{"id":46335,"date":"2024-06-24T06:01:10","date_gmt":"2024-06-24T04:01:10","guid":{"rendered":"https:\/\/novanews.co.za\/weslander\/studie-wys-sink-tel-20240619-2\/"},"modified":"2025-03-21T17:06:14","modified_gmt":"2025-03-21T15:06:14","slug":"studie-wys-sink-tel-20240619-2","status":"publish","type":"post","link":"https:\/\/novanews.co.za\/weslander\/studie-wys-sink-tel-20240619-2\/","title":{"rendered":"Studie wys sink tel"},"content":{"rendered":"\n

Die belangrike rol wat die Suidelike Yssee in globale biologiese prosesse en die koolstofkringloop speel, is opnuut bevestig deur \u2019n studie wat vandeesweek gepubliseer is. Hierdie studie, wat in die internasionale joernaal Science<\/span><\/i> verskyn het en die eerste keer gegrond is op bewyse wat uit die ingesamelde seewatermonsters verkry is, het die ondergewaardeerde rol van anorganiese sinkpartikels in hierdie siklusse aan die lig gebring.<\/p>\n\n\n\n

Die Suidelike Yssee speel die grootste rol in fitoplanktonproduktiwiteit, verantwoordelik vir die opname van atmosferiese koolstofdioksied. In hierdie prosesse is sink, wat in spoorhoeveelhede in seewater voorkom, \u2019n noodsaaklike mikrovoedingstof wat van kardinale belang is vir baie biochemiese prosesse in see-organismes en veral vir die groei van fitoplankton by die pole. Wanneer fitoplankton vergaan, word die sink weer vrygestel.<\/p>\n\n\n\n

Navorsers het egter tot op hede kopgekrap omdat sink en fosfor (\u2019n ander mikrovoedingstof wat ook noodsaaklik is vir lewe in die oseane) klaarblyklik nie \u2019n onderlinge verband toon nie \u2013 d\u00edt, ten spyte daarvan dat albei spoorelemente saam in fitoplankton voorkom. In plaas daarvan word \u2019n sterk (maar onverklaarbare) verwantskap tussen sink en opgeloste silika dikwels gesien. <\/p>\n\n\n\n

Prof. Alakendra Roychoudhury, \u2019n spesialis in omgewings- en mariene biogeochemie aan die Universiteit Stellenbosch (US) en \u2019n mede-outeur van die artikel, s\u00ea hulle kan nou vir die eerste keer met sekerheid die biogeochemiese prosesse wat die oseane se sinkkringloop dryf, verduidelik.<\/p>\n\n\n\n

Roychoudhury se navorsingsgroep was sedert 2013 in die US se departement Aardwetenskappe by drie ekspedisies van Suid-Afrika se poolnavorsings\u00advaartuig, die SA Agulhas II, betrokke. Gedurende die ekspedisies na Antarktika in die somer, sowel as die winter, het hulle die uitgestrekte Suidelike Yssee oorgesteek en kon die span navorsers monsters van die oppervlakwater, die diepsee \u00e9n sedimente versamel.<\/p>\n\n\n\n

Dr. Ryan Cloete, mede- eerste outeur en tans \u2019n nadoktorale genoot by die Laboratorium vir Omgewingsmariene Wetenskappe (LEMAR) in Frankryk, het aan twee van hierdie ekspedisies deelgeneem. <\/p>\n\n\n\n

\u201cDie bestudering van die Suidelike Yssee is uiters belangrik aangesien dit as \u2019n sentrale spilpunt vir globale seesirkulasie optree. Prosesse wat in die Suidelike Yssee voorkom, word aan watermassas oorgedra, wat dan na die Atlantiese, Indiese en Stille Oseaan vervoer word,\u201d verduidelik hy.<\/p>\n\n\n\n

In samewerking met navorsers van Princeton Universiteit, die Universiteite van Chicago en Kaliforni\u00eb Santa Cruz, sowel as die Max Planck-instituut vir Chemie, is die monsters (met behulp van X-straal-spektroskopiese tegnieke by \u2019n sinchrotron-fasiliteit) aan volledige partikel-vir-partikel-ontleding onderwerp, wat hulle in staat gestel het om die monsters op atoom- en molekul\u00eare vlak te bestudeer.<\/p>\n\n\n\n

