原因和浓度的红雨喀拉拉邦-地球科学堆栈交换江南电子竞技平台江南体育网页版 最近30从www.hoelymoley.com 2023 - 07 - 10 - t13:10:31z //www.hoelymoley.com/feeds/question/9316 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/9316 8 原因和红雨喀拉拉邦的浓度 arkaia //www.hoelymoley.com/users/111 2016 - 12 - 19 - t17:00:00z 2020 - 12 - 26 - t13:01:16z < p > < a href = " https://en.wikipedia.org/wiki/Red_rain_in_Kerala " rel = " noreferrer " >红雨< / >现象在喀拉拉邦,印度历史上多次报道(1896、2001、2012)。雨的颜色似乎是与空气的存在藻类的孢子< em > Trentepohlia annulata < / em >。我的问题是:< / p > < ul > <李>雨的孢子浓度是必要实现这个颜色?李李< / > < >什么物理和生物机制来实现这些悬浮浓度?

The "red rain" incident once happened in Kerala, India. Now, it happened in the Bangladesh. It was the after result of the red rain. Mistri para, Khulna, Bangladesh.

//www.hoelymoley.com/questions/9316/-/9330 # 9330 2 戈登斯坦格回答的原因和红雨喀拉拉邦的浓度 戈登斯坦格 //www.hoelymoley.com/users/4507 2016 - 12 - 22 - t13:09:39z 2016 - 12 - 22 - t13:09:39z < p >尽管明显的红色< em > Trentepohlia annulata < / em >和许多相关的物种都是蓝绿藻。红色色素来自βcaroteine和相关的天然色素。有很多这样的自然界中常见的色素,包括分数如果不是数以百计的化合物,包括颜色从黄色到橙色,红色和紫色,如。从地衣木树皮、胡萝卜、藏红花、甜菜根、和某些鸟类羽毛/喙-来源等等,不一而足。红色着色剂面具原始生物的自然绿色色调。这是一个强大的着色化合物这就是为什么beta-caroteine及其衍生物有时用于食品着色。< / p >

As to the concentration of algal spores, this is difficult to determine because the colour intensity is a function of the pH, exact chemical species of pigment, biological viability of the spores, and presence/absence of co-variable interacting ions in the water. As a very rough guide I would estimate that the concentration of pigment (not the concentration of spores) is likely to be in the order of 20 to 200 mg/l. For a bit of fun, you could get some beta-carotein-based food colourant and experiment on concentration and colour vs. pH.

Trentepohlia annulata and related algal species are pretty much ubiquitous in wet tropical and subtropical environments, but they don't like cold weather. The red colour in your photograph is extraordinary and very unusual. I would assume that conditions of nutrient availability, pH and temperature would have to be 'just right'.

My last comment is pure conjecture on my part - and I may be way off beam here - but maybe the intense red colour could be brought on by the physics of raindrop formation. If very moist warm air, rich in T.a algal cells was rapidly lofted in a tropical convection cell, the sudden cooling could kill off the algal cells, thereby rupturing the cell membranes, and triggering catastrophic release into solution of carotein-related pigment into resulting raindrops, which would normally pass unnoticed. Further concentration could occur by evaporative reduction of raindrop volume, especially if most of the rainfall dissipated into the atmosphere as so-called 'occult rainfall'.

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