日本地球惑星科学連合2019年大会

講演情報

[E] ポスター発表

セッション記号 A (大気水圏科学) » A-OS 海洋科学・海洋環境

[A-OS12] Marine ecosystems and biogeochemical cycles: theory, observation and modeling

2019年5月27日(月) 15:30 〜 17:00 ポスター会場 (幕張メッセ国際展示場 8ホール)

コンビーナ:伊藤 進一(東京大学大気海洋研究所)、平田 貴文(北海道大学地球環境科学研究院)、Enrique N Curchitser(Rutgers University New Brunswick)、Eileen E Hofmann(Old Dominion University)

[AOS12-P05] A high-resolution multi-purpose particle tracking framework for coastal areas near Japan

*松村 義正1桂 将太1黒木 聖夫2中野 英之3山岸 孝輝4 (1.東京大学 大気海洋研究所、2.海洋研究開発機構、3.気象庁気象研究所、4.高度情報科学技術研究機構)

キーワード:粒子追跡法

A comprehensive and multi-purpose particle tracking framework using latest high resolution velocity field in the coastal regions near Japan is developed.
The particle tracking system uses accurate fourth order Runge-Kutta method and implements random-walk based diffusivity, and is built-in the recent versions of MRI.com (an OGCM developed in Meteorological Research Institute, Japan Meteorological Agency) and kinaco (a non-hydrostatic ocean model developed in Atmosphere and Ocean Research Institute, University of Tokyo) for on-line use. Each particle is able to store up to seven arbitrary properties (such as size, age, exposed temperature, orientation, mass and buoyancy, etc.) and record the history of them.

The code is effectively parallelized (using MPI and OpenMP hybrid technique) and allows ~O(1010) particles on modern massive-parallel supercomputers, and is also ported to GPU architecture using CUDA language.

This particle tracking framework has no particular target in a priori, and can be applied to various purposes for both physical oceanography (from large scale tracking of water masses to small scale modeling of suspended sediment matter or frazil ice crystals) and ocean biogeochemistry (tracking of trace elements, Laglangian modeling of plankton and detritus, individual based modeling of fishes and marine resources), only by defining appropriate properties and inserting a few lines of code that manipulats them corresponding to the particular target use.

In the presentation, we will introduce an application of this framework to the tracking of passive particles scattered in the coastal areas near Japan using velocity field provided by the latest very high resolution ocean modeling (~300 m mesh). Each model particle records its trajectory and the history of exposed environment, and can be interpreted as eggs or larvae (before acquiring swimming ability) of species of corresponding spawning areas and seasons as well as the tracers for small scale water mass exchanges.