Article
Environmental Sciences
Ganghan Kim, Joonlee Lee, Myong-In Lee, Dongmin Kim
Summary: This study uses model experiments to examine the impacts of urbanization on the local atmospheric circulation and the dispersion of air pollutants in the city of Ulsan, South Korea. Results show that urbanization enhances surface heat flux, leading to temperature anomalies and changes in low-level wind patterns in urban areas, affecting the dispersion of aerosols through thermodynamical effects.
ATMOSPHERIC ENVIRONMENT
(2021)
Article
Meteorology & Atmospheric Sciences
Jiajian He, Daiya Chen, Yuqian Gu, Hongwei Jia, Ke Zhong, Yanming Kang
Summary: The applicability of the planetary boundary layer (PBL) scheme in the WRF model varies in different regions. The choice of the WRF PBL scheme is crucial when simulating a sea-land breeze (SLB) process. The study found that only the YSU and SH schemes are suitable for simulating SLB in Shanghai, as they provide accurate results and can simulate the coupled structure of sea-land circulation and heat island circulation.
ATMOSPHERIC RESEARCH
(2022)
Article
Environmental Sciences
Ao Wang, Xian-Xiang Li, Rui Xin, Lup Wai Chew, Ferdinando Salata
Summary: Anthropogenic heat emissions have significant impacts on urban climate. This study investigates the relative contribution of individual components of anthropogenic heat in Singapore, using high-resolution data. The study finds that the effects of buildings and traffic on local temperatures may exceed the temperature increase caused by total anthropogenic heat.
Article
Environmental Sciences
Annette L. Hirsch, Jason P. Evans, Christopher Thomas, Brooke Conroy, Melissa A. Hart, Mathew Lipson, William Ertler
Summary: Heatwaves have implications for human health and ecosystem function, particularly in urban areas where temperatures may be higher due to the urban heat island effect. In coastal cities like Sydney, sea breezes can provide relief, but topographic features and urban heat can offset this cooling influence. Convection-permitting simulations show that the interaction between sea breezes and urban heat can significantly impact temperature gradients and heat dispersion in the city.
ENVIRONMENTAL RESEARCH LETTERS
(2021)
Review
Environmental Sciences
Dun Zhu, Ryozo Ooka
Summary: This study reviewed the literature on scenario experiments that focused on the impact of urbanization on urban heat islands. Based on existing research, urbanization is divided into five features: land use and land cover, urban morphology, canopy surface, anthropogenic heat release, and response to global warming. The study evaluated the type of urban canopy model, land use data, and input methods used in the experiments for these five scenarios, analyzed UHI-related indicators, and assessed the real-world scenarios and variables involved in each urbanization feature. The aim of this study was to assist researchers in selecting appropriate modeling methods and UHI-related indicators based on the urbanization features of their focus.
Article
Meteorology & Atmospheric Sciences
Jie Wang, Shiguang Miao, Quang-Van Doan, Fei Chen, Ronnie Abolafia-Rosenzweig, Long Yang, Guwei Zhang, Yizhou Zhang, Jingjing Dou, Youpeng Xu
Summary: Detailed urban information, such as LULC, AH, and UCP, significantly influence meteorological field simulations, particularly when using the WRF model coupled with the SLUCM. This study develops high-resolution datasets for Nanjing, China, and conducts numerical experiments to evaluate the impacts of urban parameters on the thermal environment. Results show that LULC change affects various factors, including temperature, wind speed, and heat flux, leading to urban warming. UCP and AH also contribute to the increase in temperature and other thermal effects.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Environmental Sciences
Rui Silva, Ana Cristina Carvalho, Susana Cardoso Pereira, David Carvalho, Alfredo Rocha
Summary: Urban heat islands are a potential hazard for urban populations, especially during heatwaves. Lisbon, a medium-size city, is frequently affected by high-temperature heatwaves. This study evaluates the urban heat island effect in Lisbon under future climate scenarios, finding that irrigation can mitigate the anthropogenic heat.
Article
Environmental Sciences
Rui Silva, Ana Cristina Carvalho, Susana Cardoso Pereira, David Carvalho, Alfredo Rocha
Summary: This study evaluates the changes of urban heat island (UHI) within Lisbon and finds that the urban heat island intensity (UHII) is expected to increase in the future century, mainly due to the introduction of urban land use land cover (LULC) with reduced green fraction during city consolidation.
