Tendencia en el siglo XXI del Índice de Diferencias Normalizadas de Vegetación (NDVI) en la parte sur de la península de Baja California

Salinas-Zavala, César Augusto; Martínez‐Rincón, Raúl O.; Morales-Zárate, María V.

doi:10.14350/rig.57214

Cited by 6 publications

(5 citation statements)

References 19 publications

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“…The main feature found to affect the annual variability of the wind field in the region is the displacement during winter and summer (frequency~6 months) of the North Pacific High-Pressure Center (NPHPC), located approximately at 32 • N-140 • W [51,52]. The findings using spectral analysis suggest that the influence of the NPHPC on dust emission flux and the hydrometeorological variables is intense not only in the Pacific Ocean decreasing toward the coast, as reported by Castro and Martinez [50], but also in Vizcaíno, being weaker in San Felipe, as reported by Salinas-Zavala et al [24]. The above suggests that the climate conditions in Vizcaino are better suited for promoting dust events relative to San Felipe.…”

Section: Discussionmentioning

confidence: 71%

“…Given the importance of moisture and dust transport in the desert, studies on the circulation of wind in the BCP have focused mainly on the summer. These show that surface wind responds to: (1) The thermal contrast between the Pacific Ocean (PO) and the GC [21,26,28,29], (2) orography of the BCP [21,26,[30][31][32], the difference in surface air temperature between the margins of the BCP (peninsular PO margin and GC) [21], and the high-pressure belt in the northern hemisphere [24].…”

Section: Climatementioning

confidence: 99%

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The Baja California Peninsula, a Significant Source of Dust in Northwest Mexico

et al. 2019

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Despite their impacts on ecosystems, climate, and human health, atmospheric emissions of mineral dust from deserts have been scarcely studied. This work estimated dust emission flux (E) between 1979 and 2014 from two desert regions in the Baja California Peninsula (BCP) using a modified dust parameterization scheme. Subsequently, we evaluated the processes controlling the variability of E at intra- and interannual scales. During the period 1979–2014 peak E were generally recorded in summer (San Felipe) and spring (Vizcaino), and the lowest emissions occurred in autumn (San Felipe) and winter (Vizcaíno). Intra- and interannual variability in E was associated with fluctuations in wind speed and direction, precipitation, and soil moisture, which, in turn, were controlled by the seasonal displacement of the North Pacific high-pressure center. Key drivers of the interannual variability of E are strong El Niño Southern Oscillation (ENSO) events. These climatic events and the hydrometeorological variables mentioned above played a major role in the onset and occurrence of dust events, with the highest annual emissions at Vizcaíno. Besides, a lag of 19 months (San Felipe) and 21 months (Vizcaino) was recorded between the occurrence of relevant E and ENSO events, apparently in response to the effect of this climatic event on precipitation. The climate variability of E in both desert regions was evidenced by the positive trends associated with increases in wind speed and air temperature, and with decreases in precipitation and soil moisture. Finally, our findings suggest that the BCP should be considered as a significant source of dust for the regional inventory of particulate matter emissions from the Earth’s surface.

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Section: Discussionmentioning

confidence: 71%

Section: Climatementioning

confidence: 99%

The Baja California Peninsula, a Significant Source of Dust in Northwest Mexico

et al. 2019

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“…We quantified the land use and vegetation cover using the supervised classification of satellite images using the machine learning regression algorithm (MLR) with a p-value of 0.8814 and kappa index of 0.783 (Lansat8 OLI TIRS from the USGS platform) [34,35]). The normalized difference vegetation index (NDVI) [21,36] was applied to discover the state of the vegetation surrounding the river, and the erosion index (E), through the universal soil loss equation [37], was used to determine the degree of erosivity. Finally, data regarding the main productive activities in the municipalities was obtained from the National Institute of Statistical and Geography municipal records [38].…”

Section: Hydrogeomorphological Characteristics and Indicesmentioning

confidence: 99%

Biotic Integrity, Water Quality, and Landscape Characteristics of a Subtropical River

