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地球磁场过去20年间的变化名为“奥斯忒”（Oersted）的磁场强度测量卫星（封面照片上形状为铅笔形的卫星）目前正在轨道上运行,收集关于地球磁场的数据。将该卫星的测量结果与1980年在轨道上运行的“磁场卫星”（Magsat）获得的数据进行比较,使得科学家有可能对过去20年间地球磁场所发生的小规模变化进行绘图分析。结果表明,强烈的变化发生在两个区域,目前的地球动力状态与数值模拟结果类似,地球动力系统的不对称性质会让人们想到在地球磁场逆转前有可能出现的状态。热带河流湿地的CO2排放地面观测研究工作所做出的估计是,热带地区是一个净碳汇。这个结果与最近根据碳循环模拟所得到的计算结果是不一致的,后者表明,热带地区如
Changes in Earth's Magnetic Field Over the Past Two Decades Oersted's magnetic field strength satellites (pencil-shaped satellites on the cover photo) are currently in orbit to collect data about the Earth's magnetic field. Comparing the satellite's measurements with data from Magsat, orbiting in 1980, has made it possible for scientists to graphically analyze the small-scale changes in the earth's magnetic field over the past two decades. The results show that strong changes occur in the two regions. The current state of geodynamics is similar to the numerical simulation. The asymmetric nature of the geodynamics system will make people think of the possible state before the reversal of the Earth's magnetic field. It is estimated that the ground-based CO2 emissions from tropical river wetlands are estimated to be a net carbon sink in the tropics. This result is inconsistent with recent calculations based on carbon cycle simulations, which show that tropical regions such as