| 高亚洲及其邻区2003~2017年质量平衡的气候影响分析 |
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| 引用本文： | 汪汉胜,张会同,相龙伟,江利明,沈 强,STEFFEN Holger.高亚洲及其邻区2003~2017年质量平衡的气候影响分析[J].大地测量与地球动力学,2020,40(12):1211-1218. |
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| 作者姓名： | 汪汉胜 张会同 相龙伟 江利明 沈 强 STEFFEN Holger |
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| 摘 要： | 利用重力恢复和气候实验(GRACE)数据获得高亚洲及其邻近地区的质量变化，可分析区域气候因素如印度季风、西风带和厄尔尼诺-南方涛动(ENSO)对结果的影响。然而，最近的研究发现，西风带的贡献小于厄尔尼诺，与传统研究结论不同。因此，利用2003-01~2017-06期间GRACE RL06的Mascon数据进行复经验正交函数（CEOF）分析。研究发现，前3个主要成分对研究区质量变化的贡献率分别为53%、27%和6%，与印度季风、西风带和ENSO指数的相关系数分别是0.92±0.16、0.70±0.15和0.42±0.15，说明在长达14 a的观测时间跨度内，印度季风、西风带和ENSO对研究区质量变化的贡献分别为53%、27%和6%，西风带是研究区质量变化的第2个影响因素，这支持了传统的研究结论；ENSO通过印度季风对某些区域（如帕米尔高原、喜马拉雅山脉和印度西北部）的质量变化产生影响；在印度西北部、喜马拉雅山脉和藏东南地区，由于印度季风的减弱及其相关的ENSO作用和西风带的加强，质量变化呈现下降趋势；在兴都库什、西昆仑和东昆仑地区，由于西风带的增强，质量变化呈上升的趋势；在帕米尔和天山地区，虽然受到较强西风带的影响，但由于同时受到印度季风和ENSO减弱以及气温上升趋势的影响，质量变化呈下降的趋势。
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| 关 键 词： | 高亚洲 GRACE 质量平衡 CEOF 气候影响因子 |
Effects of Climatic Factors on the Mass Balance from 2003 to 2017 in High Mountain Asia and Adjacent Areas |
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| WANG Hansheng,ZHANG Huitong,XIANG Longwei,JIANG Liming,SHEN Qiang,STEFFEN Holger.Effects of Climatic Factors on the Mass Balance from 2003 to 2017 in High Mountain Asia and Adjacent Areas[J].Journal of Geodesy and Geodynamics,2020,40(12):1211-1218. |
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| Authors: | WANG Hansheng ZHANG Huitong XIANG Longwei JIANG Liming SHEN Qiang STEFFEN Holger |
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| Abstract: | Mass changes derived from gravity recovery and climate experiment(GRACE) data in high mountain Asia(HMA) and adjoining areas can be used to investigate the effects of regional climate factors such as the Indian monsoon, westerlies and El Nio-Southern Oscillation(ENSO). However, one recent study had a different viewpoint for the role of the westerlies in HMA than traditional studies. Thus, we turn to improved estimates of mass changes, derived the GRACE Release 06 Mascon solution from January 2003 to June 2017, and perform a novel complex empirical orthogonal function(CEOF) analysis. We find that the contributions to the mass changes in our study area, corresponding to the top three principal components, are 53%, 27% and 6%, and their correlation coefficients with Indian monsoon, westerlies and ENSO index data are as large as 0.92±0.16, 0.70±0.15, and 0.42±0.15, respectively. This suggests that the Indian monsoon, westerlies and ENSO could account for 53%, 27% and 6%, respectively, of the mass changes in the study area during the observation time span of 14 years. Considering our whole study area, the effect of westerlies is the second important one for mass changes, which supports most previous studies. We also find that ENSO exerts its effects on mass changes in specific areas(e.g., Pamir mountains, Himalayas and northwest India) through the linked Indian monsoon. Northwest India, the Himalayas and southeast Tibet are found to show a declining trend of mass changes, caused by the weakening Indian monsoon and the related ENSO, and the strengthening westerlies. The Hindu Kush, and the west and east Kunlun mountains are found to show an ascending trend of mass changes mainly due to stronger westerlies. Although influenced by the stronger westerlies, the Pamir mountains and the Tienshan show a declining trend of mass changes, since they are also affected by the weakening Indian monsoon and ENSO together with increasing air temperature trends. |
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| Keywords: | high mountain Asia GRACE mass balance CEOF climate impact factors |
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