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?266Please respect copyright.PENANABBObM7XGjU
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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。266Please respect copyright.PENANAc7A33Aj0vB
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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。266Please respect copyright.PENANAETz7E43xkA
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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%。266Please respect copyright.PENANAVoSkVZKH1P
266Please respect copyright.PENANAdIteAYDAhE
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。266Please respect copyright.PENANAraspM6sxet
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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。266Please respect copyright.PENANAfbHKj3FGh6
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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。266Please respect copyright.PENANAzHPuOOZ0QI
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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。266Please respect copyright.PENANA2SUyICUb5O
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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。266Please respect copyright.PENANA9Y7MPG6BKA
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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。266Please respect copyright.PENANAZEgkew5LdD
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從圖中可見,海洋的溫度正呈著不斷下降的趨勢。266Please respect copyright.PENANAEVQ2TcgoVu
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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?266Please respect copyright.PENANAN5CTObj8oJ
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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。266Please respect copyright.PENANAVKEKw6sDsl
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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/toc266Please respect copyright.PENANAl0tbaucwt0
266Please respect copyright.PENANAnmASBdoo4H
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。266Please respect copyright.PENANANUsfZdVgQr
266Please respect copyright.PENANAsyQ6nRaFep
Link:266Please respect copyright.PENANAwTy1y94RIo
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio266Please respect copyright.PENANA2Rh2Y8b0vp
266Please respect copyright.PENANAPMmkzsmGwy
266Please respect copyright.PENANAMUbHgXoP7x
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。266Please respect copyright.PENANAK5EBxE36fZ
266Please respect copyright.PENANAYtYj5bosjX
Ref1:https://www.ldeo.columbia.edu/~peter/Resources/Seminar/readings/Ravelo%20&%20Hillaire-Marcel.2007.pdf266Please respect copyright.PENANAzV8sApNjmw
Ref2:https://science.sciencemag.org/content/371/6534/1148266Please respect copyright.PENANAmuf38A2ICG
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科普專欄–薯不揀單
Author:
薯仔聞茱莉
ISSUE #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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