https://repository.kopri.re.kr/handle/201206/12125 2026-04-05T23:07:04Z https://repository.kopri.re.kr/handle/201206/13328 Title: Carbon response of tundra ecosystems to advancing greenup and snowmelt in Alaska Authors: Kim, JiHyun; Kim, Yeonjoo; Zona, Donatella; Oechel, Walter; Park, Sang-Jong; Lee, Bang Yong; Yi, Yonghong; Erb, Angela; Schaaf, Crystal L. Abstract: The ongoing disproportionate increases in temperature and precipitation over the Arctic region may greatly alter the latitudinal gradients in greenup and snowmelt timings as well as associated carbon dynamics of tundra ecosystems. Here we use remotely-sensed and ground-based datasets and model results embedding snowmelt timing in phenology at seven tundra flux tower sites in Alaska during 2001-2018, showing that the carbon response to early greenup or delayed snowmelt varies greatly depending upon local climatic limits. Increases in net ecosystem productivity (NEP) due to early greenup were amplified at the higher latitudes where temperature and water strongly colimit vegetation growth, while NEP decreases due to delayed snowmelt were alleviated by a relief of water stress. Given the high likelihood of more frequent delayed snowmelt at higher latitudes, this study highlights the importance of understanding the role of snowmelt timing in vegetation growth and terrestrial carbon cycles across warming Arctic ecosystems. The ongoing disproportionate increases in temperature and precipitation in the Alaska may alter the latitudinal gradients in greenup and snowmelt timings as well as carbon dynamics. With a broad range of datasets and model results, the authors show that the carbon response to early greenup or delayed snowmelt varies greatly depending upon local climatic limits. 2021-11-25T00:00:00Z https://repository.kopri.re.kr/handle/201206/10914 Title: Optimization of suspect and non-target analytical methods using GC/TOF for prioritization of emerging contaminants in the Arctic environment Authors: Lee, Sunggyu; Kim, Kitae; Jeon, Junho; Moon, Hyo-Bang Abstract: Numerous chemicals have been manufactured through industrial activities and used as consumer products since the late 18th century. Non-target analysis is a new analytical tool to detect many chemicals in environmental samples and to prioritize emerging contaminants. In this study, suspect and non-target analytical methods were optimized using gas chromatography coupled with time-of-flight (GC/TOF) to propose contaminants of emerging concern for the Arctic environment. A suspect analytical method was developed with qualification and qualifier ions, isotopic ratios, and retention times of 215 contaminants including persistent organic pollutants (POPs) to establish an in-house library. Non-target analytical method was also optimized with a deconvoluted ion chromatogram, which is a form that can possibly match the mass spectrum of the NIST library. Multiple environmental samples, such as seawater, air, soil, sediment, sludge, and iceberg, collected from the Arctic region were analyzed with suspect and non-target analysis of GC/TOF after the clean-up procedure with a solid phase extraction (SPE) cartridge. The commonly detected contaminants in the Arctic environmental samples were siloxanes, organophosphate flame retardants, phthalates, synthetic musk compounds, polychlorinated biphenyls, and polycyclic aromatic hydrocarbons. Among them, siloxanes and organophosphate flame retardants were proposed to be contaminants of emerging concerns for the Arctic environment. This is the first report to prioritize emerging contaminants in the Arctic environment with suspect and non-target analysis of GC/TOF. 2019-10-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/10550 Title: Understanding the process and impact ofpolar shrub expansionusing the Ecosystem Demography Model Authors: 김연주 2019-09-28T00:00:00Z https://repository.kopri.re.kr/handle/201206/11044 Title: Study on behavioral characteristics of tardigrade using microfluidic chip Authors: 성형진 2019-06-21T00:00:00Z