CSIR-National Institute of Oceanography, Dona Paula, Goa, India; School of Earth, Ocean and Atmospheric Sciences, Goa University, Taleigao Plateau, Goa, India.
CSIR-National Institute of Oceanography, Dona Paula, Goa, India.
Mar Environ Res. 2020 May;157:104926. doi: 10.1016/j.marenvres.2020.104926. Epub 2020 Feb 26.
Seasonal hypoxia/suboxia (at times anoxia) towards the end of Southwest monsoon (SWM; June to September) at the coastal time series site off Goa, West coast of India was found to influence the dynamics of phytoplankton biomass, community structure and production of climatically active gas, dimethylsulphide (DMS). In this diatom dominated study region, high DMS production in the subsurface waters during late SWM might possible be attributed to the stress experienced by micro- and macro-algae from the prevailing low oxygen subsurface waters through different pathways specifically believed to be via methylation pathway (see Schafer et al., 2010). Based on laboratory experiments, we hypothesize presence of floating seaweeds mostly Sargassum species washed from the shore to the study site to contribute sizably to DMS production in the water column as they sink and degrade during the senescence phase. However, we are yet to address its loss/emission processes across the oxic-hypoxic boundary of seasonal (and permanent) oxygen minimum zone of the northern Indian Ocean, which is important from the viewpoint of global climate change.
在印度西海岸果阿沿海时间序列站点，西南季风（SWM；6 月至 9 月）末期的季节性低氧/缺氧（有时为缺氧）会影响浮游植物生物量、群落结构和气候活性气体二甲基硫（DMS）的产生。在这个以硅藻为主的研究区域，在 SWM 后期，次表层水中的高 DMS 产量可能归因于微藻和宏观藻类在低氧次表层水中经历的压力，这是通过不同途径，特别是通过甲基化途径（见 Schafer 等人，2010 年）。基于实验室实验，我们假设从岸边冲到研究地点的漂浮海藻（主要是马尾藻属物种）在下沉和衰老过程中会大量贡献 DMS 产量。然而，我们尚未解决其在北印度洋季节性（和永久性）氧气最小区的含氧-缺氧边界的损失/排放过程，从全球气候变化的角度来看，这一点很重要。
