doi:  10.3878/j.issn.1006-9895.1801.17194
FGOALS耦合模式两个版本的 海洋热吸收与气候敏感度的关系研究

Relationship Between Ocean Heat Uptake and Climate Sensitivity in Two Versions of FGOALS
摘要点击 1728  全文点击 163  投稿时间:2017-07-20  修订日期:2017-12-11
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基金:  国家自然科学基金(批准号:41376019和41376039)、中国科学院战略性先导科技专项 “热带西太平洋海洋系统物质能量交换及其影响(XDA11010304)”、以及江苏高校优势学科(PAPD)建设工程联合资助
中文关键词:  海洋热吸收 气候敏感度 经圈翻转环流
英文关键词:  ocean heat uptake, climate sensitivity, meridional overturning circulation
              
作者中文名作者英文名单位
李伊吟Li Yiyin南京信息工程大学
智海
林鹏飞LinPengfei中国科学院大气物理研究所
刘海龙中国科学院大气物理研究所
于溢于溢国家海洋局第二海洋研究所卫星海洋环境动力学国家重点实验室
引用:李伊吟,智海,林鹏飞,刘海龙,于溢.2018.FGOALS耦合模式两个版本的 海洋热吸收与气候敏感度的关系研究[J].大气科学
Citation:Li Yiyin,LinPengfei,于溢.2018.Relationship Between Ocean Heat Uptake and Climate Sensitivity in Two Versions of FGOALS[J].Chinese Journal of Atmospheric Sciences (in Chinese)
中文摘要:
      海洋在气候变暖过程中的重要性通常用海洋热吸收来衡量,热吸收的大小影响全球变暖的幅度。本文利用FGOALS-g2,FGOALS-s2(以下分别缩写为g2、s2)两个耦合模式的CO2以每年1%速率增长(1pctCO2)试验,评估和分析海洋热吸收与气候敏感度关系。结果表明:耦合模式s2中的瞬态气候响应(TCR,或称气候敏感度)比g2大,这与s2模式中的海洋热吸收主要集中在上层有关,虽然进入海洋净热通量(s2模式大于g2模式)会使得s2模式的海洋热吸收总体比g2模式大。当CO2加倍时,在两个耦合模式中,海洋热吸收的空间分布呈现显著性的差异,s2模式中上层热吸收明显比深层大,上层热吸收主要位于太平洋和印度洋,而g2模式中上层和深层热吸收差别较小,深层主要位于大西洋和北冰洋。进一步研究表明,海洋热吸收分布特征与两个耦合模式海洋环流变化有关。在g2模式中北大西洋经圈翻转环流(AMOC)强度强且深度大,在CO2加倍时,AMOC减弱小,这样AMOC可将热量带到海洋的深层,增加海洋深层热吸收。而在s2模式中,平均AMOC弱且浅,在CO2加倍时,AMOC减弱明显,热量不易到达深层,主要集中在海洋上层,对气候敏感度影响更快且更强。海洋环流导致热吸收及其空间差异同时影响到气候敏感度的差异。因此,探讨海洋热吸收与气候敏感度之间的关系,利于明确气候敏感度不确定性的来源。
Abstract:
      Ocean?heat?uptake (OHU) can?affect?the?magnitude?of?global?warming?rate and is?an?important?way?to?measure?global?warming. By utilizing the experiments of 1%/year increase of CO2 simulated by two coupled models FGOALS-g2 and FGOALS-s2 (hereinafter abbreviated as g2, s2), this study assesses and analyses the relationship between OHU and climate sensitivity. The result shows that: the transient climate response (TCR, named climate sensitivity) in s2 is larger than that in g2, which is mainly related to the larger OHU accumulating in the upper ocean, although the larger net heat flux into the ocean in s2 (than g2) results in the whole OHU in s2 is larger than g2. When CO2 is doubling, there are significant OHU spatial distributions in these two coupled models. The OHU in the upper ocean is significantly larger than that in the deep ocean in s2. In s2, the OHU in the upper ocean is mainly located in the Indian-Pacific Ocean. Different from s2, the OHU difference between the upper ocean and deep ocean is small in g2. The OHU in the deep ocean is mainly located in the Atlantic-Arctic Ocean. Furthermore, the OHU distributions are related with the change of ocean meridional overturning circulation. The Atlantic Meridional Overturning Circulation (AMOC) in g2 is stronger and deeper than that in s2 in the piControl experiment. Meanwhile, the change of AMOC is relatively small when CO2 is doubled in g2. These changes can bring more heat into the deep ocean and result in increases of OHU in the deep ocean. The averaged AMOC in s2 is weak and shallow in the piControl experiment and AMOC weakens significantly when CO2 is doubled. Therefore, the absorbed heat is retained mainly in the upper ocean, which affects the climate sensitivity fast and strongly. The OHU change and its spatial distribution induced by ocean circulation affect the climate sensitivity. Therefore, the study of the relationship between OHU and climate sensitivity can help clarifying the uncertainty sources of climate sensitivity.
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