Njar frttir af Svensmark tilrauninni hj CERN Sviss...

Flestir kannast vi kenningar danska vsindamannsins Dr. Henriks Svensmark prfessors varandi hugsanleg hrif geimgeisla skjafar og ar me hrif hitafar lofthjpsins. essi kenning hefur valdi nokkrum titringi vsindaheiminum. Hj rannsknarstofnuninni CERN eru menn fullu a undirba rndra tilraun ar sem reynt verur a komast a raun um hvort essi kenning eigi vi rk a styjast. Tilraunin kallast CLOUD (Clouds Leaving OUtdoor Droplets).

r frttir voru a berast a okuhylki stra ar sem hgt verur a lkja eftir astum lofthjpnum er komi. Lkt verur eftir geimgeislum me orkumiklum reindahrali. essi tmamt eru fangi eftir riggja ra rannsknar og runarstarf vi undirbning tilraunarinnar.

Sj frlega umfjllun um ennan fanga vefsu CERN: On Cloud nine. ar er m.a. sm vdklippa.

Fyrir feinum dgum hlt Jasper Kirkby hj CERN erindi. kynningu erindisins segir:

The current understanding of climate change in the industrial age is that it
is predominantly caused by anthropogenic greenhouse gases, with
relatively small natural contributions due to solar irradiance and volcanoes.
However, palaeoclimatic reconstructions show that the climate has
frequently varied on 100-year time scales during the Holocene (last 10 kyr)
by amounts comparable to the present warming - and yet the mechanism or
mechanisms are not understood. Some of these reconstructions show clear
associations with solar variability, which is recorded in the light
radio-isotope archives that measure past variations of cosmic ray intensity.
However, despite the increasing evidence of its importance, solar-climate
variability is likely to remain controversial until a physical mechanism is
established.


Estimated changes of solar irradiance on these time scales appear to be too
small to account for the climate observations. This raises the question of
whether cosmic rays may directly affect the climate, providing an effective
indirect solar forcing mechanism. Indeed recent satellite observations -
although disputed - suggest that cosmic rays may affect clouds. This talk
presents an overview of the palaeoclimatic evidence for solar/cosmic ray
forcing of the climate, and reviews the possible physical mechanisms.
These will be investigated in the CLOUD experiment which begins to take
data at the CERN PS later this year.


Glrur sem Kirkby notai eru hr. a er a finna mjg mikinn frleik.

Hgt er a hlusta og horfa erindi me v a smella hr.

Lng grein eftir Jasper Kirkby Cosmic Rays and Climate er hr.

Hr er lsing verkefninu. etta er m.a. listi yfir r stofnanir sem koma a verkinu, tmatlun, kostnaartlanir og tlanir um fjlda starfsmanna sem vinna munu a verkefninu. etta skjal er fr rinu 2006 egar smi tkjabnains var a hefjast.

N eru hjlin greinilega farin a snast. Hva skyldi koma t essari tilraun hj CERN? Mun hn renna stoum undir kenningar Svensmark? Ef svo fer, mun a skekja vsindaheiminn svo um munar?

a er auvita allt of snemmt a vera me einhverjar getgtur, en hugsanlega verum vi einhvers frari nsta ri.

r vitali vi Kirkby:

"I think the evidence for a link between reconstructions of past climate change and solar activity is too strong to ignore," explains Jasper Kirkby, Spokesperson for the CLOUD experiment. "There are a lot of observations showing that variations of the sun seem to be affecting the climate, but we don’t yet know what the mechanism for this is."

"The aim of CLOUD is to understand whether or not cosmic rays can affect clouds and climate, by studying the microphysical interactions of cosmic rays with aerosols, cloud droplets and ice particles." This is one of the possible mechanisms for solar-climate variability since the solar wind – the stream of charged particles ejected from the sun – varies over time and affects the intensity of the cosmic rays that reach the Earth.

"The whole process is well understood except for whether or not cosmic rays do indeed affect clouds. If that process can be established then I think solar-climate variability will very rapidly change from being a controversial subject to one with a lot of respectability. If, on the other hand, we rule out the process then this will allow us to focus on other mechanisms that might be causing the link."

Sj umfjllun um kenninguna bloggpistlinum fr 7. feb. 2007:

Byltingarkennd kenning dansks vsindamanns skekur vsindaheiminn.

Smella tvisvar mynd til a stkka.

essir hsklar og stofnanir standa a verkefninu:

University of Aarhus, Institute of Physics and Astronomy, Aarhus, Denmark

University of Bergen, Institute of Physics, Bergen, Norway

California Institute of Technology, Division of Chemistry and Chemical Engineering, Pasadena, USA

CERN, Geneva, Switzerland

Danish National Space Center, Copenhagen, Denmark

Finnish Meteorological Institute, Helsinki, Finland

Helsinki Institute of Physics, Helsinki, Finland

University of Helsinki, Laboratory of Aerosol and Environmental Physics, Helsinki, Finland

University of Kuopio, Department of Applied Physics, Kuopio, Finland

Lebedev Physical Institute, Solar and Cosmic Ray Research Laboratory, Moscow, Russia

