{"id":6145,"date":"2026-10-19T09:48:33","date_gmt":"2026-10-19T09:48:33","guid":{"rendered":"https:\/\/phd.hi.is\/doktorsvorn\/doktorsvorn-i-liffraedi-teresa-sofia-giesta-da-silva\/"},"modified":"2026-10-19T09:48:33","modified_gmt":"2026-10-19T09:48:33","slug":"doktorsvorn-i-liffraedi-teresa-sofia-giesta-da-silva","status":"publish","type":"phd_defence","link":"https:\/\/phd.hi.is\/en\/doktorsvorn\/doktorsvorn-i-liffraedi-teresa-sofia-giesta-da-silva\/","title":{"rendered":"Doktorsv\u00f6rn \u00ed l\u00edffr\u00e6\u00f0i &#8211; Teresa Sofia Giesta da Silva"},"content":{"rendered":"<div class=\"field-items\">\n<div class=\"field-item even\" property=\"content:encoded\">\n<p><strong>Doktorsefni:<\/strong>\u00a0Teresa Sofia Giesta da Silva<\/p>\n<p><strong>Heiti ritger\u00f0ar:<\/strong>\u00a0Vistfr\u00e6\u00f0i lj\u00f3s\u00e1tu \u00e1 \u00cdslandsmi\u00f0um<\/p>\n<p><strong>Andm\u00e6lendur:<\/strong> <br \/> Dr. Bettina Meyer, pr\u00f3fessor vi\u00f0 Alfred Wegener stofnunina, Bremerhaven, \u00de\u00fdskalandi og Carl-von-Ossietzky h\u00e1sk\u00f3lann, Oldenburg, \u00de\u00fdskalandi.<br \/> Dr. Russell Ross Hopcroft, pr\u00f3fessor vi\u00f0 Alaska h\u00e1sk\u00f3la, Fairbanks, Bandar\u00edkjunum.\u00a0<\/p>\n<p><strong>Lei\u00f0beinandi:<\/strong>\u00a0Dr. \u00c1st\u00fe\u00f3r G\u00edslason, sj\u00e1varl\u00edffr\u00e6\u00f0ingur \u00e1 Hafranns\u00f3knastofnun, ranns\u00f3kna- og r\u00e1\u00f0gjafarstofnun hafs og vatna.<\/p>\n<p><strong>Einnig \u00ed doktorsnefnd:<\/strong> Dr. Gu\u00f0r\u00fan Marteinsd\u00f3ttir, pr\u00f3fessor L\u00edf- og umhverfisv\u00edsindadeild H\u00e1sk\u00f3la \u00cdslands.<br \/>Dr. \u00d3lafur S. \u00c1st\u00fe\u00f3rsson, sj\u00e1varl\u00edffr\u00e6\u00f0ingur \u00e1 Hafranns\u00f3knastofnun, ranns\u00f3kna- og r\u00e1\u00f0gjafarstofnun hafs og vatna.<strong><br \/> <\/strong><\/p>\n<p><strong>Doktorsv\u00f6rn st\u00fdrir:<\/strong>\u00a0Dr. Anna D\u00f3ra S\u00e6\u00fe\u00f3rsd\u00f3ttir, pr\u00f3fessor og deildarforseti L\u00edf- og umhverfisv\u00edsindadeildar H\u00e1sk\u00f3la \u00cdslands.<strong>\u00a0<\/strong><\/p>\n<p><strong>\u00c1grip<\/strong><\/p>\n<p>Lj\u00f3s\u00e1ta er mikilv\u00e6g \u00ed vistkerfi \u00cdslandsmi\u00f0a. Vegna \u00feess a\u00f0 st\u00f3r hluti af frumframlei\u00f0slu svif\u00fe\u00f6runga berst til efri f\u00e6\u00f0u\u00ferepa um lj\u00f3s\u00e1tu er l\u00edklegt a\u00f0 breytingar \u00ed stofnst\u00e6r\u00f0um lj\u00f3s\u00e1tustofna segi til s\u00edn \u00ed vexti og vi\u00f0gangi d\u00fdra sem eru ofar \u00ed f\u00e6\u00f0uke\u00f0junni. Ranns\u00f3knir \u00e1 vistfr\u00e6\u00f0i lj\u00f3s\u00e1tu eru \u00fev\u00ed mikilv\u00e6gar. Ranns\u00f3knin byggir \u00e1 \u00feremur ritr\u00fdndum greinum og einni sem liggur fyrir \u00ed handriti. Fyrsta greinin fjallar um \u00e1rst\u00ed\u00f0a- og langt\u00edmabreytingar lj\u00f3s\u00e1tu su\u00f0vestur, su\u00f0ur og su\u00f0austur af landinu \u00ed tengslum vi\u00f0 umhverfis\u00fe\u00e6tti og svifgr\u00f3\u00f0ur. G\u00f6gnin sem liggja til grundvallar eru b\u00e6\u00f0i \u00far gagnasafni Hafranns\u00f3knastofnunar og \u00far svonefndum \u00e1tuv\u00edsum (Continuous Plankton Recorders) sem Sir Alister Hardy hafranns\u00f3knastofnunin \u00ed Plymouth \u00e1 Englandi s\u00e9r um. Ni\u00f0urst\u00f6\u00f0urnar s\u00fdndu a\u00f0 \u00e1 \u00e1runum 1958 til 2007 minnku\u00f0u lj\u00f3s\u00e1tustofnar su\u00f0ur og su\u00f0vestur af landinu. \u00cd ritger\u00f0inni