Associations between the autumn Arctic sea ice concentration(SIC) and Asian winter temperature are discussed using the singular value decomposition analysis.Results show that in recent 33 years reduced autumn Arctic s...Associations between the autumn Arctic sea ice concentration(SIC) and Asian winter temperature are discussed using the singular value decomposition analysis.Results show that in recent 33 years reduced autumn Arctic sea ice is accompanied by Asian winter temperature decrease except in the Tibetan plateau and the Arctic Ocean and the North Pacific Ocean coast.The autumn SIC reduction excites two geopotential height centers in Eurasia and the north Arctic Ocean,which are persistent from autumn to winter.The negative center is in Barents Sea/Kara Sea.The positive center is located in Mongolia.The anomalous winds are associated with geopotential height centers,providing favorable clod air for the Asian winter temperature decreasing in recent 33 years.This relationship indicates a potential long-term outlook for the Asian winter temperature decrease as the decline of the autumn sea ice in the Arctic Ocean is expected to continue as climate warms.展开更多
During the summer of 2012, the fifth CHINARE Arctic Expedition was carried out, and a submersible mooring system was deployed in M5 station located at(69°30.155'N,169°00.654'W) and recovered 50 d lat...During the summer of 2012, the fifth CHINARE Arctic Expedition was carried out, and a submersible mooring system was deployed in M5 station located at(69°30.155'N,169°00.654'W) and recovered 50 d later. A set of temperature, salinity and current profile records was acquired. The characteristics of these observations are analyzed in this paper. Some main results are achieved as below.(1) Temperature generally decreases while salinity generally increases with increasing depth. The average values of all records are 2.98°C and 32.21 psu.(2)Salinity and temperature are well negatively correlated, and the correlation coefficient between them is –0.84.However, they did not always vary synchronously. Their co-variation featured different characters during different significant periods.(3) The average velocity for the whole water column is 141 mm/s with directional angle of347.1°. The statistical distribution curve of velocity record number gets narrower with increasing depth. More than85% of the recorded velocities are northward, and the mean magnitudes of dominated northward velocities are100–150 mm/s.(4) Rotary spectrum analysis shows that motions with low frequency take a majority of energy in all layers. The most significant energy peaks for all layers are around 0.012 cph(about 3.5 d period), while the tidal motion in mooring area is nonsignificant.(5) Velocities in all layers feature similar and synchronous temporal variations, except for the slight decrease in magnitude and leftward twist from top to bottom. The directions of velocity correspond well to those of surface wind. The average northward volume transport per square meter is0.1–0.2 m3/s under southerly wind, but about –0.2 m3/s during northerly wind burst.展开更多
针对SOI(Silicon on Insulator,绝缘体上的硅)高温压力传感器,在真空环境下使用退火的热处理方法,减小了p-Si与Ti/Pt/Au的接触电阻,得到了合适的电阻值和小的比接触电阻率。通过单一因素控制法研究了退火时间和退火温度两个关键因素对...针对SOI(Silicon on Insulator,绝缘体上的硅)高温压力传感器,在真空环境下使用退火的热处理方法,减小了p-Si与Ti/Pt/Au的接触电阻,得到了合适的电阻值和小的比接触电阻率。通过单一因素控制法研究了退火时间和退火温度两个关键因素对样品电阻值和接触表面形貌的影响。采用半导体分析仪、扫描电镜(SEM)和高低温探针台等测试设备以及传输线模型测试方法对样品的欧姆接触性能进行分析,得出了不同温度和时间与欧姆接触的关系。实验结果表明:样品在退火条件为570℃,80 min时电阻的I-V(伏安特性)曲线呈线性,阻值符合设计值,比接触电阻率小,在0～400℃测试环境下电阻值比较稳定。展开更多
基金The Basic Research Operating Funds of First Institute of Oceanography,State Oceanic Administration under contract No.2014T02 and 2014G02the Chinese Polar Environment Comprehensive Investigation and Assessment Programmes,State Oceanic Administration under contract Nos CHINARE2015-03-01 and CHINARE2015-04-03the Public science and Technology Research Funds Projects of Ocean under contract No.201205007
文摘Associations between the autumn Arctic sea ice concentration(SIC) and Asian winter temperature are discussed using the singular value decomposition analysis.Results show that in recent 33 years reduced autumn Arctic sea ice is accompanied by Asian winter temperature decrease except in the Tibetan plateau and the Arctic Ocean and the North Pacific Ocean coast.The autumn SIC reduction excites two geopotential height centers in Eurasia and the north Arctic Ocean,which are persistent from autumn to winter.The negative center is in Barents Sea/Kara Sea.The positive center is located in Mongolia.The anomalous winds are associated with geopotential height centers,providing favorable clod air for the Asian winter temperature decreasing in recent 33 years.This relationship indicates a potential long-term outlook for the Asian winter temperature decrease as the decline of the autumn sea ice in the Arctic Ocean is expected to continue as climate warms.
基金Chinese Polar Environment Comprehensive Investigation and Assessment Programmes,State Oceanic Administration under contract Nos CHINARE2014-03-01 and CHINARE2014-04-03the Public Science and Technology Research Funds Projects of Ocean under contract No.201205007-1the Basic Research Fund under contract No.GY02-2007T08
文摘During the summer of 2012, the fifth CHINARE Arctic Expedition was carried out, and a submersible mooring system was deployed in M5 station located at(69°30.155'N,169°00.654'W) and recovered 50 d later. A set of temperature, salinity and current profile records was acquired. The characteristics of these observations are analyzed in this paper. Some main results are achieved as below.(1) Temperature generally decreases while salinity generally increases with increasing depth. The average values of all records are 2.98°C and 32.21 psu.(2)Salinity and temperature are well negatively correlated, and the correlation coefficient between them is –0.84.However, they did not always vary synchronously. Their co-variation featured different characters during different significant periods.(3) The average velocity for the whole water column is 141 mm/s with directional angle of347.1°. The statistical distribution curve of velocity record number gets narrower with increasing depth. More than85% of the recorded velocities are northward, and the mean magnitudes of dominated northward velocities are100–150 mm/s.(4) Rotary spectrum analysis shows that motions with low frequency take a majority of energy in all layers. The most significant energy peaks for all layers are around 0.012 cph(about 3.5 d period), while the tidal motion in mooring area is nonsignificant.(5) Velocities in all layers feature similar and synchronous temporal variations, except for the slight decrease in magnitude and leftward twist from top to bottom. The directions of velocity correspond well to those of surface wind. The average northward volume transport per square meter is0.1–0.2 m3/s under southerly wind, but about –0.2 m3/s during northerly wind burst.
文摘针对SOI(Silicon on Insulator,绝缘体上的硅)高温压力传感器,在真空环境下使用退火的热处理方法,减小了p-Si与Ti/Pt/Au的接触电阻,得到了合适的电阻值和小的比接触电阻率。通过单一因素控制法研究了退火时间和退火温度两个关键因素对样品电阻值和接触表面形貌的影响。采用半导体分析仪、扫描电镜(SEM)和高低温探针台等测试设备以及传输线模型测试方法对样品的欧姆接触性能进行分析,得出了不同温度和时间与欧姆接触的关系。实验结果表明:样品在退火条件为570℃,80 min时电阻的I-V(伏安特性)曲线呈线性,阻值符合设计值,比接触电阻率小,在0～400℃测试环境下电阻值比较稳定。
