Shulou(Shulou.com)11/24 Report--

Thank you, Mr. Air, a netizen of CTOnews.com, for your clue delivery! CTOnews.com news on December 7, learned from the official website of the Institute of Oceanography of the Chinese Academy of Sciences, the scientific research team of the institute successfully developed the first international deep-sea multi-channel Raman spectroscopy detection system (Multi-channel Raman insertion probes system, Multi-RiPs), and successfully built a deep-sea in-situ spectroscopy laboratory in the cold spring area of the South China Sea.

The probe deep-sea laser Raman spectroscopy detection system developed by the research team has been routinely applied to deep-sea sediment pore water, cold spring and hydrothermal vent fluid, chemical energy synthesis biological community internal fluid, natural gas hydrate and in-situ detection and quantitative analysis of rocks and minerals near cold spring and hydrothermal vent system. However, with the in-depth study of deep-sea hydrothermal and cold spring systems, scientists gradually realize that deep-sea hydrothermal or cold spring systems are an organic and unified whole, and cold springs and hydrothermal activities have strong inhomogeneity in time and space. The detection of existing deep-sea in-situ Raman spectrometers is short-term instantaneous and relatively independent, so it is difficult to capture the dynamic laws and potential relationships between different targets in highly dynamic and inhomogeneous environments such as cold springs and hydrothermal systems.

For this reason, the research team developed the first deep-sea multi-channel Raman spectrum detection system (Multi-channel Raman insertion probes system, Multi-RiPs) in the world, developed optical path switching technology, and realized the time-sharing multiplexing of major optical devices (such as lasers, spectrometers, photoelectric sensors, etc.) (as shown in figure 1), combined with serialized Raman spectrum probes. The long-term in-situ monitoring of different phase targets such as fluid, solid and gas in the deep-sea hydrothermal (figure 2) and cold spring (figure 3) system is realized.

Fig. 1 layout of key optical components in multi-channel Raman spectrum detection system

Fig. 2 schematic diagram of in-situ experiment and long-term continuous detection of multi-targets carried out by Mulit-RiPs with LOOP in hydrothermal region

Fig. 3 Mulit-RiPs carrying LOOP carries out in-situ experiments and long-term continuous detection of multi-targets in the cold spring area. CTOnews.com understands that in order to determine the conversion channel of methane near the deep-sea cold spring vents and the methane release flux in the cold spring area. The research team used the deep-sea multi-channel Raman spectrum detection system and the deep-sea sitting bottom long-term observation system (Long-term ocean observation platform, LOOP) to be placed in the cold spring area of southwestern Taiwan in the northern part of the South China Sea in 2020, 2021 and 2022 (figure 4). The main components of cold spring vent fluid, the coupling process of natural gas hydrate and deep-sea environment, long-term in-situ detection and field experiment of methane oxidation process in cold spring biological community have been realized, and the first international deep-sea in-situ spectroscopy laboratory has been successfully built. and normal operation in deep-sea cold springs, hydrothermal and other areas.

Fig. 4 Mulit-RiPs carrying LOOP for three consecutive years (aRover 2020; BRV 2021; CRAV 2022)

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