• ES Picture of the Day 15 2021

    From Black Panther@21:1/186 to All on Fri Jan 15 11:01:02 2021
    EPOD - a service of USRA

    The Earth Science Picture of the Day (EPOD) highlights the diverse processes and phenomena which shape our planet and our lives. EPOD will collect and archive photos, imagery, graphics, and artwork with short explanatory
    captions and links exemplifying features within the Earth system. The
    community is invited to contribute digital imagery, short captions and
    relevant links.


    Dark Spots and Patterns on Lake Ice

    January 15, 2021

    Mm_spots01 (002)a

    Mm_spots03 (003)b

    Photographer: Mr. Moose
    Summary Author: Mr. Moose

    Patterns on Lake Ice2222222222 A few weeks back, ice covered
    the lake near my home for the first time this season. It was quite thin
    (less than one-quarter inch or 6 mm) and completely clear and smooth
    and thus appeared rather dark since lake water was easily visible
    through it. Not until ice thickens and gets rough does it attain
    the matte white look that most people think of when they envision ice.

    During the early afternoon I noticed that a thin layer of snow covered
    the ice and also it was now littered with a few leaves (top photo).
    Later on, there were dark spots on the ice, and at the center of each
    spot was a leaf (inset photo). Later yet, these spots had grown in size
    (bottom photo). The leaves were melting the snow and exposing the ice,
    not because they were warm but rather because dark leaves absorb
    solar radiation more readily than does snow. This continued in a
    feedback loop where the dark spot on the ice then absorbed more
    radiation and continued to get larger and larger, even when the sky
    was overcast. Notice also the more star-like or spider-like pattern
    of the smaller spots (bottom photo). It should be mentioned that when
    the snow or ice is thicker, I never see this phenomenon. Photos taken
    on November 21, 2020.
    * Oneida County, Wisconsin Coordinates: 45.6751, -89.4617

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    Cryosphere Links

    * Guide to Frost
    * What is the Cryosphere?
    * Bentley Snow Crystals
    * Glaciers of the World
    * Ice, Snow, and Glaciers: The Water Cycle
    * The National Snow and Ice Data Center Google Earth Images
    * Snow and Ice Crystals

    -
    Earth Science Picture of the Day is a service of the Universities
    Space Research Association.

    https://epod.usra.edu

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  • From Black Panther@21:1/186 to All on Mon Feb 15 11:00:38 2021
    EPOD - a service of USRA

    The Earth Science Picture of the Day (EPOD) highlights the diverse processes and phenomena which shape our planet and our lives. EPOD will collect and archive photos, imagery, graphics, and artwork with short explanatory
    captions and links exemplifying features within the Earth system. The
    community is invited to contribute digital imagery, short captions and
    relevant links.


    Lunar Corona over Pistoia, Italy

    February 15, 2021

    IMG_1575-Modifica-2

    Photographer: Fabio Di Stefano
    Summary Author: Fabio Di Stefano

    After a cloudy, cold day recently, the evening sky cleared enough to
    present the lunar corona seen above. Coronas result from
    diffraction of moonlight (or sunlight) passing through
    mid-level clouds composed of tiny, similar-sized water
    droplets. Photo taken December 27, 2020.

    Photo Details: Camera: Canon EOS M6; Software: Adobe Photoshop
    Lightroom Classic 9.4 (Windows); Exposure Time: 0.200s (1/5); Aperture:
    ƒ/8.0; ISO equivalent: 200; Focal Length: 135.0mm
    * Pistoia, Italy Coordinates: 43.9343, 10.92557

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    Atmospheric Effects Links

    * Atmospheric Optics
    * Color and Light in Nature
    * The Colors of Twillight and Sunset
    * Refraction Index
    * Image Gallery: Atmospheric Effects
    * What is a Rainbow?

    -
    Earth Science Picture of the Day is a service of the Universities
    Space Research Association.

    https://epod.usra.edu

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  • From Black Panther@21:1/186 to All on Mon Mar 15 12:00:42 2021
    EPOD - a service of USRA

    The Earth Science Picture of the Day (EPOD) highlights the diverse processes and phenomena which shape our planet and our lives. EPOD will collect and archive photos, imagery, graphics, and artwork with short explanatory
    captions and links exemplifying features within the Earth system. The
    community is invited to contribute digital imagery, short captions and
    relevant links.