Gudiño-Sosa

Moncayo‐Estrada

Velázquez-Machuca

et al. 2023

Water

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The integrity of rivers is affected by anthropogenic activities at different spatial scales, from basin and landscape levels to the direct effects on the river and aquatic life. Our objective was to study these effects on the subtropical La Pasión River, analyzing environmental, geomorphological, habitat and water quality, and macroinvertebrates. We sampled the dry season (March 2022) because the river presented stable conditions. We selected the most influential variables in each spatial scale and determined their relationship with the indexes of quality characteristics and aquatic life in the river using multivariate statistics. Most sites (≈65%) had medium water and suboptimal habitat quality status, meanwhile half the sites had regular biotic integrity status; without finding coincidence in the quality of the different indexes applied, all sites indicated a high gradient of degradation from the origin to the mouth of the river. The presence of some families (e.g., Culicidae, Chironomidae, Lumbriculidae) indicated organic matter contamination. The main variables that significantly classified the river quality and integrity structure were water flow, turbidity, habitat embeddedness, and sulfates (χ2 = 0.1145, p < 0.01). It is concluded that the affected sites received wastewater without prior treatment and presented physical barriers such as irrigation channels.

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“…Los valores de reflectancia bidireccional de la superficie para las bandas del infrarrojo cercano y rojo, que son las bandas B2 y B1 de la imagen. (Salinas, Octavio, Martínez, y Morales, 2017).…”

Section: Figura 1 Ubicación De Las Comunidades En El Cantón Guanounclassified

“…Dónde: es el promedio de NDVI de las parcelas de cada comunidad, corresponde al NDVI de cada parcela que se encuentra dentro de la comunidad, y es el número de parcelas de la comunidad. (Salinas et al, 2017). En esta investigación se utilizó las bandas 8 y 4, obteniendo la ecuación:…”

Section: Figura 1 Ubicación De Las Comunidades En El Cantón Guanounclassified

Estudio multiespectral del cultivo de tuna para determinar los índices NDVI , CWSI y SAVI , a partir de imágenes SENTINEL 2A, en el cantón Guano, provincia de Chimborazo, Ecuador

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Erazo

2019

Enfoque UTE

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En este trabajo se evalúan: el Índice de Vegetación Diferencial Normalizado (NDVI, por sus siglas en inglés), el Índice de Vegetación Ajustado al Suelo (SAVI, por sus siglas en inglés) y el Índice de estrés hídrico (CWSI, por sus siglas en inglés) en los cultivos de tuna, ubicados en el cantón Guano de la provincia de Chimborazo, Ecuador. El área de interés (AOI, por sus siglas en inglés) son las parroquias San Andrés y Guano, en las cuales se determinó la textura del suelo con los datos existentes en el Sistema Nacional de Información (SNI) del Ecuador, para ello se utilizó una imagen satelital de Sentinel 2A del 16 de junio de 2018; y mediante operaciones de funciones raster se obtuvo una media aproximada y referencial de NDVI, la reflectancia recibida tanto del suelo como del cultivo de tuna (SAVI) y la transpiración que corresponde al estrés hídrico (CSWI) de las parcelas de tuna. Finalmente, se obtuvieron datos aproximados y referenciales de NDVI con un valor de 0.31, valores de SAVI que reflejan datos del suelo y del cultivo y un CWSI muy bajo que determinan que la transpiración es mínima, por lo que se puede concluir que una de las posibles técnicas más adecuadas para incrementar la producción de la tuna es la de riego por goteo.

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Tendencia en el siglo XXI del Índice de Diferencias Normalizadas de Vegetación (NDVI) en la parte sur de la península de Baja California

Cited by 6 publications

References 19 publications

The Baja California Peninsula, a Significant Source of Dust in Northwest Mexico

The Baja California Peninsula, a Significant Source of Dust in Northwest Mexico

Biotic Integrity, Water Quality, and Landscape Characteristics of a Subtropical River

Estudio multiespectral del cultivo de tuna para determinar los índices NDVI , CWSI y SAVI , a partir de imágenes SENTINEL 2A, en el cantón Guano, provincia de Chimborazo, Ecuador

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