In-situ observation method for methane macro leakage strength of sediment-water interface in cold spring area

Abstract

The invention discloses an in-situ observation method for the methane macro leakage strength of a sediment-water interface in a cold spring area. The in-situ observation method comprises the following steps that: comprehensive observation data of a cold spring water body are obtained through a cold spring observation device; a background vertical flow velocity is obtained through a background observation device, the cold spring fluid eruption velocity is corrected, and a cold spring fluid eruption velocity time sequence is obtained; the methane concentration obtained by a multi-range sensor in the cold spring observation device is smoothed, and a smoothed methane concentration time sequence within the time is obtained; the area of a cold spring nozzle is estimated through the cold spring observation device, and the methane leakage flux is calculated in combination with the cold spring fluid eruption velocity time sequence and the methane concentration time sequence. According to the invention, the simple combination of common ocean observation equipment is utilized to synchronously observe the seabed methane concentration and ocean dynamic environment elements in the cold spring region, so as to achieve the purpose of exploring the time evolution rule of the sediment-water interface methane macro leakage flux in the cold spring region.

Description

technical field [0001] The invention relates to the technical field of marine detection, in particular to an in-situ observation method for methane macro-seepage intensity at the sediment-water interface in a cold spring area. Background technique [0002] Submarine cold seeps are an important natural source of methane in the ocean and atmosphere, and their methane macroseepage activities at the sediment-water interface have extremely strong temporal variability. Therefore, it is of great significance to understand the temporal variation of methane seepage intensity at the sediment-water interface in cold seeps and its driving mechanism for the study of global carbon cycle and climate effects. At present, two commonly used observation methods for methane seepage intensity at the sediment-water interface have been proposed internationally: ① in-situ observation of fluid seepage rate combined with indoor methane concentration analysis, and ② continuous sampling of benthic flui...

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Problems solved by technology

[0003] In order to overcome the deficiencies of the prior art, the object of the present invention is to provide a method for in-situ observation of the methane macro-seepage intensity at the sediment-water interface in the cold spring area, which can solve the lack of methane seepage in the prior art by using a simple cold spring observation device. Accurate observation of leakage intensity temporal variation and methane macro-seepage flux cannot support the research on the driving mechanism of methane leakage intensity temporal variation

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