基于1951—2019年NCEP/NCAR再分析资料、Hadley环流中心海温、海冰密集度资料,通过合成分析和诊断温度异常方程,研究不同类型ENSO对初冬北极海冰的影响。结果表明,EP La Niña发展年初冬(11—12月),巴伦支—喀拉海海冰异常减少;CP L...基于1951—2019年NCEP/NCAR再分析资料、Hadley环流中心海温、海冰密集度资料,通过合成分析和诊断温度异常方程,研究不同类型ENSO对初冬北极海冰的影响。结果表明,EP La Niña发展年初冬(11—12月),巴伦支—喀拉海海冰异常减少;CP La Niña发展初冬,巴伦支—喀拉海海冰异常增加。EP和CP型El Ni1o对初冬北极海冰的影响类似:格陵兰海海冰异常减少,而哈德逊—巴芬湾海冰异常增加。不同类型ENSO对初冬北极海冰的影响主要通过产生不同的大气遥相关,引起同期和前期的海表气温异常而实现。展开更多
Western Yunnan is an important area for Mesozoic marine strata,development of which helps to reconstruct paleoenvironments in the eastern Tethys.To bring knowledge of eastern Tethys up to that of western Tethys,this s...Western Yunnan is an important area for Mesozoic marine strata,development of which helps to reconstruct paleoenvironments in the eastern Tethys.To bring knowledge of eastern Tethys up to that of western Tethys,this study focuses on its sedimentary characteristics and paleoenvironmental significance concentrating on the Xiushan section of the Simao Basin with analyses of the petrology,element geochemistry,and C-O-Sr isotopes.Samples are micrite,bioclastic limestone,marl,and mixed calcareous clastic rocks with the 87Sr/86Sr values of limestone ranging from 0.708255 to 0.708933;theδ^(13)C values of the limestone range from−5‰to+1.5‰and theδ^(18)O values range from−13.7‰to−9.1‰.Based on the results,it is concluded that the Middle Jurassic limestones in the Simao Basin were deposited in a tidal flat environment with a strong influence of terrigenous input.At least one transgression event occurred during the depositional period.The paleoclimate as a whole changed from dry hot to humid hot and back to dry hot again.These enriched and improved results provide further data support for a comparison of the paleoenvironments between the eastern and western Tethys.展开更多
文摘基于1951—2019年NCEP/NCAR再分析资料、Hadley环流中心海温、海冰密集度资料,通过合成分析和诊断温度异常方程,研究不同类型ENSO对初冬北极海冰的影响。结果表明,EP La Niña发展年初冬(11—12月),巴伦支—喀拉海海冰异常减少;CP La Niña发展初冬,巴伦支—喀拉海海冰异常增加。EP和CP型El Ni1o对初冬北极海冰的影响类似:格陵兰海海冰异常减少,而哈德逊—巴芬湾海冰异常增加。不同类型ENSO对初冬北极海冰的影响主要通过产生不同的大气遥相关,引起同期和前期的海表气温异常而实现。
基金granted by the China Geological Survey Project(Grant Nos.DD20221913,DD20201115,and DD20230037)the Fundamental Research Funds of the Chinese Academy of Geological Sciences(Grant No.JKYZD202318)。
文摘Western Yunnan is an important area for Mesozoic marine strata,development of which helps to reconstruct paleoenvironments in the eastern Tethys.To bring knowledge of eastern Tethys up to that of western Tethys,this study focuses on its sedimentary characteristics and paleoenvironmental significance concentrating on the Xiushan section of the Simao Basin with analyses of the petrology,element geochemistry,and C-O-Sr isotopes.Samples are micrite,bioclastic limestone,marl,and mixed calcareous clastic rocks with the 87Sr/86Sr values of limestone ranging from 0.708255 to 0.708933;theδ^(13)C values of the limestone range from−5‰to+1.5‰and theδ^(18)O values range from−13.7‰to−9.1‰.Based on the results,it is concluded that the Middle Jurassic limestones in the Simao Basin were deposited in a tidal flat environment with a strong influence of terrigenous input.At least one transgression event occurred during the depositional period.The paleoclimate as a whole changed from dry hot to humid hot and back to dry hot again.These enriched and improved results provide further data support for a comparison of the paleoenvironments between the eastern and western Tethys.
