[:ja]NASAの地球観測衛星TerraとAquaが撮影した米アラスカ州のカッパー川からアラスカ湾にかけての砂嵐の様子です。
このダストの成分は岩粉（氷河の浸食作用により粘土状に微細に砕かれた岩）で、通常の砂よりも微細です。また、この岩粉は海洋生物にとって重要な栄養素である鉄分を多く含んでおり、アラスカ湾の豊富な生態系を支えています。
カッパー川の地上の様子はこちらです。
参考文献： Iron in the Wind
ウェブ地球儀で地球俯瞰画像を見る： LiVEARTH
[Earthview Wonders] No.393: Plumes of Dust Over Gulf of Alaska🇺🇸
NASA’s Terra and Aqua satellites captured the image of wind-blown plumes of dust from from Alaska’s Copper River Valley.
Much of the dust is comprised of “glacial flour” or “rock flour” — a silty powder with grains finer than sand. While coastal waters in this part of Alaska have relatively high levels of iron, the micronutrient tends to be in short supply in deeper waters in the middle of the Gulf of Alaska. Soluble iron is an essential nutrient in marine ecosystems because phytoplankton—which sit at the center of marine food webs—depend on it to develop.
The local scenery on the ground of Copper River is as follows.
Reference: Iron in the Wind
See earthview photo gallery with web-globe: LiVEARTH[:en][Earthview Wonders] No.393: Plumes of Dust Over Gulf of Alaska🇺🇸
NASA’s Terra and Aqua satellites captured the image of wind-blown plumes of dust from from Alaska’s Copper River Valley.
Much of the dust is comprised of “glacial flour” or “rock flour” — a silty powder with grains finer than sand. While coastal waters in this part of Alaska have relatively high levels of iron, the micronutrient tends to be in short supply in deeper waters in the middle of the Gulf of Alaska. Soluble iron is an essential nutrient in marine ecosystems because phytoplankton—which sit at the center of marine food webs—depend on it to develop.
The local scenery on the ground of Copper River is as follows.
Reference: Iron in the Wind
See earthview photo gallery with web-globe: LiVEARTH[:]