Inter-Annual Variability of the Hydrologic Cycle over North America

拟议研究的目标是更好地了解水文循环的大气和陆地(陆地)分支之间的耦合，并确定其年际变化的物理基础。这项研究的基本假设是，区域大气水汽输送既受大尺度强迫又受局地再循环的支配，它们的相对贡献对水文循环的年际变化具有重要意义。平流和再循环水分的相对贡献可能取决于季节、再离子和各种水库(如大气)的记忆。近地表和地下储存。本项目将涉及两个具体的科学目标：目标一：确定观测到的水文循环年际变化的模式和潜在的原因机制。目标2：确定地表和次表层储存(水和雪/冰)在调节水文循环年际变化方面的作用。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，二氧化碳引起的全球变暖将导致全球水循环的加剧(全球水通量增加)，导致全球降水量增加。蒸发加快，极端天气和包括洪水和干旱在内的水文状况普遍恶化。此外，我们可能会看到，由于水文循环和一般环流模式的变化之间的反馈，运输的空间模式发生了变化。水文状况的变化对水资源管理以及生态系统中的生物地球化学过程都有影响。更好地了解水文循环的动态和根本的成因机制将对与水有关的进程的所有领域产生重大影响。

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.