A daily and 500 m coupled evapotranspiration and gross primary production product across China during 2000–2020
<p>Accurate high-resolution actual evapotranspiration (ET) and gross primary production (GPP) information is essential for understanding the large-scale water and carbon dynamics. However, substantial uncertainties exist in the current ET and GPP datasets in China because of insufficient local...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2022-12-01
|
| Series: | Earth System Science Data |
| Online Access: | https://essd.copernicus.org/articles/14/5463/2022/essd-14-5463-2022.pdf |
| _version_ | 1811295697782177792 |
|---|---|
| author | S. He S. He Y. Zhang N. Ma J. Tian D. Kong C. Liu |
| author_facet | S. He S. He Y. Zhang N. Ma J. Tian D. Kong C. Liu |
| author_sort | S. He |
| collection | DOAJ |
| description | <p>Accurate high-resolution actual evapotranspiration (ET)
and gross primary production (GPP) information is essential for
understanding the large-scale water and carbon dynamics. However,
substantial uncertainties exist in the current ET and GPP datasets in China
because of insufficient local ground measurements used for model constraint. This study utilizes a water–carbon coupled model, Penman–Monteith–Leuning Version 2 (PML-V2), to estimate 500 m ET and GPP at a daily scale. The parameters of PML-V2(China) were well calibrated against observations of 26 eddy covariance flux towers across nine plant functional types in China,
indicated by a Nash–Sutcliffe efficiency (NSE) of 0.75 and a root mean square error (RMSE) of 0.69 mm d<span class="inline-formula"><sup>−1</sup></span> for daily ET, respectively, and a NSE of 0.82 and a RMSE of 1.71 g C m<span class="inline-formula"><sup>−2</sup></span> d<span class="inline-formula"><sup>−1</sup></span> for daily GPP. The model estimates get a small Bias of 6.28 % and a high NSE of 0.82 against water-balance annual ET estimates
across 10 major river basins in China. Further evaluations suggest that the
newly developed product is better than other typical products (MOD16A2,
SEBAL, GLEAM, MOD17A2H, VPM, and EC-LUE) in estimating both ET and GPP. Moreover, PML-V2(China) accurately monitors the intra-annual variations in ET and GPP in the croplands with a dual-cropping system. The new data showed
that, during 2001–2018, the annual GPP and water use efficiency experienced a significant (<span class="inline-formula"><i>p</i><0</span>.001) increase (8.99 g C m<span class="inline-formula"><sup>−2</sup></span> yr<span class="inline-formula"><sup>−2</sup></span> and
0.02 g C mm<span class="inline-formula"><sup>−1</sup></span> H<span class="inline-formula"><sub>2</sub></span>O yr<span class="inline-formula"><sup>−1</sup></span>, respectively), but annual ET showed a
non-significant (<span class="inline-formula"><i>p</i>>0</span>.05) increase (0.43 mm yr<span class="inline-formula"><sup>−2</sup></span>). This
indicates that vegetation in China exhibits a huge potential for carbon
sequestration with little cost in water resources. The PML-V2(China) product
provides a great opportunity for academic communities and various agencies
for scientific studies and applications, freely available at
<a href="https://doi.org/10.11888/Terre.tpdc.272389">https://doi.org/10.11888/Terre.tpdc.272389</a> (Zhang and He, 2022).</p> |
| first_indexed | 2024-04-13T05:37:19Z |
| format | Article |
| id | doaj.art-3bfaa0b5f5ed4fa1a28c5541e6f5ddd4 |
| institution | Directory Open Access Journal |
| issn | 1866-3508 1866-3516 |
| language | English |
| last_indexed | 2024-04-13T05:37:19Z |
| publishDate | 2022-12-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Earth System Science Data |
| spelling | doaj.art-3bfaa0b5f5ed4fa1a28c5541e6f5ddd42022-12-22T03:00:13ZengCopernicus PublicationsEarth System Science Data1866-35081866-35162022-12-01145463548810.5194/essd-14-5463-2022A daily and 500 m coupled evapotranspiration and gross primary production product across China during 2000–2020S. He0S. He1Y. Zhang2N. Ma3J. Tian4D. Kong5C. Liu6Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, ChinaCollege of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100040, ChinaKey Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, ChinaKey Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, ChinaKey Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, ChinaDepartment of Atmospheric Science, School of Environmental Studies, China University of Geosciences, Wuhan 430074, ChinaKey Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China<p>Accurate high-resolution actual evapotranspiration (ET) and gross primary production (GPP) information is essential for understanding the large-scale water and carbon dynamics. However, substantial uncertainties exist in the current ET and GPP datasets in China because of insufficient local ground measurements used for