Assessing the Impacts of Urbanization on Albedo in Jing-Jin-Ji Region of China
As an indicative parameter that represents the ability of the Earth’s surface to reflect solar radiation, albedo determines the allocation of solar energy between the Earth’s surface and the atmosphere, which plays an important role in both global and local climate change. Urbani...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2018-07-01
|
| Series: | Remote Sensing |
| Subjects: | |
| Online Access: | http://www.mdpi.com/2072-4292/10/7/1096 |
| _version_ | 1819294506619502592 |
|---|---|
| author | Rongyun Tang Xiang Zhao Tao Zhou Bo Jiang Donghai Wu Bijian Tang |
| author_facet | Rongyun Tang Xiang Zhao Tao Zhou Bo Jiang Donghai Wu Bijian Tang |
| author_sort | Rongyun Tang |
| collection | DOAJ |
| description | As an indicative parameter that represents the ability of the Earth’s surface to reflect solar radiation, albedo determines the allocation of solar energy between the Earth’s surface and the atmosphere, which plays an important role in both global and local climate change. Urbanization is a complicated progress that greatly affects urban albedo via land cover change, human heat, aerosol, and other human activities. Although many studies have been conducted to identify the effects of these various factors on albedo separately, there are few studies that have quantitatively determined the combined effects of urbanization on albedo. In this study, based on a partial derivative method, vegetation index data and nighttime light data were used to quantitatively calculate the natural climate change and human activities’ contributions to albedo variations in the Jing-Jin-Ji region, during its highest population growth period from 2001 to 2011. The results show that (1) 2005 is the year when urbanization starts accelerating in the Jing-Jin-Ji region; (2) albedo trends are equal to 0.0065 year−1 before urbanization and 0.0012 year−1 after urbanization, which is a reduction of 4/5; and (3) the contribution rate of urbanization increases from 15% to 48.4%, which leads to a decrease in albedo of approximately 0.05. Understanding the contribution of urbanization to variations in urban albedo is significant for future studies on urban climate change via energy balance and can provide scientific data for energy conservation policymaking. |
| first_indexed | 2024-12-24T04:27:24Z |
| format | Article |
| id | doaj.art-01cd23cceb45430db00a8ffa8f562103 |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-12-24T04:27:24Z |
| publishDate | 2018-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj.art-01cd23cceb45430db00a8ffa8f5621032022-12-21T17:15:32ZengMDPI AGRemote Sensing2072-42922018-07-01107109610.3390/rs10071096rs10071096Assessing the Impacts of Urbanization on Albedo in Jing-Jin-Ji Region of ChinaRongyun Tang0Xiang Zhao1Tao Zhou2Bo Jiang3Donghai Wu4Bijian Tang5State Key Laboratory of Remote Sensing Science, Jointly Sponsored by Beijing Normal University and Institute of Remote Sensing and Digital Earth of Chinese Academy of Sciences, Beijing 100875, ChinaState Key Laboratory of Remote Sensing Science, Jointly Sponsored by Beijing Normal University and Institute of Remote Sensing and Digital Earth of Chinese Academy of Sciences, Beijing 100875, ChinaKey Laboratory of Environmental Change and Natural Disaster of Ministry of Education, Academy of Disaster Reduction and Emergency Management, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, ChinaState Key Laboratory of Remote Sensing Science, Jointly Sponsored by Beijing Normal University and Institute of Remote Sensing and Digital Earth of Chinese Academy of Sciences, Beijing 100875, ChinaCollege of Urban and Environmental Sciences, Peking University, Beijing 100871, ChinaDivision of Environment and Sustainability, The Hong Kong University of Science and Technology, Kowloon, Hong Kong, ChinaAs an indicative parameter that represents the ability of the Earth’s surface to reflect solar radiation, albedo determines the allocation of solar energy between the Earth’s surface and the atmosphere, which plays an important role in both global and local climate change. Urbanization is a complicated progress that greatly affects urban albedo via land cover change, human heat, aerosol, and other human activities. Although many studies have been conducted to identify the effects of these various factors on albedo separately, there are few studies that have quantitatively determined the combined effects of urbanization on albedo. In this study, based on a partial derivative method, vegetation index data and nighttime light data were used to quantitatively calculate the natural climate change and human activities’ contributions to albedo variations in the Jing-Jin-Ji region, during its highest population growth period from 2001 to 2011. The results show that (1) 2005 is the year when urbanization starts accelerating in the Jing-Jin-Ji region; (2) albedo trends are equal to 0.0065 year−1 before urbanization and 0.0012 year−1 after urbanization, which is a reduction of 4/5; and (3) the contribution rate of urbanization increases from 15% to 48.4%, which leads to a decrease in albedo of approximately 0.05. Understanding the contribution of urbanization to variations in urban albedo is significant for future studies on urban climate change via energy balance and can provide scientific data for energy conservation policymaking.http://www.mdpi.com/2072-4292/10/7/1096surface albedourbanizationvegetation variationclimate changeDMSP |
| spellingShingle | Rongyun Tang Xiang Zhao Tao Zhou Bo Jiang Donghai Wu Bijian Tang Assessing the Impacts of Urbanization on Albedo in Jing-Jin-Ji Region of China Remote Sensing surface albedo urbanization vegetation variation climate change DMSP |
| title | Assessing the Impacts of Urbanization on Albedo in Jing-Jin-Ji Region of China |
| title_full | Assessing the Impacts of Urbanization on Albedo in Jing-Jin-Ji Region of China |
| title_fullStr | Assessing the Impacts of Urbanization on Albedo in Jing-Jin-Ji Region of China |
| title_full_unstemmed | Assessing the Impacts of Urbanization on Albedo in Jing-Jin-Ji Region of China |
| title_short | Assessing the Impacts of Urbanization on Albedo in Jing-Jin-Ji Region of China |
| title_sort | assessing the impacts of urbanization on albedo in jing jin ji region of china |
| topic | surface albedo urbanization vegetation variation climate change DMSP |
| url | http://www.mdpi.com/2072-4292/10/7/1096 |
| work_keys_str_mv | AT rongyuntang assessingtheimpactsofurbanizationonalbedoinjingjinjiregionofchina AT xiangzhao assessingtheimpactsofurbanizationonalbedoinjingjinjiregionofchina AT taozhou assessingtheimpactsofurbanizationonalbedoinjingjinjiregionofchina AT bojiang assessingtheimpactsofurbanizationonalbedoinjingjinjiregionofchina AT donghaiwu assessingtheimpactsofurbanizationonalbedoinjingjinjiregionofchina AT bijiantang assessingtheimpactsofurbanizationonalbedoinjingjinjiregionofchina |