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百万英里外看地球一年

One Year on Earth – Seen From 1 Million Miles

我是杰伊·赫尔曼 我是DSCOVR上领导EPIC项目的科学家
I’m Jay Herman. I’m the EPIC Lead Scientist for the DSCOVR mission.
在2015年的七月六日 我们公布了一张由美国宇航局的相机拍摄的地球的壮观景象的照片
On July 6, 2015, we released this spectacular image of Earth taken by NASA’s EPIC camera.
现在,我们将由EPIC捕捉到的3000多张图像重新按时间顺序组装
Now, we assembled more than 3,000 images captured by EPIC into a time-lapse sequence
它将为我们展示地球一年的运转情况
that shows a year in the life of our planet.
EPIC是2015年推出的DSCOVR卫星上一种研究地球科学仪器
EPIC is an Earth science instrument aboard the DSCOVR satellite, which launched in February 2015.
这个飞行器总停留在太阳与地球之间
The spacecraft always remains between the sun and the Earth
距离地球大约100万英里远,在一个被称为拉格朗日1的引力平衡点
approximately 1 million miles away, at a special gravitational balance point known as Lagrange 1.
在这个视角,EPIC每天至少看到十三次
From this view, EPIC sees the sunrise in the west and the sunset in the east
太阳在西方升起在东方落下
at least 13 times a day.
周围的阴霾是因为光的粒子在大气层中散射形成的
The haze seen around the edges is due to scattering of light by molecules in the atmosphere.
散射也是造成白天天空是蓝色、日落时天空是红色的原因
Scattering is also what makes the sky appear blue during the day and red at sunset.
显示的颜色是帮助我们估计一个坐在EPIC所在位置的人将会看到怎样的景象
The colors shown are our best estimate of what a human sitting at the location of EPIC would see.
EPIC每两小时至少拍下一组图像
EPIC takes at least one set of images about every two hours.
相机将用十种不同的波长记录每一组图像
The camera records each set in 10 different wavelengths.
至少三种不同波长的光——红、绿、蓝结合才能产生这种颜色的景象
At least three separate wavelengths–red, green, and blue–are combined to produce this color view.
在三月份,月亮从太阳和地球之间路过造成日全食现象
In March, the moon passed between the Earth and the sun causing a total solar eclipse.
在日全食中,月亮将它的阴影部分投射到地球上
During the eclipse, the moon cast its shadow over a portion of the planet.
如果我们把视频慢下来,我们可以看见月亮的阴影正在出现
If we slow the video down, we can see the moon’s shadow make an appearance right about now.
虽然每隔两小时才能从EPIC传回的图像中看到一次但是我们可以跟踪它的一些特征,比如云的移动
Although the view from EPIC is only once every two hours, we’re able to track features like the motion of clouds.
差不多地球的三分之二都被云层覆盖
Around two-thirds of the Earth is covered by clouds.
云层反射来自太阳的光线,帮助地球降温
Clouds reflect light from the sun, helping to keep the planet cool.
云层同样阻止了热量从表面散出,使地球变暖
They also trap heat rising from the surface, keeping the planet warm.
云层覆盖面积的变化影响热量平衡和地球暖度,这就是我们为什么研究它们的原因之一
Changes in cloud cover affect the heat balance and how warm the Earth becomes, which is one of the reasons why we study them.
由EPIC提供的每小时的地球向阳面的图像
The hourly images of the entire sunlit side of the Earth provided by EPIC
将用于研究整个地球每天的特征变化
will be used to study the daily variations of features over the entire globe
帮助我们更好的了解和保护我们的家园星球
helping us to better understand and protect our home planet.

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EPIC:DSCOVR

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。假面 Devi

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视频来源

https://www.youtube.com/watch?v=CFrP6QfbC2g

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