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特邀英國雷丁大學David Ferreira副教授、Robert Thompson博士來校做係列學術講座
作者:大氣科學學院               發布時間:2019/11/27 11:31:51              瀏覽量:282

季風降水的變率及其物理機製研究對於高密度人口分布地區具有重大意義。季風降水從過去、現在、到未來的變化如何,外強迫(如:人類活動)對季風降水的作用如何,並不十分清楚。雙偏振天氣雷達的強降水數據多局限於定性分析應用,了解雷達資料定量分析的最新進展也很有必要。為了讓大家了解降水變率及其機製、雷達天氣觀測等方麵的最新研究進展,特邀英國雷丁大學DavidFerreira副教授、Robert John Thompson博士來校訪問交流,歡迎廣大師生踴躍參加!

報告時間:2019年12月2日(周一)上午9:30-11:30

報告地點:氣象樓423報告廳

主  持  人:張文君教授

 

報告一題目:Northern Hemisphere Monsoon Response to Mid-Holocene Orbital Forcing and Greenhouse Gas-Induced Global Warming

報  告  人:David Ferreira副教授

摘要:Changes in monsoons with anthropogenic forcing has raised a lot of interest in recent years. To make progress in understanding the dynamics of monsoons and their response to external forcings, we exploit simulations the Paleo and Coupled Model Intercomparison. Project phase 5 simulations for mid-Holocene (~6000 years ago) and future climate scenario rcp8.5.Although the Northern Hemisphere warming and inter-hemispheric thermal contrast in boreal summer are larger in the future than at the mid-Holocene, changes in the spatial extent and rainfall intensity in future climate are smaller than in mid-Holocene for all Northern Hemisphere monsoons except the Indian monsoon. A decomposition of the moisture budget in thermodynamic and dynamic contributions reveals that the dynamic component, primarily constrained by changes in net energy input (the difference between the top of the atmosphere and surface heat fluxes), is the critical element that controls the magnitude of the monsoon response.Our results highlight that temperature indices are poor indicators of the monsoonal response. Rather, the monsoon response is particularly sensitive to the integrated energy balance, which accounts for changes at the surface as well as at the top of the atmosphere.

 

報告二題目:Use of Dual Polarisation Weather Radar for Intense, Flood Producing Rainfall

報  告  人:Robert John Thompson博士

摘要:Over the last 15 years, dual-polarisation weather radar has moved from the realms of specialist research facilities to reality of operational networks over much of the world. For many years weather radars have been used qualitatively, but rarely quantitatively due to a number of issues – often leading to under-use in hydrology. I’ll talk about some of the improvements that have been achieved from the new networks leading to viable quantitative use and discuss the potential for greater insight that the new data provides.

 

專家簡介:

David Ferreira,英國雷丁大學氣象學係副教授。主要研究領域包括大氣海洋動力學、大氣環流、海洋渦旋、海-氣-冰相互作用。

Robert John Thompson,英國雷丁大學氣象學係講師。主要研究領域為雙偏振雷達及其在致洪強降水監測中的應用。

 

氣象災害教育部重點實驗室

氣象災害預報預警與評估省部共建協同創新中心

大氣科學學院

2019.11.27