南大西洋海面风场时空特征分析  

CHARACTERISTICS ANALYSIS OF WIND FIELD OVER THE SOUTH ATLANTIC OCEAN

作　　者：闫明[1] 刘金芳[1] 杨亮[1] 李颜[1] 

机构地区：[1]海军海洋水文气象中心,北京100073

出　　处：《海洋预报》2004年第1期27-34,共8页Marine Forecasts

摘　　要：本文根据1950年～1995年共46a的南大西洋船舶气象报资料，按1°×1°和5°×5°网格统计的海面风进行分析研究。通过分析每月各要素的等值线分布图，得出南大西洋海面风场季节变化不如北大西洋显著，但仍有较明显的季节变化，冬季比夏季强盛，相应的平均风速较大，6、8级大风频率也较高。位于赤道和25°S之间的信风区，主要盛行东南风；副热带高压带，风速小，风向变化不定；35°S以南的西风带风力较强。对这些规律的总结归纳，为该地区的各种活动提供了较为翔实的海面风场变化规律。On the basis of the marine meteorological data in the South Atlantic Ocean during 1950~1995, we analyzed the sea wind by taking 1°×1° and 5°×5° latitude and longitude as statistical grids. From the analyse of the distributing of the monthly wind element's isopleths of the wind field, we concluded that the seasonal variety of the wind field over this area is prominent, the average wind and the frequency distribution of wind force 6,8 is higher though it is not representative as the North Atlantic Ocean, and the wind in winter is stronger than in summer. The direction of the trade wind between the equator and 25°S is almost southeast. The wind direction in the subtropical high-pressure area is protean variable. The west wind is more stronger in the zone south form 40°S. This article provides specific data of wind field for ships sailing, working and scientific action in the South Atlantic Ocean

关 键 词：风场 气压场 南大西洋 季节变化 

分 类 号：P725.9[天文地球—海洋科学] P732