海洋科学2023，Vol.47Issue(11)：45-56,12.DOI:10.11759/hykx20230426001
亚热带珊瑚礁海域枯水季pCO2的分布特征及CO2汇源转换机制——以深圳杨梅坑海域为例
Distribution characteristics of pCO2 and source-sink conver-sion mechanism of CO2 in a subtropical coral reef water dur-ing the dry season:A case study of the Yangmeikeng Sea area in Shenzhen,China
摘要
Abstract
Due to the extremely high primary production and efficient carbon metabolism rate,the sink/source proper-ties of carbon dioxide(CO2)in coral reef waters are still controversial.This study aims to explore the distribution characteristics of the seawater partial pressure of carbon dioxide(pCO2)and its main control mechanisms in a typical subtropical coral reef during the dry season based on field surveys conducted in the Yangmeikeng Sea area of Shenzhen,China in November 2022(autumn)and February 2023(winter)and the data obtained from indoor culture experiments.The investigation reveals a significant pCO2 variation that ranges from 233.3 to 465.3 μatm.In autumn,the study area acts as a sink for atmospheric CO2,yielding an absorption flux of 1.66±0.41 mmol C/m2/day.Con-versely,in winter,it is a weak source of atmospheric CO2,depicting an emission flux of 0.65±0.14 mmol C/m2/day.The Yangmeikeng Sea area notably experiences minimal influence from the freshwater input.The biological process under the seasonal temperature influence is the key factor driving the seasonal variation of pCO2,which contributes 73.6％(surface)and 66.5％(bottom)of the total variation.The seasonal difference of the phytoplankton photosynthe-sis is the main cause of the seawater CO2 transformation from sink to source,while the effect of the microbial respira-tion is weak.In comparison,physical processes,such as the sea-air exchange of CO2 and the temperature and salinity changes,have a weaker effect on the pCO2 dynamic than that of biological processes.The metabolic activity of corals also has a noteworthy impact on the pCO2 distribution in the local sea area of Yangmeikeng,resulting in a higher pCO2 value in the reef area than in the non-reef area.Thus,the influence of the coral metabolism in the local sea area cannot be ignored when estimating the air-sea CO2 flux.关键词
珊瑚礁/CO2分压/海气CO2通量/源汇特征/杨梅坑海域Key words
coral reefs/CO2 partial pressure/air-sea CO2 flux/source-sink characteristics/Yangmeikeng sea area分类
海洋科学引用本文复制引用
张卓,杨波,崔洲平,林子燚,谢子强,郑惠娜,廖宝林,肖宝华,朱春华..亚热带珊瑚礁海域枯水季pCO2的分布特征及CO2汇源转换机制——以深圳杨梅坑海域为例[J].海洋科学,2023,47(11):45-56,12.基金项目
深圳市可持续发展专项(KCXFZ20211020165547011) （KCXFZ20211020165547011）
中国博士后科学基金资助项目(2022M721792) （2022M721792）
广东省基础与应用基础研究基金资助项目(2023A1515012204) （2023A1515012204）
广东省基础与应用基础研究基金资助项目(2022A1515110345)Sustainable Development Project of Shenzhen,No.KCXFZ 20211020165547011 （2022A1515110345）
General Project of China Postdoctoral Fund,No.2022M721792 （）
Guangdong Basic and Applied Basic Research Foundation,No.2023A1515012204 （）
Guangdong Basic and Applied Basic Research Foundation,No.2022A1515110345 （）
