Publication: Megadroughts in Southwestern North America in ECHO-G millennial simulations and their comparison to proxy drought reconstructions
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2013-10
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American Meteorological Society
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Simulated hydroclimate variability in millennium-length forced transient and control simulations from the ECHAM and the global Hamburg Ocean Primitive Equation (ECHO-G) coupled atmosphere-ocean general circulation model (AOGCM) is analyzed and compared to 1000 years of reconstructed Palmer drought severity index (PDSI) variability from the North American Drought Atlas (NADA). The ability of the model to simulate megadroughts in the North American southwest is evaluated. (NASW: 25º-42.5ºN, 125º-105ºW). Megadroughts in the ECHO-G AOGCM are found to be similar in duration and magnitude to those estimated from the NADA. The droughts in the forced simulation are not, however, temporally synchronous with those in the paleoclimate record, nor are there significant differences between the drought features simulated in the forced and control runs. These results indicate that model-simulated megadroughts can result from internal variability of the modeled climate system rather than as a response to changes in exogenous forcings. Although the ECHO-G AOGCM is capable of simulating megadroughts through persistent La Nina-like conditions in the tropical Pacific, other mechanisms can produce similarly extreme NASW moisture anomalies in the model. In particular, the lack of low-frequency coherence between NASW soil moisture and simulated modes of climate variability like the El Nino-Southern Oscillation, Pacific decadal oscillation, and Atlantic multidecadal oscillation during identified drought periods suggests that stochastic atmospheric variability can contribute significantly to the occurrence of simulated megadroughts in the NASW. These findings indicate that either an expanded paradigm is needed to understand multidecadal hydroclimate variability in the NASW or AOGCMs may incorrectly simulate the strength and/or dynamics of the connection between NASW hydroclimate variability and the tropical Pacific.
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© 2013 American Meteorological Society. SC, JES, and RS are supported by the NOAA Award Global Decadal Hydroclimate Variability and Change (NA10OAR431037). RS was also supported by NSF Award ATM09-02716 and NOAA Award NA08-OAR4320912. BIC was supported by the NSF Award North American Megadroughts: Atmosphere-Ocean Forcing and Landscape Response from the Medieval Period to the Near-Term Greenhouse Future (ATM-0902716). JFGR was supported by MMAMRM-200800050084028//200800050083542, MCIN-CGL2008-06558-C02-01, and UCM/921407. Cross-wavelet and wavelet coherence software was provided by A. Grinsted.
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Burgman, R., R. Seager, A. Clement, and C. Herweijer, 2010: Role of tropical Pacific SSTs in global medieval hydroclimate: A modeling study. Geophys. Res. Lett., 37, L06705, doi:10.1029/2009GL042239.
Burke, E. J., and S. J. Brown, 2008: Evaluation uncertainties in the projection of future drought. J. Hydrometeor., 9, 292–299.
Cobb, K. M., C. D. Charles, H. Cheng, and R. L. Edwards, 2003: El Niño-Southern Oscillation and tropical Pacific climate during the last millennium. Nature, 424, 271–276.
Cook, B. I., R. Seager, R. L. Miller, and J. A. Mason, 2013: Intensification of North American megadroughts through surface and dust aerosol forcing. J. Climate, 26, 4414–4430.
Cook, E. R., R. Seager, M. A. Cane, and D. W. Stahle, 2007: North American drought: Reconstructions, causes, and consequences. Earth Sci. Rev., 81 (1–2), 93–134.
——, ——, R. R. Heim, R. S. Vose, C. Herweijer, and C. A. Woodhouse, 2010: Megadroughts in North America: Placing IPCC projections of hydroclimatic change in a long-term paleoclimate context. J. Quat. Sci., 25, 48–61, doi:10.1002/jqs.1303.
Dai, A., K. E. Trenberth, and T. R. Karl, 1998: Global variations in droughts and wet spells: 1900-1995. Geophys. Res. Lett., 25, 3367–3370.
——, ——, and T. Qian, 2004: A global dataset of Palmer drought severity index for 1870–2002: Relationship with soil moisture and effects of surface warming. J. Hydrometeor., 5, 1117–1130.
Dümenil, L., and E. Todini, 1992: A rainfall-runoff scheme for use in the Hamburg climate model. Adv. Theor. Hydrol., 9, 129–157.
