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Characteristics of the surface water DMS and p CO 2 distributions and their relationships in the Southern Ocean, southeast Indian Ocean, and northwest Pacific Ocean
Author(s) -
Zhang Miming,
Marandino C. A.,
Chen Liqi,
Sun Heng,
Gao Zhongyong,
Park Keyhong,
Kim Intae,
Yang Bo,
Zhu Tingting,
Yan Jinpei,
Wang Jianjun
Publication year - 2017
Publication title -
global biogeochemical cycles
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.512
H-Index - 187
eISSN - 1944-9224
pISSN - 0886-6236
DOI - 10.1002/2017gb005637
Subject(s) - seawater , oceanography , surface water , dimethyl sulfide , carbon dioxide , environmental science , pacific ocean , atmosphere (unit) , sea surface temperature , sea ice , geology , sulfur , chemistry , geography , meteorology , organic chemistry , environmental engineering
Oceanic dimethyl sulfide (DMS) is of interest due to its critical influence on atmospheric sulfur compounds in the marine atmosphere and its hypothesized significant role in global climate. High‐resolution shipboard underway measurements of surface seawater DMS and the partial pressure of carbon dioxide ( p CO 2 ) were conducted in the Atlantic Ocean and Indian Ocean sectors of the Southern Ocean (SO), the southeast Indian Ocean, and the northwest Pacific Ocean from February to April 2014 during the 30th Chinese Antarctic Research Expedition. The SO, particularly in the region south of 58°S, had the highest mean surface seawater DMS concentration of 4.1 ± 8.3 nM (ranged from 0.1 to 73.2 nM) and lowest mean seawater p CO 2 level of 337 ± 50 μatm (ranged from 221 to 411 μatm) over the entire cruise. Significant variations of surface seawater DMS and p CO 2 in the seasonal ice zone (SIZ) of SO were observed, which are mainly controlled by biological process and sea ice activity. We found a significant negative relationship between DMS and p CO 2 in the SO SIZ using 0.1° resolution, [DMS] seawater = −0.160 [ p CO 2 ] seawater + 61.3 ( r 2 = 0.594, n = 924, p < 0.001). We anticipate that the relationship may possibly be utilized to reconstruct the surface seawater DMS climatology in the SO SIZ. Further studies are necessary to improve the universality of this approach.