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Deep and Surface Circulation in the Northwest Indian Ocean from Argo, Surface Drifter, Satellite, and In Situ Profiling Current Observations

机译:从Argo,地表漂流器,卫星和原位分析当前观测资料获得的印度洋西北部的深层和地表环流

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摘要

The physical oceanography in the northwest Indian Ocean is largely controlled by the seasonal monsoon. The seasonal variability in circulation is complex. Many studies have investigated processes in the Persian (Arabian) Gulf and Arabian Sea, but little is understood about the Sea of Oman. This thesis incorporated observations from Argo floats, surface drifters and satellite imagery to study the deep and surface circulation in the northwest Indian Ocean. An assessment of four independent moorings located in the Sea of Oman and Arabian Sea, as well as a model skill comparison of the Simple Ocean Data Assimilation (SODA) model, contributed to understanding the dynamics in this region. Spatial patterns of surface current velocity produced from surface drifter data from 1995-2009 agreed with previously known surface currents. The Somali Current, East Arabian Current, Equatorial Current, Northeast/Southwest Monsoon Current, Great Whirl and Ras al Hadd Jet were all identified. During the Southwest Monsoon, flow direction was to the east and southeast in the Arabian Sea. The Somali Current flowed northeast along the Somali Coast extending to the East Arabian Current along the Oman coast. During the Northeast Monsoon, evaporation increased over the Arabian Sea, which resulted in a salinity gradient. This imbalance caused low-salinity surface water from the northeast Indian Ocean to flow into the northwest Indian Ocean as the Northeast Monsoon Current. Current direction reversed with the change of wind direction from the Southwest Monsoon to the Northwest Monsoon. Many characteristics seen at the surface were also identified in the subsurface as deep as 1500m. The comparison of moored observations to the Argo observations co-located in space and time showed reasonable agreement with the largest salinity difference of 0.23 and largest temperature difference of 0.78?C. The Murray Ridge mooring had a temperature correlation of 0.97 when compared to Argo observations.Argo observations were compared with SODA model numerical output from 1992-2001, and, after Argo, were assimilated from 2002-2009. With assimilation of Argo data into the SODA model, the temperature and salinity from the model numerical output improved, with most differences between model numerical output and Argo observations falling within one standard deviation.
机译:印度洋西北部的自然海洋学主要受季节性季风控制。循环的季节性变化是复杂的。许多研究调查了波斯(阿拉伯)海湾和阿拉伯海的过程,但对阿曼海了解甚少。本文结合了来自Argo浮标,地表漂泊者和卫星图像的观测资料,以研究印度洋西北部的深层和地表环流。对位于阿曼海和阿拉伯海的四个独立系泊设备的评估,以及对简单海洋数据同化(SODA)模型的模型技巧比较,有助于理解该地区的动态。从1995年至2009年的表面漂移数据产生的表面电流速度的空间分布与先前已知的表面电流一致。确定了索马里洋流,东阿拉伯洋流,赤道洋流,东北/西南季风流,大涡流和拉斯哈德喷气机。在西南季风期间,流向是阿拉伯海中的东部和东南部。索马里洋流沿索马里海岸向东北流动,并延伸至阿曼沿岸的东阿拉伯洋流。在东北季风期间,阿拉伯海的蒸发增加,这导致了盐度梯度。这种不平衡导致低盐度的地表水从东北印度洋以东北季风流的形式流入西北印度洋。从西南季风到西北季风,当前的风向随着风向的变化而反向。在地下还可以识别出深达1500m的许多特征。系泊观测与时空共处的Argo观测的比较显示出合理的一致性,最大盐度差为0.23,最大温度差为0.78℃。与Argo观测值相比,Murray Ridge系泊温度相关系数为0.97.Argo观测值与1992-2001年的SODA模型数值输出进行了比较,然后在Argo之后与2002-2009年进行了同化。通过将Argo数据同化到SODA模型中,模型数值输出的温度和盐度得到改善,模型数值输出与Argo观测值之间的大部分差异都在一个标准偏差之内。

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    Stryker Sarah;

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  • 年度 2011
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