科学与数学neal.fun
深海
The Deep Sea
2019 — 2023，它一次次回到首页
黑点是上首页（≥ 50 分）的那次投稿，空心点是没冲上去的投稿，点越大分数越高。
导读
这是 neal.fun 的交互式深海可视化页面：向下滚动时，会按深度展示海洋生物、人类下潜纪录等内容，让人直观感受从浅海到深海的巨大尺度。评论中还讨论了深度标注的含义，并提到可以用 Ctrl+F 搜索生物名直接跳转。
为什么经久不衰：它把垂直深度变成可滚动、可感知的体验，兼具科普性和视觉冲击力，所以多年来反复登上首页仍值得一看。
HN 评论精选
质疑深度标注的含义，但赞赏页面可用 Ctrl+F 搜索生物名跳转。
非常酷，但我有点困惑这些深度代表什么——是下潜到该深度才开始看到这种动物，还是该动物生活的平均深度？我见过巨型太平洋章鱼在约20米处潜水，可这个可视化把它们列在770米。还是很酷，而且我很喜欢它能用纯文本搜索，比如 Ctrl+F 输入 octopus 就直接跳到对应深度。
ghostpepper查看英文原文
This is very cool but I'm a bit confused by what the depths represent - is it minimum depth you need to get down to before you start seeing the animal, is it the average depth that animal lives at? I've seen Giant Pacific Octopus diving around 20m, but this visualization lists them at 770m. Still very cool, and I love how it is searchable in plain text (eg. I can ctrl + f and type octopus and it takes me directly to the correct depth)
深海可能长期几乎未受人类影响，这种时间尺度上的恒定令人震撼。
滚动机制很好地传达了尺度！这让我产生一个以前没仔细想过的最酷念头：过去3000年里深海生命的变化一定很小？我们改变大气的时间，是否长到足以让环流把 pH 变化带到那么深？我们实际上重塑了地表、低层大气和海洋表层，但在深处……这些影响很小。偶尔有一艘船沉到海底，但相对于海洋面积只是沧海一粟。除此之外，生命可能和5000、10000、10万、100万、1000万年前非常相似，令人难以置信地恒定。
ethbr0查看英文原文
The scrolling mechanic was great for communicating scale! The coolest thought this gave me, that I'd never really considered before: How little life must have changed in the past 3000 years in the deep ocean? Have we even been adjusting the atmosphere for long enough for the circulation currents to take pH changes that deep? We've essentially remade the surface of the planet, the lower atmosphere, and the top of the ocean. But in the depths... little of this actually impacts them. From time to time, a single ship dropping down and coming to rest on the bottom. But those are a drop in the bucket compared to the ocean surface area. Other than that, life is probably very similar to what it was 5,000, 10,000, 100,000, 1,000,000, 10,000,000 years ago. Before modern humans existed, and certainly before industrial civilization. And probably before our species even existed. Mind bogglingly constant.
补充人类深潜纪录与高压舱实验的极端代价和生理影响。
评论补充：332米是人类水肺潜水最深纪录，Ahmed Gabr 在2014年下潜用了12分钟，上升却用了15小时；深潜维基上还有1992年701米的“模拟”潜水纪录。Hydra 10 由三名职业潜水员在 Marseille 的 Comex 氢氧高压舱完成：4周潜前准备、在10米海水当量处封闭2天、13天加压到675米、650–675米底部阶段3天并有一次701米短时下潜、24天减压；在650米及更深观察到高压神经综合征加重、震颤、肌阵挛、辨距不良、认知表现下降、运动障碍和本体感觉问题。
sbierwagen查看英文原文
>At 332 meters, this is the deepest any human has ever scuba dived. Set by Ahmed Gabr in 2014. Yes. It took him 12 minutes to descend to depth... and 15 hours to ascend. But if you take a look at the wikipedia article for deep diving you'll note there's a record for a "simulated" dive that's much deeper, 701 meters, done in 1992. Simulated how? Why was it never repeated? Well... https://web.archive.org/web/20180127104927/http://gtuem.praesentiert-ihnen.de/tools/literaturdb/project2/pdf/Gardette%20B.%20-%20EUBS%201993%20-%20S.%2032.pdf >Hydra 10 was performed in the Comex hydrogen hyperbaric facilities in Marseilles by three professional divers. >The dive protocol included: 4 weeks of pre-dive period, 2 day of confinement at 10 msw, 13 days of compression to 675 msw, 3 days of bottom stage between 650 and 675 msw with an excursion dive at 701 msw, 24 days of decompression with 8 working dives in wet chamber. How were the accommodations? >A 35 m^3 cylinderical chamber (internal diameter: 2.3 m - length: 9.35 m) with living area and sleeping quarters and sanitaires. Cozy. Spending 42 days in a steel can pooping a foot away from two new best friends must have been interesting. Did they have fun, at least? >At 650 msw (6.6 MPa) and deeper, we particularly observed: >- An increasing HPNS with: slight tremor, myoclonia, mysmetria which induced psychometric and intellectual performance decrease. >- A dyskinesia associated to proprioception troubles with muscular weakness. >- A decrease in appetites which required a change in the divers nutrition. >- Sleep disturbance with decrease of deep sleep phases.
提醒深海采矿即将大规模展开，值得关注。
很美！一篇非常重要的文章，讲我们即将以前所未有的规模开始开采这些区域：https://www.theatlantic.com/magazine/archive/2020/01/20000-feet-under-the-sea/603040/
tectonic查看英文原文
Beautiful! A really important article about how we’re about to start mining these regions on an unprecedented scale: https://www.theatlantic.com/magazine/archive/2020/01/20000-feet-under-the-sea/603040/
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