Contribution of biophysical factors to regional variations of evapotranspiration and seasonal cooling effects in paddy rice in south korea

Wei Xue; Seungtaek Jeong; Jonghan Ko; Jong Min Yeom

doi:10.3390/rs13193992

Contribution of biophysical factors to regional variations of evapotranspiration and seasonal cooling effects in paddy rice in south korea

Wei Xue^*
, Seungtaek Jeong
, Jonghan Ko
, Jong Min Yeom

^*Corresponding author for this work

Department of Earth and Environmental Sciences

Lanzhou University
Korea Aerospace Research Institute
Chonnam National University

Research output: Contribution to journal › Journal article › peer-review

8 Scopus citations

Abstract

Previous studies have observed seasonal cooling effects in paddy rice as compared to temperate forest through enhanced evapotranspiration (ET) in Northeast Asia, while rare studies have revealed biophysical factors responsible for spatial variations of ET and its cooling effects. In this study, we adopted a data fusion method that integrated MODIS 8-day surface reflectance products, gridded daily climate data of ground surface, and a remote sensing pixel-based Penman-Monteith ET model (i.e., the RS–PM model) to quantify ET patterns of paddy rice in South Korea from 2011 to 2014. Results indicated that the regional variations of the rice-growing season ET (RGS-ET, the sum of daily ET from the season onset of rapid canopy expansion (SoS) to the end of the rice-growing season (EGS)) were primarily influenced by phenological factors (i.e., the length of growing period-LGP), followed by growing season mean climatic factors (i.e., vapor pressure deficit-VPD, and air temperature). For regional variations of the paddy field ET (PF-ET, the sum of daily ET from the field flooding and transplanting date detected by satellite observations (FFTD_sat ) to SoS, and to EGS), the extents were substantially reduced, only accounting for 54% of the RGS-ET variations. The FFTD_sat and SoS were considered critical for the reduced PF-ET variations. In comparison to the temperate forest, changes in monthly ground surface air temperature (T_s ) in paddy fields showed the V-shaped seasonal pattern with significant cooling effects found in late spring and early summer, primarily due to a large decline in daytime T_s that exceeded the nighttime warming. Bringing FFTD_sat towards late spring and early summer was identified as vital field management practices, causing significant declines in daytime T_s due to enhanced ET. Results highlighted climate-warming mitigation by paddy fields due to early flooding practices.

Original language	English
Article number	3992
Journal	Remote Sensing
Volume	13
Issue number	19
DOIs	https://doi.org/10.3390/rs13193992
State	Published - 2021.10.1

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 6 Clean Water and Sanitation
SDG 13 Climate Action

Keywords

Cooling effects
Evapotranspiration
Numerical simulation
Paddy rice
Phenology
Remote sensing
Water management

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10.3390/rs13193992

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@article{116adad958a44371806604b24f5fd68f,

title = "Contribution of biophysical factors to regional variations of evapotranspiration and seasonal cooling effects in paddy rice in south korea",

abstract = "Previous studies have observed seasonal cooling effects in paddy rice as compared to temperate forest through enhanced evapotranspiration (ET) in Northeast Asia, while rare studies have revealed biophysical factors responsible for spatial variations of ET and its cooling effects. In this study, we adopted a data fusion method that integrated MODIS 8-day surface reflectance products, gridded daily climate data of ground surface, and a remote sensing pixel-based Penman-Monteith ET model (i.e., the RS–PM model) to quantify ET patterns of paddy rice in South Korea from 2011 to 2014. Results indicated that the regional variations of the rice-growing season ET (RGS-ET, the sum of daily ET from the season onset of rapid canopy expansion (SoS) to the end of the rice-growing season (EGS)) were primarily influenced by phenological factors (i.e., the length of growing period-LGP), followed by growing season mean climatic factors (i.e., vapor pressure deficit-VPD, and air temperature). For regional variations of the paddy field ET (PF-ET, the sum of daily ET from the field flooding and transplanting date detected by satellite observations (FFTDsat ) to SoS, and to EGS), the extents were substantially reduced, only accounting for 54\% of the RGS-ET variations. The FFTDsat and SoS were considered critical for the reduced PF-ET variations. In comparison to the temperate forest, changes in monthly ground surface air temperature (Ts ) in paddy fields showed the V-shaped seasonal pattern with significant cooling effects found in late spring and early summer, primarily due to a large decline in daytime Ts that exceeded the nighttime warming. Bringing FFTDsat towards late spring and early summer was identified as vital field management practices, causing significant declines in daytime Ts due to enhanced ET. Results highlighted climate-warming mitigation by paddy fields due to early flooding practices.",

keywords = "Cooling effects, Evapotranspiration, Numerical simulation, Paddy rice, Phenology, Remote sensing, Water management",

author = "Wei Xue and Seungtaek Jeong and Jonghan Ko and Yeom, \{Jong Min\}",

note = "Publisher Copyright: {\textcopyright} 2021 by the authors. Licensee MDPI, Basel, Switzerland.",

year = "2021",

month = oct,

day = "1",

doi = "10.3390/rs13193992",

language = "English",

volume = "13",

journal = "Remote Sensing",

issn = "2072-4292",

number = "19",

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TY - JOUR

T1 - Contribution of biophysical factors to regional variations of evapotranspiration and seasonal cooling effects in paddy rice in south korea

