Seasonality and variations in moisture-supply on different timescales (1-104 yrs) and their relation to surface processes in the NW Himalaya

不同时间尺度（1-104年）水分供应的季节性和变化及其与喜马拉雅山西北部地表过程的关系

• 批准号: 159234416
• 负责人: Professor Dr. Manfred Strecker, Ph.D.
• 金额: --
• 依托单位: Sektion 4.3: Klimadynamik und Landschaftsentwicklung
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/159234416?language=en
• 关键词: Seasonality; variations; moisture; supply; different

One of the outstanding questions in (paleo)climate research in the Himalaya and the adjacent mountainous areas in Central Asia concerns seasonality and the source of moisture. In this context, we intend to study in detail two of the dominant landscape-shaping processes generally associated with seasonal moisture supply: (1) glacial erosion and deposition, which are highly sensitive to spatiotemporal trends in moisture transport, and (2) landslides and associated processes that control hillslope decay. This proposal will analyze geomorphic processes on 1 to 104 yrs timescales and on 102 to 1010 m2 spatial scales. First, we strive to understand the present¬day synoptic moisture characteristics and their relation to local topography. We will use remotely-sensed rainfall and snow-cover data combined with field measurements of glacial velocities and snow depths on a weekly to annual basis. This will be complemented by field observation and change-detection techniques from satelliteimagery time series of the last 4 decades to identify and quantify landscape changes from hillslope to river-basin scales along the climatic gradient of the Himalaya. Second, we will use cosmogenic nuclide dating and geomorphic analysis to construct a detailed chronology of glacial and hillslope processes in a key region of the NW Himalaya that lies in the transition between the main moisture sources. This will allow deciphering the relative influence of erosive processes during climatic oscillations in the Indian Monsoon system. Overall, we expect to provide much needed data on the hydrologic budget of the Himalaya and the provenance of eroded sediments.

喜马拉雅山和中亚邻近山区的（古）气候研究中的突出问题之一涉及季节性和水分来源。在这种背景下，我们打算详细研究通常与季节性水分供应相关的两个主要景观塑造过程：（1）冰川侵蚀和沉积，对水分输送的时空趋势高度敏感，以及（2）山体滑坡和控制山坡腐烂的相关过程。该提案将分析 1 至 104 年时间尺度和 102 至 1010 平方米空间尺度的地貌过程。首先，我们努力了解当今的天气湿度特征及其与当地地形的关系。我们将使用遥感降雨和积雪数据，结合每周到每年对冰川速度和积雪深度的现场测量。这将得到过去 40 年卫星图像时间序列的现场观测和变化检测技术的补充，以识别和量化沿喜马拉雅山气候梯度从山坡到河流盆地尺度的景观变化。其次，我们将利用宇宙成因核素测年和地貌分析来构建喜马拉雅西北部主要湿气源过渡地区关键地区冰川和山坡过程的详细年代学。这将有助于破译印度季风系统气候振荡期间侵蚀过程的相对影响。总体而言，我们希望提供有关喜马拉雅山水文预算和侵蚀沉积物来源的急需数据。