er l\u00edkum leitt a\u00f0 \u00fev\u00ed, a\u00f0 hl\u00fdnun sj\u00e1var \u00e1 umr\u00e6ddu t\u00edmabili hafi valdi\u00f0 \u00fev\u00ed \u00feess a\u00f0 vorv\u00f6xtur pl\u00f6ntusvifs var tilt\u00f6lulega seint \u00e1 fer\u00f0inni sem aftur kann a\u00f0 hafa valdi\u00f0 \u00fev\u00ed a\u00f0 \u00fea\u00f0 dr\u00f3 \u00far vexti lj\u00f3s\u00e1tu. Tv\u00e6r greinar l\u00fdsa \u00fatbrei\u00f0slu, magni og aldurssamsetningu lj\u00f3s\u00e1tu umhverfis \u00cdsland a\u00f0 vorlagi \u00ed tengslum vi\u00f0 umhverfis\u00fe\u00e6tti og vorv\u00f6xt pl\u00f6ntusvifs. Ni\u00f0urst\u00f6\u00f0urnar s\u00fdndu a\u00f0 magn lj\u00f3s\u00e1tu tengist b\u00e6\u00f0i \u00f3l\u00edfr\u00e6num \u00fe\u00e1ttum (a\u00f0allega hita, seltu og botnd\u00fdpi) og l\u00edfr\u00e6num (einkum magni og t\u00edmasetningu vorvaxtar svifgr\u00f3\u00f0urs). \u00datbrei\u00f0sla sj\u00f3ger\u00f0a vi\u00f0 landi\u00f0 hefur \u00feannig mikil \u00e1hrif \u00e1 v\u00f6xt og vi\u00f0gang lj\u00f3s\u00e1tu. Til d\u00e6mis voru lj\u00f3s\u00e1tuegg og -lirfur mun algengari \u00ed hl\u00fdsj\u00f3num su\u00f0ur og vestur af landinu en \u00ed kaldari sj\u00f3 fyrir nor\u00f0an og nor\u00f0austan \u00ed ma\u00ed 2013. Fullor\u00f0in d\u00fdr voru einnig algengust \u00ed hl\u00fdsj\u00f3num. \u00deannig var st\u00e6rsta lj\u00f3s\u00e1tutegundin, n\u00e1ttlampi (Meganyctiphanes norvegica), algengust \u00ed hl\u00fdsj\u00f3num fyrir sunnan og vestan. Augns\u00edli (Thysanoessa inermis) var hins vegar tilt\u00f6lulega algengt allt \u00ed kringum land, en einsog n\u00e1ttlampi fannst mest af \u00fev\u00ed \u00ed hl\u00fdsj\u00f3num fyrir sunnan og vestan. \u00cd fj\u00f3r\u00f0u greininni er ger\u00f0 grein fyrir ni\u00f0urst\u00f6\u00f0um ranns\u00f3kna \u00fear sem n\u00e1ttlampi var alinn vi\u00f0 mismunandi hitastig \u00ed tilraunast\u00f6\u00f0 Hafranns\u00f3knastofnunar a\u00f0 Sta\u00f0 vi\u00f0 Grindav\u00edk. Hitastig reyndist hafa mikil \u00e1hrif \u00e1 \u00fargangslosun og d\u00e1nart\u00f6lu d\u00fdranna. T\u00ed\u00f0ni skelskipta j\u00f3kst me\u00f0 auknu hitastigi.<\/p>\n<p><strong>Um doktorsefni\u00f0<\/strong><\/p>\n<p>Teresa Silva er f\u00e6dd \u00ed Porto \u00ed Port\u00fagal \u00e1ri\u00f0 1982. H\u00fan lauk BS-pr\u00f3fi \u00ed sj\u00e1varl\u00edffr\u00e6\u00f0i fr\u00e1 T\u00e6knih\u00e1sk\u00f3lanum \u00ed Leiria \u00ed Port\u00fagal \u00e1ri\u00f0 2005 og BSc Hons pr\u00f3fi \u00ed sj\u00e1varl\u00edffr\u00e6\u00f0i fr\u00e1 sama sk\u00f3la \u00e1ri\u00f0 2006. \u00c1rin 2008-2011 starfa\u00f0i Teresa \u00e1 Hafranns\u00f3knastofnun sem ranns\u00f3knama\u00f0ur \u00ed ranns\u00f3knum \u00e1 d\u00fdrasvifi.<\/p>\n<p>\u00c1ri\u00f0 2012 h\u00f3f h\u00fan doktorsn\u00e1m sitt vi\u00f0 H\u00e1sk\u00f3la \u00cdslands. \u00c1rin 2015-16 vann h\u00fan me\u00f0fram doktorsn\u00e1minu sem a\u00f0sto\u00f0arkennari vi\u00f0 H\u00e1sk\u00f3la \u00cdslands. \u00c1ri\u00f0 2018 hefur h\u00fan unni\u00f0 sem ranns\u00f3knama\u00f0ur \u00e1 Hafranns\u00f3knastofnun.<\/p>\n<p>Teresa b\u00fdr \u00ed Hafnarfir\u00f0i og \u00e1 eina d\u00f3ttur, Diana, f\u00e6dda \u00e1ri\u00f0 2014.<strong> <br \/> <\/strong><\/p>\n<p><a href=\"https:\/\/www.facebook.com\/events\/270944106890518\/\"><strong>Vi\u00f0bur\u00f0ur \u00e1 Facebook<\/strong><\/a><\/p>\n<\/div><\/div>","protected":false},"featured_media":2063,"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 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