Details

Autor(en) / Beteiligte

• Li, Yunxiao
• Xue, Liang
• Yang, Xufeng
• Wei, Qinsheng
• Xin, Ming
• Xue, Ming
• Han, Chenhua
• Han, Ping
• Liu, Xiangyu
• Zang, Han
• Yang, Pengjin
• Ran, Xiangbin
• Cao, Lu
• Cai, Wei-Jun
• Zhang, Longjun

Titel

Wastewater inputs reduce the CO 2 uptake by coastal oceans

Ist Teil von

• The Science of the total environment, 2023-07, p.165700

Ort / Verlag

Netherlands

Erscheinungsjahr

2023

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Every year a large quantity of wastewater is generated worldwide, but its influence on the carbon dioxide (CO ) uptake by coastal oceans is not well understood. Here, sea surface CO partial pressure (pCO ) and air-sea CO flux were examined in the Jiaozhou Bay (JZB), a temperate coastal bay strongly disturbed by wastewater inputs. Monthly surveys from April 2014 through March 2015 showed that surface pCO in the JZB substantially varied both temporally and spatially between 163 μatm and 1222 μatm, with an annual average of 573 μatm. During April-December, surface pCO was oversaturated with respect to the atmosphere, with high values exceeding 1000 μatm in the northeastern part of the bay, where seawater salinity was low mainly due to the inputs of wastewater with salinity close to zero. During January-March, surface pCO was undersaturated, with the lowest value of <200 μatm also mainly in the northeastern part because of low water temperature and strong biological production. Over an annual cycle, apparently sea surface temperature dominated the monthly variation of surface pCO in this shallow bay, while wastewater inputs and related biological production/respiration dominated its spatial variability. Overall, the JZB was a net CO source to the atmosphere, emitting 9.6 ± 10.8 mmol C m d , unlike its adjacent western part of the Yellow Sea and most of the temperate coastal oceans which are a net CO sink. This was possibly associated with wastewater inputs that cause high sea surface pCO via direct inputs of CO and degradation of organic matter. Thus, from this viewpoint reducing wastewater discharge or lowering CO levels in discharged wastewater may be important paths to enhancing the CO uptake by coastal oceans in the future.