Ground subsidence effects on simulating dynamic high-latitude surface inundation under permafrost thaw using CLM5
Publisher DOI
Abstract
Simulating surface inundation is particularly challenging for the high-latitude permafrost regions. Ice-rich permafrost thaw can create expanding thermokarst lakes as well as shrinking large wetlands. Such processes can have major biogeochemical implications and feedbacks to the climate system by altering the pathways and rates of permafrost carbon release. However, the processes associated with it havenot yet been properly represented in Earth system models. We show a new model parameterization that allows direct representation of surface water dynamics in CLM (Community Land Model), the land surface model of several Earth System Models. Specifically, we coupled permafrost-thaw-induced ground subsidence and surface microtopography distribution to represent surface water dynamics in the high latitudes. Our results show increased surface water fractions around western Siberian plains and northeastern territories of Canada. Additionally, localized drainage events correspond well to severe ground subsidence events. Our parameterization is one of the first steps towards a process-oriented repre-sentation of surface hydrology, which is crucial to assess the biogeochemical feedbacks between land and the atmosphere under changing climate
Date Issued
2019
Publication Type
Article
Subject(s)
Language(s)
en
Author(s)
Lee, Hanna | |
Lawrence, David M. | |
Swenson, Sean C. | |
Prigent, Catherine |
Additional Credits
Journal
Geoscientific model development (GMD)
Publisher
Copernicus Publications
ISSN
1991-959X
Access(Rights)
open.access