Change in the physical properties associated with Intraseasonal Oscillation in East Asia during summer
Abstract
The precipitation variability in East Asia during boreal summer (June-July-August) is significantly associated with the northward Intraseasonal oscillation originated from the Indian Ocean and tropical Pacific, respectively. This study examined the changes in the physical properties associated with Intraseasonal oscillation in East Asia for 1991-2010 during summer in terms of its interactions with tropical Oceans. The data used in this study was European Centre for Medium-Range Weather Forecasts(ECMWF) daily dataset including precipitation, SST, and heat fluxes. It is found that the first three EOF modes of precipitation, which indicate the intraseasonal oscillation, well represent the temporal and spatial variability of precipitation in East Asia during summer. It is further found that a lead-lag relationship between the first two EOF modes of precipitation along with their spatial structure is quite different in years when the precipitation amount in East Asia is much and less, respectively. In addition, the characteristic of atmosphere-ocean interactions in the western tropical Pacific, which are associated with the Intraseasonal oscillation in East Asia, is changed in the recent past.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFM.A41L3126N
- Keywords:
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- 3337 Global climate models;
- ATMOSPHERIC PROCESSESDE: 0550 Model verification and validation;
- COMPUTATIONAL GEOPHYSICSDE: 1817 Extreme events;
- HYDROLOGYDE: 4341 Early warning systems;
- NATURAL HAZARDS