{"id":6319,"date":"2026-10-19T09:48:46","date_gmt":"2026-10-19T09:48:46","guid":{"rendered":"https:\/\/phd.hi.is\/doktorsvorn\/doktorsvorn-i-umhverfisverkfraedi-darri-eythorsson\/"},"modified":"2026-10-19T09:48:46","modified_gmt":"2026-10-19T09:48:46","slug":"doktorsvorn-i-umhverfisverkfraedi-darri-eythorsson","status":"publish","type":"phd_defence","link":"https:\/\/phd.hi.is\/en\/doktorsvorn\/doktorsvorn-i-umhverfisverkfraedi-darri-eythorsson\/","title":{"rendered":"Doktorsv\u00f6rn \u00ed umhverfisverkfr\u00e6\u00f0i – Darri Ey\u00fe\u00f3rsson"},"content":{"rendered":"
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Streymi<\/strong><\/a><\/p>\n

Doktorsefni:<\/strong>\u00a0Darri Ey\u00fe\u00f3rsson<\/p>\n

Heiti ritger\u00f0ar:\u00a0<\/strong>\u00der\u00f3un hnattr\u00e6nna snj\u00f3alaga \u00ed fort\u00ed\u00f0 og framt\u00ed\u00f0 – m\u00e6lt me\u00f0 fjark\u00f6nnun og sp\u00e1\u00f0 me\u00f0 dreif\u00f0um reiknil\u00edk\u00f6num\u00a0<\/strong>(Historical and future trends in global snow conditions \u2013 observed by remote sensing and forecasted by spatio-temporal modelling)<\/p>\n

Andm\u00e6lendur:\u00a0
<\/strong>Dr. Halld\u00f3r Bj\u00f6rnsson,\u00a0h\u00f3pstj\u00f3ri ve\u00f0urs og loftslags hj\u00e1 Ve\u00f0urstofu \u00cdslands
Dr. Konstantinos Andreadis, lektor vi\u00f0 University of Massachusetts, Bandar\u00edkjunum<\/p>\n

Lei\u00f0beinandi:<\/strong>\u00a0Dr. Sigur\u00f0ur Magn\u00fas Gar\u00f0arsson, pr\u00f3fessor vi\u00f0 Umhverfis- og byggingarverkfr\u00e6\u00f0ideild H\u00cd og forseti Verkfr\u00e6\u00f0i- og n\u00e1tt\u00faruv\u00edsindasvi\u00f0s H\u00cd<\/p>\n

Einnig \u00ed doktorsnefnd:
<\/strong>Dr. Bart Nijssen, pr\u00f3fessor og deildarforseti Umhverfis- og byggingarverkfr\u00e6\u00f0ideildar, University of Washington
Dr. \u00d3li Gr\u00e9tar Bl\u00f6ndal Sveinsson, forst\u00f6\u00f0uma\u00f0ur \u00fer\u00f3unar og vatnsafls hj\u00e1 Landsvirkjun
Dr. Birgir Hrafnkelsson, pr\u00f3fessor vi\u00f0 Raunv\u00edsindadeild H\u00e1sk\u00f3la \u00cdslands
<\/strong><\/p>\n

Doktorsv\u00f6rn st\u00fdrir:<\/strong>\u00a0Dr. Gu\u00f0mundur Freyr \u00dalfarsson, deildarforseti Umhverfis- og byggingarverkfr\u00e6\u00f0ideildar H\u00cd.<\/p>\n

