MacMynowski, Douglas G. and Shin, Ho-Jeong and Caldeira, Ken (2011) The frequency response of temperature and precipitation in a climate model. Geophysical Research Letters, 38 . Art. No. L16711. ISSN 0094-8276 http://resolver.caltech.edu/CaltechAUTHORS:20110922-135931901
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Dynamic aspects of the climate's response to forcing are typically explored through transient simulations in the time domain. However, because of the large range of time-scales involved, some features are more easily observed in the frequency domain. We compute the frequency-response of the HadCM3L general circulation model (GCM) to sinusoidal perturbations in solar radiative forcing, with periods between 2^(−1/2) and 2^9 (512) years. The global mean temperature response decreases with increasing frequency, and the frequency scaling at time-scales longer than one year is consistent with the behavior of diffusion into a semi-infinite slab. The land-sea contrast and land-averaged precipitation, however, exhibit relatively little dependency on the frequency of the imposed perturbation, with significant response at both short and long periods. Understanding these relative characteristics of different climate variables in the frequency domain is important to understanding the transient response of the climate system to both anthropogenic and natural (e.g., volcanic) forcings; the frequency response is also relevant in understanding the spectrum of natural variability.
|Additional Information:||© 2011 American Geophysical Union. Received 22 June 2011; revised 20 July 2011; accepted 21 July 2011; published 25 August 2011. The Editor thanks Klaus Fraedrich and an anonymous reviewer.|
|Subject Keywords:||dynamics; fast/slow; frequency response; variability|
|Official Citation:||MacMynowski, D. G., H.-J. Shin, and K. Caldeira (2011), The frequency response of temperature and precipitation in a climate model, Geophys. Res. Lett., 38, L16711, doi:10.1029/2011GL048623|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||27 Sep 2011 21:35|
|Last Modified:||26 Dec 2012 13:42|
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