{
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    "next": null,
    "previous": null,
    "results": [
        {
            "id": 30580,
            "url": "http://svs.gsfc.nasa.gov/30580/",
            "result_type": "Hyperwall Visual",
            "release_date": "2015-01-21T15:00:00-05:00",
            "title": "The Water Cycle",
            "description": "Diagram of the water cycle || water_cycle_print.jpg (1024x574) [110.8 KB] || water_cycle.png (4104x2304) [1.6 MB] || water_cycle_searchweb.png (320x180) [63.3 KB] || water_cycle_thm.png (80x40) [6.1 KB] || water_cycle_30580.pptx [1.6 MB] || water_cycle_30580.key [5.8 MB] || water_cycle.hwshow [71 bytes] || ",
            "hits": 124
        },
        {
            "id": 10926,
            "url": "http://svs.gsfc.nasa.gov/10926/",
            "result_type": "Produced Video",
            "release_date": "2012-03-08T12:00:00-05:00",
            "title": "Evaporation and Transpiration",
            "description": "Much of the water that soaks into the soil from irrigation or rain ultimately returns the the atmosphere as water vapor through direct evaporation from the surface or by transpiration through plant leaves as the plants use the water for growth and seed production. This loss cools the surface and plant canopy just like the evaporation of sweat cools our skin. A cool field in an arid area indicates water use by irrigation. Using the surface temperatures measured by satellites, and some additional information, water resource managers can determine the rate at which water is used in a farm field. || ",
            "hits": 306
        },
        {
            "id": 40098,
            "url": "http://svs.gsfc.nasa.gov/gallery/landsat/",
            "result_type": "Gallery",
            "release_date": "2012-02-23T00:00:00-05:00",
            "title": "Landsat",
            "description": "Since 1972, Landsat satellites have consistently gathered data about our planet for the benefit of the U.S. and the world. The Landsat data archive is the longest continuous remotely sensed global record of Earth’s surface, with all the data free and available to the public.  The Landsat satellite missions, jointly managed by NASA and the U.S. Geological Survey, are a central pillar of our national remote sensing capability and established the U.S. as a leader in land imaging.\n\nLandsat 9 is the next satellite in the program, and will add more than 700 scenes a day to this invaluable archive. As Earth’s population approaches 8 billion, Landsat 9 will extend our ability to detect and characterize land surface changes, and will do so at a scale where researchers can differentiate between natural and human-induced change. \r\n \r\nLand cover and land use are changing globally at rates unprecedented in human history. These changes bring profound consequences for weather, ecosystems, resource management, the economy, carbon storage and emissions, human health, and other aspects of society. Landsat datasets are a critical tool in monitoring and managing essential resources in a changing world.\r\n\nBelow are highlights of Landsat videos and graphics. Follow this link to see the entire collection of Landsat multimedia.\n",
            "hits": 183
        },
        {
            "id": 10885,
            "url": "http://svs.gsfc.nasa.gov/10885/",
            "result_type": "Produced Video",
            "release_date": "2012-01-12T00:00:00-05:00",
            "title": "The Water Cycle: Following The Water",
            "description": "One hundred and three trillion tons of rain and snow fall on land each year. A lot of that water, almost 66 trillion tons, goes right back into the air as water vapor from evaporation or plant transpiration. The remaining 37 trillion tons eventually returns to the oceans, restoring water that had evaporated, completing the water cycle. However, the path water takes before it reaches the oceans is complex. The land surface is very diverse, and characteristics such as soil type, slope and altitude affect how water moves. Does the water stay around long enough for plants or animals to consume? Is there enough water upstream of a community to maintain its water supply? How much water filters down to underground aquifers? Scientists study these questions because water plays such a vital role in our lives. The visualizations below illustrate on a globe and map the movement of water on land—from accumulation and storage of precipitation in soil layers, to its transport via interconnected systems of rivers throughout the planet. || ",
            "hits": 177
        },
        {
            "id": 3638,
            "url": "http://svs.gsfc.nasa.gov/3638/",
            "result_type": "Visualization",
            "release_date": "2009-10-09T00:00:00-04:00",
            "title": "Correlation Between Tropospheric Carbon Dioxide Concentration and Seasonal Variation of the Biosphere",
            "description": "This animation shows the correspondence between the drawdown of tropospheric carbon dioxide in the earth's atmosphere, and the seasonal variation of the biosphere of the earth. The pattern of white squares indicates regions where the concentration of tropospheric CO2 is higher than the trend, while regions devoid of the squares are areas where the CO2 concentrations are lower than the trend. The trend was calculated by a least-squares line fit to a moving 8-day global average of CO2 concentration provided by the AIRS instrument on the Aqua satellite, and increases over the course of the animation (Sept. 2002-Sept. 2006) from 374 ppm to 383 ppm. The biosphere data is provided by the SeaWiFS instrument aboard the SeaStar satellite.During spring and summer months, the consumption of CO2 through plant respiration increases, reducing the concentration of CO2 (the white squares) over the more productive areas. In the animation, this is seen as a tendency for the CO2 concentration to drop below the trend over areas of deeper green. The cycle is especially apparent in the Northern Hemisphere. || ",
            "hits": 74
        },
        {
            "id": 3754,
            "url": "http://svs.gsfc.nasa.gov/3754/",
            "result_type": "Visualization",
            "release_date": "2009-10-09T00:00:00-04:00",
            "title": "Endless Loop: Earth's Water Cycle",
