Rune ...; Dierking, Wolfga ...

Om ämnet

NATURVETENSKAP: NATURVETENSKAP; och Geovetenskap och ...; och Klimatforskning

Av lärosätet: Stockholms universitet

Sök utanför SwePub

Sök vidare i:: Google; Google Book Search; Google Scholar

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

LIBRIS.kb.se