    Twilight from Mount Penteli, Greece

    March 15, 2021

    _MG_1915

    Photographer: Konstantinos Christodoulopoulos
    Summary Author: Konstantinos Christodoulopoulos; Jim Foster

    Shown above is the captivating twilight sky I observed several
    weeks ago from Mount Penteli in the Attica region of Greece.
    Its summit, known as Pyrgari, has an elevation of 3,638 ft (1,109 m).
    These rich, marigold colors occurred during the transition from
    civil to nautical twilight. When the Sun’s below the horizon, the
    indigo and blue colors are scattered from view by the increased
    path-length of sunlight, but the longer wavelength colors (yellows,
    oranges and reds) remain until nightfall. Photo taken on December 25,
    2020.
    Photo Details: Canon EF camera; 24 mm; f/3.5; USM lens; 2-second
    exposure; ISO 200; Digipod A 2541P Tripod; Manfrotto 496 RC2 Ball Head.
    * Mount Penteli, Greece Coordinates: 38.0667, 23.8833

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    Atmospheric Effects Links

    * Atmospheric Optics
    * Color and Light in Nature
    * The Colors of Twillight and Sunset
    * Refraction Index
    * Image Gallery: Atmospheric Effects
    * What is a Rainbow?

    -
    Earth Science Picture of the Day is a service of the Universities
    Space Research Association.

    https://epod.usra.edu

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  • From Black Panther@21:1/186 to All on Thu Apr 15 11:00:40 2021
    EPOD - a service of USRA

    The Earth Science Picture of the Day (EPOD) highlights the diverse processes and phenomena which shape our planet and our lives. EPOD will collect and archive photos, imagery, graphics, and artwork with short explanatory
    captions and links exemplifying features within the Earth system. The
    community is invited to contribute digital imagery, short captions and
    relevant links.


    Views of Sahara Dust over the Canary Islands (Spain) and Paris, France

    April 15, 2021

    Con Calima - Sin Calima - Satelite Dust3
    Photographers: Jose Fernandez Arozena; Bertrand Kulik
    Summary Authors: Jose Fernandez Arozena; Jim Foster
    Shown above (top photo) are two views from the window of my home in
    Santa Cruz de La Palma (Canary Islands), Spain, showing the
    contrast between a normal view (right) and a view obscured by dust
    carried westward by a storm originating over the Sahara Desert
    (left). PM10 values greater than 700 ug/m^3 were recorded,
    which is well above the range considered to be very poor air
    quality (more than 300 ug/m^3). A satellite view of this storm is inset
    at lower left.

    The view at right was taken a week later when the Northeast Trade
    Winds were blowing over the island of La Palma and sweeping the dust
    and haze out to sea. Top photo taken on February 16, 2021; bottom photo
    shows this dust layer as captured by Bertrand Kulik, above Paris,
    France, on February 21, 2021.
    * Coordinates

    * Santa Cruz de La Palma, Spain: 28.6840, -17.7646
    * Paris, France: 48.8566, 2.3522


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    Atmospheric Effects Links

    * Atmospheric Optics
    * Color and Light in Nature
    * The Colors of Twillight and Sunset
    * Refraction Index
    * Image Gallery: Atmospheric Effects
    * What is a Rainbow?

    -
    Earth Science Picture of the Day is a service of the Universities
    Space Research Association.

    https://epod.usra.edu

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  • From Black Panther@21:1/186 to All on Tue Jun 15 11:00:34 2021
    EPOD - a service of USRA

    The Earth Science Picture of the Day (EPOD) highlights the diverse processes and phenomena which shape our planet and our lives. EPOD will collect and archive photos, imagery, graphics, and artwork with short explanatory
    captions and links exemplifying features within the Earth system. The
    community is invited to contribute digital imagery, short captions and
    relevant links.


