Ocean-atmosphere interactions: different chemical properties of organic matters and diversity of microorganism

• Main Author: Kim, Hyein
• Other Authors: Cho, Kyung Hwa
• Format: Master Thesis
• Language: English
• Published: Ulsan National Institute of Science and Technology 2023
• Subjects: Arctic; Arctic Ocean; Climate change; Phytoplankton
• Online Access: https://scholarworks.unist.ac.kr/handle/201301/65551; http://unist.dcollection.net/common/orgView/200000694454

Department of Urban and Environmental Engineering (Environmental Science and Engineering [Water-Energy Nexus]) The ocean is covered approximately 70 percent onto Earth???s surface which includes Dissolved Organic Matters (DOM) holds about 660 billion metric tons of carbon (Hansell and Orellana, 2021) and bacteria about that a liter of surface ocean is included over ten billion bacteria (Balloux and van Dorp, 2017). The ocean and atmosphere can interact directly and indirectly, this interaction can affect environmental pollution and climate change. In this study, DOM and microorganisms were identified on a global scale to confirm the interaction between the oceans and the atmosphere. In this study, study sites of the samples in ocean and atmosphere were collected in four cruises. In total, the samples in Sub-Arctic Ocean, the samples were taken during the Korean R/V Araon of cruise 1 during 4-17 July and cruise 3-4 from 19 September to 04 October 2022 (total 30 days), the distance of the four cruises was 12,931 km. It is aimed to investigate the interaction between ocean and atmosphere based on their chemical properties of DOM and abundance and diversity of bacteria. In the global ocean-atmosphere interaction, it was studied to identify and compare the characteristics of these sources of organic matters in detail, especially with analyzed results of orbitrap. In Cruise 1, lignin, a complex polymer, is predominantly aerosolized to the atmosphere in the form of Microbially produced Fluorescent Dissolved Organic Matter (FDOM) and Lipids, primarily derived from the total concentration of chlorophyll-a and phytoplankton, are the dominant component in the ocean In Cruise 2-4 The identification of DOM (Peak B???M???C) with higher biological impact reveals its origin from the ocean The abundance and diversity of bacteria were investigated along a transect same as sampling sites of DOM. The highest bacterial abundance was observed during Cruise 4, which suggests a potential microbial bloom (i.e., plankton bloom) leading ...