This work presents a detailed investigation of the changes in the global pattern of energetics under a prescribed temporal evolution of CO2 concentration as proposed by the A2 IPCC forcing scenario (SRES-A2) using a combination of reanalysis and climate models. A validation climatology is computed using the classic Lorenz energetic formulation, with generation and dissipation components estimated as residuals. The results show a good agreement overall between models and reanalysis for the present day climate, noting that the models generally give more zonal energy and less eddy energy when compared to the reanalysis. Spatial analysis translates the above results as models depicting greater energy associated with the subtropical jet streams than effectively observed. This pattern is observed regardless of season or hemisphere. The projections for future climate scenarios suggest a further increase in the zonal kinetic energy, with a slight average reduction in all other terms. This pattern is seen in association with a substantial decrease in the conversion term mainly associated with sensible heat transport (CA) under a warmer climate. In agreement with recent work in the literature, our results suggest an overall reduction of the global energetics under increasing CO2. 1. Introduction Recent studies have shown that the tendency for planetary temperature increase observed in the 20th century has caused a global change on the earth-atmosphere energy balance and consequently altered the atmospheric disturbances behavior in a broad range of spatial and temporal scales. The cause of the changes has been majorly attributed to a gradual and continued increase of greenhouse gas emissions to the atmosphere [1–3]. According to the fourth IPCC report [4], the fossil fuel burning process, demanded by the human energy consumption, land use, and agricultural activities are anthropogenic components responsible for the CO2 concentration increasing, as well as NH4 and N2O (hereafter called GHGs). The rising of the GHGs atmospheric concentration amplifies the greenhouse effect efficiency by trapping more heat in the atmosphere, and as a consequence the atmosphere has its circulation pattern altered and adjusted to the additional heating as to establish a new equilibrium condition. However, the consequences for the atmospheric circulation patterns can be felt trough the changes in a broad spatial and temporal scale of eddy disturbances. For example, the author in [1] investigated the linear relation between the frequency of cyclones and anticyclones with the Northern
References
[1]
E. Agee, “Trends in cyclone and anticyclone frequency and comparison with periods of warming and cooling over the northern hemisphere,” Journal of Climate, vol. 4, pp. 263–267, 1991.
[2]
J. Paciorek, S. Risbey, V. Ventura, and R. D. Rosen, “Multiple indices of Northern Hemisphere cyclone activity, winters 1949–1999,” Journal of Climate, vol. 15, no. 13, pp. 1573–1590, 2002.
[3]
B. Elsner, P. Kossin, and H. Jagger, “The increasing intensity of the strongest tropical cyclones,” Nature, vol. 455, pp. 92–95, 2008.
[4]
S. Solomon, D. Qin, M. Manning, et al., The Physical Science Basis. Contribution of Working Group I To the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Cambridge University Press, Cambridge, UK, 2007.
[5]
C. Serreze, F. Carse, G. Barry, and J. C. Rogers, “Icelandic low cyclone activity: climatological features, linkages with the NAO, and relationships with recent changes in the Northern Hemisphere circulation,” Journal of Climate, vol. 10, no. 3, pp. 453–464, 1997.
[6]
J. McCabe, C. Martyn, and C. Serreze, “Trends in Northern Hemisphere surface cyclone frequency and intensity,” Journal of Climate, vol. 15, pp. 2763–2768, 2001.
[7]
P. A. O'Gorman, “The effective static stability experienced by eddies in a moist atmosphere,” Journal of the Atmospheric Sciences, vol. 68, no. 1, pp. 75–90, 2011.
[8]
I. Simmonds and K. Keay, “Variability of Southern Hemisphere extratropical cyclone behavior,” Journal of Climate, vol. 13, no. 3, pp. 550–561, 2000.
[9]
E.-P. Lim and I. Simmonds, “Explosive cyclone development in the Southern Hemisphere and a comparison with Northern Hemisphere events,” Monthly Weather Review, vol. 130, no. 9, pp. 2188–2209, 2002.
[10]
A. B. Pezza and T. Ambrizzi, “Variability of Southern Hemisphere cyclone and anticyclone behavior: further analysis,” Journal of Climate, vol. 16, pp. 1075–1083, 2003.
[11]
A. B. Pezza, I. Simmonds, and A. Renwick, “Southern hemisphere cyclones and anticyclones: recent trends and links with decadal variability in the Pacific Ocean,” International Journal of Climatology, vol. 27, no. 11, pp. 1403–1419, 2007.
[12]
U. Neu, M. Akperov, and N. Bellenbaum, “IMILAST—a community effort to intercompare extratropical cyclone detection and tracking algorithms,” Bulletin of the American Meteorological Society, vol. 94, no. 4, pp. 529–547, 2013.
[13]
U. Ulbrich, G. Leckebusch, and J. Grieger, “Are greenhouse gas signals of Northern Hemisphere Winter extra-tropical cyclone activity dependen ton the identification and traking algorithm?” Meteorologische Zeitschrift, vol. 22, pp. 61–68, 2013.