Article
Environmental Sciences
Ronald Gil Joy P. Bilang, Ariel C. Blanco, Justine Ace S. Santos, Lyndon Mark P. Olaguera
Summary: This study aims to simulate 2 m air temperature and relative humidity in Metro Manila using the WRF model and UCMs. While the simulation of air temperature is accurate, there are challenges in simulating relative humidity, with the use of actual urban morphology values improving accuracy.
Article
Environmental Sciences
Ju Li, Yubing Pan, Qingchun Li, Donald H. Lenschow, Mingyu Zhou, Xian Xiao, Yaoting Wang, Zhigang Cheng
Summary: Several simulation studies have shown that sea-breeze fronts (SBFs) can penetrate far inland through the Beijing-Tianjin-Hebei urban agglomeration (BTH) from the Bohai Bay coast. However, there is limited observational evidence to support this claim. Through dense surface observation networks, we observed a SBF that penetrated 170 km inland from Bohai Bay and interacted with cities in the BTH. The SBF was slower in urban areas, causing a bending of the front line, and resulted in a temporary increase in surface air temperature in both urban and rural areas.
Article
Environmental Sciences
Rundong Feng, Fuyuan Wang, Kaiyong Wang, Hongjie Wang, Li Li
Summary: The study reveals a clear spatiotemporal coupling between urban ecological land (UEL) and the urban heat island effect in the Guangdong-Hong Kong-Macao Greater Bay Area. The evolution of UEL landscape structure is related to the mitigation of the heat island effect, with UEL patches dominance and richness explaining a significant portion of the effect. The implementation of ecological restoration projects has led to a shift towards the dominance of UEL and natural-anthropogenic factors in reducing the urban heat island effect.
ENVIRONMENT INTERNATIONAL
(2021)
Article
Environmental Studies
Paolo Semenzato, Lucia Bortolini
Summary: The urban heat island effect has adverse impacts on human health and the environment as well. The use of vegetation, particularly urban tree planting, is considered as a potential strategy to mitigate the heat island effect. By using the i-Tree Cool Air model, the variations and spatial distribution of air temperature in the city of Padova, Italy were analyzed, showing lower air temperatures in areas with tree canopy. However, further research is necessary to determine the reliability of temperature predictions.
Article
Meteorology & Atmospheric Sciences
Ana Torres-Vazquez, Jonathan Pleim, Robert Gilliam, George Pouliot
Summary: The Long Island Sound Tropospheric Ozone Study aimed to improve the understanding of ozone chemistry and transport from New York City to the Long Island Sound and Connecticut coastline. The study found that using higher model resolutions can enhance the simulation of sea breeze circulations, low-level jets, and boundary layer evolution, resulting in improved surface meteorology statistics and more accurate ozone predictions.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2022)
Article
Meteorology & Atmospheric Sciences
Fitria Puspita Sari, Iris Manola, Aristofanis Tsiringakis, Gert Jan Steeneveld
Summary: Between 2014 and 2017, there were five hail events reported in Surabaya, Indonesia. The rapid urbanization in the city may have contributed to the increased heat release and deepening of convective storms, resulting in hail events. A simulation study showed that urbanization and higher sea surface temperatures contributed to the enhancement of storms in Surabaya, leading to increased precipitation.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Environmental Sciences
Linying Wang, Ting Sun, Wenyu Zhou, Maofeng Liu, Dan Li
Summary: The sensitivity of urban canopy air temperature (T-a) to anthropogenic heat flux (Q(AH)) varies with space and time, but the exact factors controlling this variability remain unclear. To understand the contributions of different physical processes to this sensitivity, a forcing-feedback framework based on the energy budget of air within the urban canopy layer was developed and applied to simulate T-a/Q(AH) in the contiguous United States. The results showed that both direct and feedback effects play a role in this sensitivity, with the direct effect being dominant in summer and the feedback effect becoming stronger in winter due to weakened negative feedback associated with heat conductance.
ENVIRONMENTAL RESEARCH LETTERS
(2023)
Article
Astronomy & Astrophysics
Bijay Kumar Guha, Jagabandhu Panda, A. S. Arya
Summary: This study utilized observations from multiple Mars orbiters to investigate the appearance of water ice clouds over two Martian volcanos, providing insights into the dynamic effects related to orographic clouds and their interactions with atmospheric transport. The results show that atmospheric temperature variations strongly influence cloud distribution, with thick low altitude clouds influenced by seasonal changes in the northern hemisphere and thin high altitude clouds associated with elevated dustiness and vertical advection in the southern hemisphere.
