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Article

A Nowcast/Forecast System for Japan’s Coasts Using Daily Assimilation of Remote Sensing and In Situ Data

1
Application Laboratory, Japan Agency for Marine-Earth Science and Technology, Yokohama 236-0001, Japan
2
Earth Observation Research Center, Japan Aerospace Exploration Agency, Tsukuba 305-8505, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Andrea Storto
Remote Sens. 2021, 13(13), 2431; https://0-doi-org.brum.beds.ac.uk/10.3390/rs13132431
Received: 18 May 2021 / Revised: 8 June 2021 / Accepted: 14 June 2021 / Published: 22 June 2021
We have developed an ocean state nowcast/forecast system (JCOPE-T DA) that targets the coastal waters around Japan and assimilates daily remote sensing and in situ data. The ocean model component is developed based on the Princeton Ocean Model with a generalized sigma coordinate and calculates oceanic conditions with a 1/36-degree (2–3 km) resolution and an hourly result output interval. To effectively represent oceanic phenomena with a spatial scale smaller than 100 km, we adopted a data assimilation scheme that explicitly separates larger and smaller horizontal scales from satellite sea surface temperature data. Our model is updated daily through data assimilation using the latest available remote-sensing data. Here we validate the data assimilation products of JCOPE-T DA using various kinds of in situ observational data. This validation proves that the JCOPE-T DA model output outperforms those of a previous version of JCOPE-T, which is based on nudging the values of temperature and salinity toward those provided by a different coarse grid data-assimilated model JCOPE2M. Parameter sensitivity experiments show that the selection of horizontal scale separation parameters considerably affects the representation of sea surface temperature. Additional experiments demonstrate that the assimilation of daily-updated satellite sea surface temperature data actually improves the model’s efficiency in representing typhoon-induced disturbances of sea surface temperature on a time scale of a few days. Assimilation of additional in situ data, such as temperature/salinity/ocean current information, further improves the model’s ability to represent the ocean currents near the coast accurately. View Full-Text
Keywords: operational ocean state nowcast/forecast; daily-updated operation; remote sensing data; in situ data operational ocean state nowcast/forecast; daily-updated operation; remote sensing data; in situ data
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MDPI and ACS Style

Miyazawa, Y.; Varlamov, S.M.; Miyama, T.; Kurihara, Y.; Murakami, H.; Kachi, M. A Nowcast/Forecast System for Japan’s Coasts Using Daily Assimilation of Remote Sensing and In Situ Data. Remote Sens. 2021, 13, 2431. https://0-doi-org.brum.beds.ac.uk/10.3390/rs13132431

AMA Style

Miyazawa Y, Varlamov SM, Miyama T, Kurihara Y, Murakami H, Kachi M. A Nowcast/Forecast System for Japan’s Coasts Using Daily Assimilation of Remote Sensing and In Situ Data. Remote Sensing. 2021; 13(13):2431. https://0-doi-org.brum.beds.ac.uk/10.3390/rs13132431

Chicago/Turabian Style

Miyazawa, Yasumasa, Sergey M. Varlamov, Toru Miyama, Yukio Kurihara, Hiroshi Murakami, and Misako Kachi. 2021. "A Nowcast/Forecast System for Japan’s Coasts Using Daily Assimilation of Remote Sensing and In Situ Data" Remote Sensing 13, no. 13: 2431. https://0-doi-org.brum.beds.ac.uk/10.3390/rs13132431

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