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学术报告(2017年2月15日)

时间:  2017-02-13 08:34  点击:  
  应中科院西北生态资源环境研究院冰冻圈科学国家重点实验室邀请,美国朴茨茅斯大学地理系Nick Pepin博士来实验室进行学术交流,并将做如下学术报告,欢迎感兴趣的科研人员和研究生参加。
 
报  告 人: Nick Pepin 博士
 
报告题目:Evidence for elevation-dependent warming around the world: Are mountains a hotspot for warming?
 
报告时间:2017年2月15日(星期三)15:00开始
 
报告地点:科研3号楼七楼会议室
 
主  持  人:任贾文 研究员
 
  报告内容简介:
  Accelerated warming at high elevations: a review of the current evidence and proposals for future research Arctic amplification, whereby enhanced warming is evident at high latitudes, is well accepted amongst the scientific community. Increased warming at high elevations is more controversial and is often given the more vague term “elevational dependency”. There are strong feedback mechanisms in the mountain environment (e.g. cryospheric change, water vapor and treelines) which will enhance warming at certain elevations. However the details of this are poorly understood. Snow albedo feedback and advance of treelines upslope will tend to amplify warming in particular elevation bands but potential effects and interactions vary according to latitude and seasonality. Other free atmospheric changes such as moistening of the atmosphere which releases latent heat, the non-linear dependence of downwelling longwave radiation on specific humidity, and the non-linear relationship between thermal emission and air temperature, will tend to enhance warming at higher elevations.
 
  Despite strong theoretical reasons as to why higher elevations should warm more rapidly, our observational evidence of temperature change at high elevations is poor. There is a lack of stations worldwide above 4000 m, and in China stations are biased towards low elevations. There is also a bias towards valley locations. Mountain summits and exposed ridge sites are shown to show least variability in warming rates on a global scale, rising up above a sea of noise and need to be expanded. Satellite data potentially overcomes the lack of high elevation stations (e.g. MODIS LST) but can be rather divorced from the mountain environment and needs careful calibration/comparison with surface datasets. Reanalyses such as NCEP/NCAR and ERA, although having good spatial coverage, tend to suffer from similar problems. Following a discussion of differences between all these approaches, a plan to develop an integrated approach to quantifying elevation-dependent warming will be discussed.
 
  报告人简介:
  Dr Nick Pepin is Reader in Climate Science at the University of Portsmouth in the U.K. He is best known for his published work on high elevation climate change. He is a world expert on elevation-dependent warming and has extensive field experience in researching mountain climate in mountains and areas of complex topography across the world, including Arctic Lapland, the mid-latitudes (e.g. Pyrenees and Colorado) and the tropics (Kilimanjaro).

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