Sentences with phrase «water ice clouds»

During aphelion water ice clouds form in the atmosphere, interacting with the dust particles and affecting the temperature of the planet.

Interannual variability of water ice clouds over major martian volcanoes observed by MOC J. L. Benson, P. B. James, B. A. Cantor and R. Remigio Icarus 184, 365 — 371, doi: 10.1016 / j.icarus.2006.03.014, October 2006.

This composite of 7.5 km (4.7 mi) per pixel daily global images, acquired by the Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC), shows water ice clouds over and to the east (right) of the Mars Exploration Rover (MER - B), Opportunity, landing site in Meridiani Planum.

Here, bluish - white water ice clouds hang above the Tharsis volcanoes.

Not exact matches

Newly formed ice crystals fall earthward, and the energy released in their transition from liquid to solid evaporates nearby water drops, leaving a hole in the cloud.

Each snow crystal forms when water vapor in the clouds condenses into ice.

The extremely low temperatures and rapid freezing were crucial to forming cubic ice, Wyslouzil said: «Since liquid water drops in high - altitude clouds are typically supercooled, there is a good chance for cubic ice to form there.»

«This imaging was part of an experiment checking the opacity of the atmosphere at night in Curiosity's location on Mars, where water - ice clouds and hazes develop during this season,» said camera team member Mark Lemmon of Texas A&M University, College Station.

Researchers created ice crystals with a near - perfect cubic arrangement of water molecules, in order to better understand how high - altitude ice clouds interact with sunlight and the atmosphere.

Many clouds at mid-latitudes make rain by freezing water into ice crystals (which fall from the cloud then melt before they hit the ground), rather than by coalescing warm water droplets together.

Water vapor and clouds may play a role The Arctic's summer ice cover hit a record low in 2007, when it dipped about 40 percent below the average ice cover recorded since 1979, when scientists began monitoring the region with satellites.

Among the findings is strong evidence for the existence of clouds of water or water ice, the first such clouds detected outside of our solar system.

The conclusion that limiting CO2 below 450 ppm will prevent warming beyond two degrees C is based on a conservative definition of climate sensitivity that considers only the so - called fast feedbacks in the climate system, such as changes in clouds, water vapor and melting sea ice.

Effects of plasma channels on ice formation or precipitation processes could not be proved in typical storm clouds, where ice crystals and subcooled water droplets coexist.

A cloud front can be seen in the lower left, and dark areas indicate regions of open water between sea ice formations.

«Our analysis confirmed that the Planck Response plays a dominant role in restoring global temperature stability, but to our surprise we found that it tends to be overwhelmed locally by heat - trapping positive energy feedbacks related to changes in clouds, water vapor, and snow and ice,» Brown said.

Given what scientists know about the Red Planet's atmosphere, these clouds likely consist of either carbon dioxide or water - based ice crystals.

By analyzing this data over the following six months, the researchers found that clouds that grew at the lowest temperatures required extremely high relative humidity in order for water vapor to form an ice crystal around a dust particle.

Hence, the clouds that form at colder temperatures — if any form at all — contain much less suspended water in the form of ice crystals, the starting sites for snow crystal formation.

Once those silver iodide particles make their way into a ripe cloud, they collide with drops of supercooled water and form ice; the ice then falls to the ground, melting along the way.

Even models that correctly capture cloud behavior may fail to fully account for other climate feedbacks from factors like changing snow and sea ice cover, atmospheric water vapor content, and temperature.

«A sort of grand problem in Earth science is to understand the water cycle — evaporation from the ocean, clouds, rain, the formation of ice, the runoff from the land back into the sea,» said Eric Lindstrom, Aquarius program scientist at NASA.

In addition, he says, since CFCs are not particularly soluble in water, they would not be present in cloud - born ice particles in very high concentrations, so the mechanism Lu and Sanche propose would not dissociate enough CFCs to have a big impact on ozone levels.

The coldest clouds are full of ice; the warmest are full of water.

The mountains are made primarily of rock - hard water ice; the dunes are most likely ice granules coated with hydrocarbons; volcanoes probably belch methane and ammonia, and methane fills the lakes, evaporates to form clouds, and rains back down to carve out river channels.

«Lightning is caused by charge separation within clouds, and to maximize charge separation, you have to loft more water vapor and heavy ice particles into the atmosphere,» he said.