[14]
M. Sugi and M. Sato, “Influence of the global warming on tropical cyclone climatology: an experiment with the JMA global model,” Journal of the Meteorological Society of Japan, vol. 80, no. 2, pp. 249–272, 2002.
[15]
K. Emanuel, “Increasing destructiveness of tropical cyclones over the past 30 years,” Nature, vol. 36, pp. 686–688, 2005.
[16]
K. Oouchi, “Tropical cyclone climatology in a global-warming climate as simulated in a 20？km-mesh global atmospheric model: frequency and wind intensity analyses,” Journal of the Meteorological Society of Japan, vol. 84, no. 2, pp. 259–276, 2006.
[17]
D. Hoyos, A. Agudelo, J. Webster, and A. Curry, “Deconvolution of the factors contributing to the increase in global hurricane intensity,” Science, vol. 312, no. 5770, pp. 94–97, 2006.
[18]
E. N. Lorenz, “Available potential energy,” Tellus, vol. 7, pp. 157–167, 1955.
[19]
B. Saltsman, “Equations governing the energetics of the larger scales of atmospheric turbulence in the domain of wave number,” Journal of Meteorology, vol. 14, pp. 513–523, 1957.
[20]
A. Plumb, “A new look at the energy cycle,” Journal of the Atmospheric Sciences, vol. 40, no. 7, pp. 1669–1688, 1983.
[21]
J. Lambert, “The effect of enhanced greenhouse warming on winter cyclone frequencies and strengths,” Journal of Climate, vol. 8, no. 5, pp. 1447–1452, 1995.
[22]
T. Iwasaki, “Atmospheric energy cycle viewed from wave-mean-flow interaction and Lagrangian mean circulation,” Journal of the Atmospheric Sciences, vol. 58, no. 20, pp. 3036–3052, 2001.
[23]
S. Murakami, “Atmospheric local energetics and energy interactions between mean and eddy fields. Part I: theory,” Journal of the Atmospheric Sciences, vol. 68, no. 4, pp. 760–768, 2011.
[24]
D. Hernández-Deckers and S. von Storch, “Energetics responses to increases in greenhouse gas concentration,” Journal of Climate, vol. 23, no. 14, pp. 3874–3887, 2010.
[25]
M. Kanamitsu, W. Ebisuzaki, J. Woollen et al., “NCEP-DOE AMIP-II reanalysis (R-2),” Bulletin of the American Meteorological Society, vol. 83, no. 11, pp. 1631–1643, 2002.
[26]
S. Uppala, W. Kayllberg, J. Simmonds, et al., “The ERA-40 reanalysis,” Quarterly Journal of the Royal Meteorological Society, vol. 131, pp. 2961–3012, 2005.
[27]
E. Roeckner, R. Brokofp, M. Esch, et al., “The atmospheric general circulation model ECHAM5. Part II: sensitivity of simulated climate to horizontal and vertical resolution,” Tech. Rep. 349, 2004.
[28]
F. Scinocca, A. McFarlane, M. Lazare, J. Li, and D. Plummer, “Technical note: the CCCma third generation AGCM and its extension into the middle atmosphere,” Atmospheric Chemistry and Physics, vol. 8, no. 23, pp. 7055–7074, 2008.
[29]
D. Salas-Mélia, F. Chauvin, M. Déqué, et al., “Description and validation of the CNRM-CM3 global coupled model,” CNRM Working Note 103, 2005.
[30]
J. Boer and S. Lambert, “The energy cycle in atmospheric models,” Climate Dynamics, vol. 30, no. 4, pp. 371–390, 2008.
[31]
C. Marques, A. Rocha, J. Corte-Real, J. M. Castanheira, J. Ferreira, and P. Melo-Gon？alves, “Global atmospheric energetics from NCEP-Reanalysis 2 and ECMWF-ERA40 Reanalysis,” International Journal of Climatology, vol. 29, no. 2, pp. 159–174, 2009.
[32]
D. Hernández-Deckers and S. von Storch, “The energetics response to a warmer climate: relative contributions from the transient and stationary eddies,” Earth System Dynamics, vol. 2, pp. 105–120, 2011.
[33]
C. Marques, A. Rocha, and J. Corte-Real, “Global diagnostic energetics of five state-of-the-art climate models,” Climate Dynamics, vol. 36, pp. 1767–1794, 2010.
[34]
R. Lupo, J. Oglesby, and I. Mokhov, “Climatological features of blocking anticyclones: a study of Northern Hemisphere CCM1 model blocking events in present-day and double CO2 concentration atmospheres,” Climate Dynamics, vol. 13, no. 3, pp. 181–195, 1997.
[35]
J. A. P. Veiga and T. Ambrizzi, “A global and hemispherical analysis of the Lorenz energetics based on the RepresentativeConcentration Pathways used in CMIP5,” Advances in Meteorology. In press.
[36]
J. Boer, “Some dynamical consequences of greenhouse gas warming,” Atmosphere, vol. 33, no. 4, pp. 731–751, 1995.