    Grim Clouds over the Paris Skyline

    June 15, 2021


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    Photographer: Bertrand Kulik

    Summary Authors: Bertrand Kulik Jim Foster

    Shown above is a view of the Parisian sky taken from a window of my
    home, in the 15^th District of Paris, on April 16, 2021. This rather
    somber sky features primarily stratocumulus clouds with some
    mammatus and or asperitas development (foreground). A patch or
    two of blue sky, however, gives hope that more cheerful weather is on
    the way.

    Photo details: Canon EOS 5D Mark III camera; TAMRON SP 15-30 mm
    lens; F/2.8 Di VC USD A012; ƒ/9.0; 30.0 mm; 1/500 second exposure; 100
    ISO.
    * Paris, France Coordinates: 48.8566, 2.3522

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    * Atmospheric Optics
    * The Cloud Appreciation Society
    * Cloud Atlas
    * Color and Light in Nature

    -
    Earth Science Picture of the Day is a service of the Universities
    Space Research Association.

    https://epod.usra.edu

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  • From Black Panther@21:1/186 to All on Thu Jul 15 11:00:36 2021
    EPOD - a service of USRA

    The Earth Science Picture of the Day (EPOD) highlights the diverse processes and phenomena which shape our planet and our lives. EPOD will collect and archive photos, imagery, graphics, and artwork with short explanatory
    captions and links exemplifying features within the Earth system. The
    community is invited to contribute digital imagery, short captions and
    relevant links.


    Cottonwood Trees

    July 15, 2021


    Roger_20210503_200210

    Photographer: Roger Hopkins:[ Roger@naturalhighs.net]
    Summary Author: Roger Hopkins:[ Roger@naturalhighs.net]

    These two stately Eastern Cottonwood trees ( Populus deltoides) were
    photographed in southwest Colorado. Mesa Verde National Park can be
    seen in the background.
    The left tree is a male, and the right tree is a female. So for a few
    days during spring, the tree on the left has red catkins, while the one
    on the right has green catkins. Once pollinated, the catkins on
    the male will fall off while the ones on the female will develop into
    seed capsules with tiny seeds attached to cotton-like strands. When
    released in early summer, the seeds give the species its common name.
    After these trees are leafed out and the seeds are shed, there’s no
    visible difference between the sexes. Nor can any such difference be
    detected once the leaves fall. Photo taken on May 3, 2021.
    * Dolores, Colorado Coordinates: 37.4739, -108.5045

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    Plant Links

    * Discover Life
    * Tree Encyclopedia
    * What are Phytoplankton?
    * Encyclopedia of Life - What is a Plant?
    * USDA Plants Database
    * University of Texas Native Plant Database
    * Plants in Motion
    * What Tree is It?

    -
    Earth Science Picture of the Day is a service of the Universities
    Space Research Association.

    https://epod.usra.edu

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  • From Black Panther@21:1/186 to All on Sun Aug 15 11:00:32 2021
    EPOD - a service of USRA

    The Earth Science Picture of the Day (EPOD) highlights the diverse processes and phenomena which shape our planet and our lives. EPOD will collect and archive photos, imagery, graphics, and artwork with short explanatory
    captions and links exemplifying features within the Earth system. The
    community is invited to contribute digital imagery, short captions and
    relevant links.


    Archive - Bonneville Salt Flats Panorama

    August 14, 2021

    6a0105371bb32c970b015393c1cce4970b Every weekend we present a
    notable item from our archives. This EPOD was originally published
    December 7, 2011.

    Photographer: Bret Webster
    Summary Authors: Bret Webster; Jim Foster
    The panorama above shows a view of the Bonneville Salt Flats and
    surrounding mountain ranges in northwestern Utah. Steady winds have
    ruffled Bonneville’s surface forming the conspicuous windrow. A
    combination of wind and water created these salt flats. When rain
    falls here, during the cold season, it accumulates in a very thin layer
    since the surface is so level it has nowhere to drain. As the weather
    warms, the shallow lake water slowly evaporates, adding a new layer
    of salt, chiefly potassium, magnesium or sodium chloride.
    Note that it's likely that the new salt is really a combination of old,
    recrystallized salt, as well as some new additional salts that
    drain into the lake from the surrounding hills. Panorama taken on July
    10, 2010.

