land surface and atmosphere are a closely coupled and interacting system, involving
large quantities of matter and energy exchange. Soil moisture, as the most
important factor in the effect of land on local thermal states, can further
affect the general circulation system and, consequently, non-local precipitation.
Therefore, the influence of soil moisture on weather/climate is an important
aspect of land–atmosphere research.
reanalysis and model-simulated soil moisture data, Dr. Chujie GAO and Prof.
Haishan CHEN, from Nanjing University of Information Science & Technology,
China, investigated the relationship between soil moisture and
evapotranspiration, as well as that between surface temperature and
evapotranspiration, by correlation analysis, and explored the spatial
distribution and seasonal evolution of land–atmosphere coupling over eastern
China. Their findings are published in Advances
in Atmospheric Sciences.
distribution and seasonal evolution of land–atmosphere coupling strength. The
dotted grid points are statistically significant at the 95% confidence level.
All data have been linearly detrended.
dry and wet climatic conditions are not conducive to strong land–atmosphere
coupling. Soil moisture plays a decisive role in evapotranspiration only under
the conditions of the dry–wet transition regime, which demonstrates strong
coupling. In Southwest China, which is a relatively humid area, soil moisture
is lowest in spring, resulting in strong coupling at that time of year.
However, in the arid/semi-arid regions of North China, the temperature is close
to or even below 0°C during the relatively cold months, meaning there is not
enough energy to evaporate the soil moisture into the atmosphere. As a result,
the strongest coupling exists in summer. We intend to further discuss the
possible climatic effects of spring coupling over Southwest China and summer
coupling over North China in future work,” explains Dr. Chujie GAO.
C. J., H. S.
Chen, S. L. Sun, B. Xu, V. Ongoma, S. G. Zhu, H. D. Ma and X. Li, 2018: Regional features and seasonality of land–atmosphere
coupling over eastern China. Adv. Atmos.
Sci., 35(6), https://doi.org/10.1007/s00376-017-7140-0.