Open AccessWarming and drying climate over Loess plateau area in China and its effect on land surface energy exchange
Author(s) -
Qiang Zhang,
Jing Huang,
Liang Zhang,
Liyang Zhang
Publication year - 2013
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.62.139202
Subject(s) - sensible heat , environmental science , latent heat , atmospheric sciences , precipitation , radiation flux , flux (metallurgy) , climate model , plateau (mathematics) , climatology , climate change , bowen ratio , heat flux , heat transfer , radiation , geology , meteorology , materials science , geography , mathematical analysis , oceanography , physics , mathematics , quantum mechanics , metallurgy , thermodynamics
China's Loess plateau, as one of the areas in the world, is vulnerable to ecological environment and sensitive to climate change. The characteristic of land surface process has been changing in this area, and it affects the formation and evolution of regional weather and climate. However, limited by observational land surface data, exchange process variation of the surface energy of the Loess plateau and its mechanism of response to climate change is limited. In this study, we combine the observed experimental data with the land surface model simulated data, test the previous four land surface models. It shows the CLM is reliable in Loess plateau. Then we use the observed data and model simulated data to analyze the variation of regional climate and the characteristics of land surface energy exchange, and discuss the effect of climate change on land surface energy exchange. It shows that Loess plateau is warming and drying in recent decades. It induces the increase in solar radiation, surface reflected radiation and surface longwave upward radiation. This makes the net radiation decrease. Correspondingly, surface latent heat flux, sensible heat flux and soil heat flux all have a decreasing trend. But the distribution ratio of components of surface heat flux is basically unchanged. In addition, the annual variation of sensible heat flux is controlled by solar radiation, and latent heat flux is controlled by solar radiation and precipitation. The annual variation of each component of surface heat flux is sensitive to precipitation, not sensitive to temperature. The climate acidification affected surface energy balance farmore than temperature rise.