«When carbon dioxide concentrations and temperatures rise, then mixed - phase clouds will increase their liquid water content,» said Ivy Tan, a PhD candidate at Yale University who led the research, which investigated common clouds that contain both ice and water.

As a result of atmospheric patterns that both warmed the air and reduced cloud cover as well as increased residual heat in newly exposed ocean waters, such melting helped open the fabled Northwest Passage for the first time [see photo] this summer and presaged tough times for polar bears and other Arctic animals that rely on sea ice to survive, according to the U.S. Geological Survey.

They pointed a variety of infrared telescopes at interstellar dust clouds and discovered dips at specific frequencies corresponding to molecules including methanol, ammonia, and water ice.

That includes mixedphase clouds, which occur in polar regions and combine supercooled water with ice.

The «factors» are natural phenomena such as water vapor, clouds, sea ice, dust and vegetation — all of which exert varying pulls on the climate.

That rover has stayed close to one spot for the last nine months, where among other observations, it spotted the first water - ice clouds identified from the surface of Mars.

In the latter scenario, water ice would make up 22 percent of the cloud head and ammonia ice 55 percent.

The key finding: cloud particles at the top of the great storm are composed of a mix of three substances: water ice, ammonia ice, and an uncertain third constituent that is possibly ammonium hydrosulfide.

The interesting effect, he notes, is that in Saturn's massive storm, at least, the observations can be matched by having particles of mixed composition, or clouds of water ice existing side - by - side with clouds of ammonia ice.

At first, the gas and dust cloud is extremely cold and simple molecules such as carbon monoxide and water settle on the grains of dust and solidify into ice.

The presence of water ice, he says, supports the idea that Saturn's superstorms are powered by condensation of water and originate deep in the atmosphere, about 200 kilometers below the visible cloud deck.

Why it matters: Arctic mixed - phase clouds are complex because they consist of both ice and water.

The climate sensitivity classically defined is the response of global mean temperature to a forcing once all the «fast feedbacks» have occurred (atmospheric temperatures, clouds, water vapour, winds, snow, sea ice etc.), but before any of the «slow» feedbacks have kicked in (ice sheets, vegetation, carbon cycle etc.).

Of particular interest is a bright pit on the floor of crater Occator that exhibits probable sublimation of water ice, producing haze clouds inside the crater that appear and disappear with a diurnal rhythm.

«Probability density function,» a statistical representation of the likelihood of something occurring at any point in time, was used to examine cloud properties, including vertical motion, liquid and ice water content, and the conditions of cloud particle growth, including how ice crystals grow at the expense of liquid droplets.

Water droplets, ice crystals and water vapor are constantly changing and able to co-exist only when air in a cloud is constantly moWater droplets, ice crystals and water vapor are constantly changing and able to co-exist only when air in a cloud is constantly mowater vapor are constantly changing and able to co-exist only when air in a cloud is constantly moving.

The small amount of heat released when water vapor condenses on ice crystals in Arctic clouds, which contain both water and ice, determines the cloud's survival, according to scientists from Pacific Northwest National Laboratory and Environment Canada.

Mars Odyssey spotted vast tracts of water ice, and Mars Reconnaissance Orbiter saw «dry ice» snowflakes falling from clouds near the pole.

Results: A team led by Pacific Northwest National Laboratory (PNNL) researchers has presented two processes, or explanations, for how extra ice crystals form in mixed - phase clouds — clouds containing both water and ice — which are prevalent throughout the Arctic.

«This imaging was part of an experiment checking the opacity of the atmosphere at night in Curiosity's location on Mars, where water - ice clouds and hazes develop during this season,» Mark Lemmon of Texas A&M University and a member of the camera team, said in a statement.

Although droplets are thousands of times more numerous, previous studies have shown that adding even a small number of ice crystals to these clouds can lead to a fast dissipation of the cloud water.

The main mode, which is involved in the formation of ice crystals in mixed - phase clouds (clouds formed by ice particles and water droplets), is the immersion freezing mode.

In one sentence: Researchers at Pacific Northwest National Laboratory found that when miniscule particles of airborne dust, thought to be a perfect landing site for water vapor, are modified by pollution, they change cloud properties via ice crystal number concentration and ice water content.

The study, published in the Journal of Geophysical Research, shows how a few ice crystals can overcome numerous water droplets in a heated battle for vapor within cold clouds.