TY - JOUR
T1 - A new perspective of urban-rural differences
T2 - The impact of soil water advection
AU - Wang, Zhihua
N1 - Funding Information:
This work is supported by the National Science Foundation (NSF) under grant No. CBET-1435881 . I would also like to thank the Central Arizona-Phoenix Long-Term Ecological Research (CAP LTER) project under NSF grant CAP3: BCS-1026865 , for partial financial support and sharing of field measurements in Phoenix. The following personnel are acknowledged for sharing their field measurement datasets: Professor Elie Bou-Zeid, Professor James Smith, and Dr. Mary-Lynn Baeck for sharing the experimental datasets at Princeton University, and Dr. Ting Sun for sharing datasets of Tsinghua green roof.
Publisher Copyright:
© 2014 Elsevier B.V.
PY - 2014
Y1 - 2014
N2 - Urban-rural contrast is central to many urban environmental problems, a prominent example being the urban heat island effect. To ameliorate urban thermal stress, extensive research work has been focused on the mitigation of critical environmental temperatures, while the timing of excessive heating was largely overlooked. Advection of soil water flux plays a critical role in determining the soil thermal field, which in turn modulates surface energy fluxes and land-atmosphere interactions. In this paper, we formulate the wave phase differences between soil temperatures and soil heat fluxes due to soil water advection based on harmonic function method. It has been found that phase lags, viz. hysteresis effects, exist among all land surface energy budgets and the land surface temperature. More generally, the difference of phase and time evolution of the land surface temperature and the ground heat flux is also manifested in annual cycles. In the context of urban-rural differences, the temporal difference in peak surface temperatures and peak turbulent fluxes has profound implication to human thermal comfort and building energy efficiency.
AB - Urban-rural contrast is central to many urban environmental problems, a prominent example being the urban heat island effect. To ameliorate urban thermal stress, extensive research work has been focused on the mitigation of critical environmental temperatures, while the timing of excessive heating was largely overlooked. Advection of soil water flux plays a critical role in determining the soil thermal field, which in turn modulates surface energy fluxes and land-atmosphere interactions. In this paper, we formulate the wave phase differences between soil temperatures and soil heat fluxes due to soil water advection based on harmonic function method. It has been found that phase lags, viz. hysteresis effects, exist among all land surface energy budgets and the land surface temperature. More generally, the difference of phase and time evolution of the land surface temperature and the ground heat flux is also manifested in annual cycles. In the context of urban-rural differences, the temporal difference in peak surface temperatures and peak turbulent fluxes has profound implication to human thermal comfort and building energy efficiency.
KW - Advection-diffusion
KW - Land surface temperature
KW - Phase lag
KW - Soil water flux
KW - Surface energy balance
KW - Urban heat island
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U2 - 10.1016/j.uclim.2014.08.004
DO - 10.1016/j.uclim.2014.08.004
M3 - Article
AN - SCOPUS:84927961273
SN - 2212-0955
VL - 10
SP - 19
EP - 34
JO - Urban Climate
JF - Urban Climate
IS - P1
ER -