2020年1月，我研究组博士研究生Faisal Hamzah等在地学顶级期刊Journal of Geophysical Research: Oceans发表题为Dynamics of the Carbonate System in the Western Indonesian Seas During the Southeast Monsoon的研究论文，首次产出了该海域首批高质量的海洋碳酸盐系统数据，较为系统研究了印尼海和印尼贯穿流碳酸盐系统的动力学过程。
基于2015年在印尼西部海域所获数据，本研究探讨了印尼海西部海域复杂水团共同调控下的碳酸盐系统的分布、动态变化规律及其控制机制，并发现巽他海峡是印尼西部环流的主要外流通道之一。
Figure:Biologically-mediated DIC variations represented by ΔDIC (a) and ΔpH and ΔΩarag(b) in the surface mixed layer (upper 40 m) of the Sunda Strait. (c) Dissolved oxygen saturation (DO%) in the upper 40 m of the western Indonesian Seas during the southeast monsoon of June 2015. Grey dashed lines in panels (a) and (b) denote no net change in ΔDIC, ΔpH, and ΔΩaragdue to equal amounts of addition and removal, and in panel (c) denotes DO% = 100% with equilibrium reached between the sea surface and the atmosphere.
The Indonesian Seas are the onlylow-latitude interbasinpathway; known as the Indonesian throughflow (ITF), they are an essential component of the earth’s climate system.As part of thermohaline circulation, the ITF has received much attention, largely due to its vitally important role in the transport of mass, heat, and freshwater.However, the general biogeochemistry of the Indonesian Seas and their role in the global carbon cycle remain largely unknown, despite emerging research efforts across multiple fields. This knowledge gap is in striking contrast to the importance of the Indonesian Seas to global marine ecosystems. Understanding the dynamics of the carbonate system in this region is a prerequisite to meet the challenges of this vulnerable ecosystem and similar coastal tropical environments under ongoing ocean warming and acidification.
We present a unique dataset to examine thedynamics of the carbonate systeminthewestern IndonesianSeasduringthesoutheast monsoon, coveringthe Karimata Strait, westernJava Sea,and Sunda Strait.Salinity-normalized total alkalinity (NTAlk) in the surface water is very close to typical values observed in the tropical ocean.In the westernJava Sea,wherewaters were well mixed,we observedrelatively homogeneous distributions of salinity,dissolved inorganic carbon (DIC), andtotal alkalinity (TAlk). In the Sunda Strait, watersintrudingfrom the Java Sea occupied the upper layer,and below was theIndian Ocean waterwithlower values of salinity,DIC, and TAlk.In its deep portion, depth profiles of NDIC and NTAlk were very similar to those observed in the IndianOcean.
Based onDIC and TAlkrelationships,weshow that water mass mixing inthewestern IndonesianSeas duringthesoutheast monsoonis dominatedby zonal wind-mixed waters fromtheplume of the Kapuas River,theJava SeaandSouth China Seamixed waterandthesubsurface Indian Oceanwater.Physical processes and air-sea gas exchange exerted predominant controlson the carbonate system in the Karimata Strait and western Java Sea,whilebiologically-mediated DIC consumption occurred in the surface mixed layer of the Sunda Strait, whichled to anincreaseindissolved oxygen saturation,thesaturation state of aragonite (Ωarag), and pH. Overall our region was a source of atmospheric CO2as previously reported, although the controlling processesmay vary with respect to time at both seasonal and interannual time scales.
Citation:
Hamzah, F., Agustiadi, T., Susanto, R. D., Wei, Z., Guo, L., Cao, Z., & Dai, M. ,2020. Dynamics of the Carbonate System in the Western Indonesian Seas During the Southeast Monsoon. Journal of Geophysical Research: Oceans, 125, e2018JC014912. https://doi.org/10.1029/2018JC014912
Further reading please check through:https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2018JC014912
