2017 , Vol. 32 >Issue 4: 373 - 381
DOI: https://doi.org/10.11867/j. issn. 1001-8166.2017.04.0373
The Simulation of Stratocumulus and Its Impacts on SST:Based on the IAP Near-Term Climate Prediction System
First author:Zhun Guo(1983-),male,Yiyang City,Henan Province,Associate Professor. Research areas include cloud physics, cloud-climate interaction.E-mail:guozhun@lasg.iap.ac.cn
Received date: 2016-11-07
Revised date: 2017-02-28
Online published: 2017-04-20
Supported by
Foundation item:Project supported by the R&D Special Fund for Public Welfare Industry (Meteorology) “Development and research of ensemble decadal climate prediction system based on global climate models FGOALS-s, CAMS and CESM”;The National Natural Science Foundation of China“The role of cloud feedback in Air-Sea interaction over east asian-northwestern pacific ocean region and its simulating uncertainties”(No.41405103)
Copyright
The near-term climate prediction system (DecPreS) is built on the initialization of the ocean state, which can be regarded as a full-coupled system with “adjusted” air-sea interactions. The relationship between stratocumulus and Sea Surface Temperature (SST ) is an essential part of air-sea interactions. In this study, we investigated such a relationship in DecPreS of the Institute of Atmospheric Physics, in which the merge of the Ensemble Optimal Interpolation (EnOI) and Incremental Analysis Update (IAU) scheme was employed. EnOI-IAU generally reproduces the spatial pattern of SST and low-clouds. However, the simulated cloud fraction/liquid water path are underestimated while the SST is overestimated in stratocumulus regimes, especially in the subtropical East Pacific and South Ocean. It is partly because the unrealistic air-sea interaction dominates these regions that the underestimated stratocumulus allows more input of incoming shortwave flux (20 W/m2). The deficient stratocumulus is highly related to the unrealistic vertical structure of Atmospheric Boundary Layer (ABL), in which the moisture, temperature and vertical heat transports concentrate at the surface layer. Our results imply that stratocumulus and ABL be important in DecPreS. Clarifying the importance of ABL and stratocumulus will provide a possible way to improve the DecPreS.
Key words： near-term prediction; Coupled GCM; SST; Stratocumulus; Atmospheric boundary layer.
Zhun Guo , Tianjun Zhou . The Simulation of Stratocumulus and Its Impacts on SST:Based on the IAP Near-Term Climate Prediction System[J]. Advances in Earth Science, 2017 , 32(4) : 373 -381 . DOI: 10.11867/j. issn. 1001-8166.2017.04.0373
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