    Photo Details: Camera: Canon EOS 5D Mark II; Focal Length: 15.0mm;
    Aperture: f/16.0; Exposure Time: 0.0040 s (1/250); ISO equiv: 40;
    Software: DXO Optics Pro v6.
    * Bonneville Salt Flats, Utah Coordinates: 40.79972, -113.8

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    Geology Links

    * Earthquakes
    * Geologic Time
    * Geomagnetism
    * General Dictionary of Geology
    * Mineral and Locality Database
    * Mohs Scale of Mineral Hardness
    * This Dynamic Earth
    * USGS
    * USGS Ask a Geologist
    * USGS/NPS Geologic Glossary
    * USGS Volcano Hazards Program

    -
    Earth Science Picture of the Day is a service of the Universities
    Space Research Association.

    https://epod.usra.edu

    --- up 14 weeks, 2 days, 12 hours, 15 minutes
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  • From Black Panther@21:1/186 to All on Wed Sep 15 11:00:30 2021
    EPOD - a service of USRA

    The Earth Science Picture of the Day (EPOD) highlights the diverse processes and phenomena which shape our planet and our lives. EPOD will collect and archive photos, imagery, graphics, and artwork with short explanatory
    captions and links exemplifying features within the Earth system. The
    community is invited to contribute digital imagery, short captions and
    relevant links.


    Parisian Mammatus Clouds

    September 15, 2021

    Parisian mammatus clouds

    Photographer: Bertrand Kulik

    Summary Author: Bertrand Kulik

    The photo above features several mammatus clouds taken over Paris
    following a storm. Most often found near thunderstorm anvil clouds,
    mammatus clouds are pouch-like pouches that are composed largely of ice
    and water vapor. Although they are associated with severe weather,
    especially hail and thunderstorms, the clouds are not a warning of bad
    weather to come. After around 10 to 15 minutes, the clouds usually
    disappear as the water droplets and ice slowly evaporate.

    Photo Details: Canon EOS 5D Mark III, EF50mm f/1.8 STM lens, ƒ/9.0,
    50.0 mm, 1/640 second exposure, ISO-50
    * Paris, France Coordinates: 48.8566, 2.3522

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    Cloud Links

    * Atmospheric Optics
    * The Cloud Appreciation Society
    * Cloud Atlas
    * Color and Light in Nature

    -
    Earth Science Picture of the Day is a service of the Universities
    Space Research Association.

    https://epod.usra.edu

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  • From Black Panther@21:1/186 to All on Fri Oct 15 11:00:32 2021
    EPOD - a service of USRA

    The Earth Science Picture of the Day (EPOD) highlights the diverse processes and phenomena which shape our planet and our lives. EPOD will collect and archive photos, imagery, graphics, and artwork with short explanatory
    captions and links exemplifying features within the Earth system. The
    community is invited to contribute digital imagery, short captions and
    relevant links.


    Sea Lung Jellyfish

    October 15, 2021

    IMGP5217 2

    Photographer: Michela Meda

    Summary Author: Michela Meda; Cadan Cummings

    The photo above features a jellyfish known in the Mediterranean as
    the “ sea lung” ( Rhizostoma Pulmo). The sea lung is a large
    species of jellyfish that has a semispherical-shaped cap and is
    opalescent, transparent white colored with a blue-violet edge. One of
    the larger species of jellyfish, the sea lung can reach impressive
    lengths over 59 inches (160 cm) long, grow to 20-24 inches (50-60 cm)
    in diameter, and weigh up to 22 pounds (10 kg). Anatomically, the
    central body area of a jellyfish is sometimes called a dumbbell and
    is composed of eight extensions of white curled and lumpy fabric, from
    which extends eight tentacles. The name of sea lung is due to the
    typical throbbing movement of the jellyfish as it swims, usually in
    shallow waters and lagoons. During the summer storms and the arrival of
    winter, jellyfish can become beached and sometimes these events can
    occur in large numbers.

