GSTDTAP

浏览/检索结果: 共6条,第1-6条 帮助

已选(0)清除 条数/页:   排序方式:
Short-term tests validate long-term estimates of climate change 期刊论文
NATURE, 2020, 582 (7811) : 185-186
作者:  Tollefson, Jeff
收藏  |  浏览/下载:19/0  |  提交时间:2020/07/03

Climate sensitivity to atmospheric CO2 levels is likely to be high.


Six-hour weather forecasts have been used to validate estimates of climate change hundreds of years from now. Such tests have great potential - but only if our weather-forecasting and climate-prediction systems are unified.


  
Coherent laser spectroscopy of highly charged ions using quantum logic 期刊论文
NATURE, 2020, 578 (7793) : 60-+
作者:  Oh, Myoung Hwan;  Cho, Min Gee;  Chung, Dong Young;  Park, Inchul;  Kwon, Youngwook Paul;  Ophus, Colin;  Kim, Dokyoon;  Kim, Min Gyu;  Jeong, Beomgyun;  Gu, X. Wendy;  Jo, Jinwoung;  Yoo, Ji Mun;  Hong, Jaeyoung;  McMains, Sara;  Kang, Kisuk;  Sung, Yung-Eun;  Alivisatos, A. Paul;  Hyeon, Taeghwan
收藏  |  浏览/下载:75/0  |  提交时间:2020/07/03

Precision spectroscopy of atomic systems(1) is an invaluable tool for the study of fundamental interactions and symmetries(2). Recently, highly charged ions have been proposed to enable sensitive tests of physics beyond the standard model(2-5) and the realization of high-accuracy atomic clocks(3,5), owing to their high sensitivity to fundamental physics and insensitivity to external perturbations, which result from the high binding energies of their outer electrons. However, the implementation of these ideas has been hindered by the low spectroscopic accuracies (of the order of parts per million) achieved so far(6-8). Here we cool trapped, highly charged argon ions to the lowest temperature reported so far, and study them using coherent laser spectroscopy, achieving an increase in precision of eight orders of magnitude. We use quantum logic spectroscopy(9,10) to probe the forbidden optical transition in Ar-40(13+) at a wavelength of 441 nanometres and measure its excited-state lifetime and g-factor. Our work unlocks the potential of highly charged ions as ubiquitous atomic systems for use in quantum information processing, as frequency standards and in highly sensitive tests of fundamental physics, such as searches for dark-matter candidates(11) or violations of fundamental symmetries(2).


The precision of laser spectroscopy of highly charged ions is improved by eight orders of magnitude by cooling trapped, highly charged ions and using quantum logic spectroscopy, thereby enabling tests of fundamental physics.


  
Constraining the Variability of the Atlantic Meridional Overturning Circulation During the Holocene 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2019
作者:  Lippold, Joerg;  Poeppelmeier, Frerk;  Suefke, Finn;  Gutjahr, Marcus;  Goepfert, Tyler J.;  Blaser, Patrick;  Friedrich, Oliver;  Link, Jasmin M.;  Wacker, Lukas;  Rheinberger, Stefan;  Jaccard, Samuel L.
收藏  |  浏览/下载:31/0  |  提交时间:2019/11/27
AMOC  Holocene  high resolution 231Pa  230Th  Bermuda Rise  sensitivity tests  
Impact of air-sea drag coefficient for latent heat flux on large scale climate in coupled and atmosphere stand-alone simulations 期刊论文
CLIMATE DYNAMICS, 2019, 52: 2125-2144
作者:  Torres, Olivier;  Braconnot, Pascale;  Marti, Olivier;  Gential, Luc
收藏  |  浏览/下载:11/0  |  提交时间:2019/04/09
Latent heat flux  Bulk parameterization  Sensitivity tests  Atmospheric heat transport  Ocean-atmosphere coupling  Climate simulations  
The Remote Responses of Early Summer Cold Vortex Precipitation in Northeastern China to the precedent Sea Surface Temperatures 期刊论文
ATMOSPHERIC RESEARCH, 2018, 214: 399-409
作者:  Fang, Yi-He;  Chen, Kai-Qi;  Chen, Hai-Shan;  Xu, Shi-Qi;  Geng, Xin;  Li, Tian-Yu;  Teng, Fang-Da;  Zhou, Xiao-Yu;  Wang, Yong-Guang
收藏  |  浏览/下载:47/0  |  提交时间:2019/04/09
NEC  Early summer northeast cold vortex precipitation  Ural Mountains'  blocking high  Sea of Okhotsk'  s blocking high  Lake Baikal'  s blocking high  North Atlantic SST tripole  Kuroshio SST  Model sensitivity tests  
Omens of coupled model biases in the CMIP5 AMIP simulations 期刊论文
CLIMATE DYNAMICS, 2018, 51: 2927-2941
作者:  Gainusa-Bogdan, Alina;  Hourdin, Frederic;  Traore, Abdoul Khadre;  Braconnot, Pascale
收藏  |  浏览/下载:15/0  |  提交时间:2019/04/09
Climate model biases  AMIP simulations  Coupled simulations  Latent heat flux  Sea surface temperature  Sensitivity tests