An assessment of climatological ocean temperature and salinity simulated by the CMIP5 climate models

Title
An assessment of climatological ocean temperature and salinity simulated by the CMIP5 climate models
Author(s)
신호정; 장찬주; 김용선
KIOST Author(s)
Jang, Chan Joo(장찬주)Kim, Yong Sun(김용선)
Publication Year
2017-05-17
Abstract
A change in ocean circulation can induce a climatic change on a decadal to centennial (or longer) time scale. As a great reservoir of thermal energy, ocean can slowdown (or accelerate) global warming by absorbing (or releasing) thermal energy from (or to) the atmosphere. Thus, climate models’ capability to simulate the ocean is important for climate modeling and future climate projection. Evaluation of ocean modelling for a climate change, however, has been largely done for the surface values or for specific regions, or it has been often done only for a small number of models. The purpose of this study is to make an assessment of CMIP5 (fifth phase of Coupled Model Intercomparison Project) climate models on the climatological mean ocean temperature and salinity.Using 38 climate models, we constructed a multi-model ensemble (MME) and compared the climatological annual means for the 30 years from 1975 to 2004 with an ocean reanalysis dataset, EN4. The CMIP5 MME mean (MMM) shows a warm bias overall in the Pacific, Atlantic, Southern and Indian Ocean basins, but a cold bias partly in the upper level of the Pacific and Atlantic basins and in the intermediate level of northern Indian Ocean. The MMM shows a warm bias overall in the Atlantic Ocean from the surface to a deep ocean. It is notable that the largest bias in temperature profile corresponds to the depth of a maximum bias in salinity, where a vertical gradient isgy from (or to) the atmosphere. Thus, climate models’ capability to simulate the ocean is important for climate modeling and future climate projection. Evaluation of ocean modelling for a climate change, however, has been largely done for the surface values or for specific regions, or it has been often done only for a small number of models. The purpose of this study is to make an assessment of CMIP5 (fifth phase of Coupled Model Intercomparison Project) climate models on the climatological mean ocean temperature and salinity.Using 38 climate models, we constructed a multi-model ensemble (MME) and compared the climatological annual means for the 30 years from 1975 to 2004 with an ocean reanalysis dataset, EN4. The CMIP5 MME mean (MMM) shows a warm bias overall in the Pacific, Atlantic, Southern and Indian Ocean basins, but a cold bias partly in the upper level of the Pacific and Atlantic basins and in the intermediate level of northern Indian Ocean. The MMM shows a warm bias overall in the Atlantic Ocean from the surface to a deep ocean. It is notable that the largest bias in temperature profile corresponds to the depth of a maximum bias in salinity, where a vertical gradient is
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/23974
Bibliographic Citation
1 st Workshop on the Trend of NorthWest Pacific Climate Change, pp.12, 2017
Publisher
FIO/JORC/KIOST
Type
Conference
Language
English
Publisher
FIO/JORC/KIOST
Related Researcher
Research Interests

upper ocean dynamics,regional climate modeling,ocean climate change,해양상층역학,지역기후모델링,해양기후변화

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