...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Climate >The adequacy of observing systems in monitoring the Atlantic meridional overturning circulation and North Atlantic climate.
【24h】

The adequacy of observing systems in monitoring the Atlantic meridional overturning circulation and North Atlantic climate.

机译：观测系统是否足以监测大西洋经向翻转环流和北大西洋气候。

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The Atlantic meridional overturning circulation (AMOC) has an important influence on climate, and yet adequate observations of this circulation are lacking. Here, the authors assess the adequacy of past and current widely deployed routine observing systems for monitoring the AMOC and associated North Atlantic climate. To do so, this study draws on two independent simulations of the twentieth century using an Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report (AR4) coupled climate model. One simulation is treated as "truth" and is sampled according to the observing system being evaluated. The authors then assimilate these synthetic "observations" into the second simulation within a fully coupled system that instantaneously exchanges information among all coupled components and produces a nearly balanced and coherent estimate for global climate states including the North Atlantic climate system. The degree to which the assimilation recovers the truth is an assessment of the adequacy of the observing system being evaluated. As the coupled system responds to the constraint of the atmosphere or ocean, the assessment of the recovery for climate quantities such as Labrador Sea Water (LSW) and the North Atlantic Oscillation increases the understanding of the factors that determine AMOC variability. For example, the low-frequency sea surface forcings provided by the atmospheric and sea surface temperature observations are found to excite a LSW variation that governs the long-time-scale variability of the AMOC. When the most complete modern observing system, consisting of atmospheric winds and temperature, is used along with Argo ocean temperature and salinity down to 2000 m, a skill estimate of AMOC reconstruction is 90% (out of 100% maximum). Similarly encouraging results hold for other quantities, such as the LSW. The past XBT observing system, in which deep-ocean temperature and salinity were not available, has a lesser ability to recover the truth AMOC (the skill is reduced to 52%). While these results raise concerns about the ability to properly characterize past variations of the AMOC, they also hold promise for future monitoring of the AMOC and for initializing prediction models.Digital Object Identifier http://dx.doi.org/10.1175/2010JCLI3677.1
机译：大西洋子午翻转环流（AMOC）对气候有重要影响，但缺乏对这种环流的充分观测。在这里，作者评估了过去和当前广泛部署的例行观测系统是否足以监测AMOC和相关的北大西洋气候。为此，本研究利用政府间气候变化专门委员会（IPCC）第四次评估报告（AR4）耦合气候模型，对20世纪进行了两次独立模拟。一种模拟被视为“真相”，并根据要评估的观测系统进行采样。然后，作者将这些合成的“观测值”吸收到一个完全耦合的系统中的第二个模拟中，该系统立即在所有耦合的组件之间交换信息，并对包括北大西洋气候系统在内的全球气候状态产生几乎平衡且一致的估计。同化恢复真相的程度是对所评估的观测系统是否适当的评估。当耦合系统响应大气或海洋的限制时，对诸如拉布拉多海水（LSW）和北大西洋涛动等气候量恢复的评估增加了对决定AMOC变异性的因素的了解。例如，发现大气和海面温度观测值提供的低频海面强迫激发了一个LSW变化，该变化控制了AMOC的长期尺度变化。当使用最完整的现代观测系统（包括大风和温度）以及Argo海洋温度和盐度低至2000 m时，AMOC重建的技术估算为90％（最大值为100％）。同样，其他数量（例如LSW）的销量也令人鼓舞。过去的XBT观测系统无法获得深海温度和盐度，因此恢复真AMOC的能力较低（该技能降低为52％）。尽管这些结果引起人们对正确表征AMOC过去变化的能力的担忧，但它们也为将来对AMOC的监视和初始化预测模型提供了希望。数字对象标识符http://dx.doi.org/10.1175/2010JCLI3677。 1个

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号