Ấn phẩm:
A long-term dataset of in-situ temperature data reveals wind-induced up- and downwelling in the coastal waters of Nha Trang, South Central Vietnam
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Tóm tắt
In this paper, the first long-term observation (2008–2019) of temperatures, not only from SST data, but also in situ in coral reefs (10 and 18 m depth) at Nha Trang Bay, South Central Vietnam, was investigated. The data showed that wind-induced upwelling during summer mainly govern the coastal region. In contrast, wind-induced downwelling was found during winter, visible in all three investigated water layers (SST, 10 and 18 m). In winter, the vertical mixing is strong and there is virtually no time-lag between the layers. In summer a scattering layer was formed, the phenomenon where a layer of water with different properties (such as temperature or salinity) is formed, blocking the sinking of water. In summer, correlations with air temperature were not significant, nor were correlations with night cooling, thus having implications for the distribution of nutrients and the health of the coral reefs. However, this was only the situation near the coast. Wavelet analysis shows that the short-term variability is significantly more substantial, caused by the shallow depth of the thermocline, which is much stronger affected by tidal and weather events than in winter. As a result of the combination of large yearly temperature variations (21 oC to 31oC) plus increased sediment deposition in the rainy seasons, reefs close to the shore are generally not well-developed. This paper strongly advocates for science-based monitoring of coral reef conditions and underscores the need for law enforcement within the Marine Protected Area of Nha Trang Bay.
Mô tả
Vietnam Journal of Marine Science and Technology, Vol. 24, No. 4
Tác giả
Andreas, Kunzmann
Hoang, Trung Du
David, Brefeld
Sina, Pinter
Thomas, Pohlmann
Người hướng dẫn
Nơi xuất bản
Nhà xuất bản
Viện Hàn lâm Khoa học và Công nghệ Việt Nam
Năm xuất bản
2024-12
ISSN tạp chí
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Từ khóa chủ đề
Coastal oceanography , Temperature , Sediment deposition , River runoff , Corals