Different responses of chlorophyll a to the passage of the tropical storm Wipha (2019) in the coastal waters of the northern Beibu Gulf

Chen, Y., Ren, C., Feng, Y., Shi, H., Pan, G. ORCID: 0000-0003-0920-3018, Cooper, M. ORCID: 0000-0002-1864-1434 and Zhao, H., 2022. Different responses of chlorophyll a to the passage of the tropical storm Wipha (2019) in the coastal waters of the northern Beibu Gulf. Frontiers in Marine Science, 9: 887240. ISSN 2296-7745

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Tropical storms (TS) are important drivers of short-term changes and affects the coastal and marine environment. Based on in situ observational data from four locations in the coastal area of the northern Beibu Gulf and satellite data, we analyzed the changes in temperature, salinity, and turbidity during the transit of TS “Wipha” in 2019 and assessed the environmental factors controlling chlorophyll a concenteation (Chl-a) increases in the coastal area. Our results showed that in the coastal area, the growth of phytoplankton after the TS was mainly controlled by the nutrient and light availability. The increased input of freshwater by TS, including direct inputs from rainfall and increased river discharge, reduced the salinity. The decrease in salinity may indicate an increased input of nutrient-rich freshwater at all four stations (nutrients input: S1>S2>S3>S4). Nutrient concentration at S1, S2, and S3 implied by salinity was high, but that at S4 was limited. The shorter recovery time of turbidity after TS indicated the faster improvement of light conditions in this area [recovery time: S4 (2 days)< S1 (3 days)< S3 (5 days)< S2 (10 days)]. The high turbidity associated with poor light penetration was an important factor limiting phytoplankton growth at station 2, with a slow recovery of the turbidity to pre-TS levels. The rapid recovery of the turbidity to the pre-TS levels at S1, S3, and S4 suggested good light conditions soon after the TS, and probably led to a significant increase in Chl-a after the TS ([Chl-a]: S1>S3>S4). The less of an increase of Chl-a at S4 was not only related to nutrient restriction but also related to weak mixing of the water column, while the least significant decrease in the SST at S4 implied that the enhancing mixing after TS was limited.

Item Type: Journal article
Publication Title: Frontiers in Marine Science
Creators: Chen, Y., Ren, C., Feng, Y., Shi, H., Pan, G., Cooper, M. and Zhao, H.
Publisher: Frontiers Media SA
Date: 24 June 2022
Volume: 9
ISSN: 2296-7745
Rights: © 2022 Chen, Ren, Feng, Shi, Pan, Cooper and Zhao. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
Divisions: Schools > School of Animal, Rural and Environmental Sciences
Record created by: Laura Ward
Date Added: 29 Jun 2022 14:22
Last Modified: 29 Jun 2022 14:22
URI: https://irep.ntu.ac.uk/id/eprint/46518

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