全新世中期中国地表气温季节性增强

IF 2.3 4区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES
Zhiping Tian, Dabang Jiang
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引用次数: 0

摘要

利用PMIP4(古气候模拟比对项目-第4阶段)气候模式的所有模拟结果,定量分析了6000年前全新世中期中国地面气温的季节性变化及其物理机制。与工业化前相比,所有16个模式均一致显示间冰期中国各地的温度季节性(即夏季减去冬季温度)增强,多模式平均值全国平均增强2.44°C或9%。温度季节变化与地表能量通量的季节对比变化密切相关,这主要是由于中全新世轨道强迫造成的。在全新世中期,大尺度上地表净短波辐射的冬夏增加主导了温度季节性的增强;地表净长波辐射在青藏高原大部分地区和中国东部地区有较小的正贡献;在全国大部分地区,地表潜热通量和感热通量均表现出部分抵消效应。基于能反映季节信号的代用资料重建的中国中全新世气温季节性存在不确定性。摘要利用PMIP4多模式试验数据,作者量化了中全新世(距今约6000年)中国温度季节性变化。结果表明: 相对于工业革命前期, 所有16个模式一致模拟显示中全新世我国温度季节性 (即夏季与冬季温差) 增强, 平均增幅9%; 这与该时期轨道强迫引起的地表能量通量的季节对比变化密切相关, 其中净短波辐射起主导作用, 净长波辐射作用次之, 感热和潜热为负贡献; 与模拟不同, 重建结果存在不确定性.
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Enhanced seasonality of surface air temperature over China during the mid-Holocene

Enhanced seasonality of surface air temperature over China during the mid-Holocene

Using all available simulations performed by climate models participating in PMIP4 (Paleoclimate Modelling Intercomparison Project – Phase 4), the authors quantify the seasonality change of surface air temperature over China during the mid-Holocene (6000 years ago) and the associated physical mechanisms. Relative to the preindustrial period, all 16 models consistently show an enhanced temperature seasonality (i.e., summer minus winter temperature) across China during that interglacial period, with a nationally averaged enhancement of 2.44 °C or 9% for the multimodel mean. The temperature seasonality change is closely related with the seasonal contrast variation of surface energy fluxes mainly due to the mid-Holocene orbital forcing. Specifically, the summer–winter increase in surface net shortwave radiation dominates the intensified temperature seasonality at the large scale of China during the mid-Holocene; the surface net longwave radiation has a minor positive contribution in most of the Tibetan Plateau and eastern China; and both the surface latent and sensible heat fluxes show partial offset effects in most of the country. There are uncertainties in the reconstructed temperature seasonality over China during the mid-Holocene based on the proxy data that can reflect seasonal signals.

摘要

利用PMIP4多模式试验数据, 作者量化了中全新世 (距今约6000年) 中国温度季节性变化. 结果表明: 相对于工业革命前期, 所有16个模式一致模拟显示中全新世我国温度季节性 (即夏季与冬季温差) 增强, 平均增幅9%; 这与该时期轨道强迫引起的地表能量通量的季节对比变化密切相关, 其中净短波辐射起主导作用, 净长波辐射作用次之, 感热和潜热为负贡献; 与模拟不同, 重建结果存在不确定性.

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来源期刊
Atmospheric and Oceanic Science Letters
Atmospheric and Oceanic Science Letters METEOROLOGY & ATMOSPHERIC SCIENCES-
CiteScore
4.20
自引率
8.70%
发文量
925
审稿时长
12 weeks
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