A11R:
Evaluating Reanalysis: What Can We Learn about Past Weather and Climate? I


Session ID#: 10751

Session Description:
Reanalysis is a scientific method for producing a physically complete estimation of the past state and variability of geophysical systems (e.g., atmosphere, ocean). Reanalyses are frequently used as "observations" in assessing the fidelity of model simulations of the recent past, and also in studying short-term variability and long-term change in the system. However, inhomogeneities in the observing system and biases in the numerical models may lead to spurious changes and trends in reanalysis products. These issues can be addressed to some extent by intercomparing different reanalyses, and comparing reanalyses to independent observations. In this light, organized efforts such as the SPARC Reanalysis Intercomparison Project (S-RIP) and the EU-funded project UERRA have started to systematically evaluate reanalysis products. The session welcomes contributions on the evaluation and intercomparison of reanalyses, including global, regional, atmospheric, ocean, and coupled reanalyses. In particular, intercomparison of multiple reanalyses and comparisons with independent (non-assimilated) data are encouraged.
Primary Convener:  Jan Dominik Keller, Deutscher Wetterdienst, Lindenberg, Germany
Conveners:  Sean M Davis, NOAA Boulder, Chemical Sciences Laboratory, Boulder, CO, United States, James A Renwick, Victoria University of Wellington, Wellington, New Zealand and David H Bromwich, Byrd Polar & Climate Rsrch Ctr, Columbus, OH, United States
Chairs:  Jan Dominik Keller, Deutscher Wetterdienst, Lindenberg, Germany and Sean M Davis, NOAA Boulder, Chemical Sciences Laboratory, Boulder, CO, United States
OSPA Liaison:  Jan Dominik Keller, Deutscher Wetterdienst, Lindenberg, Germany

Cross-Listed:
  • GC - Global Environmental Change
  • H - Hydrology
  • NG - Nonlinear Geophysics
  • OS - Ocean Sciences
Index Terms:

1610 Atmosphere [GLOBAL CHANGE]
1616 Climate variability [GLOBAL CHANGE]
1620 Climate dynamics [GLOBAL CHANGE]
1635 Oceans [GLOBAL CHANGE]

Abstracts Submitted to this Session:

Providing Access to a Diverse Set of Global Reanalysis Dataset Collections (58739)
Douglas Schuster, Nat'l Ctr for Atmospheric Research, CISL/ISD/DECS, Boulder, CO, United States and Steven J Worley, National Center for Atmospheric Research, Boulder, CO, United States
Recent Reanalysis Activities at ECMWF: Results from ERA-20C and Plans for ERA5 (Invited) (60279)
Rossana Dragani1, Hans Hersbach2, Paul Poli1, Carole Pebeuy1, Shoji Hirahara1, Adrian Simmons2 and Dick Dee2, (1)European Center for Medium-Range Weather Forecasts, Reading, United Kingdom, (2)European Centre for Medium-Range Weather Forecasts, Copernicus, Reading, United Kingdom
Comparing the Evolution of the Hadley Circulation in the ECMWF ERA-20C Centennial Reanalysis and in the Atmospheric Model Ensemble ERA-20CM (79806)
Piero Lionello and Roberta D'Agostino, University of Salento, Lecce, Italy
Regional Ensemble Reanalysis (Invited) (60761)
Peter Jermey, Met Office (UK), Exeter, United Kingdom
Intercomparison of Reanalyses Temperatures in the Stratosphere with Non-Assimilated Rocketsonde, Lidar and Satellite Observations (Invited) (66323)
Craig S Long, NOAA Center for Weather and Climate Prediction, Climate Prediction Center, college park, MD, United States, Masatomo Fujiwara, Hokkaido University, Faculty of Environmental Earth Science, Sapporo, Japan and Dann Mitchell, University of Oxford, Physics, Oxford, United Kingdom
Evaluation of Atmospheric Precipitable Water from Reanalysis Products Using Homogenized Radiosonde Observations over China (76631)
Tianbao Zhao1, Juanhuai Wang1 and Aiguo Dai2, (1)Institute of Atmospheric Physics, Beijing, China, (2)University at Albany, State University of New York, Department of Atmospheric and Environmental Sciences, Albany, NY, United States
Long-term Trend of Cold Air Mass Amount below a Designated Potential Temperature in Northern and Southern Hemisphere Winters with 7 Different Reanalysis Datasets (71795)
Yuki Kanno, Muhammad Rais Abdillah and Toshiki Iwasaki, Tohoku University, Sendai, Japan
The statistical inhomogeneity of surface air temperature in global atmospheric reanalyses (85477)
Craig R Ferguson, University at Albany State University of New York, Albany, NY, United States and Min-Hee Lee, Seoul National University, Seoul, Korea, Republic of (South)

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