{"id":6466,"date":"2026-10-19T09:48:56","date_gmt":"2026-10-19T09:48:56","guid":{"rendered":"https:\/\/phd.hi.is\/doktorsvorn\/doktorsvorn-i-jardfraedi-ahmed-hamdi-abdrabou-moghazi\/"},"modified":"2026-10-19T09:48:56","modified_gmt":"2026-10-19T09:48:56","slug":"doktorsvorn-i-jardfraedi-ahmed-hamdi-abdrabou-moghazi","status":"publish","type":"phd_defence","link":"https:\/\/phd.hi.is\/en\/doktorsvorn\/doktorsvorn-i-jardfraedi-ahmed-hamdi-abdrabou-moghazi\/","title":{"rendered":"Doktorsv\u00f6rn \u00ed jar\u00f0fr\u00e6\u00f0i – Ahmed Hamdi Abdrabou Moghazi"},"content":{"rendered":"
\n
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Streymi \u00e1 Zoom<\/a><\/p>\n

Heiti ritger\u00f0ar:
<\/strong>Umhverfi og loftslag Nihewan-dalsins \u00ed nor\u00f0austurhluta K\u00edna \u00e1 fyrri hluta pleist\u00f3sen<\/p>\n

Andm\u00e6lendur<\/strong>:
Dr. Jonathan Holmes, pr\u00f3fessor \u00ed e\u00f0lisfr\u00e6\u00f0ilegri landafr\u00e6\u00f0i, University College London, Bretlandi
Dr. Christopher J. Bae, pr\u00f3fessor \u00ed mannfr\u00e6\u00f0i, University of Hawai\u02bbi at M\u0101noa, Bandar\u00edkjunum<\/p>\n

Lei\u00f0beinandi:
<\/strong>Dr. Steffen Mischke, pr\u00f3fessor vi\u00f0 Jar\u00f0v\u00edsindadeild H\u00e1sk\u00f3la \u00cdslands<\/p>\n

Einnig \u00ed doktorsnefnd:
<\/strong>Dr. \u00cdvar \u00d6rn Benediktsson, ranns\u00f3knarpr\u00f3fessor vi\u00f0 Jar\u00f0v\u00edsindastofnun H\u00e1sk\u00f3la \u00cdslands
Dr. \u00deorsteinn \u00deorsteinsson, Ve\u00f0urstofu \u00cdslands<\/p>\n

Doktorsv\u00f6rn st\u00fdrir:
<\/strong>Dr. Andri Stef\u00e1nsson, pr\u00f3fessor og deildarforseti Jar\u00f0v\u00edsindadeildar H\u00cd<\/p>\n