University of Leeds, School of Earth and Environment, Leeds, United Kingdom

Leibniz Institute for Tropospheric Research, Leipzig, Germany

University of Mainz, Institute for Atmospheric Physics, Mainz, Germany

Max-Planck Institute for Nuclear Physics (MPIK), Heidelberg, Germany

University of Missouri-Rolla, Cloud and Aerosol Sciences Laboratory, Rolla, USA

State University of New York at Albany, Atmospheric Sciences Research Center, New York, USA

Paul Scherrer Institute, Laboratory of Atmospheric Chemistry, Switzerland

University of Reading, Department of Meteorology, Reading, United Kingdom

Rutherford Appleton Laboratory, Space Science & Particle Physics Depts., Chilton, United Kingdom

Tampere University of Technology, Department of Physics, Tampere, Finland

University of Vienna, Institute for Experimental Physics, Vienna, Austria



Sasta frsla | Nsta frsla

Athugasemdir

1 Smmynd: Baldur Kristinsson

g las bk Svensmarks og Calders, The Chilling Stars, fyrir nokkrum mnuum. Bkin finnst mr einkennast af yfirdramatseringu, en kenningin eigi a sur athygli ver. g reyndi v a finna heimildir um hana netinu, og rakst fljtlega greiningu Sloans og Wolfendales skjamyndun 11 ra tmabili. Kjarninn kenningu Svensmarks er a egar segulsvi slar veikist, veri gufuhvolfi fyrir meiri geimgeislum sem svo hafi fr me sr meiri skjamyndun. Niurstaa Sloans og Wolfendales var a veurathuganir bendi besta lagi til mjg veiks samhengis milli geimgeisla og skjafars. egar vi etta btist, a Svensmark hefur veri a reyna a finna veurfarsggn kenningunni til stunings a.m.k. fr 1996, en me mjg litlum rangri, tel g vst a jafnvel tt honum takist a sna fram samhengi milli geimgeisla og rdropamyndunar rannsknarstofunni, hafi a afar lti a segja fyrir veurkerfi jararinnar, ar sem a eru svo miklu fleiri og hrifameiri ttir sem skipta mli.

Baldur Kristinsson, 8.6.2009 kl. 22:44

2 Smmynd: Emil Hannes Valgeirsson

Hvenr megum vi svo eiga von einhverjum niurstum?

Emil Hannes Valgeirsson, 8.6.2009 kl. 23:17

3 Smmynd: Loftslag.is

g treysti v a kynnir niursturnar egar r koma, en ar til held g varla a kenning Svensmarks standist skoun- en sjum til hva kemur t r essu.

Loftslag.is, 8.6.2009 kl. 23:31

4 Smmynd: gst H Bjarnason

Emil spyr hvenr vi megum eiga von niurstum.

vefsu CERN http://cdsweb.cern.ch/record/1180849?ln=no stendur inngangi:

The team from the CLOUD experiment - the world’s first experiment using a high-energy particle accelerator to study the climate - were on cloud nine after the arrival of their new three-metre diameter cloud chamber. This marks the end of three years’ R&D; and design, and the start of preparations for data taking later this year.

Meira veit g ekki.

gst H Bjarnason, 9.6.2009 kl. 07:02

5 Smmynd: gst H Bjarnason

Varandi tmatlun, sj hr:

http://cloud.web.cern.ch/cloud/documents_cloud/cloud_addendum_3.pdf

essi tlun er fr rinu 2006.

gst H Bjarnason, 9.6.2009 kl. 07:07

6 Smmynd: Sveinn Atli Gunnarsson

Megi eim CERN ganga sem best vi essar tilraunir. Persnulega g n ekki von a essar tilraunir valdi grundvallarbreytingum viteknum kenningum vsindamanna dag varandi loftslagsml. Spyrjum a leikslokum, en vinnum t fr viteknum og viurkenndum kenningum annga til ea ef anna skyldi koma ljs sar. g treysti v a greinir tarlega fr niurstum egar r byrja a berast.

Mbk.

Sveinn Atli Gunnarsson, 9.6.2009 kl. 07:59

7 Smmynd: Kjartan Ptur Sigursson

Mjg svo hugavert. Hva tli valdi v a slendingar reyna ekki a komast meira inn svona verkefni. g veit a danskir hsklar eru fullu svona verkefnum.

Kjartan Ptur Sigursson, 9.6.2009 kl. 12:51

8 Smmynd: gst H Bjarnason

g var a bta inn pistilinn lista yfir hskla og stofnanir sem standa a verkefninu. v miur er sland ekki blai ar.

gst H Bjarnason, 9.6.2009 kl. 13:00

9 Smmynd: sds Sigurardttir

etta er svo gfulegt, g n essu ekki llu, en hr er skja dag.

sds Sigurardttir, 9.6.2009 kl. 16:51

Bta vi athugasemd

Ekki er lengur hgt a skrifa athugasemdir vi frsluna, ar sem tmamrk athugasemdir eru liin.

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Ágúst H Bjarnason
Ágúst H Bjarnason

Verkfr. hjá Verkís.
agbjarn-hjá-gmail.com

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Aðeins málefnalegar athugasemdir, sem eiga ótvíætt við efni viðkomandi pistils, og skrifaðar án skætings og neikvæðni í garð annarra, og að jafnaði undir fullu nafni, verða birtar. 

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