北京大学大气与海洋科学前沿报告(10.28;10.30;10.31)-IOTA

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北京大学大气与海洋科学前沿报告(10.28;10.30;10.31)

阅读量：3779184 2019-10-25

Relationships between Inner-Core Lightning and Tropical Cyclone Intensity Change
时间：
2019年10月28日，10:00—11:00
地点：
物理大楼北楼539室
(Physics Building, Room N539)
主持人：张庆红

报告人：徐伟新教授
单位：中山大学大气科学学院
研究方向：tropical convection
Forecasting tropical cyclone (TC) intensity remains a challenging task, due primarily to a lack of understanding of the physical processes and mechanisms that govern TC intensity change, especially the role of convective-scale processes. Previous studies suggested that inner-core lightning activity could be an indicator of TC intensity change but their relationships vary greatly and at times appear contradictory. The importance of total lightning (cloud-to-ground and intra-cloud) for TC intensification study and forecasting applications has also been pinpointed by many studies. This talk reviews the studies on inner-core lightning and TC intensity change, then presents our latest results on this topic based on long-term total lightning records from the Lightning Imaging Sensor (TRMM satellite) measurements. Insights on the “surprisingly” negative relationship between inner-core lightning and TC intensity change are provided.

石笋同位素与气候变化的轨道理论
时间：
2019年10月30日，15:00—16:00
地点：
物理大楼北楼547室
(Physics Building, Room N547)
主持人：刘永岗

报告人：程海教授
单位：西安交通大学
研究方向：地质定年、轨道尺度气候变化
Oxygen isotope measurements of marine foraminiferal fossils during 1950’s-1970’s provided continuous records of glacial-interglacial cycles. These records laid the cornerstone of the Milankovitch’s astronomical theory of climate and forever changed our view of our planetary climate system. However, because the focus was essentially on the ice age cycle, low-latitude monsoonal climates was excluded. In the last two decades or so, another revolution in paleoclimatology is unfolding. Significant advances in understanding the climatic controls on oxygen isotope in atmosphere and cave environment together with landmark developments in high-precision radiometric dating techniques have propelled the cave research to the forefront of paleoclimatology. Of particular interest are new cave records from low-middle latitudes, that show another aspect of orbital climate variations, thus calling for a more comprehensive orbital theory. This presentation will also touch on the ‘100 ka problem’—one of the most vexing issues in the orbital theory that was formulated from oxygen isotope records of deep-sea cores nearly a half-century ago.

Exploring approaches to natural hazard readiness
时间：
2019年10月31日，10:00—11:30
地点：
物理大楼北楼539室
(Physics Building, Room N539)
主持人：张庆红

报告人：David Johnston
单位：Joint Centre for Disaster Research, Massey University, New Zealand
研究方向：Disasters and communications
Countries around the world are facing an ever-increasing risk from hazards posed by natural processes such as earthquakes, wildfire, floods and cyclones. This has prompted a substantial body of research into several aspects of disaster risk reduction (DRR). This talk will outline various approaches being undertaken in New Zealand and other countries to prepare for future disasters and examine the effectiveness of such measures.