model constraint. This study utilizes a water–carbon coupled model, Penman–Monteith–Leuning Version 2 (PML-V2), to estimate 500 m ET and GPP at a daily scale. The parameters of PML-V2(China) were well calibrated against observations of 26 eddy covariance flux towers across nine plant functional types in China, indicated by a Nash–Sutcliffe efficiency (NSE) of 0.75 and a root mean square error (RMSE) of 0.69 mm d<span class="inline-formula"><sup>−1</sup></span> for daily ET, respectively, and a NSE of 0.82 and a RMSE of 1.71 g C m<span class="inline-formula"><sup>−2</sup></span> d<span class="inline-formula"><sup>−1</sup></span> for daily GPP. The model estimates get a small Bias of 6.28 % and a high NSE of 0.82 against water-balance annual ET estimates across 10 major river basins in China. Further evaluations suggest that the newly developed product is better than other typical products (MOD16A2, SEBAL, GLEAM, MOD17A2H, VPM, and EC-LUE) in estimating both ET and GPP. Moreover, PML-V2(China) accurately monitors the intra-annual variations in ET and GPP in the croplands with a dual-cropping system. The new data showed that, during 2001–2018, the annual GPP and water use efficiency experienced a significant (<span class="inline-formula"><i>p</i><0</span>.001) increase (8.99 g C m<span class="inline-formula"><sup>−2</sup></span> yr<span class="inline-formula"><sup>−2</sup></span> and 0.02 g C mm<span class="inline-formula"><sup>−1</sup></span> H<span class="inline-formula"><sub>2</sub></span>O yr<span class="inline-formula"><sup>−1</sup></span>, respectively), but annual ET showed a non-significant (<span class="inline-formula"><i>p</i>>0</span>.05) increase (0.43 mm yr<span class="inline-formula"><sup>−2</sup></span>). This indicates that vegetation in China exhibits a huge potential for carbon sequestration with little cost in water resources. The PML-V2(China) product provides a great opportunity for academic communities and various agencies for scientific studies and applications, freely available at <a href="https://doi.org/10.11888/Terre.tpdc.272389">https://doi.org/10.11888/Terre.tpdc.272389</a> (Zhang and He, 2022).</p>https://essd.copernicus.org/articles/14/5463/2022/essd-14-5463-2022.pdf |
| spellingShingle | S. He S. He Y. Zhang N. Ma J. Tian D. Kong C. Liu A daily and 500 m coupled evapotranspiration and gross primary production product across China during 2000–2020 Earth System Science Data |
| title | A daily and 500 m coupled evapotranspiration and gross primary production product across China during 2000–2020 |
| title_full | A daily and 500 m coupled evapotranspiration and gross primary production product across China during 2000–2020 |
| title_fullStr | A daily and 500 m coupled evapotranspiration and gross primary production product across China during 2000–2020 |
| title_full_unstemmed | A daily and 500 m coupled evapotranspiration and gross primary production product across China during 2000–2020 |
| title_short | A daily and 500 m coupled evapotranspiration and gross primary production product across China during 2000–2020 |
| title_sort | daily and 500 thinsp m coupled evapotranspiration and gross primary production product across china during 2000 2020 |
| url | https://essd.copernicus.org/articles/14/5463/2022/essd-14-5463-2022.pdf |
| work_keys_str_mv | AT she adailyand500thinspmcoupledevapotranspirationandgrossprimaryproductionproductacrosschinaduring20002020 AT she adailyand500thinspmcoupledevapotranspirationandgrossprimaryproductionproductacrosschinaduring20002020 AT yzhang adailyand500thinspmcoupledevapotranspirationandgrossprimaryproductionproductacrosschinaduring20002020 AT nma adailyand500thinspmcoupledevapotranspirationandgrossprimaryproductionproductacrosschinaduring20002020 AT jtian adailyand500thinspmcoupledevapotranspirationandgrossprimaryproductionproductacrosschinaduring20002020 AT dkong adailyand500thinspmcoupledevapotranspirationandgrossprimaryproductionproductacrosschinaduring20002020 AT cliu adailyand500thinspmcoupledevapotranspirationandgrossprimaryproductionproductacrosschinaduring20002020 AT she dailyand500thinspmcoupledevapotranspirationandgrossprimaryproductionproductacrosschinaduring20002020 AT she dailyand500thinspmcoupledevapotranspirationandgrossprimaryproductionproductacrosschinaduring20002020 AT yzhang dailyand500thinspmcoupledevapotranspirationandgrossprimaryproductionproductacrosschinaduring20002020 AT nma dailyand500thinspmcoupledevapotranspirationandgrossprimaryproductionproductacrosschinaduring20002020 AT jtian dailyand500thinspmcoupledevapotranspirationandgrossprimaryproductionproductacrosschinaduring20002020 AT dkong dailyand500thinspmcoupledevapotranspirationandgrossprimaryproductionproductacrosschinaduring20002020 AT cliu dailyand500thinspmcoupledevapotranspirationandgrossprimaryproductionproductacrosschinaduring20002020 |