Influence of monsoon upwelling on pH off the southern coast of Java Island,Indonesia: a preliminary study

Xue Liang; Wang Huiwu; Wei Qinsheng; Li Laoyu; Yu Weidong

doi:10.3969/j.issn.0253-4193.2015.08.001

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Xue Liang, Wang Huiwu, Wei Qinsheng, Li Laoyu, Yu Weidong. Influence of monsoon upwelling on pH off the southern coast of Java Island,Indonesia: a preliminary study[J]. Haiyang Xuebao, 2015, 37(8): 1-8. doi: 10.3969/j.issn.0253-4193.2015.08.001

Citation:

Xue Liang, Wang Huiwu, Wei Qinsheng, Li Laoyu, Yu Weidong. Influence of monsoon upwelling on pH off the southern coast of Java Island,Indonesia: a preliminary study[J]. Haiyang Xuebao, 2015, 37(8): 1-8. doi: 10.3969/j.issn.0253-4193.2015.08.001

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Influence of monsoon upwelling on pH off the southern coast of Java Island,Indonesia: a preliminary study

doi: 10.3969/j.issn.0253-4193.2015.08.001

1.
Center for Ocean and Climate Research, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
2.
Marine Ecology Research Center, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China

Received Date: 2015-01-29
Rev Recd Date: 2015-05-01

Abstract

Abstract

pH and its influence by upwelling process off the southern coast of Java Island, Indonesia were examined for the first time using carbonate and related hydrographic data collected from late September to early October 2013. We found that sea surface pH was lower in the upwelling area than in the nearby nonupwelling area. A two end-member mixing model was used to separate the two opposite effects of the upwelling process on pH: physical transport of CO₂ rich waters from subsurface layers vs. biological production. Results showed that physical transport at least led to a dissolved inorganic carbon (DIC) increase of 110 μmol/kg, and a pH decrease of about 0.2 units, while strong biological production (chlorophyll a level above 0.4 mg/m³) induced a DIC decrease by up to 70 μmol/kg, and a pH increase by up to 0.15 units. Overall, the physical transport of CO₂ rich waters was dominant, leading to a net decrease in pH. Also, we found that surface cooling and salinity increases induced by the upwelling played a relatively minor role in affecting pH (thermodynamically), compared with effects of physical transport and subsequent biological production associated with the upwelling.
- pH,
- eastern boundary upwelling,
- biological activity,
- physical transport,
- South Java,
- Indian Ocean

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