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    earth


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      National Aeronautics and

      Space Administration

      The poetry of earth is ceasing never.

      —John Keats

      “On the Grasshopper and Cricket”

      Library of Congress Cataloging-in-Publication Data Names: Carlowicz, Michael J., author. | Friedl, Lawrence, author. | Ward, Kevin A., 1968- author. | United States. National Aeronautics and Space Administration, issuing body.

      Title: Earth / Michael Carlowicz, Lawrence Friedl, Kevin Ward.

      Description: Washington, DC : National Aeronautics and Space Administration, Earth Science, NASA Headquarters, [2018]

      Identifiers: LCCN 2018048628| ISBN 9781626830479 (hardback) | ISBN 1626830479

      (hardback)

      Subjects: LCSH: Earth (Planet)--Photographs from space. | Earth

      (Planet)--Remote-sensing images. | Earth (Planet)

      Classification: LCC QB637 .C37 2018 | DDC 910.020222--dc23 | SUDOC NAS 1.2:EA 7/21

      LC record available at https://lccn.loc.gov/2018048628

      THRAE

      ii

      Contents

      vi Foreword

      2 Atmosphere

      4

      Curving Cloud Streets, Brazil and Bolivia

      6

      A Trio of Plumes, South Atlantic Ocean

      8

      Filling the Valleys, Peru

      10

      A Glorious View, Pacific Ocean

      12

      Punching Holes in the Sky, United States

      14

      Bering Streets, Arctic Ocean

      16

      Riding the Waves, Mauritania

      18

      Cloud Shadow, Germany

      20

      Double Trouble, Pacific Ocean

      24

      Making Tracks, Pacific Ocean

      26

      Tracing the Coast, China

      28

      Four Mountains Stand Out, Pacific Ocean

      32

      Framing an Iceberg, South Atlantic Ocean

      sTn

      34

      Valley Fog, Canada

      eT

      36

      Holuhraun Lava Field, Iceland

      n

      38

      Lofted Over Land, Madagascar

      Co

      THRAe

      iv

      40 Water

      118

      Taranaki and Egmont, New Zealand

      42

      Channel Country, Australia

      120

      Cultivating a Border, China and Kazakhstan

      44

      Tea-Colored Rupert Bay, Canada

      122

      Barrier Islands, Brazil

      48

      Coral Cocos, Indian Ocean

      124

      Tsauchab River Bed, Namibia

      50

      Bay of Whales, Russia

      126

      Ice and Snow

      52

      Storms Stir Up Sediment, Bermuda

      128

      Mertz Loses Part of Its Tongue, Antarctica

      54

      The Meeting of the Waters, Brazil

      130

      Swimming with Ice Cubes, United States

      56

      A Lava Lamp Look at the Atlantic, Atlantic Ocean

      132

      Franz Josef Land, Arctic Ocean

      58

      Teeming Life in the Strait of Georgia, Canada

      134

      No Green in This Land, Greenland

      60

      Ephemeral Lake Frome, Australia

      136

      Mackenzie Meets Beaufort, Canada

      62

      Dueling Blooms, Barents Sea

      138

      Sea Ice at Shikotan, Japan and Russia

      64

      A Bay Sculpted by Ice, Canada

      140

      North Patagonian Icefield, South America

      66

      Tidal Flats and Channels, Bahamas

      144

      Manning Island and Foxe Basin, Canada

      68

      The Blooming Baltic, Baltic Sea

      146

      Ice Water, United States

      70

      Waves Beneath the Waves, Trinidad

      148

      Omulyakhskaya and Khromskaya, Russia

      72

      Land of Lakes, Canada

      150

      Phytoplankton on Ice, Antarctica

      74

      Plankton and Sulfur, Namibia

      152

      Heart-Shaped Uummannaq, Greenland

      76

      Åland Islands, Scandinavia

      154

      Puma Yumco, China

      78

      Crater Lakes with Clear Water, Canada

      156

      Grounded in the Caspian, Kazakhstan

      80

      Mergui Archipelago, Southeast Asia

      158

      Ice-Covered Delta, Canada

      82

      Scarlet Lake Natron, Tanzania

      160 Appendix

      84

      Swirling Bloom off Patagonia, Argentina

      164 Acknowledgments

      86 Land

      88

      A Curious Ensemble of Wonderful Features, United States

      166 Credits

      92

      Megadunes and Desert Lakes, Mongolia

      168

      About the Authors

      94

      Colorful Faults of Xinjiang, China

      96

      Bowknot Bend, United States

      98

      From Rainforest to Rain Shadow, United States

      100

      A Blaze of Color, Sweden

      102

      Folds and Curves of the Kavir, Iran

      104

      Fanning Out in Farmland, Kazakhstan

      108

      The Zones of Kilimanjaro, Tanzania

      110

      Liwa Oasis, United Arab Emirates

      112

      Don Juan Pond, Antarctica

      114

      Linear Dunes, Caprivi Strip, Namibia

      116

      Harratt Lunayyir Lava Field, Saudi Arabia

      Foreword

      of all celestial bodies within reach or view, as far as we can

      see, out to the edge, the most wonderful and marvelous and

      mysterious is turning out to be our own planet earth. There is

      nothing to match it anywhere, not yet anyway.

