Observational evidence of summer precipitation deficit-temperature coupling in China，已在JGR发表，现请各位朋友、专家批评指正。

Online version of JGR paper.pdf

摘要：

Partition of the energy between sensible heat and latent heat indicates that surface temperatures
are affected by soil moisture deficits. Since transpiration by plants is the largest contributor to the land’s
total latent heat, the coupling of temperature and soil moisture will depend on the response of vegetation to
soil moisture deficit and those are influenced by the soil moisture regimes. Utilizing daily precipitation and
temperature data from China for a period of 1961–2010, this study computes average annual climatic water
balance (AACWB) for defining soil moisture regimes and then quantitatively investigates the summer soil
moisture-temperature coupling. With precipitation deficits (indicated by standardized precipitation index
with the selected optimal timescale of 3months) as proxy of soil moisture deficits, results indicate that the
relationship between summer precipitation deficits and hot extremes tends to be enhanced when the
negative AACWB draws closer toward zero while tends to be weakened with the increase of positive AACWB.
For the region with the negative AACWB closing zero, the enhanced relationship should be attributed to the
increase of the proportion of latent heat compared to the absorbed total energy. However, the weakened
relationship with the increase of positive AACWB may be owing to the different responses of vegetation to
precipitation deficit that the transpiration in the region with lower positive AACWB is less when responding to precipitation deficit. However, the physiological mechanisms behind vegetation response to soil moisture
deficits still need to be further analyzed. By quantifying relevant biological and hydrological processes and
their interaction, it is expected that the uncertainties in future climate scenarios be reduced, which would then
allow the development of early warning and adaptation measures prior to the occurrence of hot extremes.
Further, the summer precipitation deficit-temperature coupling is strongest along the strip stretching from
southwest to northeast in China.