Zipper Samuel C, Jaramillo Fernando, Wang-Erlandsson Lan, Cornell Sarah E, Gleeson Tom, Porkka Miina, Häyhä Tiina, Crépin Anne-Sophie, Fetzer Ingo, Gerten Dieter, Hoff Holger, Matthews Nathanial, Ricaurte-Villota Constanza, Kummu Matti, Wada Yoshihide, Gordon Line
Kansas Geological Survey University of Kansas Lawrence KS USA.
Department of Civil Engineering University of Victoria Victoria British Columbia Canada.
Earths Future. 2020 Feb;8(2):e2019EF001377. doi: 10.1029/2019EF001377. Epub 2020 Feb 13.
The planetary boundaries framework defines the "safe operating space for humanity" represented by nine global processes that can destabilize the Earth System if perturbed. The water planetary boundary attempts to provide a global limit to anthropogenic water cycle modifications, but it has been challenging to translate and apply it to the regional and local scales at which water problems and management typically occur. We develop a cross-scale approach by which the water planetary boundary could guide sustainable water management and governance at subglobal contexts defined by physical features (e.g., watershed or aquifer), political borders (e.g., city, nation, or group of nations), or commercial entities (e.g., corporation, trade group, or financial institution). The application of the water planetary boundary at these subglobal contexts occurs via two approaches: (i) calculating , in which local water cycle modifications are compared to that context's allocation of the global safe operating space, taking into account biophysical, socioeconomic, and ethical considerations; and (ii) defining a in which interactions between water stores and Earth System components are used to define local boundaries required for sustaining the local water system in stable conditions, which we demonstrate with a case study of the Cienaga Grande de Santa Marta wetlands in Colombia. By harmonizing these two approaches, the water planetary boundary can ensure that water cycle modifications remain within both local and global boundaries and complement existing water management and governance approaches.
行星边界框架定义了“人类安全运行空间”，该空间由九个全球过程代表，如果这些过程受到干扰，可能会破坏地球系统的稳定。水行星边界试图为人类活动对水循环的改变设定一个全球限度，但要将其转化并应用到通常出现水问题及水管理的区域和地方尺度上却颇具挑战。我们开发了一种跨尺度方法，通过该方法，水行星边界能够在由自然特征（如流域或含水层）、政治边界（如城市、国家或国家集团）或商业实体（如公司、贸易集团或金融机构）所界定的次全球背景下，指导可持续的水资源管理与治理。水行星边界在这些次全球背景下的应用通过两种方法实现：（i）进行计算，即将当地水循环的改变与该背景下全球安全运行空间的分配情况进行比较，同时考虑生物物理、社会经济和伦理因素；（ii）定义一个范围，即利用水储量与地球系统各组成部分之间的相互作用来确定在稳定条件下维持当地水系统所需的当地边界，我们以哥伦比亚圣玛尔塔大沼泽湿地的案例研究对此进行了说明。通过协调这两种方法，水行星边界能够确保水循环的改变保持在当地和全球边界之内，并补充现有的水资源管理与治理方法。
