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.

0309678 Wahr GRACE卫星使命提供的地球全球重力场的月度解，将被用来估计和解释垂直方向上的月变化-GRACE提供的重力场球谐系数将用于估计地球表面大陆区域平均质量的变化，这将涉及到构造这些变化将被解释为这些地区储存的水量的变化。这些变化将被估计和解释的事情包括：大区域内储存的水总量的变化（大于200，000平方公里）;大河流域平均降水量减去蒸发量;北方纬度积雪的变化;以及大型地下蓄水层地区总蓄水量的变化。这项工作将成为一名研究生的博士论文项目，将是整合时间的第一步这些观测结果构成了水文学的一种新的创新数据类型，在改善对全球水循环的了解方面大有希望。