PLANETARY AND SPACE SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
Xian-Xiang Li, Chao Yuan, Jian Hang
Summary: Southeast Asia, a region limited by data availability, is experiencing an increased frequency, longer duration, and higher intensity of heat waves. The trends in heat wave characteristics defined by minimum temperatures are larger than those defined by maximum temperatures, indicating anomalously warm nights. The study highlights the importance of high-quality data for heat wave research in Southeast Asia.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Environmental Sciences
Sudhansu S. Rath, Srutisudha Mohanty, Jagabandhu Panda
Summary: The combination of rapid urbanization and poor planning processes/policies leads to dispersed and fragmented cities, hindering city sustainability. This study examines the level of fragmentation in eastern and southern Indian cities, revealing a heterogeneous growth pattern and different types of expansion. Night-time anthropogenic activity is found to be higher in newly developed urban areas than densely populated ones, highlighting the gaps between scientific/technological advancements and relevant policies in urban development.
JOURNAL OF THE INDIAN SOCIETY OF REMOTE SENSING
(2022)
Article
Geosciences, Multidisciplinary
Debashis Paul, Jagabandhu Panda, Ashish Routray
Summary: This study investigates the atmospheric and oceanic conditions that contribute to the formation and rapid intensification of super cyclonic storms in the North Indian Ocean basin from 1982 to 2020. The results show that ocean conditions are more conducive to tropical cyclone genesis than atmospheric conditions. Vertical wind shear and Genesis Potential Parameter play a supporting role in the genesis of cyclones. Equatorial Rossby waves are the dominant convectively coupled equatorial waves, followed by Madden Julian Oscillation. Sea surface temperature and Tropical Cyclone Heat Potential support the formation of cyclones.
Article
Meteorology & Atmospheric Sciences
Subodh Kumar, Jagabandhu Panda, Debashis Paul, Bijay Kumar Guha
Summary: This study investigates the relationship between the variability in TC radial parameters and related meteorological factors over the North Indian Ocean basin. The results show that the size parameters of tropical cyclones are increasing, while the radius of maximum wind is decreasing. The study also reveals correlations between the size of tropical cyclones and meteorological factors such as sea surface temperature and humidity.
Article
Meteorology & Atmospheric Sciences
Sudhansu S. Rath, Jagabandhu Panda, Ankan Sarkar
Summary: This study investigates the impact of urbanization and land use change on rainfall during pre-monsoon thunderstorms in Kolkata using a weather model. The results show that higher levels of urbanization are associated with increased precipitation, particularly in central and northern parts of the city. The urban heat island effect is more pronounced at night, with a temperature difference of up to 0.5 degrees Celsius. Urbanization also affects the vertical structure of the boundary layer, with a greater impact during the daytime. The study also finds that urban areas experience a drier atmosphere compared to rural areas.
METEOROLOGY AND ATMOSPHERIC PHYSICS
(2022)
Article
Construction & Building Technology
Jian Hang, Xia Yang, Cui-Yun Ou, Zhi-Wen Luo, Xiao-Dan Fan, Xue-Lin Zhang, Zhong-Li Gu, Xian-Xiang Li
Summary: Indoor-outdoor risk assessment and comparison are rare. Numerical simulations show that indoor exposure risk is higher than outdoor, especially in rooms with index patient. Outdoor infection risk should not be ignored, especially for people at leeward street corner.
BUILDING AND ENVIRONMENT
(2023)
Article
Thermodynamics
Ruiqing Du, Chun -Ho Liu, Xian-Xiang Li, Chuan-Yao Lin
Summary: This study proposed a new land use/land cover (LULC) scheme for predicting urban-scale air-conditioning load. By combining local climate zones (LCZs) and building categories (BC), the model was able to reduce the bias in temperature and humidity, as well as improve the simulation of air-conditioning load. The inclusion of LCZs and BC in the model significantly enhanced the accuracy of the predictions.
Article
Environmental Sciences
Lixin Dong, Shihao Tang, Fuzhou Wang, Michael Cosh, Xianxiang Li, Min Min
Summary: This paper utilizes the thermal infrared data from the FY-4A geostationary meteorological satellite to retrieve hourly land surface temperature (LST) and evaluates seven different algorithms. The Ulivieri (1985) algorithm is determined to be the most optimal for the FY-4A LST official products. Refined coefficients for distinguishing between dry and moist atmospheres are established, and the official LST products are successfully produced under clear-sky conditions. Validation results demonstrate that the preferred algorithm exhibits good accuracy and meets the required precision for the FY-4A mission.
