Water Balance Estimates From Time-Variable Satellite Gravity

根据时变卫星重力估算水平衡

• 批准号: 0309678
• 负责人: John Wahr
• 金额: $ 16.48万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-09-01 至 2006-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0309678&HistoricalAwards=false
• 关键词: Water; Balance; Estimates; Time; Variable

0309678WahrMonthly solutions for the Earth's global gravity field,as provided bythe GRACE satellite mission, will be used to estimate and interpretmonth-to-month changes in the vertically-integrated distribution ofliquid water and snow stored on land.The spherical harmonic coefficients of the gravityfield provided by GRACE will beused to estimate mass variations averaged over continental regionson the Earth's surface.This will involve the construction ofaveraging functions that are specially tailoredfor those regions.These variations will be interpreted interms of changes in the mass of water stored in those regions.Among the things that will be estimated and interpreted are:changes in the total amount of water stored within large regions (greaterthan 200,000 square km);precipitation minus evaporation averagedover large river basins;changes in snowpack at northern latitudes; andchanges in the total water stored in regions withlarge underground aquifers.This work, which will form the PhD thesisproject of a graduate student,will be a first step towards integrating time-variablesatellite gravity observations into the hydrological sciences.These observations constitute a new and innovative data type for hydrology,with considerable promise for improved understandingof the global water cycle.

格雷斯卫星任务提供的0309678 WAHRMONTHLELLETHLYSLESS解决方案将用于估算和解释性的变化，在垂直综合的水和雪上存储在土地上的垂直综合分布和降雪的变化。专门针对这些区域专门定制的实践功能的构建。这些变化将被解释为这些区域中存储的水质量变化的交织。在将要估计和解释的事物是：大型区域内存储的水总量的变化（较大的200,000平方km）（降水量km）；降水量减少了较大的河流底层；在持有地下含水层的地区存储的总水中，这项工作将构成研究生的博士学位论文，将是将时间变化的重力观察到整合到水文科学中的第一步，这些观察值构成了新的和创新的数据类型，以构成了一种新的，并构成了一个新的知识。