Articles Tagged "Joseph D’Aleo"

Sorted by: Date Posted | Views
Climatic Effects of Warming Due To Ultraviolet Chemistry by Joseph D'Aleo
Monday, June 7th 2010, 5:31 AM EDT
Co2sceptic (Site Admin)
Recent research by Robert Hodges and Jim Elsner of Florida State University (GRL June 2010) found the probability of three or more hurricanes hitting the United States goes up drastically during low points of the 11-year sunspot cycle related to reduced ultraviolet radiation during the quiet sun which leads to less warming of the upper atmosphere and thus greater instability of the atmosphere. Their work was published this month in the scientific journal Geophysical Research Letters (Elsner, J. B., T. H. Jagger, and R. E. Hodges (2010), Daily tropical cyclone intensity response to solar ultraviolet radiation, Geophys. Res. Lett., 37, L09701, doi:10.1029/2010GL043091).

For hurricanes to form, the atmosphere must cool fast enough, at the right heights, to make it unstable enough for storm clouds to form. This thunderstorm activity enables heat stored in the ocean to be unleashed, developing into tropical cyclones. As the “heat-engine theory” of hurricanes goes, storm strength decreases when the layer near the hurricane’s top warms.

The sun’s yearly average radiance during its 11-year cycle only changes about one-tenth of one percent, according to NASA’s Earth Observatory. But the warming in the ozone layer can be much more profound, because ozone absorbs ultraviolet radiation. Between the high and low of the sunspot cycle, radiation can vary more than 10 percent in parts of the ultraviolet range, Elsner has found [here]

Baldwin and Dunkerton (2004) had found similarly, although solar irradiance varies 0.1- 0.15 (this cycle) over the 11 year cycle, radiation at longer UV wavelengths increased by several (6-8% or more) percent with still larger changes (factor of two or more) at extremely short UV and X-ray wavelengths.

Energetic flares increase the UV radiation by 16%. Ozone in the stratosphere absorbs this excess energy and this heat has been shown to propagate downward and affect the general circulation in the troposphere.

Labitzke and Van Loon (1988) and later Labitzke in numerous papers has shown that high flux (which correlates very well with UV) produces a warming in low and middle latitudes in winter in the stratosphere with subsequent dynamical and radiative coupling to the troposphere. Shindell (1999) used a climate model that included ozone chemistry to reproduce this warming during high flux (high UV) years.

Image AttachmentNOAA SEC solar flux (10.7cm) during cycle 23. Note the second solar max with extremely high flux from September 2001 to April 2002.

Click PDF file from iceCap.us to read FULL report from Joseph D'Aleo
Source Link: icecap.us
Sun Run of 51 Days Without a Spot Now Among the Top 5 by Joseph D’Aleo
Sunday, August 30th 2009, 4:41 PM EDT
Co2sceptic (Site Admin)
Image AttachmentSunday, August 30th marks the 51st straight day without a sunspot, one of the longest stretches in a century. One more day and we have a spotless month (we had some by some accounts one last August but a few observatories thought they saw a spot on the sun for a few hours one day). It would be either the first or second spotless month since 1913 depending on whether you count last August as spotless.

In fact it rises into 4th place among all spotless periods since 1849 (first table here). Note: It is 5th place if you accept a spotless August 2008 which would have led to a stretch of 52 days. The total number of spotless days this transition from cycle 23 to 24 is now 704, exceeding the number for cycle 15 in the early 1900s (below).
Source Link: icecap.us
THIS ARTICLE CONTINUES
Warming May have Peaked. Has Western Civilization Peaked with It? by Joseph D’Aleo
Wednesday, August 26th 2009, 10:14 AM EDT
Co2sceptic (Site Admin)
article image
The only constant in nature is change. We have been able to reconstruct the past using proxy data like fossils, isotopes, polar and glacial ice. They tell us our climate has varied considerably over the last 450 thousand years. The long glaciations (typically 100,000 years) are tied to variations in the sun-earth orbital parameters. They are followed by periods of 10-15,000 years of warmer interglacials.
Source Link: icecap.us
THIS ARTICLE CONTINUES
Giv2.me - The Charity Donations Site
Sun Run of 41 Days Without a Spot Now Among the Top 10 Longest by Joseph D’Aleo (IceCap.US)
Friday, August 21st 2009, 9:14 AM EDT
Co2sceptic (Site Admin)
Image AttachmentToday, Thursday, August 20th marked the 41st straight day without a sunspot, one of the longest stretches this solar minimum.

In fact it rises into 10th place among all spotless periods since 1849 (first table here). The total number of spotless days this transition from cycle 23 to 24 is now 694 rapidly approaching the approximate number leading into cycle 15 in the early 1900s (below, enlarged here).
Source Link: icecap.us
THIS ARTICLE CONTINUES
Some Documented Solar Influences on Weather by Joe D'Aleo
Wednesday, July 15th 2009, 9:04 AM EDT
Co2sceptic (Site Admin)
In a number of posts this last year, we have addressed the unusually long and quiet solar cycles. A few weeks back, we noted the sunspot minimum seemed at hand as the month of June started with a series of cycle 24 sunspots and it appeared we would exceed the monthly sunspot number of 3.3 necessary to make the sunspot minimum (the lowest value in 13 month average) November 2008.

Well June despite numerous other small microdots characteristic of this cycle ended up with a monthly average of 2.6 which allowed December to drop from the 1.8 to 1.7 making December the earliest candidate for solar minimum. July would have to average below 3.5 in order for the minimum to move to January. It is unlikely to move to February as the month August would have to average below 0.5, the number in the month it will replace.

December had a 13 month average sunspot number of 1.7. Only three minima since 1750 had official minima below 1.7 (1913 1.5, 1810 0, 1823 0.1). Of course modern measurement technologies are better than older technologies so there is some uncertainty as to whether microdots back then would have been seen.
Source Link: intellicast.com
THIS ARTICLE CONTINUES
SUNSPOT MINIMUM AT HAND
Wednesday, June 3rd 2009, 6:50 PM EDT
Co2sceptic (Site Admin)
Image AttachmentThe sun has become more active in recent days with cycles 24 spots in middle latitudes. See sunspot group number 11019 for group of red spots. This is slightly diminished since yesterday. The dark green areas are coronal holes out of which the solar wind escapes at higher velocity.

Please click this link to read FULL report from IceCap.US
Source Link: icecap.us
16 articles found
showing page 2 of 2
« previous    1 2    next »
Articles by Climate Realists and Topics

» Recently used highlighted

ALL #-E F-J K-O P-T U-Z
Useful links
Disclaimer
  • » News articles may contain quotes, these are copyright to the respective publication which will be stated, along with a link to the source article where available.
  • » If you feel your copyright has been violated please contact us and the article will be removed or amended at your request.
Site Details
  • » Launched 15 May 2009
  • » Website Design by Mr Zippy
Climate Depot Feed
  • » Feed Error