迪朗达克州立公园空中赏叶
Our Operational Land Imager-2 on Landsat 9 acquired this vibrant image of deciduous trees and conifers in the Adirondack Mountains in northeast New York on Oct. 8, 2022. Adirondack Park, the largest state park in the contiguous United States, puts on a reliable show of seasonal color. Deciduous trees with especially vivid hues include sugar and red maples, as well as quaking and bigtooth aspens. Eastern larches also put on a showy display, but on this conifer, it is the needles, not leaves, that turn brilliant golden yellow in autumn.
Fall color reaches its peak when air temperatures drop and shortened daylight triggers plants to slow and stop the production of chlorophyll—the molecule that plants use to synthesize food. When the green chlorophyll pigment fades, various yellow and red pigments become visible.
See more satellite images of autumn from around the world.
Image Credit: NASA/Joshua Stevens/USGS
2022年10月8日，陆地卫星9号上的操作陆地成像仪-2拍摄到了纽约东北部阿迪朗达克山脉落叶树和针叶树的生动图像。迪朗达克州立公园是美国境内最大的州立公园，四季缤纷。色彩特别鲜艳的落叶树包括糖枫树和红枫树，以及颤杨树和大齿杨树。东方落叶松也有华丽的表现，但是在这种针叶树上，秋天变成明亮的金黄色的是针叶，而不是叶子。
当气温下降，日照缩短，植物减慢并停止叶绿素（植物用来合成食物的分子）的生成时，秋天的颜色达到顶峰。当绿色的叶绿素色素褪去，各种黄色和红色色素变得可见。
图片来源：NASA/Joshua Stevens/USGS