AU - Xue, Wei

AU - Jeong, Seungtaek

AU - Ko, Jonghan

AU - Yeom, Jong Min

PY - 2021/10/1

Y1 - 2021/10/1

N2 - Previous studies have observed seasonal cooling effects in paddy rice as compared to temperate forest through enhanced evapotranspiration (ET) in Northeast Asia, while rare studies have revealed biophysical factors responsible for spatial variations of ET and its cooling effects. In this study, we adopted a data fusion method that integrated MODIS 8-day surface reflectance products, gridded daily climate data of ground surface, and a remote sensing pixel-based Penman-Monteith ET model (i.e., the RS–PM model) to quantify ET patterns of paddy rice in South Korea from 2011 to 2014. Results indicated that the regional variations of the rice-growing season ET (RGS-ET, the sum of daily ET from the season onset of rapid canopy expansion (SoS) to the end of the rice-growing season (EGS)) were primarily influenced by phenological factors (i.e., the length of growing period-LGP), followed by growing season mean climatic factors (i.e., vapor pressure deficit-VPD, and air temperature). For regional variations of the paddy field ET (PF-ET, the sum of daily ET from the field flooding and transplanting date detected by satellite observations (FFTDsat ) to SoS, and to EGS), the extents were substantially reduced, only accounting for 54% of the RGS-ET variations. The FFTDsat and SoS were considered critical for the reduced PF-ET variations. In comparison to the temperate forest, changes in monthly ground surface air temperature (Ts ) in paddy fields showed the V-shaped seasonal pattern with significant cooling effects found in late spring and early summer, primarily due to a large decline in daytime Ts that exceeded the nighttime warming. Bringing FFTDsat towards late spring and early summer was identified as vital field management practices, causing significant declines in daytime Ts due to enhanced ET. Results highlighted climate-warming mitigation by paddy fields due to early flooding practices.

AB - Previous studies have observed seasonal cooling effects in paddy rice as compared to temperate forest through enhanced evapotranspiration (ET) in Northeast Asia, while rare studies have revealed biophysical factors responsible for spatial variations of ET and its cooling effects. In this study, we adopted a data fusion method that integrated MODIS 8-day surface reflectance products, gridded daily climate data of ground surface, and a remote sensing pixel-based Penman-Monteith ET model (i.e., the RS–PM model) to quantify ET patterns of paddy rice in South Korea from 2011 to 2014. Results indicated that the regional variations of the rice-growing season ET (RGS-ET, the sum of daily ET from the season onset of rapid canopy expansion (SoS) to the end of the rice-growing season (EGS)) were primarily influenced by phenological factors (i.e., the length of growing period-LGP), followed by growing season mean climatic factors (i.e., vapor pressure deficit-VPD, and air temperature). For regional variations of the paddy field ET (PF-ET, the sum of daily ET from the field flooding and transplanting date detected by satellite observations (FFTDsat ) to SoS, and to EGS), the extents were substantially reduced, only accounting for 54% of the RGS-ET variations. The FFTDsat and SoS were considered critical for the reduced PF-ET variations. In comparison to the temperate forest, changes in monthly ground surface air temperature (Ts ) in paddy fields showed the V-shaped seasonal pattern with significant cooling effects found in late spring and early summer, primarily due to a large decline in daytime Ts that exceeded the nighttime warming. Bringing FFTDsat towards late spring and early summer was identified as vital field management practices, causing significant declines in daytime Ts due to enhanced ET. Results highlighted climate-warming mitigation by paddy fields due to early flooding practices.

KW - Cooling effects

KW - Evapotranspiration

KW - Numerical simulation

KW - Paddy rice

KW - Phenology

KW - Remote sensing

KW - Water management

UR - https://www.scopus.com/pages/publications/85116704052

U2 - 10.3390/rs13193992

DO - 10.3390/rs13193992

M3 - Journal article

AN - SCOPUS:85116704052

SN - 2072-4292

VL - 13

JO - Remote Sensing

JF - Remote Sensing

IS - 19

M1 - 3992

ER -

Contribution of biophysical factors to regional variations of evapotranspiration and seasonal cooling effects in paddy rice in south korea

Abstract

UN SDGs

Keywords

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