    The sea lung eats primarily plankton and other small prey.
    Uniquely, this species of jellyfish often lives in symbiosis with
    small fish that protect it from the predators swimming inside the
    umbrella. Although moderately venomous, this type of jellyfish is
    not particularly dangerous to humans and only causes temporary minor
    irritation, burning skin, and itching for particularly sensitive
    individuals. This can occur In water when it releases stinging
    substances for defensive purposes that cause small abrasions of strong
    itching and slight burning.
    * Marina di Vasto, Chieti, Italy Coordinates: 42.111583, 14.708222

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    Animal Links

    * Animal Diversity Web
    * ARKive
    * BirdLife International
    * Bug Guide
    * Discover Life
    * Integrated Taxonomic Information System
    * Microbial Life Resources
    Earth Science Picture of the Day is a service of the
    -
    Universities Space Research Association.

    https://epod.usra.edu

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  • From Black Panther@21:1/186 to All on Mon Nov 15 11:00:36 2021
    EPOD - a service of USRA

    The Earth Science Picture of the Day (EPOD) highlights the diverse processes and phenomena which shape our planet and our lives. EPOD will collect and archive photos, imagery, graphics, and artwork with short explanatory
    captions and links exemplifying features within the Earth system. The
    community is invited to contribute digital imagery, short captions and
    relevant links.


    Fogbow Over Southern Ontario, Canada

    November 15, 2021

    Fogbow

    Photographer: Malcolm Park

    Summary Author: Malcolm Park; Cadan Cummings

    Around 8:00am local time on September 16, Southern Ontario, Canada
    was covered in a morning fog. It is not uncommon for fog to form in
    the late summer into the fall as temperatures begin to drop at night,
    which causes water vapor in the air to condense. I went for my
    morning walk, and I noticed this amazing fogbow in the west. This
    was by far the best fogbow I have ever seen, but I haven't seen that
    many. I checked on my phone, and the Sun was at about 12 degrees
    altitude above the eastern horizon when I captured this picture.
    Different to rainbows, fogbows form when light interacts with
    condensed water vapor (fog) in the air instead of the comparably larger
    diameter water droplets present after a rainstorm. In fact, it is this
    difference in droplet size that makes the fogbow less colorful because
    light is refracted and reflected differently in fog than by a
    raindrop. After my walk, I drove west for about an hour and the fog as
    well as fogbow persisted for most of the drive. So, it was widespread
    from my experience, and I also saw reports of it online from other
    areas of the province.

    Photo Details: iPhone SE using panorama mode
    * Ontario, Canada Coordinates: 44.365, -76.627

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    Cloud Links

    * Atmospheric Optics
    * The Cloud Appreciation Society
    * Cloud Atlas
    * Color and Light in Nature

    -
    Earth Science Picture of the Day is a service of the Universities
    Space Research Association.

    https://epod.usra.edu

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  • From Black Panther@21:1/186 to All on Wed Dec 15 11:00:30 2021
    EPOD - a service of USRA

    The Earth Science Picture of the Day (EPOD) highlights the diverse processes and phenomena which shape our planet and our lives. EPOD will collect and archive photos, imagery, graphics, and artwork with short explanatory
    captions and links exemplifying features within the Earth system. The
    community is invited to contribute digital imagery, short captions and
    relevant links.


    Crepuscular Ray and Venus

    December 15, 2021

    RaggioCrepuscolare_FG

    Photographer: Filippo Galati

    Summary Authors: Filippo Galati; Cadan Cummings

    This beautiful photograph shows a crepuscular ray projected towards
    Venus at sunset. Crepuscular rays are beams of sunlight that
    appear to radiate from a single point in the sky. The eye-catching
    phenomenon appears soon after time of sunset and is caused by a
    cloud or landscape feature on the horizon that partially blocks the
    sun’s light. Although crepuscular rays appear as diverging beams of
    light interspersed with areas of shadow, they are actually parallel to
    one another. This optical divergence is due to perspective.

    Photo details: Sony ILCE-7M3 + Tamron 28-75 @35mm HDR 5 shots f/9 ISO
    100
    * Modica, Province of Ragusa, Italy Coordinates: 36.8588, 14.7608

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    Cloud Links

    * Atmospheric Optics
    * The Cloud Appreciation Society
    * Cloud Atlas
    * Color and Light in Nature

    -
    Earth Science Picture of the Day is a service of the Universities
    Space Research Association.

    https://epod.usra.edu

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