\u00c1grip<\/strong><\/p>\n

Snj\u00f3au\u00f0lindir v\u00ed\u00f0svegar um heiminn eru n\u00fa breytingum undiropnar \u00ed kj\u00f6lfar hnattr\u00e6nna loftlagsbreytinga. \u00deessar au\u00f0lindir eru mikilv\u00e6gar v\u00ed\u00f0svegar og breytingar \u00e1 e\u00f0li \u00feeirra hafa haft og munu halda \u00e1fram a\u00f0 hafa \u00e1hrif \u00e1 mannleg samf\u00e9l\u00f6g og vistkerfi \u00e1 kv\u00f6ldum sv\u00e6\u00f0um. Ranns\u00f3kn s\u00fa er birt er \u00ed \u00feessari ritger\u00f0 fjallar um greiningu og samanbur\u00f0 \u00e1 s\u00f6gulegri \u00fer\u00f3un loftlags og snj\u00f3s og ger\u00f0 forsp\u00e1r um \u00fea\u00f0 hvernig v\u00e6ntar loftlagsbreytingar munu hafa \u00e1hrif \u00e1 snj\u00f3au\u00f0lindir \u00fat 21 \u00f6ldina mi\u00f0a\u00f0 vi\u00f0 mismunandi svi\u00f0smyndir \u00ed hl\u00fdnun. Ni\u00f0urst\u00f6\u00f0ur ranns\u00f3knarinnar s\u00fdna fram \u00e1 a\u00f0 v\u00ed\u00f0t\u00e6kar breytingar hafa \u00feegar or\u00f0i\u00f0 \u00e1 snj\u00f3\u00feekju \u00e1 Nor\u00f0ur Hveli jar\u00f0ar (NH) fr\u00e1 byrjun 21 aldarinnar \u00fatfr\u00e1 fjark\u00f6nnunarg\u00f6gnum fr\u00e1 MODIS gervihnattam\u00e6linum. Sp\u00e1\u00f0 var fyrir um framt\u00ed\u00f0ar\u00fer\u00f3un snj\u00f3au\u00f0linda \u00e1 NH fyrir t\u00edmabili\u00f0 1950-2100 me\u00f0 Snow17 snj\u00f3l\u00edkaninu \u00fatfr\u00e1 21 CMIP5 loflagsl\u00edk\u00f6num fyrir tv\u00f6 hl\u00fdnunartilvik (RCP45 og RCP85). Ni\u00f0urst\u00f6\u00f0ur l\u00edkansins gefa til kynna a\u00f0 t\u00ed\u00f0ni snj\u00f3hulu (SCF) muni almennt minnka verulega um allt NH en a\u00f0 hinsvegar, muni me\u00f0al r\u00fam\u00e1l vatns sem geymt er \u00ed snj\u00f3al\u00f6gum NH aukast l\u00edtillega \u00ed byrjun t\u00edmabilsins, a\u00f0allega vegna aukinnar snj\u00f3komu og nor\u00f0l\u00e6gum breiddargr\u00e1\u00f0um innan nor\u00f0urheimskautsbaugs, en minnka svo aftur a\u00f0 \u00fev\u00ed sem var um 1950 fyrir RCP45 en 10% ne\u00f0ar en svo fyrir RCP85. \u00der\u00f3un \u00ed loftlagi og snj\u00f3au\u00f0lindum var ranns\u00f6ku\u00f0 s\u00e9rstaklega \u00e1 \u00cdslandi, sem leiddi \u00ed lj\u00f3s t\u00f6lfr\u00e6\u00f0ilega markt\u00e6kta aukningu \u00e1 snj\u00f3hulu st\u00f3rum sv\u00e6\u00f0um fr\u00e1 aldam\u00f3tum, sp\u00e1 um \u00fer\u00f3un snj\u00f3au\u00f0linda \u00fat 21 \u00f6ldina gerir hinsvegar r\u00e1\u00f0 fyrir verulegri minnkun snj\u00f3hulu \u00ed \u00f6llum h\u00e6\u00f0arbilum \u00e1 \u00cdslandi.<\/p>\n

Um doktorsefni\u00f0<\/strong><\/p>\n

Darri Ey\u00fe\u00f3rsson lauk BS n\u00e1mi \u00ed efnaverkfr\u00e6\u00f0i fr\u00e1 H\u00cd \u00e1ri\u00f0\u00a0 2011 og\u00a0MS n\u00e1mi \u00ed umverfisverkfr\u00e6\u00f0i fr\u00e1 sama sk\u00f3la \u00e1ri\u00f0 2015.<\/p>\n

Hann starfa\u00f0i vi\u00f0 n\u00fdsk\u00f6pun og ranns\u00f3knir hj\u00e1 Carbon Recycling International a\u00f0 loknu BS n\u00e1mi og samhli\u00f0a MS n\u00e1mi. Samhli\u00f0a doktorsn\u00e1mi hefur hann starfa\u00f0 hj\u00e1 Hagstofu \u00cdslands, Landsvirkjun, Hagfr\u00e6\u00f0istofnun H\u00cd, Verk\u00eds verkfr\u00e6\u00f0istofu og Loftlagsr\u00e1\u00f0i \u00cdslands. Einnig hefur hann sinnt kennslu vi\u00f0 Umhverfis- og byggingarverkfr\u00e6\u00f0ideild H\u00cd og n\u00e1msbraut \u00ed umhverfis- og au\u00f0lindafr\u00e6\u00f0i fr\u00e1 \u00e1rinu 2017. Hann hefur einnig kennt vi\u00f0 School of International Training fr\u00e1 \u00e1rinu 2022.<\/p>\n<\/div><\/div>","protected":false},"featured_media":5603,"template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"_phd_date_start":"2023-09-01T14:30:00+00:00","_phd_date_end":"2023-09-01T16:30:00+00:00","_phd_location":"Askja Stofa 132","_phd_admission":"A\u00f0gangur \u00f3keypis","_phd_thesis_title":"\u00der\u00f3un hnattr\u00e6nna snj\u00f3alaga \u00ed fort\u00ed\u00f0 og framt\u00ed\u00f0 - m\u00e6lt me\u00f0 fjark\u00f6nnun og sp\u00e1\u00f0 me\u00f0 dreif\u00f0um reiknil\u00edk\u00f6num (Historical and future trends in global snow conditions \u2013 observed by remote sensing and forecasted by spatio-temporal modelling)","_phd_source_url":"https:\/\/gamli.hi.is\/vidburdir\/doktorsvorn_i_umhverfisverkfraedi_darri_eythorsson","_phd_source_node_id":"422209","_phd_source_type":"vidburdir","_phd_member_id":855,"footnotes":""},"phd_school":[98,93],"phd_discipline":[130],"class_list":["post-6319","phd_defence","type-phd_defence","status-publish","has-post-thumbnail","hentry","phd_school-umhverfis-og-byggingarverkfraedideild","phd_school-verkfraedi-og-natturuvisindasvid","phd_discipline-phd-i-umhverfisverkfraedi"],"_links":{"self":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence\/6319","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence"}],"about":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/types\/phd_defence"}],"version-history":[{"count":0,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence\/6319\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/media\/5603"}],"wp:attachment":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/media?parent=6319"}],"wp:term":[{"taxonomy":"phd_school","embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_school?post=6319"},{"taxonomy":"phd_discipline","embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_discipline?post=6319"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}