ORIGINAL RESEARCH
Effects of Soil Moisture on Surface Radiation
Balance and Water-Heat Flux in Desert Steppe
Environment of Inner Mongolia
| 1 | College of Geographical Science, Inner Mongolia Normal University, Hohhot 010022, Inner Mongolia, China |
| 2 | The Institute of Water Resources for Pastoral Areas, Hohhot 010020, Inner Mongolia, China |
| 3 | College of Desert Control Science and Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China |
| 4 | Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China |
CORRESPONDING AUTHOR
Submission date: 2020-03-15
Final revision date: 2020-08-28
Acceptance date: 2020-08-30
Online publication date: 2020-12-11
Publication date: 2021-02-05
Pol. J. Environ. Stud. 2021;30(2):1881–1891
KEYWORDS
TOPICS
ABSTRACT
The response of surface radiation and water-heat flux to soil moisture is a critical mechanism in
drought, desertification and other effects of climate change. This study analyzed soil moisture data
and four-component radiation data during the summers (June, July and August) from 2010 to 2018 in
a desert steppe environment of Inner Mongolia. The influence of soil moisture on the radiation flux
and water-heat flux under dry, intermediate and wet conditions were quantified through correlation
analysis. Radiation and water-heat fluxes showed obvious diurnal changes under different soil moisture
conditions. Net longwave radiation and soil heat flux showed the largest differences in diurnal variation
followed by net surface radiation, total flux and albedo. Net radiation, net longwave radiation, surface
received longwave radiation, soil heat flux and total flux all increased with increasing soil moisture,
while surface reflection ability decreased. Soil moisture during wet intervals (16.57-28%) showed
a stronger correlation with fluxes than dry and intermediate intervals (9.78-16.46%). This indicates that
soil moisture exerts a stronger influence on surface flux under moist conditions. Soil moisture showed
a negative correlation with surface reflecting longwave radiation (P<0.01) and a positive correlation
with net longwave radiation, net surface radiation and total flux (P<0.01). The research shows that soil
moisture interacts with the atmospheric system through its influence on total flux (sensible heat and
latent heat) and surface net radiation.
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