Article
Green & Sustainable Science & Technology
Lup Wai Chew, Xian-Xiang Li, Michael Y. L. Chew
Summary: Singapore is a densely populated country with a majority of the population living in high-rise public flats. However, the aging and deterioration of buildings have led to an increasing number of incidents involving falling objects from a height. While a Periodic Facade Inspection (PFI) regime was implemented in 2020 to address this, it has not considered the potential impacts of climate change on building facades. This paper identifies the common causes of facade defects that can be impacted by climate change, and discusses the need for revising and improving the PFI regime to incorporate climate change impacts.
Article
Environmental Sciences
Wenhui He, Xian-Xiang Li, Xiaohu Zhang, Tiangang Yin, Leslie K. Norford, Chao Yuan
Summary: This paper presents a solution to estimate the anthropogenic heat from buildings in Singapore by using a random forest classification model based on multiple data sources. The results show that the annual average anthropogenic heat from different types of buildings in Singapore ranges from 1.1 to 12.1 W m-2. This approach can help integrate data from different sources and benefit urban planning and climate modeling. Overall, the paper is rated 8 out of 10 in importance.
Article
Environmental Sciences
Jagabandhu Panda, Sunny Kant, Ankan Sarkar
Summary: This study investigates the impact of aerosols on cloud properties during positive and negative Indian Ocean Dipole (IOD) months in South Asia using long-term satellite-based observations and reanalyses datasets. The study finds significant differences in aerosol optical depth (AOD) between the two IOD phases, with positive AOD differences mainly over land areas and some parts of the Indian Ocean, and negative AOD differences over the equatorial Indian Ocean and certain regions of Indian landmass. The study also observes a strong negative relationship between cloud fraction (CF) and cloud top pressure and cloud optical depth (COD), indicating the existence of optically thick clouds during IOD months. The Twomey effect is noticed in the study region during both IOD phases, regardless of meteorological conditions. CF and COD both increase with higher AOD, high relative humidity, and stronger updrafts, suggesting the role of prevailing meteorology in forming thicker clouds. However, cloud tops are lower in polluted conditions. The aerosol-cloud relationships observed during IOD scenarios are attributed to prevailing meteorology.
ATMOSPHERIC POLLUTION RESEARCH
(2023)
Article
Meteorology & Atmospheric Sciences
Shaofeng Liu, Xubin Zeng, Yongjiu Dai, Hua Yuan, Nan Wei, Zhongwang Wei, Xingjie Lu, Shupeng Zhang, Xian-Xiang Li
Summary: In this paper, the scale-dependent estimability of turbulent flux in the unstable surface layer is systematically investigated based on high-resolution large-eddy simulation data. It is found that turbulent flow in the unstable surface layer inherently fluctuates over a wide range of scales. Sensitivity tests show that the relative root mean square error of the estimated surface friction velocity generally increases as the subdomain becomes smaller.
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
(2023)
Article
Geochemistry & Geophysics
Jagabandhu Panda, Sudhansu S. Rath
Summary: The city of Chennai in southern India experienced record-breaking rainfall in 2015, leading to severe urban flooding. The study suggests that this rainfall event was the result of three large-scale systems and the feedback of urban heating. Using the WRF modeling system, simulations were conducted which showed agreement with observations. The study also found that an increase in urban built-up area affected rainfall distribution and that high-resolution atmospheric and sea surface temperature initialization improved model results.
PURE AND APPLIED GEOPHYSICS
(2022)
Article
Environmental Sciences
Lian Zong, Yuanjian Yang, Haiyun Xia, Meng Gao, Zhaobin Sun, Zuofang Zheng, Xianxiang Li, Guicai Ning, Yubin Li, Simone Lolli
Summary: Heatwaves paired with higher ozone concentration pose a serious threat to human health. This study in Beijing identified three synoptic weather patterns that contribute to compound heatwaves and ozone pollution events. These patterns are characterized by sinking air motion, low boundary layer height, and high temperatures. The synergy of heatwaves and ozone pollution increased the mortality risk from all non-accidental causes. Urbanization also played a role in increasing the risk of heatwaves and ozone pollution in urban areas.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