\u00c1grip:
<\/strong>Nihewan-sigd\u00e6ldin \u00ed nor\u00f0urhluta K\u00edna var\u00f0veitir fj\u00f6lda fornminja fr\u00e1 fyrri hluta pleist\u00f3sen \u00e1 fornstein\u00f6ld og er einn elsti fundarsta\u00f0ur frummanna utan Afr\u00edku. \u00cd \u00feessari doktorsranns\u00f3kn er ger\u00f0 greining \u00e1 setl\u00f6gum \u00far \u00feremur skur\u00f0um \u00e1 Dachangliang hryggnum \u00ed nor\u00f0austurhluta Nihewan-sigd\u00e6ldarinnar. Markmi\u00f0 ranns\u00f3knarinnar er a\u00f0 endurskapa umhverfis- og loftslagsbreytingar og meta tengsl \u00feeirra vi\u00f0 athafnir frummanna \u00e1 fyrri hluta pleist\u00f3sent\u00edmabilsins. Fj\u00f6l\u00fe\u00e1ttan\u00e1lgun er beitt, \u00fear sem vettvangsathuganir eru tengdar vi\u00f0 greiningar \u00e1 kornast\u00e6r\u00f0, segulvi\u00f0n\u00e1mi og samsetningu tv\u00edskelja skelkrabba (ostracod). A\u00f0 auki er notast vi\u00f0 breytubundin kornast\u00e6r\u00f0ardreifingarl\u00edk\u00f6n (end-member modeling), greiningar \u00e1 hringferlum jar\u00f0lagaskipanar (cyclostratigraphy) og greiningu \u00e1 st\u00f6\u00f0ugum sams\u00e6tum \u00ed skeljum skelkrabba (\u03b4\u00b9\u2078O og \u03b4\u00b9\u00b3C gildi). Setl\u00f6gin sem ranns\u00f6ku\u00f0 voru eru a\u00f0 mestu t\u00falku\u00f0 sem \u00e1rset sem var upphaflega vindbori\u00f0. \u00dea\u00f0 safna\u00f0ist upp \u00ed sex setmyndunarhrinum, annars vegar \u00ed votlendi me\u00f0 t\u00edmabundnum st\u00f6\u00f0uvatnamyndunum, og hins vegar \u00e1 \u00e1rsl\u00e9ttum. Kornast\u00e6r\u00f0ardreifingu samsetta sni\u00f0sins NH-T m\u00e1 rekja til fj\u00f6gurra \u00f3l\u00edkra \u00fe\u00e1tta (EM1-4). EM1-3 voru nota\u00f0ir til a\u00f0 draga \u00e1lyktanir um s\u00f6gu mons\u00fanrigninga um sumur og vetur (EASM\/EAWM) \u00ed austurhluta As\u00edu. Skilyr\u00f0i til sumarrigninga voru r\u00edkjandi fyrir um 1,66-1,62, 1,52-1,25 og fr\u00e1 0,82 millj\u00f3num \u00e1ra. Aftur \u00e1 m\u00f3ti voru skilyr\u00f0i til vetrarrigninga r\u00edkjandi fr\u00e1 u.\u00fe.b. 1,62-1,52 millj\u00f3num \u00e1ra og \u00e1 t\u00edmabili mikilla umbreytinga \u00e1 mi\u00f0-pleist\u00f3sen fyrir um 1,25-0,82 millj\u00f3num \u00e1ra. \u00d3venju sterk samfylgni \u03b4\u00b9\u2078O\u2013\u03b4\u00b9\u00b3C bendir til \u00feess a\u00f0 vatnasv\u00e6\u00f0i\u00f0 hafi a\u00f0 mestu veri\u00f0 afloka\u00f0 og or\u00f0i\u00f0 fyrir \u00e1hrifum uppgufunar. Greina m\u00e1tti breytingar \u00e1 vatnafari milli st\u00f6\u00f0uvatns\u00e1stands og rennandi vatns. Samhli\u00f0a fornleifag\u00f6gnum vir\u00f0ist sem frummenn hafi veri\u00f0 \u00e1 vatnasv\u00e6\u00f0inu \u00e1 t\u00edmabilum \u00fear sem loftslag me\u00f0 sumarrigningum (EASM) og myndun st\u00f6\u00f0uvatna var r\u00edkjandi. Samanlagt skerpa \u00feessar ni\u00f0urst\u00f6\u00f0ur skilning okkar \u00e1 \u00feeim hagst\u00e6\u00f0u og \u00f3hagst\u00e6\u00f0u loftslagsskilyr\u00f0um sem m\u00f3tu\u00f0u athafnir frummanna \u00e1 fyrri hluta pleist\u00f3sent\u00edmabilsins \u00e1 \u00feessu sv\u00e6\u00f0i. \u00deannig leggja \u00feessar ranns\u00f3knir mikilv\u00e6gan grunn a\u00f0 frekari ranns\u00f3knum \u00e1 fornloftslagi og umhverfisa\u00f0st\u00e6\u00f0um frummanna \u00ed Austur-As\u00edu \u00e1 fyrri hluta pleist\u00f3sen.<\/p>\n

Um doktorsefni\u00f0:
<\/strong>Ahmed f\u00e6ddist \u00e1ri\u00f0 1992 \u00ed Aswan \u00ed Egyptalandi. Hann lauk bachelor-pr\u00f3fi \u00ed jar\u00f0fr\u00e6\u00f0i \u00e1ri\u00f0 2013 fr\u00e1 Aswan-h\u00e1sk\u00f3la \u00ed Egyptalandi og meistarapr\u00f3fi \u00ed ol\u00edujar\u00f0verkfr\u00e6\u00f0i \u00e1ri\u00f0 2019 fr\u00e1 H\u00e1sk\u00f3lanum \u00ed Miskolc \u00ed Ungverjalandi. \u00c1 \u00e1runum 2014\u20132017 og aftur 2019\u20132021 starfa\u00f0i hann sem kennslu- og ranns\u00f3knara\u00f0sto\u00f0arma\u00f0ur vi\u00f0 jar\u00f0fr\u00e6\u00f0ideild Aswan-h\u00e1sk\u00f3la. Sumrin 2018 og 2019 t\u00f3k hann \u00fe\u00e1tt \u00ed ranns\u00f3knarstarfsn\u00e1mi vi\u00f0 GFZ Helmholtz-mi\u00f0st\u00f6\u00f0 jar\u00f0v\u00edsinda \u00ed Potsdam \u00ed \u00de\u00fdskalandi. \u00cd febr\u00faar 2021 h\u00f3f hann doktorsn\u00e1m \u00ed jar\u00f0fr\u00e6\u00f0i eftir a\u00f0 hafa hloti\u00f0 bo\u00f0 um doktorsst\u00f6\u00f0u fr\u00e1 pr\u00f3fessor Steffen Mischke. Samhli\u00f0a doktorsn\u00e1mi s\u00ednu hefur Ahmed starfa\u00f0 \u00ed hlutastarfi vi\u00f0 kennslu vi\u00f0 H\u00e1sk\u00f3la \u00cdslands.<\/p>\n

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