Tropical Glaciers and Climate

这是EAR8317722的续订。该项目涉及热带冰川及其对气候强迫的反应。在热带不同高山地区十多年的研究成果的基础上，未来几年的研究将集中在肯尼亚山的冰川上，在较小程度上将集中在秘鲁科迪莱拉·布兰卡的冰块上。到1990年要完成的一项主要任务是绘制比例尺为L：5,000的肯尼亚所有冰川的地图。与1963年的测绘相结合，这将记录过去四分之一个世纪的冰川变化，并作为最近和未来对末端变化的测量的控制。这项任务需要在1987-89年间通过地面测量建立控制点，在1989-90年间通过航空摄影测量建立控制点。刘易斯冰川应按1：2,500比例尺重新绘制1990年3月基准面的地图。对刘易斯冰川的降水、净平衡和冰流速度的观测将继续进行。这些形成了关于质量和热量预算的强迫-响应关系的定量公式的基础。此外，长达十年的净平衡记录以及基岩和表面地形的评估以及冰流测量将作为预测冰层变薄和冰流放缓的空间模式的输入。对这些预报的验证是对理解热带气候-冰冻圈关系的一次严格考验。

This is a renewal of EAR8317722. The project is concerned with tropical glaciers and their reponse to climatic forcing. Drawing on more than a decade's work in various high mountain regions of the tropics, research over the next few years will concentrate on the glaciers of Mount Kenya, and to a lesser extent on the ice masses of Peru's Cordillera Blanca. A major task to be accomplished by 1990 is the mapping of all of Mount Kenya's glaciers at scale l:5,000. In conjunction with a 1963 mapping this will document the glacier changes over the past quarter century and serve as control for recent and future measurements of terminus variations. This task entails the establishement of control points through ground surveys during 1987-89, and airborne photogrammetry in 1989-90. The Lewis Glacier shall be re-mapped for the March 1990 datum at scale 1:2,500. The observations of preceipitation, net balance, and ice flow velocity on the Lewis Glacier will continue. These form the basis for the quantitative formulation of forcing-response relationships in terms of the mass and heat budgets. Also, the decade-long net balance record along with the assessments of bedrock and surface topography and ice flow measurements will serve as input for predictions of the spatial pattern of ice thinning and slowdown of the ice flow. Verification of these forecasts represents a stringent test for an understanding of tropical climate-cryosphere relationships.