Souleymane Fall of Purdue University has alerted us to a very interesting new paper on trends in the combined effect on heat of water vapor and sensible temperature (i.e., moist enthalpy; see Pielke et al. 2004). The paper is P. Ribera, D. Gallego, L. Gimeno, J.F. Perez-Campos, R. García-Herrera, E. Hernández, L. de la Torre, R. Nieto and N. Calvo 2004: The Use of Equivalent Temperature to Analyze Climate Variability. Studia Geophysica et Geodaetica. 459-468.
The abstract reads
“Equivalent temperature based in the NCEP/NCAR reanalysis database has been used as a simultaneous measure of temperature and humidity. Its variations during the 1958−1998 added to the effect of the inclusion of satellite data during the late seventies have been analyzed. An increase of the globally averaged equivalent temperature has been detected, the trend has been considerably greater during the first half of the study period and significant differences can be found between continental and oceanic areas. The relation of the trend with four of the main modes of climate variability has been assessed. The North Atlantic Oscillation and the Artic Oscillations are closely related to the equivalent temperature over the North Atlantic basin, extending toward Northern Asia in the second case. El Niño/Southern Oscillation and the Antarctic Oscillation seem to have a more global effect.”
An important statement from the Conclusions reads,
“The small global trend for the two separate periods 1958−78 and 1979−98 suggests that the trend for the entire study period could be due to the late 70’s shift in the data. Nevertheless, not all the ET trends are attributable to this shift, which is neither spatially nor temporally uniform. Significant trends of different sign and strength can be found over continental or oceanic areas depending on the considered period.”
The journal’s name is Studia Geophysica et Geodaetica.
“Studia Geophysica et Geodaetica is an international journal covering all aspects of geophysics, meteorology and climatology, and of geodesy. Published by the Geophysical Institute of the Academy of Sciences of the Czech Republic, it has a long tradition, being published quarterly since 1956. Studia publishes theoretical and methodological contributions, which are of interest for academia as well as industry. The journal offers fast publication of contributions in regular as well as topical issues.”
This paper shows why it is so important to evaluate total heat energy (sensible and latent heat) in the assessment of multi-decadal climate trends of warming and cooling.