Churning in the Chukchi Sea(翻腾的 Chukchi 海)

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Regardless of the amount of winter ice cover, the waters off of the Alaskan coast usually come alive each spring with blooms of phytoplankton. These blooms can form striking patterns of blue and green seawater, such as those visible in this image of the Chukchi Sea acquired on June 18, 2018, by the Operational Land Imager (OLI) on Landsat 8.

不考虑冬季冰盖的数量,基本上每年的春天,阿拉斯加海岸附近的水域都会随着浮游植物的盛放而显得生机勃勃.这些盛放的浮游植物可以形成引人注目的蓝色或者绿色的海水,例如这张由地球资源卫星8号上的军用陆地成像仪于2018年6月18日在 Chukchi 海拍摄到的图像.

Blooms are a common occurrence this time of year. But the regularity of the blooms and their simple beauty belie the complexity of this ecosystem.


Two main water masses flow from the Bering Strait and enter the southern Chukchi. One type, known as “Bering Sea Water,” is cool, salty, and rich in nutrients. This water fuels most of the phytoplankton growth, primarily diatoms, which are likely the main reason for the colorful green waters pictured here. (Sediments could also be contributing to the bright green areas.)

两个主要的水团从 Bering 海峡流入 Chukchi 的南部.其中一种被称作" Bering 海水域",这里的水很凉,有点咸并且富有营养.这种水为大部分浮游植物,例如硅藻类的生长提供了动力,这可能是图中绿色海水的主要成因.(沉积物也为明亮的绿色区域的形成贡献了作用.)

The second mass of seawater is known as “Alaskan Coastal Water,” which is warmer, less salty, and nutrient-poor. Diatom growth is usually lower in these waters, but coccolithophores can do well here. Some areas pictured here could contain this type of plankton, known to impart a milky turquoise hue to the water with their plates of calcium carbonate armor.


While experts expect blooms to consistently show up in these waters from year to year, the size is less consistent, and the reason is not clear.


Image Credit: NASA/U. S. Geological Survey/Norman Kuring/Kathryn Hansen
Last Updated: July 18, 2018
Editor: Yvette Smith

原文标题:Churning in the Chukchi Sea

The picture in this article and the English original text are all from NASA, translated the original text and translated for reference only.
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Original title: Churning in the Chukchi Sea