Sentences with phrase «with changing solar activity»

New data have more accurately quantifi ed changes in solar spectral fl uxes over a broad range of wavelengths in association with changing solar activity.

New data have more accurately quantifi ed changes in solar spectral fl uxes over a broad range of wavelengths in association with changing solar activity.

Not exact matches

The team attempted to develop an explanation for the anomalous solar activity data by comparing the features of the 14C change with those of other solar events known to have occurred over the last couple of millennia.

The consortium instruments are designed to study a number of phenomena, including the interaction of 67P / C - G with the solar wind, a continuous stream of plasma emitted by the sun; changes of activity on the comet; the structure and dynamics of the comet's tenuous plasma atmosphere, known as the coma; and the physical properties of the comet's nucleus and surface.

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).

... The [NAO proxy record] shows distinct co-variability with climate changes over Greenland, solar activity and Northern Hemisphere glacier dynamics as well as climatically associated paleo - demographic trends.

Thus it appears that, provided further satellite cloud data confirms the cosmic ray flux low cloud seeding hypothesis, and no other factors were involved over the past 150 years (e.g., variability of other cloud layers) then there is a potential for solar activity induced changes in cloudiness and irradiance to account for a significant part of the global warming experienced during the 20th century, with the possible exception of the last two decades.

Heliophysics encompasses cosmic rays and particle acceleration, space weather and radiation, dust and magnetic reconnection, solar activity and stellar cycles, aeronomy and space plasmas, magnetic fields and global change, and the interactions of the solar system with our galaxy.»

The paper he wrote together with Friis - Christensen in which he found a correlation between solar activity and clouds had a «slight» flaw: it ignored that the period of the study coincided with a big El Nino, and that large scale changes in ocean surface temperature are going to have an effect on cloud formation.

Solar cycle length Veizer suggests the recent global warming might be driven by changes in solar activity (his Fig. 14a — dashed line is temperature, solid line with diamonds is solar cycle lenSolar cycle length Veizer suggests the recent global warming might be driven by changes in solar activity (his Fig. 14a — dashed line is temperature, solid line with diamonds is solar cycle lensolar activity (his Fig. 14a — dashed line is temperature, solid line with diamonds is solar cycle lensolar cycle length).

In particular, the authors find fault with IPCC's conclusions relating to human activities being the primary cause of recent global warming, claiming, contrary to significant evidence that they tend to ignore, that the comparatively small influences of natural changes in solar radiation are dominating the influences of the much larger effects of changes in the atmospheric greenhouse gas concentrations on the global energy balance.

Yet while the dips in solar activity correlate well with the LIA, there are other factors that, in combination, may have contributed to the climate change:

Past climate swings (some much larger than the current warming) correlate well with changes in solar activity, but these can not be accounted for just with TSI.

It is not the change in solar activity that counts, Vaughan (as it is with CO2); it is the absolute level.

Another new study finds that solar activity correlates with temp and climate change.

The coldest periods of the LIA (about 1 degC of cooling) appear to associated with reduced solar activity, but published estimates of the change in TSI (1 W / m2) appear to be far too small to have produced the observed cooling.

http://www.vukcevic.talktalk.net/NFC1.htm http://www.vukcevic.talktalk.net/LFC20.htm Re UV: This is a copy of a note I wrote some 5 - 6 years ago with minor changes (I occasionally quote it here and there since I think it still has some merit) Both UV and the particle radiation (particle radiation is a function of solar activity and the strength of Van Allen belt, via the Earth's field strength) could have far larger indirect contribution by controlling plankton volumes, and in turn changing the oceans» clarity and CO2 absorption.

The second would lead us to believe that solar activity and cyclical changes in ocean current systems are the primary drivers with CO2 at best a bit player.

It has been established experimentally that, at ca 4.0 ka BP, there occurred a global change in the structure of atmospheric circulation, which coincided in time with the discharge of glacial masses from Greenland to North Atlantic and a solar activity minimum.

If I can prove that solar activity is modulated by the motion of the solar system masses and their associated fields, we will be able to accurately hindcast solar activity and get a better idea of its correlation with climate changes.

In fact, climate change cycles correlate with solar activity, the expert continued.

One of the first «out» climate skeptics was an Australian named John Daly — who believed, probably correctly, that climate change has a lot more to do with solar activity and multi-decadal cycles than with CO2 — and maintained a blog which became a magnet for the climate resistance.

Earth's geological changes correlates with solar activity http://www.vukcevic.talktalk.net/SSN-NAP.htm 3.

You have not cited a third possibility (out of the infinite range of possibilities), no climate change associated with CO2 (due to, for example, cloud cover providing negative feedback), with current increase due to natural variability; or how about possibility four, that increase in CO2 concentrations are caused by the temperature rise, which is in turn caused by (for example) increased solar activity resulting in increased biomass activity etc. etc..

Leif Svalgaard's argument, as I understand it, is that with the most recent and reliable reconstructions of the history of solar activity, temperature change and solar activity are almost perfectly uncorrelated over a time span of 300 years, and the association apparent in Alec Rawls» graph only appears in the 20th century.

«Since irradiance variations are apparently minimal, changes in the Earth's climate that seem to be associated with changes in the level of solar activity — the Maunder Minimum and the Little Ice age for example — would then seem to be due to terrestrial responses to more subtle changes in the Sun's spectrum of radiative output.

A shift in atmospheric circulation in response to changes in solar activity is broadly consistent with atmospheric circulation patterns in long - term climate model simulations, and in reanalysis data that assimilate observations from recent solar minima into a climate model.

