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首页> 外文会议>IEEE/OES Baltic International Symposium >Ice cover determination of the lakes of Baltic and White sea basins on the base of Jason-2 satellite observations
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Ice cover determination of the lakes of Baltic and White sea basins on the base of Jason-2 satellite observations

机译：冰覆盖在杰森-2卫星观测底座上的波罗的海和白滩盆地的湖泊

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Thy work aims to development of a simple method for distinction between open water and ice cover on the base of geophysical data record (GDR) of altimetry satellite Jason-2 for large and middle-sized freshwater inland water bodies. The method is applied to the lakes of Baltic and White Seas basins: Ladoga, Onega, Vygozero and Segosero. The method for ice-water discrimination based on data of altimetry satellites was initially developed for Topex/Poseidon satellite and was successfully applied to the Caspian, Aral and other Seas and Baikal Lake. This method was based on the joint analysis of the two parameters: the backscatter coefficient at 13.6 GHz and the average value of the brightness temperature at 18 and 37 GHz and the conclusion about the ice cover can be made when these parameters exceed a certain threshold. It is shown that the method works well for large water bodies such as Ladoga and Onega Lakes and experiences significant difficulties for the middle-sized water bodies, such as Vygozero, and Segosero. This is largely due to the small amount of valid data on the backscatter coefficient for not very large water basins, which is caused by the influence of the land on the shape of the reflected altimetry pulses. For the medium water basins more productive method is based on an analysis of the difference of brightness temperatures of land and water. Along track variation of the average brightness temperature at 18.7 and 34 GHz TB/2=(TB18.7+TB34)/2 for cycles 1–179 of Jason-2 observations, constructed for winter and summer periods showed that for all lakes the difference of brightness temperatures of land and water strongly reduced when the water freezes. This allows us to determine the freezing of water based on a decrease in difference of brightness temperatures of land and water areas. Based on the proposed method we constructed time series of brightness temperature differences and demonstrated that these dependences have a pronounc- d seasonal variation for all lakes considered. The transition from summer values (open water) to winter values (ice) is sharp enough, which allowed us to determine sufficiently accurately the date of freezing of the lakes.
机译：你的工作目标，为地球物理数据记录（GDR）的测高卫星Jason-2号的基地大，中型淡水内陆水体的开放水和冰覆盖的区分的简单方法的发展。该方法适用于巴尔和白海盆地的湖泊：拉多加，奥涅加，Vygozero和Segosero。基于测高卫星的数据冰水歧视的方法最初被开发用于海洋地貌试验/海神卫星，并成功地应用于里海，咸海和其他海洋和贝加尔湖。此方法是基于两个参数的联合分析：在13.6 GHz的后向散射系数和亮度温度中的18的平均值和37 GHz和围绕冰覆盖时这些参数超过一定阈值可以被作出的结论。结果表明，该方法适用于大型水体，如拉多加和奥涅加湖和经验的中型水体显著困难，如Vygozero和Segosero。这在很大程度上是由于有效数据的所述后向散射系数的小量为不是很大的水池，它由所述反射测高脉冲的形状的土地的影响引起的。对于中等水盆地更有效率的方法是基于陆地和水亮度温度的差的分析。沿着在18.7和34 GHz的TB / 2 =（TB18.7 + TB34）的平均亮度的温度变化的轨道/ 2为周期杰森-2观察1-179，冬季和夏季区间构成表明，对于所有的湖泊的差的土地和水亮度温度的水冻结时强烈地减少。这使我们能够确定水基于土地和水域的亮度温度差下降的冻结。根据所提出的方法，我们构建的时间序列的亮度的温度差，并证明了这些相关性具有用于考虑的所有湖泊pronounc- d的季节性变化。来自加法值（开水）的冬季值（冰）的过渡是急剧不够高，这使我们能够足够精确地确定湖泊的冻结的日期。

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