Abstract
Land use and land cover change (LUCC) has been increasingly recognized as having important effects on climate systems. Paddy fields, one kind of artificial wetland, have seen a significant increase in the Sanjiang Plain, China since 2000 and have become the most typical LUCC at the regional scale. Against this background, in this paper, we discuss the effects of this artificial wetland increase on surface temperature, in addition to its driving mechanisms. Firstly, the spatiotemporal variations of land surface temperature (LST) and its two driving variables (albedo and latent heat flux (LE)) in the Sanjiang Plain are analyzed and assessed based on remote sensing observation information from 2001 to 2015. Our results from both spatial distribution difference and time series analysis show that paddy field expansion led to day-time cooling and night-time warming over the study area. However, the LST changes show different characteristics and magnitudes in the spring (May to June) compared to the other months of the growing season (July to September). The daytime cooling trend is found to be −0.3842 K/year and the warming trend at night 0.1988 K/year during the period 2001 to 2015, resulting in an overall cooling effect in May and June. In July–September, the LST changes have the same sign but a smaller magnitude, with a −0.0686 K/year temperature trend seen for the day-time and a 0.0569 K/year increase for the night-time. As a consequence, a pronounced decrease in the diurnal temperature range is detected in the growing season, especially in spring. Furthermore, albedo and LE are demonstrated to be very sensitive to land use changes, especially in the earlier periods of the growing season. Correlation analysis between LST and albedo and LE also indicates the dominant role played by evapotranspiration in paddy fields in regulating local temperature.
Highlights
Land use and land cover change (LUCC) plays an important role in regulating climate systems at different scales ranging from the global and regional to the local [1,2,3,4,5,6]
Our results from regional statistical average calculations, spatial distribution differences, and time series analysis showed that paddy field expansion led to day-time cooling and night-time warming over the study area
From regional statistical analysis we found that the daily land surface temperature (LST) in paddy fields was 1.62 and 2.10 K cooler than that of rainfed farmland in May and June, respectively, while in July–September, the LST difference between the two land use types was no more than 1 K
Summary
Land use and land cover change (LUCC) plays an important role in regulating climate systems at different scales ranging from the global and regional to the local [1,2,3,4,5,6]. Numerous studies have documented the spatiotemporally varied role that LUCC plays in modifying climate systems [5,11,12,13], among which deforestation and afforestation in different heat zones and different time periods is the most typical type of LUCC identified [14,15,16,17]. In this paper we focus mainly on the climatic effects of artificial wetland increase
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
