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首页> 外文OA文献 >Continuous Daily Observation of the Marine Atmospheric Boundary Layer over the Kuroshio by a Helicopter Shuttle Service
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Continuous Daily Observation of the Marine Atmospheric Boundary Layer over the Kuroshio by a Helicopter Shuttle Service

机译：直升机穿梭服务连续日观测黑潮上空的海洋大气边界层

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This paper describes a new initiative in which in situ observations of the marine atmospheric boundary layer (MABL) are made by a helicopter shuttle connecting six islands south of Tokyo. This observation method aims to make frequent measurements of temperature and moisture in the MABL across an ocean front, where direct measurements of the MABL have been limited. An onboard observation system to meet flight regulations was developed. Observed temperature and moisture as a function of pressure at 1-s intervals provided vertical profiles up to the 900-hPa level above each of the islands, from 24 December 2010 to 6 April 2011, with the exception of an accidental power down in mid-February 2011. The observed values are validated by intercomparison with surface measurements from weather stations, atmospheric soundings, and mesoscale weather analysis provided by the Japan Meteorological Agency. Temperature and moisture values obtained using the system described here at the surface are significantly correlated with those from the weather station. The meridional changes revealed by the observed vertical profiles depict rich MABL structures, such as a cold-air intrusion and a strong near-surface inversion, that are not captured by the mesoscale weather analysis. However, this discrepancy is probably due to insufficient treatment in the mesoscale numerical model rather than observational errors. Additional intercomparisons indicate no influence from either artificial mixing by the helicopter rotor or by dynamic pressure caused by the fast-moving helicopter when obtaining the vertical profiles. Following these validations, the continuation of the initiative will allow for examining the influence of the ocean front on the overlying MABL on a synoptic time scale.
机译：本文介绍了一项新举措，其中通过连接东京以南六个岛屿的直升机航天飞机对海洋大气边界层（MABL）进行原位观测。这种观测方法旨在频繁测量整个沿海地区MABL中的温度和水分，而直接测量MABL受到限制。开发了满足飞行规定的机载观察系统。从2010年12月24日至2011年4月6日，每隔1 s观察到的温度和湿度随压力的变化提供了每个岛屿上方900hPa水平的垂直剖面，但在2011年2月。观测值与日本气象厅提供的气象站的地面测量值，大气探测和中尺度天气分析进行了比较，从而得到了验证。使用此处描述的系统在地面获得的温度和湿度值与气象站的温度和湿度值显着相关。观测到的垂直剖面所揭示的子午线变化描绘了丰富的MABL结构，例如冷空气侵入和强烈的近地表反演，而中尺度天气分析没有捕获到这些子午线结构。但是，这种差异可能是由于在中尺度数值模型中的处理不充分，而不是观察误差造成的。其他比对结果表明，当获得垂直轮廓时，直升机旋翼的人工混合或快速移动的直升机造成的动压均不会产生影响。在进行了这些验证之后，该计划的继续进行将允许您在概要的时间尺度上研究海面对上覆MABL的影响。

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