The Intra-Seasonal Oscillation and its control of tropical cyclones simulated by high-resolution global atmospheric models
Year: 2011
Type: article
Abstract: Project Athena is an international collaboration testing the efficacy of high-resolution global climate models. We compare results from 7-km mesh experiments of the Nonhydrostatic Icosahedral Atmospheric Model (NICAM) and 10-km mesh experiments of the Integrated Forecast System (IFS), focusing on the Intra-Seasonal Oscillation (ISO) and its relationship with tropical cyclones (TC) among the boreal summer period (21 May–31 Aug) of 8 years (2001–2002, 2004–2009). In the first month of simulation, both models capture the intra-seasonal oscillatory behavior of the Indian monsoon similar to the observed boreal summer ISO in approximately half of the 8-year samples. The IFS simulates the NW–SE-oriented rainband and the westerly location better, while NICAM marginally reproduces mesoscale organized convective systems and better simulates the northward migration of the westerly peak and precipitation, particularly in 2006. The reproducibility of the evolution of MJO depends on the given year; IFS simulates the MJO signal well for 2002, while NICAM simulates it well for 2006. An empirical orthogonal function analysis shows that both models statistically reproduce MJO signals similar to observations, with slightly better phase speed reproduced by NICAM. Stronger TCs are simulated in NICAM than in IFS, and NICAM shows a wind-pressure relation for TCs closer to observations. TC cyclogenesis is active during MJO phases 3 and 4 in NICAM as in observations. The results show the potential of high-resolution global atmospheric models in reproducing some aspects of the relationship between MJO and TCs and the statistical behavior of TCs.
Source: Climate Dynamics
Authors: M. Satoh, K. Oouchi, T. Nasuno, H. Taniguchi, Y. Yamada, H. Tomita, C. Kodama, J. Kinter, D. Achuthavarier, J. Manganello, B. Cash, T. Jung, T. Palmer, N. Wedi
Institutions: Japan Agency for Marine-Earth Science and Technology, Atmosphere and Ocean Research Institute, The University of Tokyo, The University of Tokyo, University of Hawaiʻi at Mānoa, RIKEN, RIKEN Center for Computational Science, Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, European Centre for Medium-Range Weather Forecasts
Language: English
Subfield: Global and Planetary Change
Field: Environmental Science
Domain: Physical Sciences
SDG: Climate action
Open Access status: hybrid
Estimated APC paid: $3,790
Funders: National Science Foundation, National Aeronautics and Space Administration, Japan Science and Technology Corporation, Ministry of Education, Culture, Sports, Science and Technology, University of Tokyo, European Centre for Medium-Range Weather Forecasts, National Oceanic and Atmospheric Administration, Japan Society for the Promotion of Science, Japan Agency for Marine-Earth Science and Technology, RIKEN
Awards: THE PAST DECADE HAS WITNESSED MAJOR ADVANCES IN SPACE-BORNE REMOTE SENSING THAT HAVE REVOLUTIONIZED OUR ABILITY TO OBSERVE AND STUDY OCEANS ATMOSPHE, G5960338988, ENHANCEMENT OF DATA AND RESEARCH ACTIVITIES FOR CLIMATE STUDIES AT THE INTERNATIONAL PACIFIC RESEARCH CENTER (IPRC), A study on quasi-biweekly oscillation around Himalaya, Assam and Bangladesh regions
OpenAlex ID: W2090789167