Urbansignatures inthespatial clusteringof summer heavy rainfall events over the Beijing metropolitan region

Long Yang, Fuqiang Tian, James A. Smith, Heping Hu

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

The climatology of summer heavy rainfall events over the Beijing metropolitan region during 2008–2012 is investigated with the aid of an observational network of rain gauges and the Weather Research and Forecasting model. Two “hot spots” of higher frequency of summer heavy rainfall events are observed. One is located over the urban core region and the other resides in the climatological downwind region. Two comparative sets of model runs are designed to assess the effect of land surface properties with and without the presence of the city on the model simulation results. By comparing the two sets of model runs, the changes of rainfall statistics, behaviors of storm cells, and variables related to convection due to urbanization are analyzed and quantified. The intensity of heavy rainfall is increased over the urban and downwind region, corresponding to the locations of the two observed hot spots based on rain gauges. The changes of rainfall statistics suggest that the probability distribution of rainfall is shifted toward a heavier upper tail distribution. The Lagrangian properties of storm cells are examined using a newly developed Storm-Cell Identification procedure. High-echo storm cells tend to split approaching the city and merge in the downwind region. The level of free convection and the height of the planetary boundary layer are significantly increased over the urban region and maximum convective available potential energy is decreased. Increased sensible heat flux from the urban surfaces plays a dominant role in the modification of simulated rainfall from a climatological perspective.

Original languageEnglish (US)
Pages (from-to)1203-1217
Number of pages15
JournalJournal of Geophysical Research
Volume119
Issue number3
DOIs
StatePublished - Feb 16 2014

Fingerprint

summer
Rain
rain gages
rain
rainfall
China
cells
rain gauges
Rain gages
statistics
planetary boundary layer
climatology
gauge
weather
free convection
forecasting
surface properties
convection
heat flux
echoes

All Science Journal Classification (ASJC) codes

  • Forestry
  • Aquatic Science
  • Soil Science
  • Water Science and Technology
  • Earth-Surface Processes
  • Geochemistry and Petrology
  • Geophysics
  • Oceanography
  • Palaeontology
  • Ecology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Atmospheric Science

Cite this

@article{821242a1bb9e44c4be124e7877702212,
title = "Urbansignatures inthespatial clusteringof summer heavy rainfall events over the Beijing metropolitan region",
abstract = "The climatology of summer heavy rainfall events over the Beijing metropolitan region during 2008–2012 is investigated with the aid of an observational network of rain gauges and the Weather Research and Forecasting model. Two “hot spots” of higher frequency of summer heavy rainfall events are observed. One is located over the urban core region and the other resides in the climatological downwind region. Two comparative sets of model runs are designed to assess the effect of land surface properties with and without the presence of the city on the model simulation results. By comparing the two sets of model runs, the changes of rainfall statistics, behaviors of storm cells, and variables related to convection due to urbanization are analyzed and quantified. The intensity of heavy rainfall is increased over the urban and downwind region, corresponding to the locations of the two observed hot spots based on rain gauges. The changes of rainfall statistics suggest that the probability distribution of rainfall is shifted toward a heavier upper tail distribution. The Lagrangian properties of storm cells are examined using a newly developed Storm-Cell Identification procedure. High-echo storm cells tend to split approaching the city and merge in the downwind region. The level of free convection and the height of the planetary boundary layer are significantly increased over the urban region and maximum convective available potential energy is decreased. Increased sensible heat flux from the urban surfaces plays a dominant role in the modification of simulated rainfall from a climatological perspective.",
author = "Long Yang and Fuqiang Tian and Smith, {James A.} and Heping Hu",
year = "2014",
month = "2",
day = "16",
doi = "https://doi.org/10.1002/2013JD020762",
language = "English (US)",
volume = "119",
pages = "1203--1217",
journal = "Journal of Geophysical Research: Solid Earth",
issn = "2169-9313",
publisher = "Wiley-Blackwell",
number = "3",

}

Urbansignatures inthespatial clusteringof summer heavy rainfall events over the Beijing metropolitan region. / Yang, Long; Tian, Fuqiang; Smith, James A.; Hu, Heping.

In: Journal of Geophysical Research, Vol. 119, No. 3, 16.02.2014, p. 1203-1217.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Urbansignatures inthespatial clusteringof summer heavy rainfall events over the Beijing metropolitan region

AU - Yang, Long

AU - Tian, Fuqiang

AU - Smith, James A.

AU - Hu, Heping

PY - 2014/2/16

Y1 - 2014/2/16

N2 - The climatology of summer heavy rainfall events over the Beijing metropolitan region during 2008–2012 is investigated with the aid of an observational network of rain gauges and the Weather Research and Forecasting model. Two “hot spots” of higher frequency of summer heavy rainfall events are observed. One is located over the urban core region and the other resides in the climatological downwind region. Two comparative sets of model runs are designed to assess the effect of land surface properties with and without the presence of the city on the model simulation results. By comparing the two sets of model runs, the changes of rainfall statistics, behaviors of storm cells, and variables related to convection due to urbanization are analyzed and quantified. The intensity of heavy rainfall is increased over the urban and downwind region, corresponding to the locations of the two observed hot spots based on rain gauges. The changes of rainfall statistics suggest that the probability distribution of rainfall is shifted toward a heavier upper tail distribution. The Lagrangian properties of storm cells are examined using a newly developed Storm-Cell Identification procedure. High-echo storm cells tend to split approaching the city and merge in the downwind region. The level of free convection and the height of the planetary boundary layer are significantly increased over the urban region and maximum convective available potential energy is decreased. Increased sensible heat flux from the urban surfaces plays a dominant role in the modification of simulated rainfall from a climatological perspective.

AB - The climatology of summer heavy rainfall events over the Beijing metropolitan region during 2008–2012 is investigated with the aid of an observational network of rain gauges and the Weather Research and Forecasting model. Two “hot spots” of higher frequency of summer heavy rainfall events are observed. One is located over the urban core region and the other resides in the climatological downwind region. Two comparative sets of model runs are designed to assess the effect of land surface properties with and without the presence of the city on the model simulation results. By comparing the two sets of model runs, the changes of rainfall statistics, behaviors of storm cells, and variables related to convection due to urbanization are analyzed and quantified. The intensity of heavy rainfall is increased over the urban and downwind region, corresponding to the locations of the two observed hot spots based on rain gauges. The changes of rainfall statistics suggest that the probability distribution of rainfall is shifted toward a heavier upper tail distribution. The Lagrangian properties of storm cells are examined using a newly developed Storm-Cell Identification procedure. High-echo storm cells tend to split approaching the city and merge in the downwind region. The level of free convection and the height of the planetary boundary layer are significantly increased over the urban region and maximum convective available potential energy is decreased. Increased sensible heat flux from the urban surfaces plays a dominant role in the modification of simulated rainfall from a climatological perspective.

UR - http://www.scopus.com/inward/record.url?scp=84899013247&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84899013247&partnerID=8YFLogxK

U2 - https://doi.org/10.1002/2013JD020762

DO - https://doi.org/10.1002/2013JD020762

M3 - Article

VL - 119

SP - 1203

EP - 1217

JO - Journal of Geophysical Research: Solid Earth

JF - Journal of Geophysical Research: Solid Earth

SN - 2169-9313

IS - 3

ER -