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Title: High-resolution mapping and time-series measurements of 222Rn concentrations and biogeochemical properties related to submarine groundwater discharge along the coast of Obama Bay, a semi-enclosed sea in Japan
Authors: Kobayashi, Shiho  kyouindb  KAKEN_id
Sugimoto, Ryo
Honda, Hisami
Miyata, Yoji
Tahara, Daisuke
Tominaga, Osamu
Shoji, Jun
Yamada, Makoto
Nakada, Satoshi
Taniguchi, Makoto
Author's alias: 小林, 志保
杉本, 亮
本田, 尚美
宮田, 洋実
田原, 大輔
富永, 修
小路, 淳
山田, 誠
中田, 聡史
谷口, 真人
Keywords: Submarine groundwater discharge (SGD)
222Rn monitoring
Wind-driven advection
Coastal seas
Issue Date: 24-Mar-2017
Publisher: Springer Science and Business Media LLC
Journal title: Progress in Earth and Planetary Science
Volume: 4
Thesis number: 6
Abstract: High-resolution mapping along the coast and time-series measurements of the radon-222 (222Rn) concentrations in the shallow zone in a semi-enclosed sea, Obama Bay, Japan, were undertaken in 2013. The temporal and spatial variations in the 222Rn concentrations were analyzed in parallel with meteorological conditions, physical–biogeochemical characteristics, and the submarine groundwater discharge (SGD) flux measured with a seepage meter. These data indicate that the groundwater influences the water properties of the bay and that the groundwater supply pathways are not limited to the local SGD. The concentrations of 222Rn flowing into the bay from rivers was known to be relatively high because groundwater seeps from the river bed. High-222Rn water was almost always present around the river mouth, and northward advection of the water affected the distribution of 222Rn concentrations in the bay. The southward wind suppressed the advection of the high-222Rn water and largely controlled the temporal variations in 222Rn concentrations at a station located on the north side of the river mouth, whereas the local SGD affected the short-term changes in the 222Rn concentrations. The concentrations of 222Rn and chlorophyll-a, an indicator of phytoplankton biomass, show a significant positive correlation in the surface layer along the coastline in seasons when the nutrient supply was the main factor limiting primary productivity.
Rights: © The Author(s). 2017
This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
DOI(Published Version): 10.1186/s40645-017-0124-y
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