资源环境科技发展态势分析平台

This study explores the impacts of groundwater processes on the simulated land‐surface water balance and hydrometeorology. Observations are compared to multi‐scale Weather Research and Forecasting (WRF) simulations of summer seasons for three years: 2012, 2013, and 2014. Results show that a grid‐spacing of 3 km or smaller is necessary to capture small‐scale river and stream networks and associated shallow water tables, and supply root‐zone water double that of simulations with 9‐km and 27‐km grid spacing, which is critical to replenishing the depleted vegetation root zones and leads to 150 mm more evapotranspiration. Including groundwater processes in convection‐permitting models is effective to reduce: 1) 2‐m temperature warm biases from 5‐6^oC to 2‐3^oC, and 2) the low precipitation bias by half. The additional groundwater supply to active soil flux in convection‐permitting simulations with groundwater for June‐August is nearly translated into the same amount of increased precipitation in the domain investigated.

This article is protected by copyright. All rights reserved.