極端氣候開始陸續浮現,人為及自然因素相信均有份參與。在這層面上,我們有沒有辦法可以得知以往的氣候變化又是如何呢?528Please respect copyright.PENANA7tnGBSXiKd
528Please respect copyright.PENANAvUzAoHRg0T
本篇將會探討一下測量地球海洋溫度轉變的其中一一道辦法。528Please respect copyright.PENANAcQtPUUWjhA528Please respect copyright.PENANAjuFyjcl3qF
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(圖2)二氧化碳是由一個碳原子(C)及兩個氧原子(O)而組成。528Please respect copyright.PENANAOVTZww7FYJ528Please respect copyright.PENANAz16sgsp72f
528Please respect copyright.PENANAh3zARBY3IJ
用沒有讀過理科的角度來觀看,碳原子在自然界會以12C、13C及其他形式的狀態呈現,其中以12C呈現的方式佔大多數,達98.89%。而13C的比例則為1.11%。528Please respect copyright.PENANAvLI7tHqt29
528Please respect copyright.PENANARy6MdpkAXJ
氧原子亦是同一道理,在自然界會以16O、18O及其他形式的狀態呈現。528Please respect copyright.PENANA4fD8Zub2XA
528Please respect copyright.PENANAPxZQJHuU9X
整個情形就像是明治香蕉朱古力一樣,雖然同是香蕉狀,但有極少數的朱古力會以黃金香蕉的方式呈現。528Please respect copyright.PENANAMT8Q782qan
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(圖3)位於深海的有孔蟲(Foraminifera)的外殼含有CaCO3物質。它們會與水產生反應,因而交換氧原子的呈現方式。528Please respect copyright.PENANAx81PQgkbsA528Please respect copyright.PENANAEpBvseY1gX
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非常重要的是,這反應會隨著溫度提升而加速進行。528Please respect copyright.PENANA2AWhyRjDHW
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亦即是說,溫度越高的話,越多有孔蟲外殼的CaCO3物質會以18O的方式呈現。528Please respect copyright.PENANAihfkhMhFDR
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(圖4)科學家透過測量不同年代的孔蟲化石外殼的氧原子狀態,從而推論出不同時代的海洋溫度。528Please respect copyright.PENANAoNRlEL1ciy528Please respect copyright.PENANAP588BQYYXJ
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從圖中可見,海洋的溫度正呈著不斷下降的趨勢。528Please respect copyright.PENANALpetbW0BYR
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海洋溫度會影響大海吸收二氧化碳的能力及內裡的生物鏈,而海洋溫度正不斷下降,究竟是好還是壞呢?528Please respect copyright.PENANAK5Qg4uE69q
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如果想我快啲出文的話,請入去Penana網站科普專欄–薯不揀單俾一個like以及Bookmark,這對我非常之重要。528Please respect copyright.PENANAjyxI3Aqo9I
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Link: https://www.penana.com/story/66244/%E7%A7%91%E6%99%AE%E5%B0%88%E6%AC%84-%E8%96%AF%E4%B8%8D%E6%8F%80%E5%96%AE/toc528Please respect copyright.PENANAKmBcECJKvG
528Please respect copyright.PENANACV5puyzlqh
同時亦可以在Penana網站裡按「買一嚿/半嚿薯仔」,以課金的方式推動我繼續搜羅資料寫文,多謝。528Please respect copyright.PENANAN0LwodCK5n
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Link:528Please respect copyright.PENANAVP28993mtm
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio528Please respect copyright.PENANAYc5Qv3UcFb
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除非Facebook及IG重開侵侵的account,否則我的IG將不會再作更新,只會寄居本土LIHKG及Penana。528Please respect copyright.PENANAaGpb8kRVtP
528Please respect copyright.PENANAzKW8QPXmy3
Ref1:https://www.ldeo.columbia.edu/~peter/Resources/Seminar/readings/Ravelo%20&%20Hillaire-Marcel.2007.pdf528Please respect copyright.PENANAjOJgR79Upp
Ref2:https://science.sciencemag.org/content/371/6534/1148528Please respect copyright.PENANAkKBswerLS1
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科普專欄–薯不揀單
作者:
薯仔聞茱莉

篇 #178
三十秒科學–海洋溫度正循著上升還是下降的趨勢?
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