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Post by sigurdur on Jan 4, 2020 19:15:30 GMT
Dr. Shaviv has an interesting hypothesis. Is his hypothesis more correct than CO2 enhanced warming?
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Post by sigurdur on Jan 4, 2020 20:17:10 GMT
Dr. Shaviv has an interesting hypothesis. Is his hypothesis more correct than CO2 enhanced warming? What is the hypothesis? When I get to my desktop I will post it. Was hoping someone would do that. |
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Post by acidohm on Jan 4, 2020 23:59:09 GMT
When I get to my desktop I will post it. Was hoping someone would do that. Does this help?? youtu.be/a--kc5dbvyQ |
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Post by missouriboy on Jan 5, 2020 3:34:45 GMT
Dr. Shaviv has an interesting hypothesis. Is his hypothesis more correct than CO2 enhanced warming? Sorry Sig. It won't pass muster in the halls of the social justice Queens. But I like it.  |
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Post by nautonnier on Jan 5, 2020 11:06:43 GMT
When I get to my desktop I will post it. Was hoping someone would do that. There is also this paper but it has been around for some time.. "The spiral structure of the Milky Way, cosmic rays, and ice age epochs on Earth
Nir J. Shaviva Racah Institute of Physics, Hebrew University,Jerusalem,
Received 28 January 2002; received in revised form 15 August 2002
Abstract
The short term variability of the galactic cosmic ray flux (CRF) reaching Earth has been previously associated with variations in the global low altitude cloud cover. This CRF variability arises from changes in the solar wind strength.However, cosmic ray variability also arises intrinsically from variable activity of and motion through the Milky Way. Thus,if indeed the CRF climate connection is real, the increased CRF witnessed while crossing the spiral arms could be responsible for a larger global cloud cover and a reduced temperature, thereby facilitating the occurrences of ice ages. This picture has been recently shown to be supported by various data [PhRvL 89 (2002) 051102]. In particular, the variable CRF recorded in Iron meteorites appears to vary synchronously with the appearance ice ages.Here, we expand upon the original treatment with a more thorough analysis and more supporting evidence. In particular,we discuss the cosmic ray diffusion model which considers the motion of the galactic spiral arms. We also elaborate on the structure and dynamics of the Milky Way’s spiral arms. In particular, we bring forth new argumentation using HI observations which imply that the galactic spiral arm pattern speed appears to be that which fits the glaciation period and the cosmic-ray flux record extracted from Iron meteorites. In addition, we show that apparent peaks in the star formation rate history, as deduced by several authors, coincides with particularly icy epochs, while the long period of 1 to 2 Gyr before present, during which no glaciations are known to have occurred, coincides with a significant paucity in the past star formation rate"old.phys.huji.ac.il/~shaviv/articles/long-ice.pdf |
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Post by sigurdur on Jan 5, 2020 18:26:23 GMT
Dr. Shaviv had dating problems in his original hypothesis. His last paper seems to have corrected this.
His timescale is galactic. Extrapolation to a shorter time scale may produce??
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Post by sigurdur on Jan 6, 2020 17:57:28 GMT
Does this support Dr. Shaviv's analysis? We conducted a high-resolution study of a unique Holocene sequence of wind-blown sediments and buried soils in Southern Siberia, far from marine environment influences. This was accomplished in order to assess the difference between North Atlantic marine and in-land climate variations. Relative wind strength was determined by grain size analyses of different stratigraphic units. Petromagnetic measurements were performed to provide a proxy for the relative extent of pedogenesis. An age model for the sections was built using the radiocarbon dating method. The windy periods are associated with the absence of soil formation and relatively low values of frequency dependence of magnetic susceptibility (FD), which appeared to be a valuable quantitative marker of pedogenic activity. These events correspond to colder intervals which registered reduced solar modulation and sun spot number. Events, where wind strength was lower, are characterized by soil formation with high FD values. Spectral analysis of our results demonstrates periodic changes of 1500, 1000 and 500 years of relatively warm and cold intervals during the Holocene of Siberia. We presume that the 1000 and 500 year climatic cycles are driven by increased solar insolation reaching the Earth surface and amplified by other still controversial mechanisms. The 1500 year cycle associated with the North Atlantic circulation appears only in the Late Holocene. Three time periods — 8400–9300 years BP, 3600–5100 years BP, and the last ~ 250 years BP — correspond to both the highest sun spot number and the most developed soil horizons in the studied sections. www.sciencedirect.com/science/article/pii/S0921818113000775 |
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Post by nautonnier on Jan 6, 2020 23:15:25 GMT
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Post by sigurdur on Jan 7, 2020 7:20:33 GMT
agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2016JA022689A method is developed to rank Forbush decreases (FDs) in the galactic cosmic ray radiation according to their expected impact on the ionization of the lower atmosphere. Then a Monte Carlo bootstrap‐based statistical test is formulated to estimate the significance of the apparent response in physical and microphysical cloud parameters to FDs. The test is subsequently applied to one ground‐based and three satellite‐based data sets. Responses (>95%) to FDs are found in the following parameters of the analyzed data sets. AERONET: Ångström exponent (cloud condensation nuclei changes), SSM/I: liquid water content, International Satellite Cloud Climate
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Post by sigurdur on Nov 29, 2020 0:59:40 GMT
One of the most famous climate oscillations has a period of about 60 years. Although this oscillation might emerge from internal variability, increasing evidence points toward a solar or astronomical origin, as also argued herein. We highlight that the orbital eccentricity of Jupiter presents prominent oscillations with a period of quasi 60 years due to its gravitational coupling with Saturn. This oscillation is found to be well correlated with quite a number of climatic records and also with a 60‐year oscillation present in long meteorite fall records relative to the periods 619–1943 CE. Since meteorite falls are the most macroscopic aspect of incoming space dust and their motion is mostly regulated by Jupiter, we propose that the interplanetary dust influx also presents a 60‐year cycle and could be forcing the climate to oscillate in a similar manner by modulating the formation of the clouds and, therefore, the Earth's albedo. agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2020GL089954 |
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