\n Die ontrafeling van die drywers van die globale sinkkringloop in ons oseane:<\/b>\n<\/p>\n\n\n\n

Dit blyk dat ho\u00ebr produktiwiteit gedurende die somermaande lei tot \u2019n oorvloed sink in die boonste organiese laag van die oseaan, wat dan geredelik beskikbaar is vir opname deur fitoplankton. Die navorsers het egter in dieselfde monsters ook ho\u00eb konsentrasies sink gevind, wat verband hou met puin van rots- en atmosferiese stofdeeltjies.<\/p>\n\n\n\n

In die oop see is die wisselwerking tussen die assosiasie of dissosiasie van sinkpartikels deurslaggewend vir die aanvulling van opgeloste sink om seelewe te ondersteun.<\/p>\n\n\n\n

Cloete verduidelik hul bevindings: \u201cAs gevolg van swak groeitoestande in die winter word sinkdeeltjies letterlik \u2018gevang\u2019 deur anorganiese vastestowwe soos silika, wat volop beskikbaar is in die vorm van diatome, asook yster- en aluminiumoksied. Diatome is mikroalge \u2013 eensellige organismes met \u2019n skelet wat uit silika bestaan \u2013 wat dus die sterk onderlinge verband tussen sink en silika in die oseane verklaar.\u201d<\/p>\n\n\n\n

Met ander woorde, wanneer sink met \u2019n organiese ligand bind, kan dit maklik deur see-organismes soos fitoplankton opgeneem word. Sink in \u2019n mineraalfase los egter nie maklik op nie en sal dus nie geredelik vir opname beskikbaar wees nie. In hierdie vorm kan sinkpartikels groot massas vorm wat na die diepsee sink waar fitoplankton dit nie vir opname kan bekom nie.<\/p>\n\n\n\n

\n Implikasies vir \u2019n veranderende klimaat<\/b>\n<\/p>\n\n\n\n

Hierdie begrip van die globale sinkkringloop het belangrike implikasies in die konteks van die verwarming van oseane, waarsku Roychoudhury: \u201c \u2019n Warmer klimaat verhoog erosie, wat lei tot meer stof in die atmosfeer en gevolglik meer stof wat in die oseane beland. <\/p>\n\n\n\n

\u201cMeer stof beteken meer sinkdeeltjies word vasgevang, wat weer daartoe lei dat minder sink beskikbaar is om fitoplankton en ander seelewe te onderhou.\u201d<\/p>\n\n\n\n

Cloete s\u00ea hul nuwe benadering tot die bestudering van die see se sinkkringloop maak nou die deur oop om ander belangrike spoorelemente te ondersoek: <\/p>\n\n\n\n

\u201cNet soos sink, kan in die toekoms veranderinge rakende die verspreiding van koper, kadmium en kobalt voorkom wat deur die veranderende klimaat gedryf word.\u201d<\/p>\n\n\n\n

Volgens Roychoudhury herbevestig hierdie bevindings die Suidelike Yssee se globale invloed op die regulering van die klimaat en die mariene voedselweb: <\/p>\n\n\n\n

\u201cDie aardestelsel is ingewikkeld onderling verbind deur fisiese, chemiese en biologiese prosesse met selfkorrigerende terugvoerlusse om veranderlikheid te moduleer en klimaatsverandering teen te werk. Ons bevindings is \u2019n uitstekende voorbeeld van hierdie interaksie waar biochemiese prosesse wat op molekul\u00eare vlak plaasvind, globale prosesse soos die verwarming van ons planeet kan be\u00efnvloed.\u201d<\/p>\n","protected":false},"excerpt":{"rendered":"

Die belangrike rol wat die Suidelike Yssee in globale biologiese prosesse en die koolstofkringloop speel, is opnuut bevestig deur \u2019n studie wat vandeesweek gepubliseer is. Hierdie studie, wat in die internasionale joernaal Science verskyn het en 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