Evaluation of products 3B42 v7 and 3IMERG for the hydroclimatic regions of Chile

Soto-Alvarez, Marco; Alcayaga, Hernán; Alarcon, Vladimir J.; Caamaño, Diego; Palma, Sebastián; Escanilla, Rossana

doi:10.1016/j.jsames.2020.102870

Cited by 4 publications

(4 citation statements)

References 32 publications

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“…Among the most widely recognized and currently used precipitation estimates is the Climate Prediction Center Morphing Method (CMORPH) [11][12][13]. A very popular satellite product devoted to measuring moderate to high rainfall is Multi-Satellite Precipitation Analysis (TMPA, known as 3B42) [14][15][16]. In addition, other popular precipitation products are widely used, such as Hydroestimator (HYDRO) [16], Precipitation Estimation from Remotely Sensed Information using artificial neural networks (PER-SIANN) [17,18], and the new satellite Global Precipitation Measurement (GPM) [10,19,20].…”

Section: Introductionmentioning

confidence: 99%

“…However, they showed a moderate correlation performance in Iran [21]. Other studies evaluated the different IMERG products in Iran [22], Finland [10], Greece [23], South America [24], Brazil [25][26][27], Saudi Arabia [19,28,29], Indonesia [30], Ecuador [31], Pakistan [32] and Chile [15,20,33].…”

Section: Introductionmentioning

confidence: 99%

“…For the severe event that took place from 28-31 January 2021, Junqueira et al [25] showed that a correlation of 0.73 was achieved between the gridded IMERG Final product estimates and the gauge measurements. On the other hand, Soto Alvarez et al [15] analyzed the performance of IMERG Late and Final products for four different macro zones around Chile. No study has been done on the regional and temporal performance of the IMERG Early product over Chile, nor on its effectiveness in detecting precipitation events across the nation.…”

Section: Introductionmentioning

confidence: 99%

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Assessment of the IMERG Early-Run Precipitation Estimates over South American Country of Chile

et al. 2023

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Accurate rainfall measurement is a challenge, especially in regions with diverse climates and complex topography. Thus, knowledge of precipitation patterns requires observational networks with a very high spatial and temporal resolution, which is very difficult to construct in remote areas with complex geological features such as desert areas and mountains, particularly in countries with high topographical variability such as Chile. This study evaluated the performance of the near-real-time Integrated Multi-satellite Retrievals for GPM (IMERG) Early product throughout Chile, a country located in South America between 16° S–66° S latitude. The accuracy of the IMERG Early was assessed at different special and temporal scales from 2015 to 2020. Relative Bias (PBIAS), Mean Absolute Error (MAE), and Root-Mean-Squared Error (RMSE) were used to quantify the errors in the satellite estimates, while the Probability of Detection (POD), False Alarm Ratio (FAR), and Critical Success Index (CSI) were used to evaluate product detection accuracy. In addition, the consistency between the satellite estimates and the ground observations was assessed using the Correlation Coefficient (CC). The spatial results show that the IMERG Early had the best performance over the central zone, while the best temporal performance was detected for the yearly precipitation dataset. In addition, as latitude increases, so do errors. Also, the satellite product tends to slightly overestimate the precipitation throughout the country. The results of this study could contribute towards the improvement of the IMERG algorithms and open research opportunities in areas with high latitudes, such as Chile.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Assessment of the IMERG Early-Run Precipitation Estimates over South American Country of Chile

et al. 2023

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“…Extending for over 4,000 km along a wide range of geographical environments and climatic contexts – with diverse types and magnitude of recent human impacts – Chile represents an ideal location to disentangle the relative role of different climatic and direct human impacts on river changes. Considering the three hydroclimatic zones identified by Soto‐Alvarez et al (2020) in Central and Southern Chile – Central, South, and Austral zones – future attempts to pool together evidence of river changes could help to quantify the relative importance of different impacts (for example, impacts could be classified by trend and magnitude of the river responses). The Central zone is characterized by the highest density of dams, water extraction projects, and gravel mining, especially on rivers flowing near large cities.…”

Section: Discussionmentioning

confidence: 99%

Synergistic process interactions and morphological change in a river reach subject to multiple disturbances, the Laja River, Chile

Barahona,

Alcayaga,

Caamaño

et al. 2024

Earth Surf Processes Landf

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This work studies the multiple sources of impacts and disturbances in the Laja River (Central Chile) and evaluates the changes in water and sediment flows and planimetric geomorphic changes.The disturbances sources correspond to hydroelectric plants, water withdrawals for irrigation and the sustained decrease trend in rainfall in the basin. The changes in the plan‐view shape of the river reach were quantified using remote sensing techniques, through a supervised classification of Landsat 5 TM and 8 OLI satellite images, identified Water (W), Islands and Riverine Vegetation (IRV) and Bars and Banks Without Vegetation (BBWV), obtained a Kappa index>0,83 for a period of 15 years (2006–2021).Compared with historical records, the period of analysis shows a decrease in annual rainfall by 17.5%. In addition, water withdrawals for irrigation have contributed to a 64% decrease in monthly stream discharge during the dry season. As a consequence of the decrease in annual rainfall and water withdrawals for irrigation, the sediment transport capacity has also decreased by 10.5%.The changes in morphological driving variables (stream flows and sediment transport regimes) have manifested themselves in morphological changes, where it was possible to establish that a change in the channel form occurred in the last 15 years, going from a river with a single channel to a braided one. An important vegetation establishment has accompanied this morphological change on both riverbanks and the central bars. The colonizing vegetation corresponds to fast‐growing non‐native species (Salix spp., Populus spp. and Alnus spp). A stabilization of the channel form is expected, consolidating itself as a braided section with alternating vegetated bars.

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Performance evaluation, error decomposition and Tree-based Machine Learning error correction of GPM IMERG and TRMM 3B42 products in the Three Gorges Reservoir Area

Lin

Peng

et al. 2022

Atmospheric Research

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Evaluation of products 3B42 v7 and 3IMERG for the hydroclimatic regions of Chile

Cited by 4 publications

References 32 publications

Assessment of the IMERG Early-Run Precipitation Estimates over South American Country of Chile

Assessment of the IMERG Early-Run Precipitation Estimates over South American Country of Chile

Synergistic process interactions and morphological change in a river reach subject to multiple disturbances, the Laja River, Chile

Performance evaluation, error decomposition and Tree-based Machine Learning error correction of GPM IMERG and TRMM 3B42 products in the Three Gorges Reservoir Area

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