Sentences with phrase «of orbital changes»

The albedo and CO2 feedbacks amplified weak orbital forcings, the feedbacks necessarily changing slowly over millennia, at the pace of orbital changes.

This positive feedback is necessary to trigger the shifts between glacials and interglacials as the effect of orbital changes is too weak to cause such variation.

Finding a similar trend in the Southern Hemisphere was somewhat unexpected because the effects of the orbital changes should be opposite there.

The resulting increased / decreased ice is amplified by «various feedbacks, including ice - albedo, dust, vegetation and, of course, the carbon cycle which amplify the direct effects of the orbital changes.»

The albedo and CO2 feedbacks amplified weak orbital forcings, the feedbacks necessarily changing slowly over millennia, at the pace of orbital changes.

Not exact matches

Earlier studies on the sensitivity of tropical cyclones to past climates have only analyzed the effect of changes in the solar radiation from orbital forcing on the formation of tropical cyclones, without considering the feedbacks associated to the consequent greening of the Sahara.

The researchers» interpretation is that the jet is «serpentine and inhomogeneous» because it emits radiation over a range of frequencies and from different zones, which change their orientation due to the instabilities in the jet, or to orbital motions.

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.

That phase difference from one side of the tip to the other makes the current running through the tip sensitive to changes in the phase of the orbital of the molecule below, too.

Holman says the changes in the transit times of these planets were enhanced by the fact that one of the planets orbits the star in almost exactly half of the time that it takes the other, as such «orbital resonances» increase their gravitational interaction.

The Arctic took another 3,000 - 4,000 years to warm this much, primarily because of the fact that the Northern Hemisphere had huge ice sheets to buffer warming, and the fact that changes in ocean currents and Earth's orbital configuration accelerated warming in the south.

But only the lucky binaries seem to have planets that orbit them; some stellar binaries that lack orbiting bodies have a different third party — a distant star that's so massive, its gravitational fluxes actually change the orbit of the stellar binary, causing the two stars to shrink together in a process called orbital decay.

«We know that the only thing changing in the Northern Hemisphere [20,000 years ago] were these orbital changes» that affect the amount of sunlight striking the far north, explains geologist Peter Clark of Oregon State University, who guided Shakun's research.

In particular, there was no sign of climate change in Indonesia associated with Earth's orbital precession, a wobble caused by Earth's axis tilt that generates differences in sunlight in a 21,000 - year cycle.

Since the rotation axis of Saturn inclines compared to its orbital plane around the Sun, the ring opening angle to the Sun changes over a 15 - year cycle.

The effect of these small orbital changes was amplified by positive feedbacks, such as changes in greenhouse gas levels.

The answer, according to theorists, is planetary migration: dramatic orbital changes due to the gravitational interaction of the young giant planet with the remains of the disk, or mutual interactions between planets.

John Freeland of the Advanced Photon Source, a DOE Office of Science User Facility at Argonne National Laboratory, contributed soft X-ray absorption spectroscopy, a technique for understanding orbital structure changes, and related data analysis.

The double pulsar PSR J0737 — 3039A / B consists of two neutron stars in a highly relativistic orbit that displays a roughly 30 - second eclipse when pulsar A passes behind pulsar B. Describing this eclipse of pulsar A as due to absorption occurring in the magnetosphere of pulsar B, we successfully used a simple geometric model to characterize the observed changing eclipse morphology and to measure the relativistic precession of pulsar B's spin axis around the total orbital angular momentum.

The same kick can change the alignment of smaller black holes and rock their orbital plane.

Scientists knew about the warming effects of greenhouse gases, but proponents of global cooling argued that greenhouse warming would be more than offset by Earth's orbital changes.

In the study, researchers analyzed a series of transient Coupled General Circulation Model simulations forced by changes in greenhouse gases, orbital forcing, meltwater discharge and the ice - sheet history throughout the past 21,000 years.

I'm curious, if the mid-holocene event resulted from solar activity, rather than orbital effects, would the resolution of our paleoclimate data really be high enough to determine whether or not these changes were as rapid as the changes we're seeing today?

