Glacier mass balance is a key component of glacier monitoring programs. Information on the mass balance of Sawir Mountains is poor due to a dearth of in-situ measurements. This paper introduces the applicability of an...Glacier mass balance is a key component of glacier monitoring programs. Information on the mass balance of Sawir Mountains is poor due to a dearth of in-situ measurements. This paper introduces the applicability of an ultra-long-range terrestrial laser scanner(TLS) to monitor the mass balance of Muz Taw Glacier, Sawir Mountains, China. The Riegl VZ?-6000 TLS is exceptionally well-suited for measuring snowy and icy terrain. Here, we use TLS to create repeated high spatiotemporal resolution DEMs, focusing on the annual mass balance(June 2, 2015 to July 25, 2016). According to TLS-derived high spatial resolution point clouds, the front variation(glacier retreat) of Muz Taw Glacier was 9.3 m. The mean geodetic elevation change was 4.55 m at the ablation area. By comparing with glaciological measurements, the glaciological elevation change of individual stakes and the TLS-derived geodetic elevation change of corresponding points matched closely, and the calculated balance was-3.864±0.378 m w.e.. This data indicates that TLS provides accurate results and is therefore suitable to monitor mass balance evolution of Muz Taw Glacier.展开更多
冰川反照率影响着冰川表面能量收支状况,其强烈的反馈机制是驱动冰川物质平衡变化的关键因素。本文基于MOD10A1和MYD10A1反照率产品、萨吾尔山冰川物质平衡大地测量法结果、木斯岛冰川实测反照率及物质平衡,开展了2000—2022年萨吾尔山...冰川反照率影响着冰川表面能量收支状况,其强烈的反馈机制是驱动冰川物质平衡变化的关键因素。本文基于MOD10A1和MYD10A1反照率产品、萨吾尔山冰川物质平衡大地测量法结果、木斯岛冰川实测反照率及物质平衡,开展了2000—2022年萨吾尔山冰川反照率变化及物质平衡估算研究。结果表明,2000—2022年,消融期内萨吾尔山冰川平均反照率下降了约0.035,变化速率约为0.0015 a^(-1)。最小反照率最早出现时间为6月16日,最晚出现时间为9月8日,平均以10 d·(10a)^(-1)的速率提前。在95%的置信水平下,木斯岛冰川反照率-物质平衡模型(A-Ms模型,即单条冰川模型)的决定系数R^(2)为0.84。基于冰川编目及现场环境考察,将萨吾尔山冰川划分为冰斗冰川、山谷冰川和悬冰川,对应类型的A-Mr模型(区域冰川模型)的决定系数R^(2)分别为0.81、0.74和0.72。2000—2020年,A-Ms模型重建萨吾尔山冰川物质平衡值为-1.24 m w.e.·a^(-1),A-Mr模型相应的重建值为-0.90 m w.e.·a^(-1),A-Mr模型模拟结果更能反映萨吾尔山冰川的物质损失状况。与亚洲高山区各山地冰川相比,萨吾尔山冰川物质损失最大。展开更多
冰川作为地球主要的冰冻圈要素之一,蕴藏着丰富的微生物资源。本文通过培养和16S r RNA基因序列鉴定,研究了新疆北部木斯岛冰川的表层雪、表层冰、深层冰、表层融水和前沿土壤生境中的可培养细菌群落结构。结果表明,从木斯岛冰川中培养...冰川作为地球主要的冰冻圈要素之一,蕴藏着丰富的微生物资源。本文通过培养和16S r RNA基因序列鉴定,研究了新疆北部木斯岛冰川的表层雪、表层冰、深层冰、表层融水和前沿土壤生境中的可培养细菌群落结构。结果表明,从木斯岛冰川中培养的细菌属于拟杆菌门(Bacteroidetes)、变形菌门(Proteobacteria)、奇异球菌-栖热菌门(Deinococcus-Thermus)和放线菌门(Actinobacteria),优势门为变形菌门和放线菌门,占所有分离菌株数量的78%。优势属为黄杆菌属(Flavobacterium)、假单胞菌属(Pseudomonas)和冷杆菌属(Cryobacterium),有15株细菌为潜在新种。在10℃和25℃下培养的菌落数分别为6.0×10^(1)~5.3×10^(3)CFU·m L^(-1)(CFU·g^(-1))和3.1×10^(1)~5.1×10^(3)CFU·m L^(-1)(CFU·g^(-1))。木斯岛冰川不同生境物种多样性差异较大,前沿土壤生境物种多样性最高,表层融水生境物种多样性最低。可培养细菌具有生境特异性,表层雪、表层冰、深层冰和前沿土壤生境分别有2、2、1和19个特有的属,假单胞菌属是五种生境的共有属,许多源自雪的细菌类群可以在不同生境中保存下来。在10℃和25℃下共培养出16个共有属,分别有9个和7个特有属。木斯岛冰川蕴含丰富的菌株多样性,可为开发冰川微生物资源提供数据支持和菌株资源。展开更多
