Sentences with phrase «cycle variation»

But there is no indication that solar cycle variations could explain the ongoing warming trend.

But there is no indication that solar cycle variations could explain the ongoing warming trend.

Soukharev, B. E. & Hood, L. L. Solar cycle variation of stratospheric ozone: Multiple regression analysis of long - term satellite data sets and comparisons with models.

«Changes in solar ultraviolet spectral irradiance directly modify the production rate of ozone in the upper stratosphere (e.g. Brasseur, 1993), and hence it is reasonable to expect a solar cycle variation in ozone amount.

«Menstrual cycle variation in hormones is one piece in the overall picture of sleep quality in midlife women,» Baker said.

«But when we consider that phase cycle variations can be up to 100,000 times fainter than the host star, these detections become truly astonishing.»

Since the observed Schwabe cycle variations are small, eleven - year periods frequently found in climate data are often ascribed instead to hypothesized oscillations in the atmosphere or oceans, internal to the climate system.

Hence, a reconstruction based solely on the sunspot number may underestimate the solar activity during the Maunder minimum.Therefore, we used in our reconstruction the solar modulation potential to calculate the long - term variations and the sunspot number to superpose them with the 11 - year cycle variations (see Appendix A).

Machado, L.A.T., W.B. Rossow, R.L. Guedes, and A.W. Walker, 1998: Life cycle variations of mesoscale convective systems over the Americas.

We find that most of the solar cycle variation in the total solar irradiance can be accounted for by the absolute magnetic field strength on the solar disk, if fields associated with dark and bright regions are considered separately.

Veizer fails to discuss the key issue (namely, whether the data support the idea that the warming trend, rather than just the temporary dip, could be explained by solar cycle variations).

Veizer must be aware that in view of these more recent data, the scientist who originally proposed this correlation in 1991, Knud Lassen, has concluded in 2000 that solar cycle variations can not explain the ongoing warming trend [1].

The results show that the optimized system has a low variability of about 5 % (0.5 mm) to cycle - to - cycle variations of 50 % in the in - cylinder gas force.

A team at the University of Waterloo has developed a novel variable valve actuation (VVA) system, optimized to pursue minimum energy consumption and minimum sensitivity of the valve lift to cycle - to - cycle variations of engine pressure.

References about solar - cycle variations of nitrates and hydrogen peroxide * Bradley R.S., 1985: Quaternary Paleoclimatology.

Veizer must be aware that in view of these more recent data, the scientist who originally proposed this correlation in 1991, Knud Lassen, has concluded in 2000 that solar cycle variations can not explain the ongoing warming trend [1].

Thus, solar cycle variations may or may not explain this «dip» (one similar - looking dip in two curves is not a significant correlation and could easily be coincidence; there is a better - founded explanation for this «dip» resulting from cooling by aerosol emissions — see the figure from Hansen et al. coming up below).

Veizer fails to discuss the key issue (namely, whether the data support the idea that the warming trend, rather than just the temporary dip, could be explained by solar cycle variations).

However, the presence of orbital - cycle variations has (time and again) been confirmed in records which are not orbitally tuned (see e.g. Huybers, P. 2007.

So, the most which can be said is that just the correlation between the solar - cycle variations in the GCR and cloud cover is not sufficient to prove that the physical link is necessarily real, but it certainly can not be used to refute it.

Prior to this period, the two curves appear not to show similar solar cycle variations, which is likely due to regional climatic effects (Usoskin et al. 2009) leading to strong fluctuations of the 10Be deposition (Pedro et al. 2006, 2011).

It is intriguing to extrapolate these results to longer term solar irradiance changes, which are roughly two to three times larger than solar cycle variations.