Emile-Geay, J., K. Cobb, M. Mann, and A. T. Wittenberg, 2013: Estimating central equatorial Pacific SST variability over the past millennium. Part II: Reconstructions and implications. J. Climate, 26, 2329–2352.
Enfield, D. B., A. M. Mestas Nuñez, and P. J. Trimble, 2001: The Atlantic multidecadal oscillation and its relation to rainfall and river flows in the continental US. Geophys. Res. Lett., 28, 2077–2080.
Feng, S., R. J. Oglesby, C. M. Rowe, D. B. Loope, and Q. Hu, 2008: Atlantic and Pacific SST influences on medieval drought in North America simulated by the Community Atmospheric Model. J. Geophys. Res., 113, D11101, doi:10.1029/2007JD009347.
González Rouco, J. F., H. Beltrami, E. Zorita, and H. Von Storch, 2006: Simulation and inversion of borehole temperature profiles in surrogate climates: Spatial distribution and surface coupling. Geophys. Res. Lett., 33, L01703, doi:10.1029/2005GL024693.
——, ——, ——, and M. B. Stevens, 2009: Borehole climatology: A discussion based on contributions from climate modeling. Climate Past, 5, 97–127.
Graham, N. E., and Coauthors, 2007: Tropical Pacific–mid-latitude teleconnections in medieval times. Climatic Change, 83, 241–285.
Herweijer, C., R. Seager, and E. R. Cook, 2006: North American droughts of the mid to late nineteenth century: A history, simulation and implication for mediaeval drought. Holocene, 16, 159–171.
——, ——, ——, and J. Emile-Geay, 2007: North American droughts of the last millennium form a gridded network of tree-ring data. J. Climate, 20, 1353–1376.
Hunt, B. G., 2011: Global characteristics of pluvial and dry multiyear episodes with emphasis on megadroughts. Int. J. Climatol., 31, 1425–1439.
Kaplan, A., M. A. Cane, Y. Kushnir, A. C. Clement, M. B. Blumenthal, and B. Rajagopalan, 1998: Analyses of global sea surface temperature 1856-1991. J. Geophys. Res., 103 (C9), 18 567–18 589.
Karnauskas, B. K., R. Seager, A. Kaplan, Y. Kushnir, and M. A. Cane, 2009: Observed strengthening of the zonal sea surface temperature gradient across the equatorial Pacific Ocean. J. Climate, 22, 4316–4321.
——, J. E. Smerdon, R. Seager, and J. F. González Rouco, 2012: A Pacific centennial oscillation predicted by coupled GCMs. J. Climate, 25, 5943–5961.
Kushnir, Y., R. Seager, M. Ting, N. Naik, and J. Nakamura, 2010: Mechanisms of tropical Atlantic SST influence on North American hydroclimate variability. J. Climate, 23, 5610-5628.
Legutke, S., and R. Voss, 1999: The Hamburg atmosphere-ocean coupled general circulation model—ECHO-G. Deutsches Klimarechenzentrum Rep., 62 pp.
Mann, M. E., and J. M. Lees, 1996: Robust estimation of background noise and signal detection in climatic time series. Climatic Change, 33, 409–445.
Meehl, G. A., and A. Hu, 2006: Megadroughts in the Indian monsoon region and southwest North America and a mechanism for associated multidecadal Pacific sea surface temperature anomalies. J. Climate, 19, 1605–1623.
Milly, P. C. D., and K. A. Dunne, 2010: On the hydrologic adjustment of climate-model projections: The potential pitfall of potential evapotransporation. Earth Interact., 15. [Available online at http://EarthInteractions.org.]
Min, S.-K., S. Legutke, A. Hense, and W.-T. Kwon, 2005a: Internal variability in a 1000-yr control simulation with coupled climate model ECHO-G—1. Near-surface temperature, precipitation and mean sea level pressure. Tellus, 57A, 605-621.
——, ——, ——, and ——, 2005b: Internal variability in a 1000-yr control simulation with coupled climate model ECHO-G—2. El Niño Southern Oscillation and North Atlantic Oscillation. Tellus, 57A, 622–640.
Nigam, S., B. Guan, and A. Ruiz Barradas, 2011: Key role of the Atlantic multidecadal oscillation in 20th century drought and wet periods over the Great Plains. Geophys. Res. Lett., 38, L16713, doi:10.1029/2011GL048650.
