Nav: Home

A land model with groundwater lateral flow, water use, and soil freeze-thaw front dynamics

August 10, 2018

Human water regulation, groundwater lateral flow and the movement of soil frost and thaw fronts affect water and thermal processes, as well as energy and water exchanges between the land surface and atmosphere. Reasonable representation of these processes in land surface models is very important to improving the understanding of terrestrial eco-hydrological processes and land-atmosphere interactions.

Recently, scientists from CAS institute, XIE Zhenghui, ZENG Yujin, Liu Shuang and their co-authors in LASG/Institute of Atmospheric Physics synchronously incorporated the schemes of anthropogenic water regulation, groundwater lateral flow and the movement of soil frost and thaw fronts into a land surface model, which is then named the Land Surface Model for Chinese Academy of Sciences (CAS-LSM). Meanwhile, they devised and implemented the schemes describing model resolution conversion between groundwater flow module and the land surface model to parallelly simulate the large-scale and high-resolution groundwater flow and its impacts.

Simulations using CAS-LSM were conducted for both Heihe River Basin in China and the globe, respectively, to investigate the impacts of anthropogenic water regulation and groundwater lateral flow on land processes and the response of frozen soil to climate change. Compared with observations, CAS-LSM reproduced the distributions of groundwater, evapotranspiration and permafrost reasonably, and well matched the temporal changes in ground temperature, heat fluxes and soil frost and thaw fronts. The results show that water use raised the latent heat flux and reduced the sensible heat flux, net ecosystem exchange and streamflow recharging to an eco-fragile region, and the active layer thickness increased 8.63 mm/year for permafrost in Heihe River Basin. Global groundwater lateral flow significantly modified the equilibrium water table patterns in North Africa, the Arabian Peninsula, central Asia and southern Australia, deepening the water tables by more than 6 m. Results suggested that CAS-LSM is a potential tool for studying land surface processes.
-end-
This research finding has been published in Journal of Advances in Modeling Earth Systems and Journal of Geophysical Research - Atmospheres.

Institute of Atmospheric Physics, Chinese Academy of Sciences

Related Climate Change Articles:

The black forest and climate change
Silver and Douglas firs could replace Norway spruce in the long run due to their greater resistance to droughts.
For some US counties, climate change will be particularly costly
A highly granular assessment of the impacts of climate change on the US economy suggests that each 1°Celsius increase in temperature will cost 1.2 percent of the country's gross domestic product, on average.
Climate change label leads to climate science acceptance
A new Cornell University study finds that labels matter when it comes to acceptance of climate science.
Was that climate change?
A new four-step 'framework' aims to test the contribution of climate change to record-setting extreme weather events.
It's more than just climate change
Accurately modeling climate change and interactive human factors -- including inequality, consumption, and population -- is essential for the effective science-based policies and measures needed to benefit and sustain current and future generations.
Climate change scientists should think more about sex
Climate change can have a different impact on male and female fish, shellfish and other marine animals, with widespread implications for the future of marine life and the production of seafood.
Climate change prompts Alaska fish to change breeding behavior
A new University of Washington study finds that one of Alaska's most abundant freshwater fish species is altering its breeding patterns in response to climate change, which could impact the ecology of northern lakes that already acutely feel the effects of a changing climate.
Uncertainties related to climate engineering limit its use in curbing climate change
Climate engineering refers to the systematic, large-scale modification of the environment using various climate intervention techniques.
Public holds polarized views about climate change and trust in climate scientists
There are gaping divisions in Americans' views across every dimension of the climate debate, including causes and cures for climate change and trust in climate scientists and their research, according to a new Pew Research Center survey.
The psychology behind climate change denial
In a new thesis in psychology, Kirsti Jylhä at Uppsala University has studied the psychology behind climate change denial.

Related Climate Change Reading:

Climate Change: What Everyone Needs to Know®
by Joseph Romm (Author)

The Politically Incorrect Guide to Climate Change (The Politically Incorrect Guides)
by Marc Morano (Author)

A Global Warming Primer: Answering Your Questions About The Science, The Consequences, and The Solutions
by Jeffrey Bennett (Author)

The Sixth Extinction: An Unnatural History
by Elizabeth Kolbert (Author)

Climate Change: The Facts
by J.Abbot (Author), J.S. Armstrong (Author), A.Bolt (Author), R.Carter (Author), R.Darwall (Author), J.Delingpole (Author), C.Essex (Author), S.Franks (Author), K.Green (Author), D.Laframboise (Author), N.Lawson (Author), B.Lewin (Author), R.Lindzen (Author), J.Marohasy (Author), R.McKitrick (Author), P.Michaels (Author), A.Moran (Author), J.Nova (Author), G.Paltridge (Author), I.Plimer (Author), W.Soon (Author), M.Steyn (Author), A.Watts (Author), Alan Moran (Editor)

This Changes Everything: Capitalism vs. The Climate
by Naomi Klein (Author)

Climate Change: The Facts 2017
by Jennifer Marohasy (Editor)

Drawdown: The Most Comprehensive Plan Ever Proposed to Reverse Global Warming
by Paul Hawken (Editor), Tom Steyer (Editor)

Dire Predictions, 2nd Edition: Understanding Climate Change
by Michael E. Mann (Author), Lee R. Kump (Author)

The Thinking Person's Guide to Climate Change
by Robert Henson (Author)

Best Science Podcasts 2018

We have hand picked the best science podcasts for 2018. Sit back and enjoy new science podcasts updated daily from your favorite science news services and scientists.
Now Playing: TED Radio Hour

The Right To Speak
Should all speech, even the most offensive, be allowed on college campuses? And is hearing from those we deeply disagree with ... worth it? This hour, TED speakers explore the debate over free speech. Guests include recent college graduate Zachary Wood, political scientist Jeffrey Howard, novelist Elif Shafak, and journalist and author James Kirchick.
Now Playing: Science for the People

#486 Volcanoes
This week we're talking volcanoes. Because there are few things that fascinate us more than the amazing, unstoppable power of an erupting volcano. First, Jessica Johnson takes us through the latest activity from the Kilauea volcano in Hawaii to help us understand what's happening with this headline-grabbing volcano. And Janine Krippner joins us to highlight some of the lesser-known volcanoes that can be found in the USA, the different kinds of eruptions we might one day see at them, and how damaging they have the potential to be. Related links: Kilauea status report at USGS A beginner's guide to Hawaii's otherworldly...