alexa Bracketing Climatological Mid-tropospheric Temperatures
ISSN : 2332-2594

Journal of Climatology & Weather Forecasting
Open Access

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Review Article

Bracketing Climatological Mid-tropospheric Temperatures in the Northern Hemisphere: An Observational Study 1979-2013

Chase TN1*, Herman BM2 and Pielke Sr RA1,3
1Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, CO USA
2Department of Atmospheric Sciences, University of Arizona, Tucson, AZ USA
3Department of Atmospheric and Ocean Sciences, University of Colorado, Boulder, CO USA
Corresponding Author : Chase TN
Cooperative Institute for Research in Environmental Sciences (CIRES)
University of Colorado, Boulder, CO USA
Tel: 303-492-1274
E-mail: [email protected]
Received: March 25, 2015 Accepted: April 02, 2015 Published: April 06, 2015
Citation: Chase TN, Herman BM, Pielke Sr RA (2015) Bracketing Climatological Mid-tropospheric Temperatures in the Northern Hemisphere: An Observational Study 1979-2013. J Climatol Weather Forecasting 3:131. doi:10.4172/2332-2594.1000131
Copyright: © 2015 Chase TN. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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Abstract

We examine mid-tropospheric temperatures in the Northern Hemisphere using the 500 mb pressure surface from reanalysis data as a representative level. This standard analysis level is significant meteorologically (i.e. for frontal identification and jet stream dynamics) and climatologically (e.g. changes in long term front and jet structures would be expected to extend throughout the troposphere as would tropospheric warming). We find that 500 mb temperatures are bracketed between about –42°C and –3°C with very few excursions beyond these brackets suggesting a limiting physical process or processes. In this paper we update the data for the –42°C limit which we have proposed in previous papers, document the –3°C limit for the first time, and briefly discuss the possible physical mechanisms responsible for this observed temperature bracketing concluding that the limits on both maximum and minimum temperatures are due to convective processes. This self-regulation of tropospheric temperatures constrains changes in jet stream and baroclinic storm dynamics and therefore constrains changes in climate variability.

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