基于卫星数据的北极海冰长期变化研究

发布时间：2018-05-17 22:13

本文选题：北极 + 海冰密集度　；参考：《中国海洋大学》2014年硕士论文

【摘要】：海冰是极地气候重要组成部分。卫星遥感技术的应用也使得对海冰大尺度，长时间序列的研究成为可能。卫星数据显示，近年来北极海冰覆盖急剧下降。本文采用1982-2004年NOAA/AVHRR反照率，，海表温度数据和Nimbus-7/SMMR，DMSP/SSM/I海冰密集度数据进行讨论分析。选取了七个北极海域，分别位于格陵兰海（海域A）、巴伦支海（海域B）、喀拉海（海域C）、拉普捷夫海（海域D）、东西伯利亚海及其邻近海域（海域E）、楚科奇海及其邻近海域（海域F）和波弗特海及其邻近海域（海域G），对北极海冰长期变化进行了研究。格陵兰海域和巴伦支海域夏季反照率,海冰密集度较低，多为无冰海面；喀拉海域、拉普捷夫海域、东西伯利亚海及其邻近海域六月份反照率,海冰密集度较高，七、八月份海冰加速融化，海冰密集度下降明显；楚科奇海和波弗特海及其邻近海域夏季反照率、海冰密集度较高。反照率与海冰密集度的夏季区域平均序列相关性比较高，最低相关系数为0.51，最高相关系数为0.94。分析23年夏季海表温度和海冰密集度的时间序列发现，不同海域不同月份呈现出不同相关性。 1982-2004年,七个海域反照率和海冰密集度均呈现下降趋势，西部的楚科奇海和波弗特海及其邻近海域下降速度最快，巴伦支海域下降速度最慢。海域E、海域F和海域G海表温度呈现上升趋势；海域B和海域D海温呈现下降趋势，且海域B较海域D下降速度快；海域A和海域C海表温度变化趋势不明显。海表温度和海冰密集度数据主成分分析结果显示，1982-2004年七个海域海冰密集度第一模态均呈现下降趋势。海域B和海域D海表温度第一模态时间序列均呈现下降趋势，海域E、海域F和海域G呈现上升趋势，海域A和海域C变化趋势不明显。与区域月平均序列变化趋势一致。对海表温度和海冰密集度第一模态时间序列进行傅里叶频谱和小波频谱分析，结果显示均存在显著地年际变化。
[Abstract]:Sea ice is an important component of polar climate. The application of satellite remote sensing technology also makes it possible to study the large-scale and long-time series of sea ice. Satellite data show a sharp decline in Arctic sea ice cover in recent years. In this paper, NOAA/AVHRR albedo, sea surface temperature data and Nimbus-7 / SMMR-DMSPSPSSM / I sea ice density data from 1982 to 2004 are used for discussion and analysis. Seven Arctic waters were selected, Located in the Greenland Sea (Agnes), the Barents Sea (Bu), the Kera Sea (sea area Che, the Sea of Laptev), the East Siberian Sea and its adjacent sea areas (sea area Epium, the Chukchi Sea and its adjacent waters (Sea F) and Beaufort), respectively. The long-term variation of Arctic sea ice is studied. The summer albedo in Greenland and Barents Sea area is relatively low, mostly ice-free sea level; in Kera Sea area, Laptev Sea area, East Siberian Sea area and its adjacent sea area, the albedo is high in June, and the sea ice density is high, 7. In August, the sea ice melting accelerated, the sea ice density decreased obviously, and the sea ice density was higher in the Chukchi Sea, Beaufort Sea and its adjacent waters in summer. The correlation between albedo and the summer mean sequence of sea ice concentration is relatively high, the lowest correlation coefficient is 0.51and the highest correlation coefficient is 0.94. By analyzing the time series of sea surface temperature and sea ice density in 23 years, it is found that different sea areas show different correlations in different months. From 1982 to 2004, the albedo and sea ice density of the seven sea areas all showed a downward trend. The western Chukchi Sea, Beaufort Sea and its adjacent sea areas declined the fastest, and the Barents Sea region the slowest. Sea area E, sea area F and sea area G showed an upward trend, sea area B and sea area D showed a downward trend, and sea area B decreased faster than sea D, and sea area A and C showed no obvious trend of change of sea surface temperature. The principal component analysis results of sea surface temperature and sea ice concentration data show that the first modes of sea ice concentration in seven sea areas from 1982 to 2004 all show a downward trend. The first mode time series of sea surface temperature in sea area B and D showed a downward trend, while in sea area E, F and G showed an upward trend, but the variation trend of sea area A and C was not obvious. The trend is consistent with the regional average monthly sequence. The first mode time series of sea surface temperature and sea ice density are analyzed by Fourier spectrum and wavelet spectrum. The results show that there are significant interannual variations in the first mode time series of sea surface temperature and sea ice concentration.
【学位授予单位】：中国海洋大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P731.15

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