中国东部亚热带地区全新世期间的气候波动频繁,引起哺乳动物群的多次迁徙。该时期哺乳动物群的常见种属多见于亚热带地区,仅少数种属如貘、犀、长臂猿和亚洲象等在自然状态下主要分布于热带―中亚热带南部地区,指示了具热带气候性质的...中国东部亚热带地区全新世期间的气候波动频繁,引起哺乳动物群的多次迁徙。该时期哺乳动物群的常见种属多见于亚热带地区,仅少数种属如貘、犀、长臂猿和亚洲象等在自然状态下主要分布于热带―中亚热带南部地区,指示了具热带气候性质的中亚热带南部的森林环境。文章在确定中国东部全新世不同阶段此类动物群的种属构成与分布特征的基础上,主要根据热带种的迁徙和分布特征,初步推断各阶段亚热带地区的气候变迁状况如下：盛冰期之后的冰消期,温度逐渐回升,14 000―12 000 a BP时,热带种分布北界大致南移2°,指示1月平均气温较今低3~5℃;12 000―8 500 a BP为升温期,气候转暖,热带种分布北界达中亚热带南部,逐渐类似于现今气候;8 500―5 000 a BP为大暖期,热带种分布北界抵秦岭―淮河一线,北移约6°,指示1月气温较今高约7~9℃;5 000―3 000 a BP为降温期,热带种分布北界位于秦岭―淮河以南的长江流域,北移约4°,指示1月气温较今高约5~6℃;3 000 a BP以来,气候逐渐变冷。这些变化体现了中国东部亚热带地区在全新世时期发生了多次较大的气候和生物气候带变迁事件。展开更多
The responses of the East Asian summer monsoon(EASM)to large volcanic eruptions were analyzed using a millennial simulation with the FGOALS-gl climate system model.The model was driven by both natural(solar irradiance...The responses of the East Asian summer monsoon(EASM)to large volcanic eruptions were analyzed using a millennial simulation with the FGOALS-gl climate system model.The model was driven by both natural(solar irradiance,volcanic eruptions)and anthropogenic(greenhouse gases,sulfate aerosols)forcing agents.The results showed cooling anomalies after large volcanic eruptions almost on a global scale.The cooling over the continental region is stronger than that over the ocean.The precipitation generally decreases in the tropical and subtropical regions in the first summer after large volcanic eruptions.Cooling with amplitudes up to-0.3°C is seen over eastern China in the first summer after large volcanic eruptions.The East Asian continent is dominated by northeasterly wind anomalies and the corresponding summer rainfall exhibits a coherent reduction over the whole of eastern China.An analysis of the surface heat flux suggested the reduction in summer precipitation over eastern China can be attributed to a decrease of moisture vapor over the tropical oceans,and the weakening of the EASM may be attributed to the reduced land–sea thermal contrast after large volcanic eruptions.展开更多
文摘中国东部亚热带地区全新世期间的气候波动频繁,引起哺乳动物群的多次迁徙。该时期哺乳动物群的常见种属多见于亚热带地区,仅少数种属如貘、犀、长臂猿和亚洲象等在自然状态下主要分布于热带―中亚热带南部地区,指示了具热带气候性质的中亚热带南部的森林环境。文章在确定中国东部全新世不同阶段此类动物群的种属构成与分布特征的基础上,主要根据热带种的迁徙和分布特征,初步推断各阶段亚热带地区的气候变迁状况如下：盛冰期之后的冰消期,温度逐渐回升,14 000―12 000 a BP时,热带种分布北界大致南移2°,指示1月平均气温较今低3~5℃;12 000―8 500 a BP为升温期,气候转暖,热带种分布北界达中亚热带南部,逐渐类似于现今气候;8 500―5 000 a BP为大暖期,热带种分布北界抵秦岭―淮河一线,北移约6°,指示1月气温较今高约7~9℃;5 000―3 000 a BP为降温期,热带种分布北界位于秦岭―淮河以南的长江流域,北移约4°,指示1月气温较今高约5~6℃;3 000 a BP以来,气候逐渐变冷。这些变化体现了中国东部亚热带地区在全新世时期发生了多次较大的气候和生物气候带变迁事件。
基金supported by the National Natural Science Foundation of China(41305069)the Open Project Program of the Key Laboratory of Meteorological Disaster of Ministry of Education,Nanjing University of Information Science and Technology,China R&D Special Fund for Public Welfare Industry(meteorology)(GYHY201406020)the National Basic Research Program of China(2010CB951904)
文摘The responses of the East Asian summer monsoon(EASM)to large volcanic eruptions were analyzed using a millennial simulation with the FGOALS-gl climate system model.The model was driven by both natural(solar irradiance,volcanic eruptions)and anthropogenic(greenhouse gases,sulfate aerosols)forcing agents.The results showed cooling anomalies after large volcanic eruptions almost on a global scale.The cooling over the continental region is stronger than that over the ocean.The precipitation generally decreases in the tropical and subtropical regions in the first summer after large volcanic eruptions.Cooling with amplitudes up to-0.3°C is seen over eastern China in the first summer after large volcanic eruptions.The East Asian continent is dominated by northeasterly wind anomalies and the corresponding summer rainfall exhibits a coherent reduction over the whole of eastern China.An analysis of the surface heat flux suggested the reduction in summer precipitation over eastern China can be attributed to a decrease of moisture vapor over the tropical oceans,and the weakening of the EASM may be attributed to the reduced land–sea thermal contrast after large volcanic eruptions.
