Articles | Volume 15, issue 6
Clim. Past, 15, 2053–2065, 2019
Clim. Past, 15, 2053–2065, 2019

Research article 19 Dec 2019

Research article | 19 Dec 2019

Two types of North American droughts related to different atmospheric circulation patterns

Angela-Maria Burgdorf et al.

Data sets

Ensemble Kalman Fitting Paleo-Reanalysis Version 1 (EKF400_v1) J. Franke, S. Brönnimann, J. Bhend, and Y. Brugnara

The ERA-Interim reanalysis: configuration and performance of the data assimilation system D. P. Dee, S. M. Uppala, A. J. Simmons, P. Berrisford, P. Poli, S. Kobayashi, U. Andrae, M. A. Balmaseda, G. Balsamo, P. Bauer, P. Bechtold, A. C. M. Beljaars, L. van de Berg, J. Bidlot, N. Bormann, C. Delsol, R. Dragani, M. Fuentes, A. J. Geer, L. Haimberger, S. B. Healy, H. Hersbach, E. V. Hólm, L. Isaksen, P. Kållberg, M. Köhler, M. Matricardi, A. P. McNally, B. M. Monge-Sanz, J.-J. Morcrette, B.-K. Park, C. Peubey, P. de Rosnay, C. Tavolato, J.-N. Thépaut, and F. Vitart

Megadroughts in North America: placing IPCC projections of hydroclimatic change in a long-term palaeoclimate context E. R. Cook, R. Seager, R. R. Heim, R. S. Vose, C. Herweijer, and C. A. Woodhouse

Paleo Hydrodynamics Data Assimilation product (PHYDA) N. J. Steiger

A reconstruction of global hydroclimate and dynamical variables over the Common Era N. J. Steiger, J. E. Smerdon, E. R. Cook, and B. I. Cook

The Twentieth Century Reanalysis Project G. P. Compo, J. S. Whitaker, P. D. Sardeshmukh, N. Matsui, R. J. Allan, X. Yin, B. E. Gleason, R. S. Vose, G. Rutledge, P. Bessemoulin, S. Brönnimann, M. Brunet, R. I. Crouthamel, A. N. Grant, P. Y. Groisman, P. D. Jones, M. C. Kruk, A. C. Kruger, G. J. Marshall, M. Maugeri, H. Y. Mok, Ø. Nordli, T. F. Ross, R. M. Trigo, X. L. Wang, S. D. Woodruff and S. J. Worley

Land Temperature Spanning 1753 to 2011 R. Rohde, R. A. Muller, R. Jacobsen, E. Muller, and C. Wickham

Berkeley Earth Temperature Averaging Process R. Rohde, R. Muller, R. Jacobsen, S. Perlmutter, and S. Mosher

Quantifying uncertainties in global and regional temperature change using an ensemble of observational estimates: The HadCRUT4 data set C. P. Morice, J. J. Kennedy, N. A. Rayner, and P. D. Jones

Model code and software

Southward shift of the northern tropical belt from 1945 to 1980 S. Brönnimann, A. M. Fischer, E. Rozanov, P. Poli, G. P. Compo, and P. D. Sardeshmukh

Short summary
The western USA is frequently affected by multiannual summer droughts. They can be separated into two groups with distinct spatial patterns. This study analyzes the atmospheric circulation during multiannual droughts in a new 3-D climate reconstruction. We confirm two distinct drought types differing with respect to atmospheric circulation as well as sea surface temperatures. Our results suggest that both the Pacific and the extratropical North Atlantic region affect North American droughts.