A global historical twice-daily (daytime and nighttime) land surface temperature dataset produced by Advanced Very High Resolution Radiometer observations from 1981 to 2021
<p>Land surface temperature (LST) is a key variable for monitoring and evaluating global long-term climate change. However, existing satellite-based twice-daily LST products only date back to 2000, which makes it difficult to obtain robust long-term temperature variations. In this study, we de...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2023-05-01
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| Series: | Earth System Science Data |
| Online Access: | https://essd.copernicus.org/articles/15/2189/2023/essd-15-2189-2023.pdf |
| Summary: | <p>Land surface temperature (LST) is a key variable for
monitoring and evaluating global long-term climate change. However, existing
satellite-based twice-daily LST products only date back to 2000, which makes
it difficult to obtain robust long-term temperature variations. In this
study, we developed the first global historical twice-daily LST dataset
(GT-LST), with a spatial resolution of 0.05<span class="inline-formula"><sup>∘</sup></span>, using Advanced Very
High Resolution Radiometer (AVHRR) Level-1b Global Area Coverage (GAC) data
from 1981 to 2021. The GT-LST product was generated using four main
processes: (1) GAC data reading, calibration, and preprocessing using open-source Python libraries; (2) cloud detection using the AVHRR-Phase I
algorithm; (3) land surface emissivity estimation using an improved method
considering annual land cover changes; (4) LST retrieval based on a nonlinear generalized split-window algorithm. Validation with in situ
measurements from Surface Radiation Budget (SURFRAD) sites and Baseline
Surface Radiation Network sites showed that the overall root-mean-square
errors (RMSEs) of GT-LST varied from 1.6 to 4.0 K, and nighttime LSTs were typically better than daytime LSTs. Intercomparison with the Moderate Resolution Imaging Spectroradiometer LST products (MYD11A1 and MYD21A1)
revealed that the overall root-mean-square difference (RMSD) was approximately 3.0 K. Compared with MYD11A1 LST, GT-LST was overestimated,
and relatively large RMSDs were obtained during the daytime, spring, and summer, whereas the significantly smaller positive bias was obtained between
GT-LST and MYD21A1 LST. Furthermore, we compared our newly generated dataset
with a global AVHRR daytime LST product at the selected measurements of
SURFRAD sites (i.e., measurements of these two satellite datasets were
valid), which revealed similar accuracies for the two datasets. However,
GT-LST can additionally provide nighttime LST, which can be combined with
daytime observations estimating relatively accurate monthly mean LST, with an RMSE of 2.7 K. Finally, we compared GT-LST with a regional twice-daily AVHRR
LST product over continental Africa in different seasons, with RMSDs ranging
from 2.1 to 4.3 K. Considering these advantages, the proposed dataset
provides a better data source for a range of research applications. GT-LST
is freely available at <a href="https://doi.org/10.5281/zenodo.7113080">https://doi.org/10.5281/zenodo.7113080</a> (1981–2000)
(Li et al., 2022a), <a href="https://doi.org/10.5281/zenodo.7134158">https://doi.org/10.5281/zenodo.7134158</a> (2001–2005) (Li
et al., 2022b), and <a href="https://doi.org/10.5281/zenodo.7813607">https://doi.org/10.5281/zenodo.7813607</a> (2006–2021) (J. H. Li et al., 2023).</p> |
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| ISSN: | 1866-3508 1866-3516 |