【摘要】 湖冰是气候变化的指示器,为分析纳木错地区气候对湖冰冰情的影响,利用2006—2011年西藏纳木错(面积2000km2)和白马纳木错(面积1.45 km2)湖冰的观测资料,结合MODIS遥感影像资料分析了两个湖泊完全冻结日期、完全解冻日期、封冻期、湖冰厚度的状况及其与气温和风速的关系。纳木错湖湖冰冰情主要受气温的影响,同时也受风速的影响。纳木错湖的完全冻结日期集中在2月,完全解冻日期在5月中旬,封冻期平均天数为90 d,封冻期与冬季负积温具有较好的对应关系。面积较小的白马纳木错冰情的年际波动较大,其平均封冻期为124 d。纳木错湖的最大冰厚一般出现在3月,其厚度为58~65 cm。更多还原

【Abstract】 Lake ice is a good indicator of climate change.In order to analyse the impact of climate on lake ice,we use in situ data as well as remote sensing images to determine the dates of freeze-up and break-up,thickness of lake ice of the Nam Co(2000 km2) and Baima Nam Co(1.45 km2) in the Tibetan Plateau from 2006 to 2011.Combined with meteorological parameters,we found that lake ice in Nam Co is mainly influenced by air temperature,and wind speed also plays an important role in this process.Date of freeze-up and break-up for Nam Co is in February and mid-May,respectively,with an average of 90 days for freeze-up period.Lake ice exhibits relatively larger variability in Baima Nam Co with an average of 124 days for freeze-up period.There is a close relationship between freeze-up period and the negative accumulated temperature.Maximum thickness of the lake ice in the Nam Co occurs in March ranging 58-65 cm.更多还原