This may help explain some of the changes that are not explained by the orbital curves in the other thread, especially the initiation of warming and cooling since the GCR effects can be much more powerful (partly forcing as postulated in the paper, but also amplification of the weaker orbital forcing).

Another provocative paper, well worth reading, is by Carl Wunsch and attempts to uage the contribution of orbital variations to climate change:

Expedition 54 Commander Alexander Misurkin handed over control of the orbital laboratory today to fellow cosmonaut Anton Shkaplerov during a traditional Change of Command ceremony.

Starting from the Earth's orbital speed of 30 kilometers per second (km / s), the change in velocity (delta - v) the spacecraft must make to enter into a Hohmann transfer orbit that passes near Mercury is large compared to other planetary missions.

Led by Lars A. Buchhave, from CfA, the study shows a connection between the orbital period of the planet and its size as it changes from a rocky planet to a gas giant.

Periods of volcanism can cool the climate (as with the 1991 Pinatubo eruption), methane emissions from increased biological activity can warm the climate, and slight changes in solar output and orbital variations can all have climate effects which are much shorter in duration than the ice age cycles, ranging from less than a decade to a thousand years in duration (the Younger Dryas).

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.

Sections 6.4 and 6.5 describe some aspects of the state - of - the - art understanding of the relationships between orbital forcing, climate feedbacks and past climate changes.

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).

Moreover, it offers a better understanding of the link between orbital variations and climate change over geologic time scales.

Predicted changes in orbital forcing suggest that the next glacial period would begin at least 50,000 years from now, even in absence of human - made global warming (see Milankovitch cycles).

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.

In particular, during the last 800,000 years, the dominant period of glacial — interglacial oscillation has been 100,000 years, which corresponds to changes in Earth's eccentricity and orbital inclination.

The consensus is that several factors are important: atmospheric composition (the concentrations of carbon dioxide, methane); changes in the Earth's orbit around the Sun known as Milankovitch cycles (and possibly the Sun's orbit around the galaxy); the motion of tectonic plates resulting in changes in the relative location and amount of continental and oceanic crust on the Earth's surface, which could affect wind and ocean currents; variations in solar output; the orbital dynamics of the Earth - Moon system; and the impact of relatively large meteorites, and volcanism including eruptions of supervolcanoes.

As I understand it, they are more or less trying to equate the 0.8 C per 1 W / m ^ 2 needed for a 3C rise from 2xCO2 (0.8 x 3.7 = 3C) to the +7 W / m ^ 2 of net incident solar from the orbital change that ultimately resulted in about an increase of 5 - 6C from the LGM to the current interglacial period (0.8 x 7 = 5.6 C).

Orbital factors can initiate, but the insolation rate of change due to orbital factors would not drive the detailed processes at a centennial scale (Dansgaard Oeschger etc).

Isotopious @ 43 — It is generally agreed that orbital forcing [at high northern latitudes] is the cause of the changes between the three states of interglacial / interstade (mild glacial) / stade (full glacial).

So here's an attempt: When temperatures change because of an orbital forcing, you've got a strong CO2 feedback because the CO2 in the atmosphere was in equilibrium with the CO2 in the oceans before temperatures changed.

The range of orientations that lead to transits falls off as orbital distances grow: Small changes in the angle of the planet's orbit become large changes in the apparent position of the planet and star, precluding a transit.

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»).

However, such an impact would not have changed the orbital planes of Uranus» larger moons, which are also «tipped over.»

The major mid-Holocene forcing relative to the present was due to orbital perturbations that led to large changes in the seasonal cycle of insolation.

These orbital variations, which can be calculated from astronomical laws (Berger, 1978), force climate variations by changing the seasonal and latitudinal distribution of solar radiation (Chapter 6).

Deep - sea cores show a dominating influence from 100,000 - year Milankovitch orbital changes, emphasizing the role of feedbacks.

Since it is the outermost orbital electrons of atoms that determine the physical properties of matter, the missing electron causes dramatic changes in the physical properties.

Students can begin by viewing how the Sun impacts the Earth, and then change the mass of the Sun and Earth separately to see how even small changes can greatly affect orbital patterns.

You can also change the camera view of the table, from dynamic and orbital (which follows the players one by one), and when you want to check your hole cards, they lift up in a satisfying «peel» motion.