Evaluation of CMIP5 models on sea surface salinity in the Indian Ocean

3rd International Symposium on LAPAN-IPB Satellite For Food Security and Environmental Monitoring 2016

地球科学;轻工业;生态环境科学

Fathrio, Ibnu^1,2 ; Manda, Atsuyoshi^3 ; Iizuka, Satoshi^4 ; Kodama, Yasu-Masa^1 ; Ishida, Sachinobu^1

Meteorological Laboratory, Graduate School of Science and Technology, Hirosaki University, Hirosaki, Aomori, Japan^1

National Institute of Aeronautics and Space of Indonesia, West Java, Bandung, Indonesia^2

Climate and Ecosystems Dynamics Division, Graduate School of Bioresources, Mie University, Tsu, Mie, Japan^3

Storm, Flood and Landslide Division, National Research Institute for Earth Science and Disaster Resilience, Ibaraki, Tsukuba, Japan^4

关键词: Advection process;    Air sea interactions;    Coupled modeling;    Future climate;    Multi-model ensemble;    Ocean stratification;    Sea surface salinity;    Western indian oceans;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/54/1/012039/pdf
DOI  :  10.1088/1755-1315/54/1/012039

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Prior to future climate assessment of the 5th Coupled Model Intercomparison (CMIP5) experiments, how well CMIP5 models simulates present climate should be examined. Sea surface salinity (sss) play important role in ocean stratification and indirectly affects air sea interaction. However, few studies have been carried out to evaluate sss in CMIP5 models. In this study, performance of CMIP5 models in simulating sss in Indian Ocean was examined with respect to the observation. Our results showed that multi model ensemble (MME) mean of CMIP5 models displayed annual and seasonal salinity bias in three regions i.e. Western Indian Ocean (WIO), Bay of Bengal (BOB) and Southeastern Indian Ocean (SEIO). CMIP5 models overestimate sss in BOB about 1.5 psu and underestimated sss in WIO and SEIO about 0.4 psu. Biases in WIO and BOB were mainly attributed to bias in precipitation. CMIP5 models overestimated (underestimated) precipitation in WIO (BOB) with greater bias found during Boreal summer to winter. Meanwhile, advection process was responsible for negative SSS bias in SEIO.