A new perspective of urban-rural differences: The impact of soil water advection

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
Pages (from-to)19-34
Number of pages16
JournalUrban Climate
Volume10
Issue numberP1
DOIs
StatePublished - 2014

Fingerprint

land surface
advection
surface temperature
soil water
surface energy
heat
water
heat flux
energy
heat island
research work
energy budget
energy flux
hysteresis
energy efficiency
annual cycle
soil temperature
mitigation
soil
heat pump

Keywords

  • Advection-diffusion
  • Land surface temperature
  • Phase lag
  • Soil water flux
  • Surface energy balance
  • Urban heat island

ASJC Scopus subject areas

  • Atmospheric Science
  • Environmental Science (miscellaneous)
  • Geography, Planning and Development
  • Urban Studies

Cite this

A new perspective of urban-rural differences : The impact of soil water advection. / Wang, Zhihua.

In: Urban Climate, Vol. 10, No. P1, 2014, p. 19-34.

Research output: Contribution to journalArticle

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