Sentences with phrase «orbital parameters of»

The Milankovich cycles (variations in orbital parameters of the Earth) regulate the ice ages («pacemakers» Imbrie called them) by controlling insolation above 65 degrees N latitude.

If you have any means to access daily data it would be interesting to see, because crude monthly averages are a very poor way to analyse a system which is heavily influenced by a massive satellite with orbital parameters of 27.3 27.55 and 29.5 days!!

The last 10 in a row glacial cycles were paced by orbital parameters of gas giant planets.

It is believed that the PETM was likely initiated by changes of the orbital parameters of the Earth (eccentricity, obliquity and precession of axis) causing an increase in the intensity and distribution of solar radiation reaching the earth (Sexton et al, 2011).

«Step back and think about this: Small variations in the orbital parameters of the Earth — tilt and eccentricity and wobble — are recorded on the sea floor,» says Richard Katz, a geodynamicist at the University of Oxford in the United Kingdom and a co-author of the Science paper.

This clustering of orbital parameters of the most distant KBOs suggested a large, planetary size body shepherding their orbits.

Not exact matches

The now hyper - arid Sahara desert was characterized by a lush extent of grass and consequently reduced dust emission due to changes in Earth's orbital parameters.

Now it's been confirmed after more observations that reduced the number of errors in the orbital parameters.

Kane and his colleagues were able to confirm its extreme eccentricity and the rest of its orbital parameters as part of the Transit Ephemeris Refinement and Monitoring Survey (TERMS), a project led by Kane to detect extrasolar planets as they pass in front of their stars.

Kepler, which will keep a continuous watch on a patch of stars for more than three years, is better suited to finding planets like our own in terms of orbital periods as well as other parameters, although it will likely be a few years before it moves from the hot objects it has already discovered to cooler, potentially habitable worlds, whose transits are subtler and less frequent.

Transits, though subtle and brief, carry a great deal of information about a planet: the amount of dimming conveys the diameter of the planet, and the frequency of transits provides the planet's orbital parameters.

Through ACCESS, we are compiling a library of exoplanet transmission spectra, which will ultimately enable us and the wider exoplanet atmosphere community to study trends in the atmospheric properties of exoplanets as they relate to the exoplanets» masses, radii, and orbital parameters.

We developed a MC simulation tool to predict the outcome of a given survey, depending on the shape of the orbital parameter distributions.

Studies of the link between orbital parameters and past climate changes include spectral analysis of palaeoclimatic records and the identification of orbital periodicities; precise dating of specific climatic transitions; and modelling of the climate response to orbital forcing, which highlights the role of climatic and biogeochemical feedbacks.

Natural global warming is self - rectifying either by slow chemical weathering processes responsible for mineral sequestration of carbon or by gradual return of Earth's orbital parameters to what they were before the onset of global warming, thereby significantly reducing the amount of solar radiation reaching the Earth's surface.

«What we show in our paper is that we escaped the glacial inception naturally, thanks to a proper combination of Earth's orbital parameters and natural CO2 concentration.»

While Milankovitch forcing predicts that cyclic changes in the Earth's orbital parameters can be expressed in the glaciation record, additional explanations are necessary to explain which cycles are observed to be most important in the timing of glacial — interglacial periods.

«Our predictions indicate that the presence (or absence) of tidally driven fractures could be used to constrain Charon's internal structure and orbital parameters at the time of fracture formation.

Using multi-epoch optical and near - IR follow - up spectroscopy with FLAMES on the Very Large Telescope and ISIS on the William Herschel Telescope we obtain a full orbital solution and derive the fundamental parameters of both stars by modelling the light curve and radial velocity data.

The power law model population is dependent on four key parameters: How fast the number of planets changes with planet mass, how fast the number of planets changes with orbital distance, the outer-most orbital distance at which a planet can be detected, and the combination of mass and orbital distance that produces the most planets (the «pivot point»).

