5 research outputs found
Variation of Hydrometeorological Conditions along a Topographic Transect in Northwestern Mexico during the North American Monsoon
Clonal chromosomal mosaicism and loss of chromosome Y in elderly men increase vulnerability for SARS-CoV-2
The pandemic caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2, COVID-19) had an estimated overall case fatality ratio of 1.38% (pre-vaccination), being 53% higher in males and increasing exponentially with age. Among 9578 individuals diagnosed with COVID-19 in the SCOURGE study, we found 133 cases (1.42%) with detectable clonal mosaicism for chromosome alterations (mCA) and 226 males (5.08%) with acquired loss of chromosome Y (LOY). Individuals with clonal mosaic events (mCA and/or LOY) showed a 54% increase in the risk of COVID-19 lethality. LOY is associated with transcriptomic biomarkers of immune dysfunction, pro-coagulation activity and cardiovascular risk. Interferon-induced genes involved in the initial immune response to SARS-CoV-2 are also down-regulated in LOY. Thus, mCA and LOY underlie at least part of the sex-biased severity and mortality of COVID-19 in aging patients. Given its potential therapeutic and prognostic relevance, evaluation of clonal mosaicism should be implemented as biomarker of COVID-19 severity in elderly people. Among 9578 individuals diagnosed with COVID-19 in the SCOURGE study, individuals with clonal mosaic events (clonal mosaicism for chromosome alterations and/or loss of chromosome Y) showed an increased risk of COVID-19 lethality
Navopatía Normalized Difference Vegetation Indices
Objective:
The objective of this database is to identify the phenological seasonality of the mangrove along the southern coast of the state of Sonora, in northwestern Mexico. Especially with the use of the Normalized Difference Vegetation Index (NDVI) obtained from satellite information. This dataset is part of a larger project entitled "Environmental Controls on the temporal evolution of Energy and CO2 fluxes on an Arid Mangrove of Northwestern Mexico". Both the project are managed by the Instituto Tecnológico de Sonora (ITSON) and funded by the National Laboratory of Coastal Resilience (LANRESC) and the National Council of Science and Technology (CONACYT).
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Study site
The study site is found at the coastal intertidal zone of the northern edge of Mazocarit Island, approximately 400 meters east of the Navopatia Field Station, both located in northwestern state of Sonora, México. The site is characterized by the presence of two dominant species of mangroves (Avicennia germinans and Rhizophora mangle) rooted on salt-silt-clayey sediments. The Mazocarit Island is found within the coastal lagoon system known as the Agiabampo-Bacorehuis-Rio Fuerte system encompassing an area of 90,804 ha in the boundaries of the Mexican States of Sonora and Sinaloa. The navopatia meteorological station is in the northern tip of the Mazocarit Island characterized by the presence of red mangrove (Rhizophora mangle) with the following location:
UTM Coordinate system
Easting: 675582.80 Northing: 2921170.99, UTM zone: 12 N, Datum: WGS84
Geographic location:
Latitude: 26.3999, Longitude: -109.2397, Datum: WGS84
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Data:
Normalized Difference Vegetation Index (NDVI) was generated from band 4 (664.5 nm) and band 8 (NIR, 835.1 nm) of Sentinel -2 MSI (MultiSpectral Instrument, Level-1C) as part of the COPERNICUS / S2_SR data collection. Image processing and time series extraction with Google Earth Engine (GEE, https://earthengine.google.com). A total of 104 low-cloud cover (< 5 % cloud cover) images were processed to generate the NDVI time series by type of mangrove. In addition, data contamination was eliminated using the method of moving averages with 12 days. The NDVI data were extracted from two different regions of interest (ROI) defined by the dominant mangrove species that covers the surface
Variation of Hydrometeorological Conditions Along a Topographic Transect in Northwestern Mexico During the North American Monsoon
Relatively little is currently known about the spatiotemporal variability of land surface conditions duringthe North American monsoon, in particular for regions of complex topography. As a result, the role playedby land–atmosphere interactions in generating convective rainfall over steep terrain and sustaining monsoonconditions is still poorly understood. In this study, the variation of hydrometeorological conditionsalong a large-scale topographic transect in northwestern Mexico is described. The transect field experimentconsisted of daily sampling at 30 sites selected to represent variations in elevation and ecosystem distribution.Simultaneous soil and atmospheric variables were measured during a 2-week period in early August 2004. Transect observations were supplemented by a network of continuous sampling sites used to analyzethe regional hydrometeorological conditions prior to and during the field experiment. Results reveal thestrong control exerted by topography on the spatial and temporal variability in soil moisture, with distinctlandscape regions experiencing different hydrologic regimes. Reduced variations at the plot and transectscale during a drydown period indicate that homogenization of hydrologic conditions occurred over thelandscape. Furthermore, atmospheric variables are clearly linked to surface conditions, indicating thatheating and moistening of the boundary layer closely follow spatial and temporal changes in hydrologicproperties. Land–atmosphere interactions at the basin scale (100 km2), obtained via a technique accountingfor topographic variability, further reveal the role played by the land surface in sustaining high atmosphericmoisture conditions, with implications toward rainfall generation during the North American monsoon