In:
Limnology and Oceanography, Wiley, Vol. 66, No. 3 ( 2021-03), p. 588-606
Abstract:
Carbon dioxide partial pressure ( p CO 2 ) in surface water was continuously measured every 3 h from July 2012 to June 2013 using an autonomous p CO 2 system (MAPCO 2 ) deployed on a moored buoy on the East China Sea shelf (31°N, 124.5°E). Sea surface p CO 2 and pH had the largest variations in summer, ranging from 215 to 470 μ atm, and 7.941 to 8.263 (averagely 8.084 ± 0.080), respectively. They varied little in winter, ranging from 328 to 395 μ atm, and 8.003 to 8.074 (averagely 8.052 ± 0.010), respectively. The seasonal average sea surface p CO 2 was respectively 335 ± 70 μ atm, 422 ± 43 μ atm, 362 ± 11 μ atm, and 311 ± 59 μ atm in summer, autumn, winter, and spring, and was overall undersaturated with respect to atmosphere on a yearly basis. Although the average sea surface p CO 2 in summer was below the atmospheric level, the net CO 2 flux has suggested a CO 2 source status due to the influence of typhoon. Our observation thus demonstrated the significant, even dominant impact of episodic typhoon events on surface ocean CO 2 chemistry and air–sea CO 2 gas exchange, which would be impossible to capture by shipboard observation. The high wind stress and curl associated with the northward movement of typhoon induced complex sea surface water movement, vertical mixing, and subsequent biological drawdown, which differed in pre‐, onset, and post‐typhoon stages. Based on our estimates, the degassing fluxes during typhoon reached as high as 82 mmol m −2 CO 2 and 242 mmol m −2 CO 2 in summer and autumn, respectively, accounting for twice as large as the summer CO 2 sink during non‐typhoon period, and 28% of the total CO 2 source in autumn.
Type of Medium:
Online Resource
ISSN:
0024-3590
,
1939-5590
Language:
English
Publisher:
Wiley
Publication Date:
2021
detail.hit.zdb_id:
2033191-5
detail.hit.zdb_id:
412737-7
SSG:
12
SSG:
14
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