ライフサイエンスコーパス: obliquity

1 to reach Earth's climatically favourable low obliquity.

2 a combination of high eccentricity and high obliquity.

3 kyr and was related to variations in Earth's obliquity.

4 s, matching the period of changes in Earth's obliquity.

5 owfall during periods of increased spin-axis obliquity.

6 coplanar planets have been seen to have low obliquities.

7 are obtained noninvasively in a multitude of obliquities.

8 delta18O or sea level, leaving the in-phase obliquity (41,000 years) component of insolation to domi

9 bonate content carries the "polar" signal of obliquity [41,000 years (41 kyr)] forcing.

10 which consists of low-amplitude variance in obliquity (a node) and a minimum in eccentricity, result

11 inclinations are consistent with low orbital obliquity and a geocentric-axial-dipole magnetic field f

12 ution with the unexpected alignments of spin obliquity and correlations with spin rates presents a ne

13 nds with a rare orbital congruence involving obliquity and eccentricity.

14 f the Amazonian, suggesting generally higher obliquity and insolation conditions at the poles than at

15 The latter excursion is paced by obliquity and is therein similar to Mesozoic intervals o

16 ture extremes that result from Charon's high obliquity and long seasons in the production of this mat

17 summer insolation is primarily controlled by obliquity and not precession because, by Kepler's second

18 tate when its spin axis both tilts to a high obliquity and precesses to align the Northern Hemisphere

19 Here I show that both obliquity and precession pace late Pleistocene glacial c

20 nsoon is sensitive to orbital forcing at the obliquity and precession periods (41,000 and 23,000 year

21 Eccentricity, obliquity, and precession are cyclic parameters of the E

22 s inspired models that depend on the Earth's obliquity (approximately 40,000 yr; approximately 40 kyr

23 n in the Kepler-30 system suggests that high obliquities are confined to systems that experienced dis

24 d previously unconsidered tidal force due to obliquity (axial tilt of the moon with respect to its or

25 ed with greater mid-depth overturning in the obliquity band but less overturning in the precession ba

26 cession and approximately 124 degrees in the obliquity bands relative to the phase of maximum global

27 ty exhibits power in both the precession and obliquity bands, and is nearly in anti-phase with summer

28 This led to the amplification of obliquity (but not precession) cycles in equatorial sea

29 ness feedback could have reduced the Earth's obliquity by tens of degrees in less than 100 Myr if the

30 rs in diameter, potentially modified Earth's obliquity by ~10 degrees , whereas those for the Moon, a

31 that glacial terminations are independent of obliquity can be rejected at the 5% significance level,

32 veloping scoliosis and its associated pelvic obliquity can even compromise sitting.

33 However, the tilt of Mars' rotation axis (obliquity) changed considerably in the past several mill

34 on was influenced by combined precession and obliquity changes.

35 ice sheets terminated every second or third obliquity cycle at times of high obliquity, similar to t

36 ng is consistent with the periodicity of the obliquity cycle.

37 ses over 100-kyr eccentricity cycles, 41-kyr obliquity cycles and 23-kyr precession cycles.

38 erature records display much more pronounced obliquity cycles at a period of about 41 kyr.

39 hat both records are dominated by the 41-kyr obliquity cycles between 1.8 and 1.2 Myr ago, with a rel

40 ear eccentricity cycles and 1.2-million-year obliquity cycles in periodically recurring glacial and c

41 anged from 41 kyr, the period of the Earth's obliquity cycles, to 100 kyr, the period of the Earth's

42 , along with ice-albedo feedbacks, amplified obliquity cycles.

43 this would require a mechanism to bring the obliquity down to its present value of 23.5 degrees.

44 rbit around an initially fast-spinning, high-obliquity Earth, which is a probable outcome of giant im

45 We used asteroseismology to measure a large obliquity for Kepler-56, a red giant star hosting two tr

46 A high obliquity for the early Earth may also provide a natural

47 The obliquity forcing could be primarily delivered by a cros

48 Our finding suggests that the obliquity forcing may play a more important role in glob

49 cene glacial terminations purely in terms of obliquity forcing.

50 titude processes that were driven by orbital obliquity forcing.

51 ce volume changes at a dominant 41,000-year (obliquity) frequency throughout this time.

52 but was more abundant during periods of high obliquity in the last few millions of years.

53 ccentricity modulation, and amplification of obliquity, is nearly coincident with a 2% decrease in se

54 reated during the last phase of high orbital obliquity less than 100,000 years ago, and is now being

55 ost layers post-date the latest downtrend in obliquity <20,000 years ago.

56 61 ka, 52.5-50.5 ka and 37.5-33 ka that lead obliquity maxima and precession minima.

57 Episodic excursions to high obliquities may also have raised temperatures over some

58 Williams has suggested that the Earth's obliquity may have been greater than 54 degrees during m

59 precession maximum by ~3 ka, suggesting that obliquity may have played a considerable role in the Alp

60 bundle (n=1; 1.0%), as well as imaging plane obliquity (n=7; 12.5%).

61 Here we propose that obliquity-oblateness feedback could have reduced the Ear

62 be ruled out as the explanation for the high obliquities of hot Jupiters, and dynamical interactions

63 hat the planet occupies a Cassini state with obliquity of 2.11 +/- 0.1 arc minutes.

64 elaborated into hypotheses that precession, obliquity or combinations of both could pace deglaciatio

65 d by 'snowball Earth' episodes, high orbital obliquity or markedly non-uniformitarian geomagnetic fie

66 ximately million-year periodicities in Mars' obliquity or orbital eccentricity.

67 e dark layers and formed mainly during lower obliquity over the past 4-5 Myr.

68 rs are among the most sensitive recorders of obliquity-paced climate variability in interior Antarcti

69 The model accounts for the dominance of obliquity-paced glacial-interglacial cycles early in the

70 220 ka, at least, the changes are related to obliquity-paced solar radiation, manifest as variations

71 Earlier tests have shown that obliquity paces the late Pleistocene glacial cycles but

72 curred at Earth-like frequencies during high-obliquity periods in the last million years on Mars.

73 the 2.4 Myr eccentricity cycle, during which obliquity prevails over precession, and highlights the d

74 rbon cycling through the period and a strong obliquity signal.

75 This obliquity signature implies coincidence with a minimum o

76 nd or third obliquity cycle at times of high obliquity, similar to the original proposal by Milankovi

77 y of water ice and dust during variations in obliquity (the angle between Mars' pole of rotation and

78 eleased into the atmosphere at times of high obliquity, the CO(2) reservoir would increase the atmosp

79 ions were dictated by changes in the Earth's obliquity) to the more recent 100-kyr cycles of ice ages

80 we show that tidal dissipation due to lunar obliquity was an important effect during the Moon's tida

81 f Mars during periods of increased spin-axis obliquity when polar ice was mobilized and redeposited i

82 hot Jupiters are often observed to have high obliquities, whereas stars with multiple coplanar planet

83 oles to mid-latitudes during periods of high obliquity within the past 10(5) to 10(6) years.