...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Sources of global warming in upper ocean temperature during El Nino
【24h】

Sources of global warming in upper ocean temperature during El Nino

机译：厄尔尼诺现象期间全球海洋高温的全球变暖源

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

Global average sea surface temperature (SST) from 40 degreesS to 60 degreesN fluctuates +/-0.3 degreesC on interannual period scales, with global warming (cooling) during El Nino (La Nina). About 90% of the global warming during El Nino occurs in the tropical global ocean from 20 degreesS to 20 degreesN, half because of large SST anomalies in the tropical Pacific associated with El Nino and the other half because of warm SST anomalies occurring over similar to 80% of the tropical global ocean. From examination of National Centers for Environmental Prediction [Kalnay et al., 1996] and Comprehensive Ocean-Atmosphere Data Set [Woodruff et al., 1993] reanalyses, tropical global warming during El Nino is associated with higher troposphere moisture content and cloud cover, with reduced trade wind intensity occurring during the onset phase of EI Nino. During this onset phase the tropical global average diabatic heat storage tendency in the layer above the main pycnocline is 1-3 Wm(-2) above normal. Its principal source is a reduction in the poleward Ekman heat flux out of the tropical ocean of 2-5 Wm(-2). Subsequently, peak tropical global warming during El Nino is dissipated by an increase in the flux of latent heat to the troposphere of 2-5 W m(-2), with reduced shortwave and longwave radiative fluxes in response to increased cloud cover tending to cancel each other. In the extratropical global ocean the reduction in poleward Ekman heat flux out of the tropics during the onset of El Nino tends to be balanced by reduction in the flux of latent heat to the troposphere. Thus global warming and cooling during Earth's internal mode of interannual climate variability arise from fluctuations in the global hydrological balance, not the global radiation balance. Since it occurs in the absence of extraterrestrial and anthropogenic forcing, global warming on decadal, interdecadal, and centennial period scales may also occur in association with Earth's internal modes of climate variability on those scales. [References: 35]
机译：全球平均海表温度（SST）从40度到60度N在年际尺度上波动+/- 0.3度，随着厄尔尼诺（拉尼娜）的全球变暖（降温）。厄尔尼诺现象期间约90％的全球变暖发生在20度到20度南半球的热带全球海洋中，一半是由于与厄尔尼诺现象有关的热带太平洋SST异常大，另一半是由于类似全球热带海洋的80％。根据对国家环境预测中心[Kalnay等人，1996]和海洋综合大气数据集[Woodruff等人，1993]的重新分析，厄尔尼诺现象期间的热带全球变暖与对流层的水分含量和云量较高有关，在EI Nino爆发阶段降低了贸易风强度。在这个开始阶段，主要比索环线以上层的热带全球平均绝热储热趋势比正常高1-3 Wm（-2）。其主要来源是从极地的埃克曼热通量减少到热带海洋2-5 Wm（-2）。随后，厄尔尼诺现象期间热带最高峰的全球变暖通过向对流层的潜热通量增加了2-5 W m（-2）而消失，短波和长波辐射通量减小，这是由于云量增加趋向于抵消的缘故彼此。在全球温带海洋中，厄尔尼诺现象爆发期间，极地埃克曼热通量从热带地区流出的趋势往往会通过减少对流层潜热通量来平衡。因此，地球内部年际气候变化的内部模式期间的全球变暖和变冷是由全球水文平衡而不是全球辐射平衡的波动引起的。由于它是在没有地外和人为强迫的情况下发生的，因此，年代际，年代际和百年尺度上的全球变暖也可能与这些尺度上地球内部气候变率的模式有关。 [参考：35]

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