Oglesby, J. R., S. Feng, Q. Hu, and C. Rowe, 2011: Medieval drought in North America: The role of the Atlantic multidecadal oscillation. PAGES News, Vol. 19, No. 1, PAGES International Project Office, Bern, Switzerland, 18–19.
Pachauri, R. K., and A. Reisinger, Eds., 2007: Climate Change 2007: Synthesis Report. IPCC, 104 pp.
Sarachik, E. S., and M. A. Cane, 2010: The El Niño-Southern Oscillation Phenomenon. Cambridge University Press, 369 pp.
Schlenker, W., W. M. Hanemann, and A. C. Fisher, 2007: Water availability, degree days, and the potential impact of climate change on irrigated agriculture in California. Climatic Change, 81, 19–28.
Schubert, S. D., M. J. Suárez, P. J. Pegion, R. D. Koster, and J. Bacmeister, 2004a: Causes of long-term drought in the U. S. Great Plains. J. Climate, 17, 485–503.
——, ——, ——, ——, and J. Bacmeister, 2004b: On the cause of the 1930s Dust Bowl. Science, 303, 1855–1859.
Seager, R., and G. Vecchi, 2010: Greenhouse warming and the 21st century hydroclimate of southwestern North America. Proc. Natl. Acad. Sci. USA, 107, 21 256–21 262.
——, Y. Kushnir, C. Herweijer, N. Naik, and J. Velez, 2005: Modeling of tropical forcing of persistent droughts and pluvials over western North America: 1856-2000. J. Climate, 18, 4065–4088.
——, and Coauthors, 2007: Model projections of an imminent transition to a more arid climate in southwestern North America. Science, 316, 1181–1184.
——, R. Burgman, Y. Kushnir, A. Clement, E. Cook, N. Naik, and J. Miller, 2008a: Tropical Pacific forcing of North American medieval megadroughts: Testing the concept with an atmosphere model forced by coral-reconstructed SSTs. J. Climate, 21, 6175–6190.
——, Y. Kushnir, M. Ting, M. A. Cane, N. Naik, and J. Vélez, 2008b: Would advance knowledge of 1930s SSTs have allowed prediction of the Dust Bowl drought? J. Climate, 21, 3261–3281.
Sheffield, J., E. F. Wood, and M. L. Roderick, 2012: Little change in global drought over the past 60 years. Nature, 491, 435–438.
Stevens, M. B., J. E. Smerdon, J. F. González Rouco, M. Stieglitz, and H. Beltrami, 2007: Effects of bottom boundary placement on subsurface heat storage: Implications for climate model simulations. Geophys. Res. Lett., 34, L02702, doi:10.1029/2006GL028546.
Stine, S., 1994: Extreme and persistent drought in California and Patagonia during medieval time. Nature, 369, 546–549.
Taylor, K. E., R. J. Stouffer, and G. A. Meehl, 2011: A summary of the CMIP5 experiment design. World Climate Research Programme Rep., 33 pp. [Available online at http://cmip-pcmdi.llnl.gov/cmip5/docs/Taylor_CMIP5_design.pdf.]
Thompson, D. W. J., and J. M. Wallace, 1998: The Arctic Oscillation signature in the wintertime geopotential height and temperature fields. Geophys. Res. Lett., 25, 1297–1300.
Thornthwaite, C. W., 1948: An approach toward a rational classification of climate. Geogr. Rev., 38, 55–94.
von Storch, H., E. Zorita, J. M. Jones, Y. Dimitriev, F. González Rouco, and S. F. B. Tett, 2004: Reconstructing past climate from noisy data. Science, 306, 679–682.
Woodhouse, C. A., and J. T. Overpeck, 1998: 2000 years of drought variability in the central United States. Bull. Amer. Meteor. Soc., 79, 2693–2714.
Zhang, Y., J. M. Wallace, and D. S. Battisti, 1997: ENSO-like interdecadal variability: 1900–93. J. Climate, 10, 1004–1020.
Zorita, E., F. González Rouco, and S. Legutke, 2003: Testing the Mann et al. (1998) approach to paleoclimate reconstructions in the context of a 1000-yr control simulation with the ECHO-G coupled climate model. J. Climate, 16, 1378–1390.
——, J. F. González Rouco, H. von Storch, J. P. Montávez, and F. Valero, 2005: Natural and anthropogenic modes of surface temperature variations in the last thousand years. Geophys. Res. Lett., 23, L08707, doi:10.1029/2004GL021563.