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Hypoxic Bottom Waters as a Carbon Source to Atmosphere During a Typhoon Passage Over the East China Sea
Author(s) -
Li Dewang,
Chen Jianfang,
Ni Xiaobo,
Wang Kui,
Zeng Dingyong,
Wang Bin,
Huang Daji,
Cai WeiJun
Publication year - 2019
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2019gl083933
Subject(s) - typhoon , plume , environmental science , oceanography , flux (metallurgy) , china sea , entrainment (biomusicology) , carbon dioxide , seawater , atmosphere (unit) , climatology , mooring , wind speed , atmospheric sciences , geology , meteorology , chemistry , geography , philosophy , organic chemistry , rhythm , aesthetics
A high‐resolution mooring record from the Changjiang River plume (45‐m depth) is used to investigate how air‐sea CO 2 flux responds to typhoon in the productive plume. With strong wind, surface partial pressure of carbon dioxide ( p CO 2 ) increased sharply from 369 to 606 μatm due to entrainment of high‐CO 2 subsurface water. Though it was followed by p CO 2 decrease of 250 μatm and Chl a increase days after the typhoon, the typhoon caused a net CO 2 efflux overall. The maximum CO 2 efflux (+111.6 mmol·m −2 ·day −1 ) is much greater than that under non‐typhoon condition (−2.3 to −11.7 mmol·m −2 ·day −1 ). Based on historical typhoon records, we estimate typhoon‐induced CO 2 efflux to be +0.27 Tg C/year, which can cancel 18% of summer CO 2 influx in the East China Sea shelf. It may likely occur in other coastal waters. Ignoring such contribution may induce large bias in estimating regional air‐sea CO 2 flux.