...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Physical Oceanography >Heat and Mass Budgets of the Warm Upper Layer of the Tropical Atlantic Ocean in 1979-99
【24h】

Heat and Mass Budgets of the Warm Upper Layer of the Tropical Atlantic Ocean in 1979-99

机译：1979-99年热带大西洋温暖上层的热量和物质收支

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 mass and heat budgets of the warm upper-ocean layer are investigated in the equatorial Atlantic using in situ observations during the period 1979-99, which encompassed a series of warm events in the equatorial Atlantic. The warm water layer is defined as the layer having an in situ temperature higher than 20℃, which is within the core of the equatorial thermocline. The geostrophic transport is calculated by combining gridded temperatures with historical salinity data. The Ekman transport is estimated from observed wind data or model-based wind products. The change in warm water volume is then compared with the horizontal mass convergence, and the residuals are determined. The heat budget of the upper layer is investigated in the same way. Three regions are considered: the equatorial band between 8°N and 8°S to study the meridional redistribution of the warm water and two boxes (western and eastern boxes) to investigate the zonal redistribution of the warm water. Mass and heat budget variability in the equatorial band is discussed in relation to the zonal wind variability. The authors discovered that during the development of an equatorial warm event the meridional net divergence first decreases, reaching its minimum as the warm event matures. Meridional divergence increases again as conditions become normal in the equatorial band. The vertical velocity through the 20℃ isotherm also reveals variations consistent with this scenario. Cross-isotherm mass transport decreases during warm events. The heat budget residual is more difficult to interpret. The average value is consistent with heat loss through turbulent mixing at the base (20° isotherm), but the fluctuations are most likely noise, resulting mainly from the limited accuracy of the model surface heat fluxes used.
机译：利用1979-99年期间的原地观测资料，对赤道大西洋的上层洋海层的质量和热量收支进行了调查，其中包括一系列赤道大西洋的暖事件。暖水层的定义是原位温度高于20℃的层，它位于赤道热跃层的核心内。通过结合栅格化温度和历史盐度数据来计算地转运动。埃克曼运输是根据观测的风数据或基于模型的风产品估算的。然后将温水量的变化与水平质量收敛进行比较，并确定残差。以相同的方式研究上层的热量收支。考虑了三个区域：在8°N和8°S之间的赤道带，用于研究暖水的子午再分布；以及两个框（西边和东边的盒子），用于研究温水的纬向再分布。关于纬向风的可变性，讨论了赤道带的质量和热量收支的可变性。作者发现，在赤道暖事件发展过程中，子午线净散度首先减小，随着暖事件的成熟达到其最小值。随着条件在赤道带变得正常，子午线散度再次增加。通过20℃等温线的垂直速度也揭示了与这种情况一致的变化。在温暖的事件中，等温线的传质减少。热收支残差更难以解释。平均值与基部（20°等温线）处湍流混合引起的热损失相符，但波动最有可能是噪声，这主要是由于所使用的模型表面热通量的准确性有限所致。

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