      —Lewis Thomas

      Sixty years ago, with the launch of Explorer 1, NASA made

      its first observations of Earth from space. Fifty years ago,

      astronauts left Earth orbit for the first time and looked back

      at our “blue marble.” All of these years later, as we send

      spacecraft and point our telescopes past the outer edges of

      the solar system, as we study our planetary neighbors and

      our Sun in exquisite detail, there remains much to see and

      explore at home.

      dRo

      We are still just getting to know Earth through the tools of

      we

      science. For centuries, painters, poets, philosophers, and

      Ro

      photographers have sought to teach us something about our

      F

      home through their art.

      THRAE

      vi

      This book stands at an intersection of science and art. From NASA has a unique vantage point for observing the beauty and

      its origins, NASA has studied our planet in novel ways, using

      wonder of Earth and for making sense of it. Looking back from

      ingenious tools to study physical processes at work—from

      space, astronaut Edgar Mitchell once cal ed Earth “a sparkling

      beneath the crust
    to the edge of the atmosphere. We look at it

      blue and white jewel,” and it does dazzle the eye. The planet’s

      in macrocosm and microcosm, from the flow of one mountain

      palette of colors and textures and shapes—far more than just

      stream to the flow of jet streams. Most of al , we look at Earth blues and whites—are spread across the pages of this book.

      as a system, examining the cycles and processes—the water

      We chose these images because they inspire. They tell a story

      cycle, the carbon cycle, ocean circulation, the movement of

      of a 4.5-bil ion-year-old planet where there is always something heat—that interact and influence each other in a complex,

      new to see. They tell a story of land, wind, water, ice, and air dynamic dance across seasons and decades.

      as they can only be viewed from above. They show us that no

      We measure particles, gases, energy, and fluids moving in, on,

      matter what the human mind can imagine, no matter what the

      and around Earth. And like artists, we study the light—how it

      artist can conceive, there are few things more fantastic and

      bounces, reflects, refracts, and gets absorbed and changed.

      inspiring than the world as it already is. The truth of our planet Understanding the light and the pictures it composes is no

      is just as compel ing as any fiction.

      small feat, given the rivers of air and gas moving between our

      We hope you enjoy this satel ite view of Earth.

      satel ite eyes and the planet below.

      It is your planet. It is NASA’s mission.

      For all of the dynamism and detail we can observe from orbit,

      Michael Carlowicz

      sometimes it is worth stepping back and simply admiring Earth.

      It is a beautiful, awe-inspiring place, and it is the only world most of us will ever know.

      The astonishing thing about the Earth…

      is that it is alive.... Aloft, floating free

      beneath the moist, gleaming membrane

      of bright blue sky, is the rising Earth, the

      only exuberant thing in this part of the

      cosmos…. It has the organized,

      self-contained look of a live creature,

      full of information, marvelously skilled

      in handling the Sun.

      —Lewis Thomas

      The Lives of a Cel

      E

      HERPSOMTA

      THRAE

      2

      atmosphere

      Curving Cloud Streets

      Brazil and Bolivia

      To the human eye, the wind is invisible. It can only be visualized by proxy, by its expressions in other phenomena like blowing leaves, airborne dust, white-capped waters—or the patterns of clouds.

      Acquired in June 2014 by the Aqua satel ite, this image shows a broad swath of the Amazon rainforest in Brazil and Bolivia as it appeared in the early afternoon. As sunlight warms the forest in the morning, water vapor rises on columns of heated air. When that humid air runs into a cooler, more stable air mass above, it condenses into fluffy cumulus clouds.

      Cumulus cloud streets often trace the direction, and sometimes the intensity, of winds—lining up paral el to the direction of the wind.

      Usual y this means a straight line, but clouds can also line up along the concentric, curved lines of high-pressure weather systems, as they did here.

      E

      HERPSOMTA

      THRAE

      4

      A Trio of Plumes

      South Atlantic Ocean

      The uninhabited South Sandwich Islands include several active stratovolcanoes. Due to their remote location, these volcanoes are some of the least studied in the world, though satel ites often catch them erupting.

      The combination of clouds and ice at these latitudes can make it difficult to see plumes of volcanic ash in natural-color imagery.

      But using portions of the electromagnetic spectrum that are typical y invisible to the naked eye (such as infrared) enables satel ites to distinguish ice from ash and clouds. The Aqua satel ite captured this false-color image in September 2016. Note the three bright white plumes running down the middle third of the page; they are warmer and brighter in infrared than the cooler ice clouds (teal) around them.

      Researchers have learned that even small eruptions like this can affect cloud cover and weather. The tiny solid and liquid particles in the plume (aerosols) act as seeds for the formation of cloud droplets.