            "description": "For circulating energy, for distributing essential chemistry, and as a fundamental requirement for most biological processes, water defines Earth's dynamic identity. The more than seventy percent of our planet covered by water is in many ways the reason life has survived and thrived for so long.A simple trip to the ocean's edge highlights how water constantly moves. But water sloshing back in forth in ocean basins only begins to describe the complex processes of its circulation on Earth.NASA takes the water cycle as not merely an academic exercise but as a vital area for exploration. Satellites can examine aspects of the global water cycle that in situ measurements and observations can only dream about seeing. The TRMM spacecraft is the world's most advanced precipitation measuring system to date, gathering vital information about tropical precipitation and other features every day. Other sensors, like the AMSR and AIRS instruments on the AQUA spacecraft take profiles of the planet's atmosphere, examine water vapor concentrations and distribution, among other things. A number of instruments look at water at or below the surface. MODIS makes sea surface temperature measurements that provide essential information about how oceans work and how they're changing over time. GRACE keeps track of elusive, yet massive, quantities of water both underground and in the oceans by making precise gravitational measurements. And the planned Aquarius mission, scheduled for launch in just a few years, will make unprecedented measurements of ocean salinity, a vital characteristic for describing a wide variety of phenomena, from life to physical processes that govern global circulation patterns. || ",
            "hits": 62
        },
        {
            "id": 20016,
            "url": "http://svs.gsfc.nasa.gov/20016/",
            "result_type": "Animation",
            "release_date": "2003-12-09T12:00:00-05:00",
            "title": "Aqua Mission Science Objectives",
            "description": "The Water Cycle  - Water falling from summer storm clouds onto a field of wheat today will someday fall again somewhere else. This is the essence of the water cycle.  The first step in the cycle is evaporation. Heated by sunlight, liquid water turns to vapor and enters the atmosphere. Another source of atmospheric water vapor is the respiratory process of plants.  Vapor leaves plants through tiny pores called stomata. This process is called transpiration. As moist air ascends into the atmosphere and encounters lower atmospheric pressure, the invisible water vapor transforms back into liquid water, and we see the next phase in the water cycle: condensation. Droplets of water coalesce from traces of vapor, and as they gain size by joining with other droplets, they yield the next part of the water cycle. This is called precipitation. The cycle is endless. As it's name suggests, the Aqua project will be intensely involved in studying the water cycle in its many forms.Evaporation - Depending on total ambient temperature, relative humidity, wind speed, and water temperature, some molecules of water are almost always passing from liquid to gaseous state at the surface. This is called evaporation. Evaporation is what puts moisture into the air, pulling water off the surface of lakes and streams and topsoil. Not only does water vapor enter the atmosphere, but also evaporating water pulls heat away from the surface. That heat will get redistributed to a different part of the atmosphere when the recently liberated water vapor re-condenses.Transpiration - Related to evaporation, this is the respiratory equivalent of breathing in plants. Transpiration is how plants lose water to the surrounding air. While some water directly evaporates through the walls of cells on the surface of plants, the majority of water lost happens through intercellular structures called stomata. These are like tiny pores. Transpiration helps pull nutrients from plant roots up to leaves. It's a natural process that's heavily influenced by ambient temperature, humidity, and other factors. Additionally, transpiration also helps properly circulate carbon dioxide and oxygen, diffusing the first into plant cells for growth, and carrying the second away from cells as waste gas.Condensation - The process that describes the change in physical state of a gas to a liquid is called condensation. Generally this is a phenomenon brought about by either of two processes: cooling of air to its dewpoint, or the addition of enough water vapor to bring the air to the point of saturation. But as that moisture either reaches high enough altitudes so that the air containing it is chilled by lower temperatures found there, or affected by increasing humidity from dynamic meteorological conditions, it condenses. The water molecules start moving more slowly, and the state of matter begins to change, as water molecules start hooking up. Gas becomes a liquid. Condensation can take many forms without necessarily falling from the sky. Dew, fog, mist, and clouds are all examples of condensed water.Precipitation - Simply speaking, precipitation is a function of water changing its material state from vapor to a liquid or a solid. But more specifically, two fundamental steps must take place for water to fall from the sky. The first is that basic precipitation components must develop. These include ice crystals that form around various minute particles in the atmosphere such as dust or salts. The second step is for those ice crystals or condensed droplets to grow. Because of their increasing size, larger droplets or ice crystals are more apt to collide with other particles of water, and thus more likely to fall or 'precipitate' out of a cloud. || ",
            "hits": 136
        },
        {
            "id": 20017,
            "url": "http://svs.gsfc.nasa.gov/20017/",
            "result_type": "Animation",
            "release_date": "2003-12-09T12:00:00-05:00",
            "title": "Aqua Mission Science Objectives",
            "description": "Water Vapor And Climate Change  - There is no more important greenhouse gas than water vapor. As one of the fundamental parts of Earth's atmosphere, water vapor affects global warming in both positive and negative terms, and offers a trail for scientists to follow towards a better understanding about how the planet functions as a whole.  It's also one of the principal aspects of the Earth's climate targeted for study by the Aqua satellite. By applying integrated analytic tools to the study of climate and climate change, experts hope to learn more specifically how water vapor and other greenhouse gasses move and function throughout the atmosphere. || ",
            "hits": 41
        }
    ]
}