Inter-Annual Variability of the Hydrologic Cycle over North America

北美水文循环的年际变化

• 批准号: 0208009
• 负责人: Praveen Kumar
• 金额: $ 25.2万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-08-01 至 2005-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0208009&HistoricalAwards=false
• 关键词: Inter; Annual; Variability; Hydrologic; Cycle

0208009KumarThe goal of the proposed research is to develop a better understanding of the coupling between the atmospheric and terrestrial (land) branches of the hydrologic cycle and identifies the physical basis of their inter-annual variability. The underlying hypothesis of the proposed research is that the regional atmospheric moisture transport is governed by both the large scale forcing as well as local recycling, and their relative contributions have important implications in the inter-annual variability of the hydrologic cycle. The relative contributions of advected and recycled moisture may depend on the season, re-ion and the memory of the various reservoirs such as the atmosphere. near-surface and sub-surface storage. Two specific science objectives will be addressed in this project:Objective I: Identify the modes of the observed inter-annual variability of the hydrologic cycle and the underlying causal mechanism.Objective 2: Identify the roles of land surface and sub-surface storage (water and snow/ice) in regulating the inter-annual variability of the hydrologic cycle.Climate variability, natural or human induced. Have the potential to alter the moisture fluxes, which can have significant societal impact. For example, it is speculated that C02-induced global warming would lead to an intensification of global water cycle (an increase in global water fluxes), leading to greater -global precipitation. faster evaporation and a general exacerbation of extreme weather and hydrological regimes including floods and droughts. In addition we may see a shift in the spatial patterns of transport, resulting from the feedback between the changes in the hydrologic cycle and general circulation patterns. Changes in hydrologic regimes have implications for water resource management as well as biogeochemical processes in ecosystems. A better understanding of the dynamics of the hydrologic cycle and the underlying causal mechanism will have significant impact in all areas of water-related processes.

0208009Kumar拟议的研究的目标是更好地理解水文周期的大气和陆地（陆地）分支之间的耦合，并确定其年度差异的物理基础。 拟议的研究的基本假设是，区域大气水分的运输受大规模强迫和局部回收的控制，它们的相对贡献对水文循环的年度变异性具有重要意义。 前流和回收水分的相对贡献可能取决于季节，再离子以及各种水库（例如大气）的记忆。近表面和次面存储。 该项目将解决两个具体的科学目标：目标I：确定观察到的水文循环的年际变异性和基本因果机制的模式。目标2：确定地表和地下储存的作用（水）和雪/冰）在调节水文周期的年度变异性方面。气候变异性，自然或人类。有可能改变水分通量，这可能会产生重大的社会影响。 例如，据推测，C02诱导的全球变暖将导致全球水周期的加剧（全球水通量增加），从而导致全球降水量更大。更快的蒸发和极端天气和水文制度（包括洪水和干旱）的普遍加剧。 此外，由于水文循环的变化与一般循环模式之间的反馈，我们可能会看到传输空间模式的变化。 水文制度的变化对生态系统中的水资源管理以及生物地球化学过程有影响。 更好地了解水文循环的动力学和潜在的因果机制将在与水相关过程的所有领域都产生重大影响。