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What is NICAM?

NICAM is a Nonhydrostatic ICosahedral Atmospheric Model (NICAM), used as a Global Cloud Resolving Model (GCRM). A 3.5km-mesh global simulation is already performed using the Earth Simulator. NICAM is first developed by H.Tomita (FRCGC, JAMSTEC) and M.Satoh, and is now under development in cooperation with CCSR and JAMSTEC. Introduction papers of NICAM are Satoh et al. (2014, PEPS), Satoh et al.(2008, J.Comp. Physics). Miura et al. (2007, Science) shows a realistic MJO simulation (14 Dec. 2007). NICAM is also referred to in the article of Science (Kerr, 2006) . NICAM is also used as a low-resolution Atmospheric General Circulation Model (AGCM), and as a regional cloud resolving model based on stretched grids (Stretch-NICAM). Examples of use of these low resolution and regional models can be seen in nicam nwp exp. NICAM is selected as one of the target applications of next-generation supercomputer (reference). See RIKEN Next-generation supercomputer R&D Center for detail. See also current status of NICAM by UCLA NEWSLETTER (No. 87).


Tropical cyclones SINLAKU and IKE reproduced by NICAM 7km simulation (00UTC 13 Sep. 2008) (by H.L. Tanaka) cloud_global2008091300.jpgcloud_global2008091300-1280.jpg; n20080908w.wmv
An Madden-Julian Oscillation event simulated using a global cloud-resolving model. (Miura et al. 2007; OLR ; left: MTSAT-1R, right: NICAM 3.5km) mjo.jpg
Aqua Planet Experiment OLR (by H.Tomita)olr_aqua-planet.jpg

Experimental Monitoring of Madden-Julian Oscillation (MJO)

For MJO research by NICAM, MJO is monitored every day by two types of MJO index. One is the index by Wheeler and Hendon (2004) produced by Bureau of Meteorology Research Center (Australia) / An All-season Real-time Multivariate MJO Index. The other is an index defined by projection of the band passed-filtered daily anomaly data of velocity potential at 200-hPa (CHI200) in JRA-25/JCDAS produced by Japan Meteorological Agency (JMA) and Central Research Institute of Electric Power Industry (CRIEPI) onto its EOFs. Raw climatology data of CHI200 is made by each daily averaged data from 1 April 1979 to 31 December 2008 and its 60 days low-passed filtered version is used as climatology data. Anomalies dataset of CHI200 from the climatology is bandpass-filtered by 30-90 days. The principal and second modes of empirical orthogonal function (EOFs) of 30-90 days filtered CHI200 anomalies data are used to define the cycle of the MJO. Both of the indices are opened in the page of MJO index.

Last modified:2015/04/28 13:56:17