基金supported by the National Natural Science Foundation of China(41601076,41471058 nd 91425303)the"Light of West China"program for Talent Introduction of Chinese Academy
文摘Glacier mass balance is a key component of glacier monitoring programs. Information on the mass balance of Sawir Mountains is poor due to a dearth of in-situ measurements. This paper introduces the applicability of an ultra-long-range terrestrial laser scanner(TLS) to monitor the mass balance of Muz Taw Glacier, Sawir Mountains, China. The Riegl VZ?-6000 TLS is exceptionally well-suited for measuring snowy and icy terrain. Here, we use TLS to create repeated high spatiotemporal resolution DEMs, focusing on the annual mass balance(June 2, 2015 to July 25, 2016). According to TLS-derived high spatial resolution point clouds, the front variation(glacier retreat) of Muz Taw Glacier was 9.3 m. The mean geodetic elevation change was 4.55 m at the ablation area. By comparing with glaciological measurements, the glaciological elevation change of individual stakes and the TLS-derived geodetic elevation change of corresponding points matched closely, and the calculated balance was-3.864±0.378 m w.e.. This data indicates that TLS provides accurate results and is therefore suitable to monitor mass balance evolution of Muz Taw Glacier.
文摘冰川反照率影响着冰川表面能量收支状况,其强烈的反馈机制是驱动冰川物质平衡变化的关键因素。本文基于MOD10A1和MYD10A1反照率产品、萨吾尔山冰川物质平衡大地测量法结果、木斯岛冰川实测反照率及物质平衡,开展了2000—2022年萨吾尔山冰川反照率变化及物质平衡估算研究。结果表明,2000—2022年,消融期内萨吾尔山冰川平均反照率下降了约0.035,变化速率约为0.0015 a^(-1)。最小反照率最早出现时间为6月16日,最晚出现时间为9月8日,平均以10 d·(10a)^(-1)的速率提前。在95%的置信水平下,木斯岛冰川反照率-物质平衡模型(A-Ms模型,即单条冰川模型)的决定系数R^(2)为0.84。基于冰川编目及现场环境考察,将萨吾尔山冰川划分为冰斗冰川、山谷冰川和悬冰川,对应类型的A-Mr模型(区域冰川模型)的决定系数R^(2)分别为0.81、0.74和0.72。2000—2020年,A-Ms模型重建萨吾尔山冰川物质平衡值为-1.24 m w.e.·a^(-1),A-Mr模型相应的重建值为-0.90 m w.e.·a^(-1),A-Mr模型模拟结果更能反映萨吾尔山冰川的物质损失状况。与亚洲高山区各山地冰川相比,萨吾尔山冰川物质损失最大。
文摘冰川作为地球主要的冰冻圈要素之一,蕴藏着丰富的微生物资源。本文通过培养和16S r RNA基因序列鉴定,研究了新疆北部木斯岛冰川的表层雪、表层冰、深层冰、表层融水和前沿土壤生境中的可培养细菌群落结构。结果表明,从木斯岛冰川中培养的细菌属于拟杆菌门(Bacteroidetes)、变形菌门(Proteobacteria)、奇异球菌-栖热菌门(Deinococcus-Thermus)和放线菌门(Actinobacteria),优势门为变形菌门和放线菌门,占所有分离菌株数量的78%。优势属为黄杆菌属(Flavobacterium)、假单胞菌属(Pseudomonas)和冷杆菌属(Cryobacterium),有15株细菌为潜在新种。在10℃和25℃下培养的菌落数分别为6.0×10^(1)~5.3×10^(3)CFU·m L^(-1)(CFU·g^(-1))和3.1×10^(1)~5.1×10^(3)CFU·m L^(-1)(CFU·g^(-1))。木斯岛冰川不同生境物种多样性差异较大,前沿土壤生境物种多样性最高,表层融水生境物种多样性最低。可培养细菌具有生境特异性,表层雪、表层冰、深层冰和前沿土壤生境分别有2、2、1和19个特有的属,假单胞菌属是五种生境的共有属,许多源自雪的细菌类群可以在不同生境中保存下来。在10℃和25℃下共培养出16个共有属,分别有9个和7个特有属。木斯岛冰川蕴含丰富的菌株多样性,可为开发冰川微生物资源提供数据支持和菌株资源。