«A planet is a sub-stellar mass body that has never undergone nuclear fusion and that has sufficient self - gravitation to assume a spheroidal shape adequately described by a triaxial ellipsoid regardless of its orbital parameters,» the proposal said.

We also assess possible orbital parameters for each of the four planets independently.

The two objects [Sedna and 2012 VP113] have similar values for one of their orbital parameters: the angle [w] between the point of perihelion and where the orbit crosses the plane of the Solar System [from south to north].

Indian scientists made direct contributions — ranging from designing algorithms used to analyse signals registered by detectors to ascertain those from a gravitational wave to working out parameters like estimating energy and power radiated during merger, orbital eccentricity and estimating the mass and spin of the final black hole and so on.

About 70 % of the planet candidates in the CoRoT IRa01 field are best fit with an impact parameter of b > 0.85, while less than 15 % are expected in this range considering random orbital inclinations.

The response of that model to volcanic forcings, the last ice age, changes in orbital parameters etc. are all «out - of - sample» tests that are not fixed by adjusting parameters.

Recent modelling work provides strong support for the important role of variations in the Earth's orbital parameters in generating long - term climate variability.

Interesting — I just (last night) emailed [email protected], offering to become involved here, and mentioned the conclusion of the Loutre and Berger paper, that orbital forcing parameters will next be conducive to widespread polar ice accumulation in about 60,000 years.

However, which of the orbital parameters is the primary driver of glacial - interglacial cycles remains debated.

Just a quick note to say that the paleoclimate data for earlier warm periods 125,000 years ago and even 8 - 10,000 years ago in northern Alaska (paleoclimate warmer than now, [from] different forcings) document the northward advance of the treeline from Nome to Barrow, Alaska, and the Canadian border at different times of change in Earth's orbital parameters (without a significant change in CO2).

Natural global warming is self - rectifying either by slow chemical weathering processes responsible for mineral sequestration of carbon or by gradual return of Earth's orbital parameters to what they were before the onset of global warming, thereby significantly reducing the amount of solar radiation reaching the Earth's surface.

Forcings include the energy from the Sun, various orbital parameters, the period of rotation, and the like.

Short term solar cycles of the 27 day rotation periods, due to the polarity shifts in magnetic flux changes in the solar wind, The moon has a North / South declinational component as part of it's set of orbital parameters.

The current understanding of those cycles is that changes in orbital parameters (the Milankovich and other cycles) caused greater amounts of summer sunlight to fall in the northern hemisphere.

In the case of the 100 kyr ice age cycles, that forcing is high northern latitude summer insolation driven by predictable changes in Earth's orbital and rotational parameters — aka, Milankovitch theory — which has the intial effect of melting glaciers, thereby reducing albedo at those latitudes.

But there will be perturbations, which probably account for the gradual synchronisation of the Moon's orbital parameters with other solar system frequencies.

Some climate models of the Last Interglacial suggest that a high - index state of the North Atlantic Oscillation (NAO) was favoured due to the configuration of orbital parameters.

Regular variation in the Earth's orbital parameters has been identified as the pacemaker of climate change on the glacial to interglacial time scale (see Berger, 1988 for a review).

The INITIAL cause of the warming was a change in orbital parameters.

Over several centuries, it may be possible to observe the effect of these orbital parameters, however for the prediction of climate change in the 21st century, these changes will be far less important than radiative forcing from greenhouse gases.»

However, climates at high latitude are known to be very sensitive to orbital parameters affecting insolation (Ravelo et al., 2004), and thus proxy estimates with uncertain age constraints are not directly comparable to model simulations that typically span hundreds of years.

See: http://en.wikipedia.org/wiki/File:SummerSolstice65N-future.png Summary «Past and future of daily average insolation at top of the atmosphere on the day of the summer solstice, at 65 N latitude as derived from orbital parameters http://aom.giss.nasa.gov/srorbpar.html.