Aqua_ep1_INTRO_youtube_hq.mov
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::::::[music]:::Narrator:  There is good reason why the Earth is called the "water planet.":::Unlike all other known planets, Earth has an abundance:::of oceans and white clouds and ice all strikingly visible from space.:::At least 70% of the Earth's surface:::is covered by ocean, and sizable portions of the land are covered by water:::in the form of soil moisture, ice and snow.  :::Water is also a major component of the Earth's atmosphere and is:::essential to all known forms of life:::Clouds typically cover at least half the Earth:::and water vapor is even more pervasive throughout the atmosphere.:::Water vapor is by far the most important greenhouse gas, helping to make:::our planet habitable. To understand our climate:::and to understand life on Earth, we need to understand how:::water systems work.:::Launch Announcer: Operations here at Vandenberg Air Force Base are going well this morning:::for the launch of the Aqua satellite on a Delta II launch vehicle. Liftoff is scheduled to:::occur on time at 2:55 a.m. Pacific Time.:::Six, five, four, three, two:::one ... and we have have liftoff of NASA's:::Aqua spacecraft, designed to study the Earth's water systems.:::[rocket sound]:::Narrator: NASA's Aqua spacecraft was launched on May 4th, 2002,:::, carrying six Earth-observing instruments to collect data about many:::aspects of the Earth's atmosphere, oceans, ice, land, and biosphere, :::with a major focus on water in all its forms.:::The Aqua spacecraft measures water vapor and clouds in the atmosphere:::liquid water and sea ice in the oceans,:::and glaciers, snow cover, and soil moisture on the land.:::To make these measurements, Aqua carries six Earth-observing instruments:::four from the U.S., one from Japan, and one from Brazil. :::All of them measure radiation,:::but different ones measure different kinds of radiation.:::For example, visible radiation, which is the type of radiation our eyes can see,:::is measured by three of teh Aqua instruments. This type of radiation is excellent for monitoring:::invisible phenomena like cloud cover.:::But just like our eyes, if an instrument only measures visible radiation:::it will have a hard time seeing through clouds, or seeing anything:::during periods of darkness. That's why Aqua's instruments:::also measure radiation outside the visible range in the:::infrared and microwave regions.:::Microwaves reaching Aqua's instruments are coming from the Earth's system and hence are not dependent:::on sunlight. And some of the microwaves pass straight through most:::clouds, giving Aqua the ability to see the Earth's surface,:::even on a cloudy day, and even during darkness.:::Every day, data pour down from the Aqua satellite:::and these data are processed for a wide range of users.:::Scientists use the data to improve our understandings of the Earth's very:::complicated and interconnected system, and weather forecasters, farmers,:::policmakers, businesses, and relief agencies use the :::Aqua data to make vital decisions that affect us all.:::[beep beep, beep beep, beep beep]:::
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