Sensitivity of Atlantic Meridional Overturning Circulation to the Dynamical Framework in a
Sensitivity of Atlantic Meridional Overturning Circulation to the Dynamical Framework in an
Ocean General Circulation Model
Xiaolan LI;Yongqiang YU;Hailong LIU;Pengfei LIN
【期刊名称】《气象学报（英文版）》 【年(卷),期】2017(031)003
【摘要】The horizontal coordinate systems commonly used in most global ocean models are the spherical latitude–longit-ude grid and displaced poles, such as a tripolar grid. The effect of the horizontal coordinate system on Atlantic meri-dional overturning circulation (AMOC) is evaluated by using an OGCM (ocean general circulation model). Two ex-periments are conducted with the model—one using a latitude–longitude grid (referred to as Lat_1) and the other us-ing a tripolar grid (referred to as Tri). The results show that Tri simulates a stronger North Atlantic deep water (NADW) than Lat_1, as more saline water masses enter the Greenland–Iceland–Norwegian (GIN) seas in Tri. The stronger NADW can be attributed to two factors. One is the removal of the zonal filter in Tri, which leads to an in-creasing of the zonal gradient of temperature and salinity, thus strengthening the north geostrophic flow. In turn, it decreases the positive subsurface temperature and salinity biases in the subtropical regions. The other may be associ-ated with topography at the North Pole, because realistic
topography is applied in the tripolar grid while the latitude–longitude grid employs an artificial island around the North Pole. In order to evaluate the effect of the filter on AMOC, three enhanced filter experiments are carried out. Compared to Lat_1, an enhanced filter can also aug-ment NADW formation, since more saline water is suppressed in the GIN seas, but accumulated in the Labrador Sea, especially in experiment Lat_2_S, which is the experiment with an enhanced filter on salinity.
【总页数】12页(490-501) 【关键词】
【作者】Xiaolan LI;Yongqiang YU;Hailong LIU;Pengfei LIN
【作者单位】State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric
Physics,
Chinese
Academy
of
Sciences,
Beijing
100029;College of Earth Science, University of Chinese Academy of Sciences, Beijing 100049;State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric
Physics,
Chinese
Academy
of
Sciences,
Beijing
100029;College of Earth Science, University of Chinese Academy of Sciences, Beijing 100049;State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric
Physics,
Chinese
Academy
of
Sciences,
Beijing
100029;College of Earth Science, University of Chinese Academy of Sciences, Beijing 100049;State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric
Physics,
Chinese
Academy
of
Sciences,
Beijing
100029;College of Earth Science, University of Chinese Academy of Sciences, Beijing 100049 【正文语种】英文 【中图分类】 【文献来源】
https://www.zhangqiaokeyan.com/academic-journal-cn_journal-meteorological-research_thesis/0201254143272.html 【相关文献】
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Sensitivity of Atlantic Meridional Overturning Circulation to the Dynamical Framework in a
