{"id":6129,"date":"2026-10-19T09:48:30","date_gmt":"2026-10-19T09:48:30","guid":{"rendered":"https:\/\/phd.hi.is\/doktorsvorn\/doktorsvorn-i-jardfraedi-rebecca-anna-neely\/"},"modified":"2026-10-19T09:48:30","modified_gmt":"2026-10-19T09:48:30","slug":"doktorsvorn-i-jardfraedi-rebecca-anna-neely","status":"publish","type":"phd_defence","link":"https:\/\/phd.hi.is\/en\/doktorsvorn\/doktorsvorn-i-jardfraedi-rebecca-anna-neely\/","title":{"rendered":"Doktorsv\u00f6rn \u00ed jar\u00f0fr\u00e6\u00f0i \u2013 Rebecca Anna Neely"},"content":{"rendered":"<div class=\"field-items\">\n<div class=\"field-item even\" property=\"content:encoded\">\n<p>Mi\u00f0vikudaginn 9. \u00e1g\u00fast ver Rebecca Anna Neely doktorsritger\u00f0 s\u00edna \u00ed jar\u00f0fr\u00e6\u00f0i vi\u00f0 Jar\u00f0v\u00edsindadeild H\u00e1sk\u00f3la \u00cdslands. Ritger\u00f0in ber heiti\u00f0:\u00a0M\u00f3l\u00fdbden sams\u00e6tur \u00ed vatnakerfum (<em>e.<\/em><em>\u00a0<\/em>Molybdenum isotope behaviour in aqueous systems).<\/p>\n<p>Andm\u00e6lendur eru dr. Thomas F. N\u00e4gler, d\u00f3sent \u00ed sams\u00e6tujar\u00f0fr\u00e6\u00f0i vi\u00f0 jar\u00f0fr\u00e6\u00f0ideild h\u00e1sk\u00f3lans \u00ed Bern \u00ed Sviss og dr. Caroline L. Peacock, d\u00f3sent \u00ed l\u00edfjar\u00f0efnafr\u00e6\u00f0i vi\u00f0 jar\u00f0- og umhverfisv\u00edsindadeild H\u00e1sk\u00f3lans \u00ed Leeds \u00ed Bretlandi.<\/p>\n<p>Lei\u00f0beinandi er dr. Sigur\u00f0ur Reynir G\u00edslason, v\u00edsindama\u00f0ur vi\u00f0 Jar\u00f0v\u00edsindastofnun H\u00e1sk\u00f3la \u00cdslands. A\u00f0rir \u00ed doktorsnefnd eru dr. Kevin Burton, pr\u00f3fessor vi\u00f0 Durhamh\u00e1sk\u00f3la \u00ed Bretlandi og vi\u00f0 Paul Sabatier h\u00e1sk\u00f3la \u00ed Toulouse \u00ed Frakklandi, og dr. Eric H. Oelkers, pr\u00f3fessor vi\u00f0 University College \u00ed London, ranns\u00f3knarstj\u00f3ri vi\u00f0 CNRS stofnunina vi\u00f0 Paul Sabatier h\u00e1sk\u00f3la \u00ed Toulouse \u00ed Frakklandi og gestapr\u00f3fessor vi\u00f0 Jar\u00f0v\u00edsindadeild H\u00e1sk\u00f3la \u00cdslands.<\/p>\n<p>Magn\u00fas Tumi Gu\u00f0mundsson, forseti Jar\u00f0v\u00edsindadeildar H\u00cd st\u00fdrir v\u00f6rninni sem fer fram \u00ed H\u00e1t\u00ed\u00f0arsal H\u00e1sk\u00f3la \u00cdslands, a\u00f0albyggingu og hefst klukkan 15:00.<\/p>\n<p><strong>\u00c1grip af ranns\u00f3kn<\/strong><\/p>\n<p>M\u00f3l\u00fdbden (Mo) sams\u00e6tur eru oft nota\u00f0ar til a\u00f0 meta oxunarstig vi\u00f0 yfirbor\u00f0 jar\u00f0ar \u00e1 \u00fdmsum skei\u00f0um jar\u00f0s\u00f6gunnar. A\u00f0fer\u00f0in, sem beitt er, byggist \u00e1 einf\u00f6ldu sj\u00e1varl\u00edkani, \u00fear sem styrkur og sams\u00e6tur Mo \u00ed sj\u00f3 stj\u00f3rnast fyrst og fremst af \u00e1rvatni, en jar\u00f0hiti \u00e1 \u00fathafshryggjum hefur til \u00feessa veri\u00f0 talinn hafa l\u00edtil \u00e1hrif. \u00deessi ranns\u00f3kn s\u00fdnir a\u00f0 kalt grunnvatn (\u03b498MoGROUNDWATER 0,1\u2030) er me\u00f0 svipa\u00f0a sams\u00e6tusamsetningu og berggrunnurinn sem \u00fea\u00f0 fl\u00e6\u00f0ir um (\u03b498MoBASALT 0,15\u2030), en jar\u00f0hitavatn inniheldur \u00feyngri sams\u00e6tur (\u03b498MoHYDROTHERMAL +0,2\u2030 til +1,8\u2030). \u00deessi g\u00f6gn voru notu\u00f0, \u00e1samt \u00e1\u00f0ur birtu mati \u00e1 efnaflutningum til sj\u00e1var, til a\u00f0 endurreikna Mo-sams\u00e6tuhlutf\u00f6ll innfl\u00e6\u00f0is til sj\u00e1var vi\u00f0 n\u00faverandi a\u00f0st\u00e6\u00f0ur, fr\u00e1 +0,5\u2030 (\u00e1rvatn) \u00ed +0,35\u2030 (blanda \u00e1rvatns og jar\u00f0hitavatns).