The authors found that consistent with previous research, changes in solar and volcanic activity, land cover, and incoming solar radiation due to the Earth's orbital cycles were the main contributors to the cooling between the MWP and LIA (the years 900 — 1600), and probably also caused the cooling over the full 2,000 - year period.

The climate shift of 1978 manifests as a strong lift in 200hPa temperature globally with the most extreme change at about 30 ° of latitude in both hemispheres, a pronounced fall in sea level pressure in the south East Pacific, a jump in sea surface temperature in the tropics, the transition between solar cycle 20 and 21 and a hike in the aa index of geomagnetic activity that has slowly sunk along with 200hpa temperature from that time forward.

Compared with natural factors that influence climate (including solar variation and volcanic eruptions), human activities — primarily burning fossil fuels and deforestation — have been a major contributor to climate change over the last 50 years.

«There's that odd cyclical behavior in Holgate's sea level change rate plots, which looks remarkably like it's in phase with solar activity.»

The change in trend coincided with the declining levels of solar activity after the peak of solar cycle 23.

The Lunar tidal effects act in concert with the changes in the overall level of solar activity and so appear to «amplify» the changes caused by the Sun.

We checked this assumption by comparing TEC obtained at three selected sites in Europe (cf. http://swaciweb.dlr.de) with the solar activity dynamics represented by the radio flux index F10.7 which is also a proxy for EUV radiation changes (see Fig. 6).

Whereas CO2 concentration is quasi-steadily increasing, other drivers change their trends with time even to opposite (solar and geomagnetic activity, stratospheric ozone), or change trends with location (Earth's main magnetic field), or with latitude (geomagnetic activity), or are largely unknown but probably unstable in space and time (atmospheric winds and waves).

The BEST team found that greenhouse gases and volcanic eruptions could account for most of the observed temperature change, and suggest that the remainder of the variability is fairly consistent with the Atlantic Multidecadal Oscillation (AMO), an ocean cycle, and very little contribution from changes in solar activity (Figure 2).

Since the solar EUV radiation varies by a factor of about 2 within a solar cycle (Lean et al. 2003), it is expected that the ionospheric TEC is highly correlated with solar activity changes.

Section 1 contains five subsections with results on 27 - day response of low - latitude ionosphere to solar extreme - ultraviolet (EUV) radiation, response to the recurrent geomagnetic storms, long - term trends in the upper atmosphere, latitudinal dependence of total electron content on EUV changes, and statistical analysis of ionospheric behavior during prolonged period of solar activity.

Jakowski et al. (2011) reveal in Section 2.4 the coherent variations of TEC with F10.7 at three selected latitudes during the last solar cycle and assess the changes of the large - scale horizontal gradients with solar activity.

This section includes results of the studies on ionospheric response to periodic changes of solar activity connected with solar rotation and also on long - term trends, connected with changes during solar cycle.

The methods of Black Box Model Identification applied to an energy balance model provide directly the so called «equilibrium sensitivities» with respect to three inputs: CO2; solar and volcanic activities; this is shown by Prof. de Larminat in his book «Climate Change: Identifications and projections «[77] where Identification techniques well known in industrial processes, are applied to 16 combinations of historical reconstructions of temperatures (Moberg, Loehle, Ljungqvist, Jones & Mann) and of solar activity proxies (Usoskin - Lean, Usoskin - timv, Be10 - Lean, Be10 - timv) for the last millennium, with some series going back to year 843.

My argument was not that the barycentric speed of the sun was «directly» responsible of the climate oscillations As I read your paper [and other papers of yours] you say that solar activity is directly responsible for climate changes [with the exception of the most recent changes that you now say mostly is AGW.

The catch is the degree of magnitude change and duration of time of the solar variations must reach certain LEVELS in order to overcome the inherent negative feedbacks in earth's climatic system, along with natural earth bound random climate events (examples enso, volcanic activity).

5) In all cases a decadal or longer decrease in solar activity is associated with a decrease in temperatures and a change in precipitation patterns.

Precession / obliquity — Precession very favorable while obliquity is lessening and becoming more favorable as compared to the Holocene Optimum period of time and this is why I think the global temperatures in general have been on a decline overall since the Holocene optimum however with fits and starts due to solar activity changes / volcanic activity and enso superimposed upon this general trend.

http://www.agci.org/docs/lean.pdf «Global (and regional) surface temperature fluctuations in the past 120 years reflect, as in the space era, a combination of solar, volcanic, ENSO, and anthropogenic influences, with relative contributions shown in Figure 6.22 The adopted solar brightness changes in this scenario are based on a solar surface flux transport model; although long - term changes are «50 % larger than the 11 - year irradiance cycle, they are significantly smaller than the original estimates based on variations in Sun - like stars and geomagnetic activity.

As a consequence of the ozone changes, radiative forcing of surface climate is out of phase with solar activity.

If so, how does the current statement of «solar activity leading to cooling» reconcile with the previous description of the last century's temperature changes as described in the original, 2008 article?

During the late 20th Century the El Ninos has a greater effect on the jet positioning than they do now and the only variable to have changed is the level of solar activity which appears to have coincided with a slight warming of the stratosphere (previously cooling) and an intensification of the inversion at the tropopause which then redirects more energy back downward in the polar high pressure cells.

«Comparing the changes in English temperatures (which the researchers say are representative of European temperatures as a whole) with fluctuations in solar activity, the researchers found a strong correlation.»