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Toshi Matsui, Charles Ichoku, Cynthia Randles, Tianle Yuan, Arlindo M. da Silva, Peter Colarco, Dongchul Kim, Robert Levy, Andrew Sayer, Mian Chin, David Giles, Brent Holben, Ellsworth Welton, Thomas Eck, and Lorraine Remer

international partners in providing multisensor views of aerosol distributions and aerosol–cloud interactions, NASA plans to launch the ACE mission in 2023, as part of the NASA Earth Science Tier-2 Decadal Survey missions. ACE aims to improve our understanding of aerosol forcing, particularly the highly uncertain aerosol indirect effects, with a multiangle, multispectral polarimeter, a high-spectral-resolution lidar, a dual-frequency (Ka–W bands) Doppler radar, and an ocean ecosystem spectroradiometer. ACE

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Juliane Otto, Calum Brown, Carlo Buontempo, Francisco Doblas-Reyes, Daniela Jacob, Martin Juckes, Elke Keup-Thiel, Blaz Kurnik, Jörg Schulz, Andrea Taylor, Tijl Verhoelst, and Peter Walton

communities. It was suggested that something analogous to the metrological traceability chain documenting the processing steps taken to produce remote sensing datasets (i.e., by QA4ECV) could be attractive for climate service products, ensuring that no uncertainty information gets lost in the chain while being tailored to the subsequent user needs. Scale group. Depending on the temporal and spatial scale of the study, different sources of uncertainty dominate; for example, random effects might be averaged

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Guy P. Brasseur, Mohan Gupta, Bruce E. Anderson, Sathya Balasubramanian, Steven Barrett, David Duda, Gregg Fleming, Piers M. Forster, Jan Fuglestvedt, Andrew Gettelman, Rangasayi N. Halthore, S. Daniel Jacob, Mark Z. Jacobson, Arezoo Khodayari, Kuo-Nan Liou, Marianne T. Lund, Richard C. Miake-Lye, Patrick Minnis, Seth Olsen, Joyce E. Penner, Ronald Prinn, Ulrich Schumann, Henry B. Selkirk, Andrei Sokolov, Nadine Unger, Philip Wolfe, Hsi-Wu Wong, Donald W. Wuebbles, Bingqi Yi, Ping Yang, and Cheng Zhou

have a cooling effect (negative RF) unless they coat soot particles, which exert warming effects. Note that BC particles are normally considered to be the main component of soot particles. Persistent linear contrails produced in the wake of aircraft contribute to net climate warming. Contrail-induced cirrus clouds (AIC) are also expected to affect the solar and terrestrial infrared radiative budget of the atmosphere, but the corresponding radiative forcing estimates remain highly uncertain. The NO

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F. M. Ralph, M. Dettinger, D. Lavers, I. V. Gorodetskaya, A. Martin, M. Viale, A. B. White, N. Oakley, J. Rutz, J. R. Spackman, H. Wernli, and J. Cordeira

impacts, and applications of AR information to decision-making. Submissions represent work on six continents plus Greenland. The conference was attended by 105 people, which included invited presentations, oral sessions, a poster session, and panels on applications to decision-making, definitions of atmospheric river, and future directions. Breakout sessions discussed AR forecasting, AR Monograph chapters, and ARs in future climates and subseasonal to seasonal prediction. Sessions were organized

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Xiangbo Feng, Nicholas Klingaman, Shaoqing Zhang, and Liang Guo

senior scientist talks, related to phenomena that drive EA water cycle extremes on time scales from synoptic to climate. Keywords from these 27 talks are presented in a word cloud ( Fig. 1 ). On each day, the workshop had three sections. First, ECRs presented their research, with talks organized by time scale (synoptic, subseasonal-to-seasonal, and climate); second, one or two senior scientists discussed challenges and future opportunities in numerical modeling; finally, there were small

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Jianping Li, Richard Swinbank, Ruiqiang Ding, and Wansuo Duan

of extreme climate events and a key part of the World Climate Research Programme (WCRP) Climate Variability and Predictability (CLIVAR) program. As Earth's climate changes over the coming years, the likelihood of extreme weather events will change most when natural and anthropogenic effects combine. The International Commission on Dynamical Meteorology (ICDM) of the International Association of Meteorology and Atmospheric Sciences (IAMAS) organized its 2012 international workshop 1 to better

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N. V. Koldunov, P. Kumar, R. Rasmussen, AL. Ramanathan, A. Nesje, M. Engelhardt, M. Tewari, A. Haensler, and D. Jacob

the water-related effects of changes in glacier mass balance and river runoff in western Himalayas. Given the research focus of the GLACINDIA project, the initial focus of the workshop was on glacier-related hydrological information. During stakeholder interactions the resulting discussion covered a much broader range of urgent climate change information needs for the Himalayan region. WORKSHOP FORMAT. In total, 30 stakeholders were invited to participate in the workshop. Among them, the minister

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Judith Berner, Ulrich Achatz, Lauriane Batté, Lisa Bengtsson, Alvaro de la Cámara, Hannah M. Christensen, Matteo Colangeli, Danielle R. B. Coleman, Daan Crommelin, Stamen I. Dolaptchiev, Christian L. E. Franzke, Petra Friederichs, Peter Imkeller, Heikki Järvinen, Stephan Juricke, Vassili Kitsios, François Lott, Valerio Lucarini, Salil Mahajan, Timothy N. Palmer, Cécile Penland, Mirjana Sakradzija, Jin-Song von Storch, Antje Weisheimer, Michael Weniger, Paul D. Williams, and Jun-Ichi Yano

amplitude is a function of the state, which is denoted by the red arrows of different length in Fig. 1g . The noise-induced drift changes the single-well potential of the unforced system ( Fig. 1e ), so that the effective potential including the effects of the multiplicative noise has multiple wells (not shown) and the associated PDF becomes bimodal ( Fig. 1h ). Note that in this example the shift in the mean compared to the unforced PDF ( Fig. 1f ) is caused by the noise, which is referred to as

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Chih-Pei Chang, Richard H. Johnson, Kyung-Ja Ha, Daehyun Kim, Gabriel Ngar-Cheung Lau, Bin Wang, Michael M. Bell, and Yali Luo

and Change (CLIVAR)/Global Energy and Water Cycle Experiment (GEWEX) Monsoon Panel, the Madden–Julian Oscillation (MJO) Task Force, the Subseasonal to Seasonal (S2S) Steering Group, the Years of the Maritime Continent (YMC) Scientific Steering Committee, Meteorological Service Singapore, the Chinese University of Hong Kong, the Asia–Pacific Economic Cooperation (APEC) Climate Center, and the World Scientific Publishing Company. The workshop opened with a special lecture in memory of Dr. D. R

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Michael Sprenger, Georgios Fragkoulidis, Hanin Binder, Mischa Croci-Maspoli, Pascal Graf, Christian M. Grams, Peter Knippertz, Erica Madonna, Sebastian Schemm, Bojan Škerlak, and Heini Wernli

illustrative examples of how these fields can be valuable for research on atmospheric variability on seasonal to decadal times. Whereas these examples focused on the first-order consistency between seasonal anomalies, the dataset also offers the option to consider higher-order effects (e.g., are there specific seasons when cyclone frequencies are increased in an ocean basin but WCB frequencies are not?). The web interface http://eraiclim.ethz.ch provides open access to monthly, seasonal, and longer

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