      E

      HERPSOMTA

      THRAE

      6

      Filling the Valleys

      Peru

      The val eys along Peru’s southern coast are among the deepest on Earth. They are also frequently fil ed with clouds. In July 2015, Landsat 8 captured this view of the cloud-fil ed canyons through which the Yauca and Acarí rivers empty into the Pacific Ocean.

      You can’t see it, but the Pacific lies below the clouds on the lower left. The clouds are marine stratocumulus—a type of low-level cloud so close to the surface that it is essential y fog. Such clouds are a persistent feature off the coast of Peru and Chile, developing most often during the winter and early spring. On some occasions, prevailing winds can push the clouds inland.

      Because the marine clouds are low, they are easily blocked by coastal mountains and hil s, such as the Andes. But in areas where low val eys open to the ocean, the clouds move inland.

      E

      HERPSOMTA

      THRAE

      8

      A Glorious View

      Pacific Ocean

      A layer of stratocumulus clouds over the Pacific Ocean serves as the backdrop for this rainbow-like phenomenon known as a glory.

      Glories form when water droplets within clouds scatter sunlight back toward a source of il umination (in this case, the Sun).

      Although glories may look similar to rainbows, the way light is scattered to produce them is different. Rainbows are formed by refraction and reflection; glories are formed by backward diffraction. From the ground or from an airplane, glories appear as circular rings of color. In this image, however, the glory is stretched vertical y because of how the imager scans the surface in swaths.

      Note, too, the swirling von Kármán vortices visible to the right of the glory. The alternating rows of vortices form as air masses run into an obstacle—the island of Guadalupe—and form a wake behind it.

      E

      HERPSOMTA

      THRAE

      10

      Punching Holes in the Sky

      United States

      In December 2009, the Landsat 5 satel ite observed this extraordinary example of “hole-punch clouds” over West Virginia.

      This strange phenomenon results from a combination of cold temperatures, air traffic, and atmospheric instability.

      If you were to look from below, it would appear as if part of the cloud were fal ing out of the sky. As it turns out, that is actual y what is happening. The clouds are initial y composed of liquid drops at a super-cooled temperature below 0° Celsius. As an airplane passes through a cloud, particles in the exhaust can create a disturbance that triggers freezing. Ice particles then quickly grow at the expense of water droplets. Eventual y, the ice crystals in these patches of clouds grow large enough that they literal y fall out of the sky, earning hole-punch clouds their alternate name: “fal streak holes.”

      In this false-color image, pink and faint blue areas are typical water-rich clouds, and bright cyan areas are ice clouds.

      The hole-punch areas appear dark around the ice clouds.

      E

      HERPSOMTA

      THRAE

      12

      Bering Streets

      Arctic Ocean

      Winds from the northeast pushed sea ice southward and formed cloud streets—paral el rows of clouds—over the Bering Strait in January 2010. The easternmost reaches of Russia, blanketed in snow and ice, appear in the upper left. To
    the east, sea ice spans the Bering Strait. Along the southern edge of the ice, wavy tendrils of newly formed, thin sea ice predominate.

      The cloud streets run in the direction of the northerly wind that helps form them. When wind blows out from a cold surface like sea ice over the warmer, moister air near the open ocean, cylinders of spinning air may develop. Clouds form along the upward cycle in the cylinders, where air is rising, and skies remain clear along the downward cycle, where air is fal ing. The cloud streets run toward the southwest in this image from the Terra satel ite.

      E

      HERPSOMTA

      THRAE

      14

      Riding the Waves

      Mauritania

      You cannot see it directly, but air masses from Africa and the Atlantic Ocean are col iding in this Landsat 8 image from August 2016.

      The col ision off the coast of Mauritania produces a wave structure in the atmosphere.

      Cal ed an undular bore or solitary wave, this cloud formation was created by the interaction between cool, dry air coming off the continent and running into warm, moist air over the ocean. The winds blowing out from the land push a wave of air ahead like a bow wave moving ahead of a boat.

      Parts of these waves are favorable for cloud formation, while other parts are not. The dust blowing out from Africa appears to be riding these waves. Dust has been known to affect cloud growth, but it probably has little to do with the cloud pattern observed here.

      E

      HERPSOMTA

      THRAE

      16

      Cloud Shadow

      Germany

      In November 2012, the Earth Observing-1 satel ite acquired this image of a layer of clouds casting a distinctive shadow on another, lower cloud layer. The upper deck was more than 1 kilometer (0.6 miles) above the ground. Both layers were composed of stratus clouds, a low-lying type that tends to be uniform and flat. When the satel ite’s Advanced Land Imager acquired the image, the clouds were over northeastern Germany near Harz National Park.

      While local meteorological conditions affect cloud height, the latitude at which clouds form is also important. Almost all clouds exist in the lowest level of the atmosphere, the troposphere. However, the depth of the troposphere varies by latitude—thinner near the poles than the Equator, so clouds can occur at higher levels in the tropics than they do at high- and mid-latitudes.

      E

      HERPSOMTA

      THRAE

      18

      Double Trouble

      Pacific Ocean

     


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