Correlative Antarctic and Inter-Hemispheric Dynamics Studies Using the MF Radar at Rothera

这项提议是继续使用1996年部署在英国南极站Rothera的中频(Mf，1-30兆赫)中层雷达进行作业和科学研究。该系统现在是南极中频雷达链的关键位置，接近68度。S，还包括Syowa(日本)和Davis(澳大利亚)站的中频雷达。该雷达包括Rothera正在开发的用于中层-热层(MLT)研究的成套仪器的WINS部分--这是新的BAS五年计划的重点，该计划还包括Fe温度激光雷达(以前在南极)和用于重力波研究的中层顶气辉成像仪(以前在哈雷)。Rothera MF雷达刚刚升级了天线和电子设备，以实现更好的信噪比，并在高度和时间上进行更连续的测量。拟议研究的主要重点是扩展极地中间层动力学的知识。Rothera的仪器套件非常适合与阿拉斯加Poker Flat的北半球遗址进行相关的半球间研究(65°。N)和挪威阿洛马市(69度N)具有可比的仪器。在继续供资的情况下开展的进一步研究工作将侧重于：(1)在Rothera进行多仪器协作研究，以尽可能充分地量化该地点MLT的动力学、结构和变异性；(2)南极大尺度动力学和变异性的多站点(和多仪器)研究(以及Davis和Syowa的雷达和其他仪器)；以及(3)在Poker Flat和Alomar使用仪器(如纳共振激光雷达和MF雷达)进行的跨半球研究。预计这些研究将导致更详细地了解(1)极地纬度的平均、潮汐和行星波结构，(2)这些结构的季节、年际和短期变化，(3)不同源和波相互作用条件引起的潮汐和行星波结构的半球差异，以及(4)重力波在两个半球的相对影响。这类研究还将有助于更普遍地提高对高纬度过程在全球大气动力学和可变性中的作用的认识。

This proposal is to continue operation and scientific studies with the middle-frequency (MF, 1-30 MHz) mesospheric radar deployed at the British Antarctic station Rothera in 1996. This system is now a key site in the Antarctic MF radar chain near 68 deg. S, which includes also MF radars at Syowa (Japan) and Davis (Australia) stations. This radar comprises the winds component of a developing instrument suite for the mesosphere-thermosphere (MLT) studies at Rothera - a focus of the new BAS 5-year plan, which also includes the Fe temperature lidar (formerly at South Pole) and the mesopause airglow imager for gravity wave studies (formerly at Halley). The Rothera MF radar has just had its antennas and electronics upgraded to achieve better signal-to-noise ratio and more continuous measurements in height and time. The main focus of the proposed research is to extend the knowledge of the polar mesosphere dynamics. The instrument suite at Rothera is ideally positioned for correlative interhemispheric studies with northern hemisphere sites at Poker Flat, Alaska (65 deg. N) and ALOMAR, Norway (69 deg. N) having comparable instrumentation. Further research efforts performed with continued funding will focus on: (1) multi-instrument collaborative studies at Rothera to quantify as fully as possible the dynamics, structure, and variability of the MLT at that location, (2) multi-site (and multi-instrument) studies of large-scale dynamics and variability in the Antarctic (together with the radars and other instrumentation at Davis and Syowa), and (3) interhemispheric studies employing instruments (e.g., the Na resonance lidar and MF radar) at Poker Flat and ALOMAR. It is expected that these studies will lead to a more detailed understanding of (1) mean, tidal, and planetary wave structures at polar latitudes, (2) seasonal, inter-annual, and short-term variability of these structures, (3) hemispheric differences in the tidal and planetary wave structures arising from different source and wave interaction conditions, and (4) the relative influences of gravity waves in the two hemispheres. Such studies will also contribute more generally to an increased awareness of the role of high-latitude processes in global atmospheric dynamics and variability.