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?477Please respect copyright.PENANAeiuNHiKC5Z
477Please respect copyright.PENANAoRXikM3jsJ
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。477Please respect copyright.PENANALQ5zcu97al477Please respect copyright.PENANA5qXEeIyZQ6
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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。477Please respect copyright.PENANATT6IPsYBfl477Please respect copyright.PENANAO5NJ4ziHpY
477Please respect copyright.PENANAg0u0QE6P7m
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%。477Please respect copyright.PENANAq4kPLN0HRA
477Please respect copyright.PENANAD4RBQls7gz
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。477Please respect copyright.PENANA9CzK2ejId8
477Please respect copyright.PENANAvqmPRbiklz
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。477Please respect copyright.PENANAzhZQSxMSY6
477Please respect copyright.PENANAj7tZlpWoLv
(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。477Please respect copyright.PENANAVWWP3lMu2J477Please respect copyright.PENANAvC80hDqkl2
477Please respect copyright.PENANAA0KImM12Cm
非常重要的是,這反應會隨著溫度提升而加速進行。477Please respect copyright.PENANAm8C9MuQmiW
477Please respect copyright.PENANALZfj2teNAc
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。477Please respect copyright.PENANANLZ7hn7D0n
477Please respect copyright.PENANAqGKzuWdArF
(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。477Please respect copyright.PENANAS06Wly3Fok477Please respect copyright.PENANA08QONq61ZY
477Please respect copyright.PENANAguV219znQZ
從圖中可見,海洋的溫度正呈著不斷下降的趨勢。477Please respect copyright.PENANAurIzCqklAD
477Please respect copyright.PENANAAO36dz4QdW
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?477Please respect copyright.PENANAlE77CMd6uj
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477Please respect copyright.PENANABjkFIxH3VK
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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。477Please respect copyright.PENANAJbv3asfAf2
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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/toc477Please respect copyright.PENANAM9k9Pbhzjn
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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。477Please respect copyright.PENANAK3aq38TR8I
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Link:477Please respect copyright.PENANAwDRzgXCxci
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio477Please respect copyright.PENANAAMYFuSOtie
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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。477Please respect copyright.PENANAKn5zu63Dwl
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Ref1:https://www.ldeo.columbia.edu/~peter/Resources/Seminar/readings/Ravelo%20&%20Hillaire-Marcel.2007.pdf477Please respect copyright.PENANA1xmDRPsEmY
Ref2:https://science.sciencemag.org/content/371/6534/1148477Please respect copyright.PENANAMSiOsrQjxV
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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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