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Xiaofang Feng, Qinghua Ding, Liguang Wu, Charles Jones, Ian Baxter, Robert Tardif, Samantha Stevenson, Julien Emile-Geay, Jonathan Mitchell, Leila M. V. Carvalho, Huijun Wang, and Eric J. Steig

. 2019 ). Table 1. List of the 40 global climate models in CMIP5. c. Examination of proxy data performance in LMR2 LMR2 assimilates more than 2000 proxy records from the PAGES 2k version 2 ( PAGES2k Consortium 2017 ) and the additional proxy records ( Anderson et al. 2019 ). In the following analysis, we evaluate to what extent the temperature output from LMR2 reflects these records. We therefore select the 550 records from PAGES 2k version 2 considered in LMR2 since these were more carefully

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Ryan L. Fogt and Alex J. Wovrosh

details are outlined in Neale et al. (2013) . Although the Community Atmospheric Model, version 5, has been developed as the successor to the CAM4 model, specific simulations like those investigated here are not yet available, and there has not yet been an extensive published evaluation of this model performance. Table 1. CAM4 simulation details. All simulations were run with a resolution of 0.9° × 1.25° resolution, and only monthly mean data were investigated in this study. b. Atmospheric

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Hyo-Seok Park, Sukyoung Lee, Seok-Woo Son, Steven B. Feldstein, and Yu Kosaka

Arctic winter, we will show with model calculations that the relatively thin sea ice over the Barents, Kara, and Laptev Seas (see Fig. S1 in the online supplemental material) readily decreases for typical positive downward IR anomalies. In this study, we investigate the increase in wintertime downward IR and the associated sea ice melting (or suppression of sea ice growth). As we will show, Arctic downward IR fluctuates on a weekly time scale. We use the European Centre for Medium-Range Weather

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Changhyun Yoo, Sungsu Park, Daehyun Kim, Jin-Ho Yoon, and Hye-Mi Kim

the extratropical extreme warm and cold events during boreal winter are associated with wave responses to tropical MJO forcing. Understanding the MJO and its teleconnection is therefore crucial for an accurate forecast of extratropical weather and climate including for North America, especially for the 2–4-week range. Despite the importance of MJO teleconnection, realistic representation of the MJO has been a longstanding challenge for global climate models ( Slingo et al. 1996 ; Lin et al. 2006

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Ariaan Purich, Matthew H. England, Wenju Cai, Yoshimitsu Chikamoto, Axel Timmermann, John C. Fyfe, Leela Frankcombe, Gerald A. Meehl, and Julie M. Arblaster

. M. and J. M. A. were partially supported by the Regional and Global Climate Modeling Program (RGCM) of the U.S. Department of Energy’s Office of Biological and Environmental Research (BER) Cooperative Agreement DE-FC02-97ER62402 and the National Science Foundation. The CESM1 experiments were supported by the University of Southern California Center for High-Performance Computing and Communications ( ) and the high-performance computing from Yellowstone ( http://n2t

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Graham R. Simpkins, Yannick Peings, and Gudrun Magnusdottir

and SAM indices are uncorrelated during JJA. To evaluate whether the model-derived WC and HC-driven mechanisms are similar to observations, Fig. 5 displays the difference in tropical variables between ATL3W and ATL3C. In comparing Figs. 3 and 5 , it is apparent that the model captures the large-scale tropical changes that drive high-latitude teleconnections. A marked modification to the WC is prevalent ( Figs. 5b,c ), with changes that are ~25% stronger than the observational counterparts

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David P. Schneider, Clara Deser, and Tingting Fan

Antarctica, the austral summer increase in the SAM during 1969–98 broadly parallels the drop in total column ozone concentration ( Thompson and Solomon 2002 ). The response to ozone depletion—a positive trend in the SAM—is consistent across a wide variety of models and experimental designs (e.g., Gillett and Thompson 2003 ; Son et al. 2010 ; Polvani et al. 2011 ; Eyring et al. 2013 ). Generally, the circulation response to ozone depletion has been attributed to polar stratospheric cooling, which

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Aaron B. Wilson, David H. Bromwich, and Keith M. Hines

an atmospheric model with prescribed global SSTs to simulate different El Niño flavors based on observed SSTs and evaluate their atmospheric circulation differences. Does the model provide robust signals that verify the dynamics, both in the zonal mean sense as well as specifically over the Pacific Ocean sector, as explained by previous research on the observed El Niño–SAM coupled forcing of high-latitude circulation ( Seager et al. 2003 ; Fogt et al. 2011 ; Lim et al. 2013 )? With the

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Kyle R. Clem, James A. Renwick, and James McGregor

peninsula. A modeling study by Ding et al. (2011) concluded that winter warming of West Antarctica is caused by an anticyclonic circulation over the Amundsen Sea forced by increasing SSTs in the central tropical Pacific. The anticyclone brings warm air advection onto the continent via western West Antarctica; however, this circulation pattern would be associated with cooling over the peninsula during winter, which is not seen in observations and is inconsistent with the winter deepening of the ASL

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