Head in a Cloud

troposphere and stratosphere meet blogosphere

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Entries Tagged as 'troposphere'

Dangerous Assumptions

November 26th, 2008 · 6 Comments

Recently I read an article in Nature that highlighted major issues with the IPCC report. This article is titled Dangerous Assumptions and written by Roger Pielke, Tom Wigley, and Christopher Green. The main argument put forward by the authors is that the Intergovernmental Panel on Climate Change (IPCC) assumes a large amount of spontaneous technological [...]

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Tags: ATOC Journal Club · climate · general interest · troposphere

The Influence of Changes in Cloud Cover on Recent Surface Temperature Trends in the Arctic

April 4th, 2008 · 1 Comment

Atmospheric circulation and the global energy budget are largely influenced by surface temperature. Thompson and Wallace (1998) showed that the Arctic Oscillation (AO) is the principal component of the Northern Hemisphere sea level pressure poleward of 20°N and Thompson et al (2000) showed that the AO accounts for as much as 50% of the winter [...]

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Tags: global warming · MTR3440 · troposphere

“The Role of Cloud-Top Brightness Temperatures in the Production of Heavy Precipitation”

March 7th, 2008 · 3 Comments

“The operational meteorological community is increasingly realizing the important role of cloud microphysics in the production of heavy precipitation, especially snow(e.g., Roebber et al. 2003)”. This is a direct quote from the journal article “Cloud-Top Temperatures for Precipitating Winter Clouds” by Jay W. Hanna, David M. Schultz, & Antonio R. Irving, of which I will [...]

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Tags: clouds · MTR3440 · satellite · troposphere

Year 2100: Yup, Even Hotter!

September 27th, 2007 · 3 Comments

Editor’s note:  We are proud to begin presenting summaries of the presentations made at the weekly ATOC Journal Club.  Below is the first posting, by Jason English, based on a talk he gave yesterday.  We hope these postings will serve as a useful forum for post-Journal Club discussions.  Enjoy!  -Sean In July, Chen et. al. [...]

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Tags: aerosols · ATOC Journal Club · climate · global warming · modeling · troposphere

Background on Rethinking Organic Aerosols: Semivolatile Emissions and Photochemical Aging by Robinson et al.

April 2nd, 2007 · No Comments

Editor’s note: The following post was graciously contributed by Peter DeCarlo, a fellow Ph.D. candidate at the University of Colorado. His piece offers some background and commentary on the previous post.

Organic aerosols are studied in a variety of ways (field observations, lab studies, modeling, etc.) as most atmospheric constituents tend to be. With organic aerosols there have been considerable discrepancies in recent years between what is measured in the field, and what is modeled. Models assume a large fraction of the organic aerosol is primary based on early aerosol studies involving GC-MS (coupled gas chromatography and mass spectrometry). These studies found a significant portion of the resolvable aerosol to be primary…

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Tags: aerosols · field measurements · modeling · troposphere