<\/p>\n<p>M\u00f3l\u00fdbden er nau\u00f0synlegt l\u00edfverum og hefur \u00fev\u00ed \u00e1hrif \u00e1 n\u00e6ringarefnahringr\u00e1sina, s\u00e9r \u00ed lagi sem \u00fe\u00e1ttur \u00ed n\u00edtr\u00f3genasa sem er algengasta niturbindandi ens\u00edmi\u00f0. A\u00f0greining Mo sams\u00e6ta vegna lj\u00f3still\u00edfunar bl\u00e1\u00fe\u00f6runga (\u201ecyanobacteria\u201d) \u00ed M\u00fdvatni m\u00e6ldist vera 1,5\u2030. \u00deetta er \u00ed fyrsta sinn sem \u00feessi a\u00f0greining er m\u00e6ld \u00ed vatnaumhverfi \u00fear sem l\u00e9tta sams\u00e6tan binst \u00ed \u00fe\u00f6rungunum og \u00feunga sams\u00e6tan ver\u00f0ur eftir \u00ed vatninu. Nau\u00f0synlegt er a\u00f0 hafa l\u00edffr\u00e6\u00f0ileg ferli \u00ed huga vi\u00f0 t\u00falkun og greiningu setlaga, \u00fev\u00ed \u00feessi sams\u00e6tua\u00f0greining kann a\u00f0 var\u00f0veitast \u00ed l\u00f6gunum.<\/p>\n<p>\u00cd jar\u00f0hitakerfum myndast gufufasi vegna afg\u00f6sunar kviku og su\u00f0u jar\u00f0hitav\u00f6kva. \u00der\u00e1tt fyrir v\u00edsbendingar um a\u00f0 gufufasinn geti safna\u00f0 \u00ed sig m\u00e1lmum og flutt \u00fe\u00e1, er l\u00edti\u00f0 vita\u00f0 um \u00e1hrif \u00feessa flutnings \u00e1 st\u00f6\u00f0ugar sams\u00e6tur m\u00e1lmanna. Til d\u00e6mis eru Mo sams\u00e6tur \u00ed m\u00e1lmgr\u00fdti mj\u00f6g breytilegar, en ors\u00f6kina m\u00e1 a\u00f0 einhverju leyti rekja til \u00feessa flutnings. Sams\u00e6tuhlutf\u00f6ll m\u00f3l\u00fdbdens \u00ed vatns- og gufufasa fj\u00f6gurra \u00edslenskra jar\u00f0hitakerfa voru ranns\u00f6ku\u00f0 \u00ed \u00feessu verkefni. Sams\u00e6tur gufufasans (V) reyndust \u00e1vallt l\u00e9ttari en jar\u00f0hitav\u00f6kvans (L), og er au\u00f0gunin (\u03b5V-L) -2,9\u2030. \u00deetta er mikilv\u00e6gt fyrsta skref \u00ed \u00e1tt a\u00f0 skilningi \u00e1 ferlum \u00feeim sem stj\u00f3rna gufuflutningum og t\u00falkun \u00e1 \u00e1hrifum flutninganna \u00e1 sams\u00e6tur.<\/p>\n<p><strong>Um doktorsefni\u00f0<\/strong><\/p>\n<p><strong><img fetchpriority=\"high\" decoding=\"async\" alt=\"\" height=\"348\" width=\"521\" class=\"b-lazy\" data-src=\"https:\/\/ugla.hi.is\/pub\/ufiles\/f5\/f5b2661e3d\/Rebecca%20Anna%20Neely.JPG\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\"><\/strong><\/p>\n<p>Rebecca lauk meistarapr\u00f3fi \u00ed jar\u00f0v\u00edsindum fr\u00e1 Oxfordh\u00e1sk\u00f3la \u00ed Bretlandi \u00e1ri\u00f0 2011. H\u00fan vann s\u00ed\u00f0an sem a\u00f0sto\u00f0arma\u00f0ur vi\u00f0 jar\u00f0efnafr\u00e6\u00f0i- og eldfjallafr\u00e6\u00f0iranns\u00f3knir \u00ed felti og \u00e1 ranns\u00f3knarstofu vi\u00f0 Oxfordh\u00e1sk\u00f3la \u00fear til h\u00fan h\u00f3f doktorsn\u00e1m sitt vi\u00f0 H\u00e1sk\u00f3la \u00cdslands \u00ed \u00e1g\u00fast 2012. St\u00f3r hluti doktorsranns\u00f3knarinnar var unninn \u00ed samvinnu vi\u00f0 Durhamh\u00e1sk\u00f3la \u00fear sem Rebecca dvaldi \u00ed meira en tv\u00f6 \u00e1r sem gestanemi.<\/p>\n<\/div><\/div>","protected":false},"featured_media":1971,"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":"2017-08-09T15:00:00+00:00","_phd_date_end":"2017-08-09T18:00:00+00:00","_phd_location":"H\u00e1t\u00ed\u00f0arsalur - A\u00f0albygging","_phd_admission":"Doktorsv\u00f6rn fer fram \u00e1 ensku, allir velkomnir","_phd_thesis_title":"M\u00f3l\u00fdbden sams\u00e6tur \u00ed vatnakerfum (e. 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