Air mass trajectories to Summit, Greenland: A 44‐year climatology and some episodic events
Air mass trajectories to Summit, Greenland: A 44‐year climatology and some episodic events
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DOI：
10.1029/97jc00296
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发表时间：
1997-11
影响因子：
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通讯作者：
J. Kahl;Dewayne A. Martinez;H. Kuhns;C. Davidson;J. Jaffrezo;J. Harris
中科院分区：
文献类型：
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作者：
J. Kahl;Dewayne A. Martinez;H. Kuhns;C. Davidson;J. Jaffrezo;J. Harris
使用44年的记录，每天，10天，等压线的轨迹在500百帕水平的大气输送模式的季节变化，格陵兰岛首脑会议，检查。超过24，000个建模轨迹使用聚类分析聚合成不同的模式。在冬季，到达顶峰的十天轨迹最长，其中67%的轨迹在逆风（向西）方向延伸，最远可到达亚洲或欧洲。夏季的路径最短，46%的路径在北美上空停留10天。在所有季节中，有一小部分（3-7%）的路径源自西亚/欧洲，在从西北方向接近顶峰之前在北冰洋上空沿赤道路径行进。700百帕的路径往往比500百帕的路径短，其中许多来自北美的700百帕路径经过北大西洋，从南面接近萨米特。Summit的远距离输送气候学类似于为Dye 3准备的全年气候学，Dye 3位于南部900公里处[Davidson等人，1993年b]。对1994年夏季在Summit测得的几种气溶胶的分析揭示了使用远程空气轨迹来解释化学数据的有用性和局限性。
The seasonal variation in atmospheric transport patterns to Summit, Greenland, is examined using a 44-year record of daily, 10-day, isobaric back trajectories at the 500-hPa level. Over 24,000 modeled trajectories are aggregated into distinct patterns using cluster analysis. Ten-day trajectories reaching Summit are longest during winter, with 67% extending upwind (westward) as far back as Asia or Europe. Trajectories are shortest during summer, with 46% having 10-day origins over North America. During all seasons a small percentage (3–7%) of trajectories originate in west Asia/Europe and follow a meridional path over the Arctic Ocean before approaching Summit from the northwest. Trajectories at the 700-hPa level tend to be shorter than at 500 hPa, with many of the 700-hPa trajectories from North America tracking over the North Atlantic and approaching Summit from the south. The long-range transport climatology for Summit is similar to a year-round climatology prepared for Dye 3, located 900 km to the south [Davidson et al., 1993b]. An analysis of several aerosol species measured at Summit during summer 1994 reveals examples of the usefulness and also the limitations of using long-range air trajectories to interpret chemical data.