Suche
Datum:07.06.05
Titel:Did glacials start with global warming?
Link:www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6VBC-4G1WYBT-1&_coverDate=08%2F31%2F2005&_alid=284169614&_rdoc=1&_fmt=&_orig=search&_qd=1&_cdi=5923&_sort=d&view=c&_acct=C000043031&_version=1&_urlVersion=0&_userid=777686&md5=2f32d07c63c82f6ff4ace1a431bfec3b
Details1:Did glacials start with global warming?

George Kukla, and Joyce Gavin

Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964, USA

Received 23 January 2004; accepted 21 June 2004. Available online 27 April 2005.




Abstract
Correlation of paleoclimatic evidence with orbital changes shows that the build-up of polar ice accelerated when low obliquity coincided with perihelion in Northern Hemisphere winter. Under low obliquity the insolation was channeled to the tropics at the expense of both polar caps. As perihelion moved from winter solstice toward spring equinox, the solar beam in astronomic winter and spring became stronger than in summer and autumn. This orbital configuration under climate conditions like today would lead to warming of tropical oceans but cooling of the polar regions. The areally weighted global mean surface temperature, which is dominated by the low latitudes, would increase. Consequently, during the first millennia, the early glacial ice build-up was most likely accompanied by global warming. It was the associated increase of meridional insolation and temperature gradients, which were instrumental in the transition to a glacial.

A significant part of the current global warming is due to the gradual temperature increase of the tropical oceans. As the changing orbital configuration today resembles that of the last interglacial/glacial transition, the warming is likely to have a natural component.

Bitte auf den Link clicken !
Datei1:
Details2: 
Datei2:
Details3: 
Datei3:
Details4: 
Datei4:
Details5: 
Datei5:
Details6: 

Kurzmeldungen

Newsletter 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Newsletter abonnieren

 

If the facts change, I'll change my opinion.
What do you
do, Sir?
(John Maynard Keynes)

KlimaNotizen will dazu beitragen, dass die öffentlichen Diskussionen zur allgemeinen Klimaentwicklung ausgewogener werden.
Daher stehen hier vor allem Informationen, die in der öffentlichen Wahrnehmung zu kurz zu kommen scheinen.
Und daher ist KlimaNotizen selbst auch nicht ausgewogen.
Wer sich ein möglichst objektives Bild über Erkenntnisse und Meinungen verschaffen möchte, sollte selbst alle Informationen zur Kenntnis nehmen.
Dabei können die angeführten Links sehr hilfreich sein.

Impressum:
Klaus Öllerer
Viktoriastr. 5A
D30451 Hannover
Germany
email: klaus.oellerer@oellerer.net
phone: +49 (0)170 / 92 60 771

Die Inhalte angeführter Links und Quellen werden von diesen selbst verantwortet.

Diese Site dient ausschließlich wissenschaftlichen Zwecken