NASA: Elevation Map of Badain Jaran Desert - Mongolia - Enlarged views - Vistas agrandadas - Ricardo Marcenaro words - palabras
Posted by Ricardo Marcenaro | Posted in NASA: Elevation Map of Badain Jaran Desert - Mongolia - Enlarged views - Vistas agrandadas - Ricardo Marcenaro words - palabras | Posted on 18:58
Open your mind, your heart to other cultures
Abra su mente, su corazón a otras culturas
You will be a better person
Usted será una mejor persona
RM
Abra su mente, su corazón a otras culturas
You will be a better person
Usted será una mejor persona
RM
Spread sand on an even surface so that the layer is perfectly flat. You might think that gravity should keep the layer even. But even a flat layer of sand is unstable because grain sizes differ and respond differently to the same breeze. A light wind can form ripples on a sand surface in just minutes. Over years, centuries, and millennia, winds can sculpt sand into incredibly complex shapes.
Some of our planet’s most elaborate sand dunes are found in the Badain Jaran Desert, in the western part of Inner Mongolia. Researchers have long puzzled over how to best study these dunes, but mapping them in three dimensions has become much easier, thanks to a NASA satellite. The images shown here offer two views of the Badain Jaran Desert as observed by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) on NASA’s Terra satellite.
The top image is an elevation map made from the ASTER Global Digital Elevation Model (GDEM), released in 2009. The image shows dune peaks in off-white, and the low-lying areas between dunes in green. The white rectangle indicates the area shown in the bottom image, which was acquired on December 13, 2007, and made from a combination of visible and near-infrared (VNIR) light.
Dunes and small lakes mingle in the Badain Jaran, with the lakes occurring in flat areas between dunes. (A few lakes appear in the VNIR image; the lake near the upper right corner of the image is tinged with blue.) In the VNIR image, sunlight illuminates south-facing dune surfaces while leaving north-facing surfaces in shadow. The dunes are incredibly complicated—described in a 2009 study as “complex reversing mega-dunes developed from compound barchanoid mega-dunes.”
A barchan dune is crescent shaped, with “horns” pointing in the same direction as the wind blows. Barchan dunes tend to form in areas with steady wind direction and limited amounts of sand. Where more sand is available, and where wind direction is more variable, more complicated dunes can form. Reversing dunes often occur in areas where winds blow from opposite directions. The prevailing wind creates barchanoid dunes, and occasional winds from the opposite direction produce small dunes on the crests of the big dunes. Compound dunes are made from multiple dunes of the same type that overlap or overlie each other. Complex dunes are made from different types of dunes merging or overlapping.
By offering three-dimensional data, the ASTER GDEM has enabled researchers to better understand the formation of complicated dunes. Besides the Badain Jaran, the GDEM has also shed light on the formation of dunes in the Empty Quarter (Rub’ al Khali) of Saudi Arabia.
References
- Dong, Z., Qian, G., Luo, W., Zhang, Z., Xiao, S., Zhao, A. (2009). Geomorphological hierarchies for complex mega-dunes and their implications for mega-dune evolution in the Badain Jaran Desert. Geomorphology, 106, 180–185.
- Hugenholtz, C.H., Barchyn, T.E. (2010). Spatial analysis of sand dunes with a new global topographic dataset: new approaches and opportunities. Earth Surface Processes and Landforms, 35, 986–992.
- Mangimeli, J. (n.d.) Geology of Sand Dunes. U.S. National Park Service. Accessed April 5, 2011.
NASA Earth Observatory images created by Jesse Allen, using data provided courtesy of NASA/GSFC/METI/ERSDAC/JAROS, and U.S./Japan ASTER Science Team. Caption by Michon Scott.
- Instrument:
- Terra - ASTER
- Enlarged Views - Vistas Alargadas
- A selection - Una selección
- I touched the photos to dramatize the sculptural forms of the desert Toqué las fotos para dramatizar las formas escultóricas del desierto
Phantasmagorias, an antique writing of forms in the shadows, like in a great mural, the eye in the sky rounds, looking for new senses, symbols.
Fantasmagorías, una escritura antigua de las formas en las sombras, como en un gran mural, el ojo en las rondas de cielo, en busca de nuevos sentidos, símbolos.
Patterns, the nature governed by them, vein of the heart of the sand, in the garden is blowing an eternal song of the amnesic, have to pass, have to forget, dream in a dream, lonelyness, thinking, a pulse of drums in the head, have to forget, have to pass, wolf of wolf, beware of your traces. Logy.
Patrones, la naturaleza regida por ellos, la vena del corazón de la arena, en el jardín sopla una canción eterna de la amnesia, tiene que pasar, hay que olvidar, sueño en un sueño, la soledad, pensar, un pulso de tambores en la cabeza, hay que olvidar, tienen que pasar, el lobo del lobo, ten cuidado con tus huellas. Logía.
Patrones, la naturaleza regida por ellos, la vena del corazón de la arena, en el jardín sopla una canción eterna de la amnesia, tiene que pasar, hay que olvidar, sueño en un sueño, la soledad, pensar, un pulso de tambores en la cabeza, hay que olvidar, tienen que pasar, el lobo del lobo, ten cuidado con tus huellas. Logía.
Snails buried, glyphs, eagles, face of magicians, deformed in a plasticity of a primordial soup, becoming new and old at the same time, perpetual change, where the transmutation of values has deleted the meanings, only the silence knows, only to the silence that I'm hearing. In peace.
Los caracoles enterrado, glifos, águilas, cara de los magos, deformada en una plasticidad de sopa primordial, convirtiéndose en nueva y vieja al mismo tiempo, cambio perpetuo, donde la transmutación de los valores ha suprimido los significados, sólo el silencio sabe, sólo el silencio que estoy oyendo. En la paz.
Los caracoles enterrado, glifos, águilas, cara de los magos, deformada en una plasticidad de sopa primordial, convirtiéndose en nueva y vieja al mismo tiempo, cambio perpetuo, donde la transmutación de los valores ha suprimido los significados, sólo el silencio sabe, sólo el silencio que estoy oyendo. En la paz.
And in the silences, I live.
Y en los silencios, yo vivo.
RM
Thanks for the beauty, for the everyday work, dear NASA.
Gracias por la belleza, por el trabajo diario, querida NASA.
RM
NASA: Elevation Map of Badain Jaran Desert - Mongolia - Enlarged views - Vistas agrandadas - Ricardo Marcenaro words - palabras
You have an alphabetical guide in the foot of the page in the blog: solitary dog sculptor
In the blog: Solitary Dog Sculptor I, the alphabetical guide is on the right side of the page
Thanks
Usted tiene una guía alfabética al pie de la página en el blog: solitary dog sculptor
En el blog: Solitary Dog Sculptor I, la guia alfabética está en el costado derecho de la página
Gracias
Ricardo M Marcenaro - Facebook
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My blogs are an open house to all cultures, religions and countries. Be a follower if you like it, with this action you are building a new culture of tolerance, open mind and heart for peace, love and human respect.
Thanks :)
Mis blogs son una casa abierta a todas las culturas, religiones y países. Se un seguidor si quieres, con esta acción usted está construyendo una nueva cultura de la tolerancia, la mente y el corazón abiertos para la paz, el amor y el respeto humano.
Gracias :)
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