南极冰盖质量变化与全球海平面和气候变化紧密相关.本文使用了去相关滤波P3M6结合300kmFan滤波的组合滤波方案,利用2002年8月至2010年6月的GRACE(Gravity Recovery and Climate Explorer)时变重力场数据反演南极地区地表质量变化,扣除...南极冰盖质量变化与全球海平面和气候变化紧密相关.本文使用了去相关滤波P3M6结合300kmFan滤波的组合滤波方案,利用2002年8月至2010年6月的GRACE(Gravity Recovery and Climate Explorer)时变重力场数据反演南极地区地表质量变化,扣除冰后回弹的影响和泄漏误差后获得了南极冰盖质量变化.结果表明:南极冰盖呈现加速消融趋势,冰盖质量消融速率为80.0Gt/a,对海平面上升的贡献为0.22mm/a,其中西南极地区冰盖质量消融速率为78.3Gt/a,东南极地区冰盖质量趋于平衡,年变化速率为1.6Gt/a;南极地区冰盖质量消融的平均变化率由2002～2005年的39.3Gt/a增大到2006～2010年的104.2Gt/a,其对海平面的影响由2002～2005年的0.11mm/a增大到2006～2010年的0.29mm/a,表明南极地区冰盖正处于加速消融阶段;2006～2008年东南极沿海岸区域Ender by Land和Wilkes Land冰盖质量积累速率减小,但2009年后其冰盖质量呈现较大幅度的增加.展开更多
It is important to quantify mass variations in the Antarctic ice sheet hybrid filtering scheme employing a combination of the decorrelated to study the global sea-level rise and climate change. A filter P3M6 and 300 k...It is important to quantify mass variations in the Antarctic ice sheet hybrid filtering scheme employing a combination of the decorrelated to study the global sea-level rise and climate change. A filter P3M6 and 300 km Fan filter was used, and the sur- face mass variations over the Antarctic are recovered from GRACE CSR RL04 monthly gravity field models from August 2002 to June 2010. After deduction of leakage errors using the GLDAS hydrological model and postglacial rebound effects using the glacial isostatic adjustment model IJ05, the variations in the ice sheet mass are obtained. The results reveal that the rate of melting of the Antarctic ice sheet is 80.0 Gt/a and increasing and contributes 0.22 mm/a to the global sea-level rise; the mass loss rate is 78.3 Gt/a in the West Antarctic and 1.6 Gt/a in the East Antarctic. The average mass loss rate increases from 39.3 Gt/a for the period 2002-2005 to 104.2 Gt/a for the period 2006-2010, and its corresponding contribution to the global sea-level rise increases from 0.11 to 0.29 mm/a, which indicates accelerated ice mass loss over the Antarctic since 2006. Moreover, the mass accumulation rates for Enderby Land and Wilkes Land along the coast of East Antarctica decrease for the period 2006-2008 but increase evidently after 2009.展开更多
探明南极冰盖物质平衡状况,对研究全球变暖背景下海平面变化具有重要意义,也是南极冰川学的重要基础工作.在ITASE计划(International Trans Antarctic Scientific Expedition)和ISMASS计划(Ice Sheet MassBalance and Sea Level)的指导...探明南极冰盖物质平衡状况,对研究全球变暖背景下海平面变化具有重要意义,也是南极冰川学的重要基础工作.在ITASE计划(International Trans Antarctic Scientific Expedition)和ISMASS计划(Ice Sheet MassBalance and Sea Level)的指导下,各国科学家对南极几个主要流域进行了大范围的实地观测,获取了一些重要成果.此外,由于极地测高卫星和重力卫星的应用,南极冰盖整体物质平衡状况评估在近期得到长足发展.无论是实地研究还是卫星遥感,都有其局限性,两者结合可以弥补各自的缺陷,是未来研究的主要发展方向,但目前仍未引起足够的重视.因此,本文综述了南极冰盖物质平衡研究的最新研究进展,将有关研究分局域和洲际尺度进行了介绍,并对国内的研究提出建议.展开更多
文摘南极冰盖质量变化与全球海平面和气候变化紧密相关.本文使用了去相关滤波P3M6结合300kmFan滤波的组合滤波方案,利用2002年8月至2010年6月的GRACE(Gravity Recovery and Climate Explorer)时变重力场数据反演南极地区地表质量变化,扣除冰后回弹的影响和泄漏误差后获得了南极冰盖质量变化.结果表明:南极冰盖呈现加速消融趋势,冰盖质量消融速率为80.0Gt/a,对海平面上升的贡献为0.22mm/a,其中西南极地区冰盖质量消融速率为78.3Gt/a,东南极地区冰盖质量趋于平衡,年变化速率为1.6Gt/a;南极地区冰盖质量消融的平均变化率由2002～2005年的39.3Gt/a增大到2006～2010年的104.2Gt/a,其对海平面的影响由2002～2005年的0.11mm/a增大到2006～2010年的0.29mm/a,表明南极地区冰盖正处于加速消融阶段;2006～2008年东南极沿海岸区域Ender by Land和Wilkes Land冰盖质量积累速率减小,但2009年后其冰盖质量呈现较大幅度的增加.
基金supported by the National Basic Research Program of China (Grant No. 2007CB714405)the National Natural Science Foundation of China (Grant No. 40874002)the Program for New Century Excellent Talents in University (Grant No. NCET-07-0635)
文摘It is important to quantify mass variations in the Antarctic ice sheet hybrid filtering scheme employing a combination of the decorrelated to study the global sea-level rise and climate change. A filter P3M6 and 300 km Fan filter was used, and the sur- face mass variations over the Antarctic are recovered from GRACE CSR RL04 monthly gravity field models from August 2002 to June 2010. After deduction of leakage errors using the GLDAS hydrological model and postglacial rebound effects using the glacial isostatic adjustment model IJ05, the variations in the ice sheet mass are obtained. The results reveal that the rate of melting of the Antarctic ice sheet is 80.0 Gt/a and increasing and contributes 0.22 mm/a to the global sea-level rise; the mass loss rate is 78.3 Gt/a in the West Antarctic and 1.6 Gt/a in the East Antarctic. The average mass loss rate increases from 39.3 Gt/a for the period 2002-2005 to 104.2 Gt/a for the period 2006-2010, and its corresponding contribution to the global sea-level rise increases from 0.11 to 0.29 mm/a, which indicates accelerated ice mass loss over the Antarctic since 2006. Moreover, the mass accumulation rates for Enderby Land and Wilkes Land along the coast of East Antarctica decrease for the period 2006-2008 but increase evidently after 2009.
文摘探明南极冰盖物质平衡状况,对研究全球变暖背景下海平面变化具有重要意义,也是南极冰川学的重要基础工作.在ITASE计划(International Trans Antarctic Scientific Expedition)和ISMASS计划(Ice Sheet MassBalance and Sea Level)的指导下,各国科学家对南极几个主要流域进行了大范围的实地观测,获取了一些重要成果.此外,由于极地测高卫星和重力卫星的应用,南极冰盖整体物质平衡状况评估在近期得到长足发展.无论是实地研究还是卫星遥感,都有其局限性,两者结合可以弥补各自的缺陷,是未来研究的主要发展方向,但目前仍未引起足够的重视.因此,本文综述了南极冰盖物质平衡研究的最新研究进展,将有关研究分局域和洲际尺度进行了介绍,并对国内的研究提出建议.
